HTML5 & JavaScript

Week 11

DOM Nodes

document

<html>

<head>

<body>

<title>

<link>

Hotel Home

Page

<h1>

<div>

Rooms Available

<p>

<h3>

Rooms:

<em>

Note the following...

15

  • Entire document is a document node
  • HTML elements are element nodes
  • Text inside HTML elements are text nodes

document node

element node

text node

DOM Nodes

  • Entire document is a document node
  • HTML elements are element nodes
  • Text inside HTML elements are text nodes

document node

element node

text node

  • As seen already, all nodes in the tree can be accessed by javascript
  • After accessing a node, we can read or modify its content (style, text, attributes

DOM Nodes

  • Entire document is a document node
  • HTML elements are element nodes
  • Text inside HTML elements are text nodes

document node

element node

text node

  • We can also add new nodes to the document using javascript

DOM Node Relationships

element node

<html>

element node

<head>

element node

<body>

<html>

  <head>
      <title>DOM Tutorial</title>
  </head>

  <body>
      <h1>DOM Lesson one</h1>
      <p>Hello world!</p>
  </body>

</html>

Relationship Types:

  • Parent
  • Child
  • Sibling

DOM Node Relationships

element node

<html>

element node

<head>

element node

<body>

<html>

  <head>
      <title>DOM Tutorial</title>
  </head>

  <body>
      <h1>DOM Lesson one</h1>
      <p>Hello world!</p>
  </body>

</html>

Relationship Types:

  • Parent
  • Child
  • Sibling

Parent

Parent

DOM Node Relationships

element node

<html>

element node

<head>

element node

<body>

<html>

  <head>
      <title>DOM Tutorial</title>
  </head>

  <body>
      <h1>DOM Lesson one</h1>
      <p>Hello world!</p>
  </body>

</html>

Relationship Types:

  • Parent
  • Child
  • Sibling
parentNode
parentNode

DOM Node Relationships

element node

<html>

element node

<head>

element node

<body>

<html>

  <head>
      <title>DOM Tutorial</title>
  </head>

  <body>
      <h1>DOM Lesson one</h1>
      <p>Hello world!</p>
  </body>

</html>

Relationship Types:

  • Parent
  • Child
  • Sibling

Child

Child

DOM Node Relationships

element node

<html>

element node

<head>

element node

<body>

<html>

  <head>
      <title>DOM Tutorial</title>
  </head>

  <body>
      <h1>DOM Lesson one</h1>
      <p>Hello world!</p>
  </body>

</html>

Relationship Types:

  • Parent
  • Child
  • Sibling
firstChild
lastChild

DOM Node Relationships

element node

<html>

element node

<head>

element node

<body>

<html>

  <head>
      <title>DOM Tutorial</title>
  </head>

  <body>
      <h1>DOM Lesson one</h1>
      <p>Hello world!</p>
  </body>

</html>

Relationship Types:

  • Parent
  • Child
  • Sibling

Set of Children

DOM Node Relationships

element node

<html>

element node

<head>

element node

<body>

<html>

  <head>
      <title>DOM Tutorial</title>
  </head>

  <body>
      <h1>DOM Lesson one</h1>
      <p>Hello world!</p>
  </body>

</html>

Relationship Types:

  • Parent
  • Child
  • Sibling
children
children[0]
children[1]

DOM Node Relationships

element node

<html>

element node

<head>

element node

<body>

<html>

  <head>
      <title>DOM Tutorial</title>
  </head>

  <body>
      <h1>DOM Lesson one</h1>
      <p>Hello world!</p>
  </body>

</html>

Relationship Types:

  • Parent
  • Child
  • Sibling

Sibling

Sibling

DOM Node Relationships

element node

<html>

element node

<head>

element node

<body>

<html>

  <head>
      <title>DOM Tutorial</title>
  </head>

  <body>
      <h1>DOM Lesson one</h1>
      <p>Hello world!</p>
  </body>

</html>

Relationship Types:

  • Parent
  • Child
  • Sibling
nextSibling
previousSibling

DOM Node Relationships

<html>

  <head>
      <title>DOM Tutorial</title>
  </head>

  <body>
      <h1>DOM Lesson one</h1>
      <p>Hello world!</p>
  </body>

</html>

element node

<body>

element node

<h1>

element node

<p>

Element nodes do not contain text

"DOM Lesson one"

?

"Hello world!"

?

DOM Node Relationships

<html>

  <head>
      <title>DOM Tutorial</title>
  </head>

  <body>
      <h1>DOM Lesson one</h1>
      <p>Hello world!</p>
  </body>

</html>

element node

<body>

element node

<h1>

element node

<p>

Text stored in additional text node

text node

"DOM Lesson One"

text node

"Hello world!"

https://codepen.io/dnlkelly1/pen/rQqjWV?editors=1010#0

https://codepen.io/dnlkelly1/pen/dQgNgd

Creating New HTML Elements

  1. Create new element
  2. Append newly created element to an existing element 

Creating New HTML Elements

  1. Create new element 
var newH1Element = document.createElement("h1");
var newH3Element = document.createElement("h3");
var newDivElement = document.createElement("div");
var newPElement = document.createElement("p");

Creating New HTML Elements

1.2. Create text node

var newH1Element = document.createElement("h1");

1.1 Create basic element 

newH1Element.appendChild(textN);

1.3. Append text node to newly created element

var textN = document.createTextNode("My Heading");
  1. Create new element 

DOM Node Relationships

element node

<h1>

text node

"My Heading"

var newH1Element = document.createElement("h1");

var textN = document.createTextNode("My Heading");

newH1Element.appendChild(textN);

newH1Element

textN

Creating New HTML Elements

var element = document.querySelector("#div1");

2. Append newly created element to an existing element

2.1 Grab Existing Element

2.2 Append new element to grabbed element

element.appendChild(newH1Element);

DOM Node Relationships

element node

<h1>

text node

"My Heading"

var element = document.querySelector("#div1");

element.appendChild(newH1Element);

newH1Element

<html>

  <head>
      <title>DOM Tutorial</title>
  </head>

  <body>
      <div id="div1">
        <h1>Already Existed</h1>
      </div>
  </body>

</html>

element node

<div>

text node

"Already Existed"

element node

<h1>

element

<html>

  <head>
      <title>DOM Tutorial</title>
  </head>

  <body>
      <div id="div1">
        <h1>Already Existed</h1>
        <h1>My Heading</h1>
      </div>
  </body>

</html>

https://codepen.io/dnlkelly1/pen/JemNJg?editors=1010#0

Removing HTML Elements

  1. Get access to the parent of the element you want to remove
  2. Get access to the specific element you want to remove
  3. Request that parent removes the specific child element

Removing HTML Elements

<div id="div1">
    <p id="p1">This is a paragraph.</p>
    <p id="p2">This is another paragraph.</p>
</div>
//1.
var parent = document.getElementById("div1");

//2.
var child = document.getElementById("p1");

//3.
parent.removeChild(child);
  1. Get access to the parent of the element you want to remove
  2. Get access to the specific element you want to remove
  3. Request that parent removes the specific child element

https://codepen.io/dnlkelly1/pen/KKgpBRz

https://codepen.io/dnlkelly1/pen/OaBjye?editors=1010#0

<!DOCTYPE html>
<html lang="en">
<head>
	<meta charset="UTF-8">
	<title>Simple JavaScript Todo</title>
	<link rel="stylesheet" type="text/css" href="todo2.css">
</head>
<body>
      <div class="wrapper"> 

      	<h1>Todo App:</h1>
          
        <div id="inputarea">
          <input type="text" id="text" placeholder="Add stuff..">
          <button id="add">Add</button>
          <button id="removeAll">Remove all</button>
        </div>

        <div class="border">
          
          

          <ul id="list"></ul>

       </div>
     </div>

     <script type="text/javascript" src="todo2.js"></script>
</body>
</html>

Sample ToDo List App:

<!DOCTYPE html>
<html lang="en">
<head>
	<meta charset="UTF-8">
	<title>Simple JavaScript Todo</title>
	<link rel="stylesheet" type="text/css" href="todo2.css">
</head>
<body>
      <div class="wrapper"> 

      	<h1>Todo App:</h1>
          
        <div id="inputarea">
          <input type="text" id="text" placeholder="Add stuff..">
          <button id="add">Add</button>
          <button id="removeAll">Remove all</button>
        </div>

        <div class="border">
          
          

          <ul id="list"></ul>

       </div>
     </div>

     <script type="text/javascript" src="todo2.js"></script>
</body>
</html>
html, body {
  padding: 0;
  margin: 0;
  width: 100%;
  background-color: #9BC1BC;
  font-family: 'Roboto', sans-serif;
}

Sample ToDo List App:

Add basic styling: background, font, width and height

<!DOCTYPE html>
<head>
	<title>Simple JavaScript Todo</title>
	<link rel="stylesheet" type="text/css" href="todo.css">
</head>
<body>
      <div class="wrapper"> 
        <div class="border">
          
          <h1>Todo App:<h1>
          
          <input type="text" id="text" placeholder="Add stuff..">
          <button id="add">Add</button>
          <button id="removeAll">Remove all</button>

          <ul id="list"></ul>

       </div>
     </div>
     
     <script type="text/javascript" src="todo.js"></script>
</body>
</html>
.wrapper {
  max-width: 900px;
  min-height: 500px;
  margin: 0 auto;
  height: 100%;
  background-color: #EAE1DF;
  border-bottom-left-radius: 15px;
  border-bottom-right-radius: 15px;
}

Sample ToDo List App:

Style the outer most div: set max-width, center it and add background color

.border {
  margin-left: 25px;
  margin-right: 25px;
  padding-bottom: 25px;
}

Sample ToDo List App:

Style the inner div: add some margin

<!DOCTYPE html>
<html lang="en">
<head>
	<meta charset="UTF-8">
	<title>Simple JavaScript Todo</title>
	<link rel="stylesheet" type="text/css" href="todo2.css">
</head>
<body>
      <div class="wrapper"> 

      	<h1>Todo App:</h1>
          
        <div id="inputarea">
          <input type="text" id="text" placeholder="Add stuff..">
          <button id="add">Add</button>
          <button id="removeAll">Remove all</button>
        </div>

        <div class="border">
          
          

          <ul id="list"></ul>

       </div>
     </div>

     <script type="text/javascript" src="todo2.js"></script>
</body>
</html>
#inputarea
{
  padding: 10px 20px 10px 20px;
  background-color: #14213D;
  border-bottom: 8px solid #FCA311;
  
}

Sample ToDo List App:

Style the inputarea div: add some color and border color

<!DOCTYPE html>
<html lang="en">
<head>
	<meta charset="UTF-8">
	<title>Simple JavaScript Todo</title>
	<link rel="stylesheet" type="text/css" href="todo2.css">
</head>
<body>
      <div class="wrapper"> 

      	<h1>Todo App:</h1>
          
        <div id="inputarea">
          <input type="text" id="text" placeholder="Add stuff..">
          <button id="add">Add</button>
          <button id="removeAll">Remove all</button>
        </div>

        <div class="border">
          
          

          <ul id="list"></ul>

       </div>
     </div>

     <script type="text/javascript" src="todo2.js"></script>
</body>
</html>
h1 {
    text-align: center;
    background-color: #FCA311;
    margin: 0px;
    padding-top: 20px;
    padding-bottom: 20px;
    text-transform: uppercase;
    font-weight: 700;
    color: #14213D;
}

Sample ToDo List App:

Style the h1: uppercase, font weight and color

<!DOCTYPE html>
<html lang="en">
<head>
	<meta charset="UTF-8">
	<title>Simple JavaScript Todo</title>
	<link rel="stylesheet" type="text/css" href="todo2.css">
</head>
<body>
      <div class="wrapper"> 

      	<h1>Todo App:</h1>
          
        <div id="inputarea">
          <input type="text" id="text" placeholder="Add stuff..">
          <button id="add">Add</button>
          <button id="removeAll">Remove all</button>
        </div>

        <div class="border">
          
          

          <ul id="list"></ul>

       </div>
     </div>

     <script type="text/javascript" src="todo2.js"></script>
</body>
</html>
input {
  padding: 10px;
  color: #212121;
  border: 1px solid #d2d2d2;
  border-radius: 2px 2px 2px 2px;
}

Sample ToDo List App:

Style the textbox

<!DOCTYPE html>
<html lang="en">
<head>
	<meta charset="UTF-8">
	<title>Simple JavaScript Todo</title>
	<link rel="stylesheet" type="text/css" href="todo2.css">
</head>
<body>
      <div class="wrapper"> 

      	<h1>Todo App:</h1>
          
        <div id="inputarea">
          <input type="text" id="text" placeholder="Add stuff..">
          <button id="add">Add</button>
          <button id="removeAll">Remove all</button>
        </div>

        <div class="border">
          
          

          <ul id="list"></ul>

       </div>
     </div>

     <script type="text/javascript" src="todo2.js"></script>
</body>
</html>
button {
  padding: 10px;
  border: 0 none;
  border-radius: 2px 2px 2px 2px;
  color: #FFFFFF;
  cursor: pointer;
  font-weight: 800;
  text-transform: uppercase;
  font-size: 12px;
}

Sample ToDo List App:

Define general button style

<!DOCTYPE html>
<html lang="en">
<head>
	<meta charset="UTF-8">
	<title>Simple JavaScript Todo</title>
	<link rel="stylesheet" type="text/css" href="todo2.css">
</head>
<body>
      <div class="wrapper"> 

      	<h1>Todo App:</h1>
          
        <div id="inputarea">
          <input type="text" id="text" placeholder="Add stuff..">
          <button id="add">Add</button>
          <button id="removeAll">Remove all</button>
        </div>

        <div class="border">
          
          

          <ul id="list"></ul>

       </div>
     </div>

     <script type="text/javascript" src="todo2.js"></script>
</body>
</html>
button#add {
  background-color: #46b98a;
}

button#add:hover {
    background-color: #3fa67c;
}

button#removeAll {
  background-color: #E0645C;
}

button#removeAll:hover {
    background-color: #c95a52;
}

Sample ToDo List App:

Define specific colors for add and remove buttons

Define specific hover colors for add and remove buttons

<!DOCTYPE html>
<html lang="en">
<head>
	<meta charset="UTF-8">
	<title>Simple JavaScript Todo</title>
	<link rel="stylesheet" type="text/css" href="todo2.css">
</head>
<body>
      <div class="wrapper"> 

      	<h1>Todo App:</h1>
          
        <div id="inputarea">
          <input type="text" id="text" placeholder="Add stuff..">
          <button id="add">Add</button>
          <button id="removeAll">Remove all</button>
        </div>

        <div class="border">
          
          

          <ul id="list"></ul>

       </div>
     </div>

     <script type="text/javascript" src="todo2.js"></script>
</body>
</html>
ul#list {
  margin: 0; 
  padding: 20px 0 0 0;

}

Sample ToDo List App:

Style the ul: set padding and no margins

<!DOCTYPE html>
<html lang="en">
<head>
	<meta charset="UTF-8">
	<title>Simple JavaScript Todo</title>
	<link rel="stylesheet" type="text/css" href="todo2.css">
</head>
<body>
      <div class="wrapper"> 

      	<h1>Todo App:</h1>
          
        <div id="inputarea">
          <input type="text" id="text" placeholder="Add stuff..">
          <button id="add">Add</button>
          <button id="removeAll">Remove all</button>
        </div>

        <div class="border">
          
          

          <ul id="list"></ul>

       </div>
     </div>

     <script type="text/javascript" src="todo2.js"></script>
</body>
</html>
var add = document.querySelector('#add');

add.addEventListener("click",addLi);


function addLi() 
{
}

Sample ToDo List App:

Create click event listen for add button

<!DOCTYPE html>
<html lang="en">
<head>
	<meta charset="UTF-8">
	<title>Simple JavaScript Todo</title>
	<link rel="stylesheet" type="text/css" href="todo2.css">
</head>
<body>
      <div class="wrapper"> 

      	<h1>Todo App:</h1>
          
        <div id="inputarea">
          <input type="text" id="text" placeholder="Add stuff..">
          <button id="add">Add</button>
          <button id="removeAll">Remove all</button>
        </div>

        <div class="border">
          
          

          <ul id="list"></ul>

       </div>
     </div>

     <script type="text/javascript" src="todo2.js"></script>
</body>
</html>
var add = document.querySelector('#add');

add.addEventListener("click",addLi);


function addLi() 
{
    var inputText = document.getElementById('text').value;
}

Sample ToDo List App:

Grab the text box value

<!DOCTYPE html>
<html lang="en">
<head>
	<meta charset="UTF-8">
	<title>Simple JavaScript Todo</title>
	<link rel="stylesheet" type="text/css" href="todo2.css">
</head>
<body>
      <div class="wrapper"> 

      	<h1>Todo App:</h1>
          
        <div id="inputarea">
          <input type="text" id="text" placeholder="Add stuff..">
          <button id="add">Add</button>
          <button id="removeAll">Remove all</button>
        </div>

        <div class="border">
          
          

          <ul id="list"></ul>

       </div>
     </div>

     <script type="text/javascript" src="todo2.js"></script>
</body>
</html>
var add = document.querySelector('#add');

add.addEventListener("click",addLi);


function addLi() 
{
    var inputText = document.getElementById('text').value;

    var li = document.createElement('li');
    var textNode = document.createTextNode(inputText + ' ');
}

Sample ToDo List App:

Create some new elements

<!DOCTYPE html>
<html lang="en">
<head>
	<meta charset="UTF-8">
	<title>Simple JavaScript Todo</title>
	<link rel="stylesheet" type="text/css" href="todo2.css">
</head>
<body>
      <div class="wrapper"> 

      	<h1>Todo App:</h1>
          
        <div id="inputarea">
          <input type="text" id="text" placeholder="Add stuff..">
          <button id="add">Add</button>
          <button id="removeAll">Remove all</button>
        </div>

        <div class="border">
          
          

          <ul id="list"></ul>

       </div>
     </div>

     <script type="text/javascript" src="todo2.js"></script>
</body>
</html>
var add = document.querySelector('#add');

add.addEventListener("click",addLi);


function addLi() 
{
    var inputText = document.getElementById('text').value;

    var li = document.createElement('li');
    var textNode = document.createTextNode(inputText + ' ');
    
    li.appendChild(textNode);
}

Sample ToDo List App:

Add the text to the li

<!DOCTYPE html>
<html lang="en">
<head>
	<meta charset="UTF-8">
	<title>Simple JavaScript Todo</title>
	<link rel="stylesheet" type="text/css" href="todo2.css">
</head>
<body>
      <div class="wrapper"> 

      	<h1>Todo App:</h1>
          
        <div id="inputarea">
          <input type="text" id="text" placeholder="Add stuff..">
          <button id="add">Add</button>
          <button id="removeAll">Remove all</button>
        </div>

        <div class="border">
          
          

          <ul id="list"></ul>

       </div>
     </div>

     <script type="text/javascript" src="todo2.js"></script>
</body>
</html>
var add = document.querySelector('#add');

add.addEventListener("click",addLi);


function addLi() 
{
    var inputText = document.getElementById('text').value;

    var li = document.createElement('li');
    var textNode = document.createTextNode(inputText + ' ');
    
    li.appendChild(textNode);

    var ul = document.querySelector('#list');
    ul.appendChild(li);
}

Sample ToDo List App:

Add the li to the ul

<!DOCTYPE html>
<html lang="en">
<head>
	<meta charset="UTF-8">
	<title>Simple JavaScript Todo</title>
	<link rel="stylesheet" type="text/css" href="todo2.css">
</head>
<body>
      <div class="wrapper"> 

      	<h1>Todo App:</h1>
          
        <div id="inputarea">
          <input type="text" id="text" placeholder="Add stuff..">
          <button id="add">Add</button>
          <button id="removeAll">Remove all</button>
        </div>

        <div class="border">
          
          

          <ul id="list"></ul>

       </div>
     </div>

     <script type="text/javascript" src="todo2.js"></script>
</body>
</html>
var add = document.querySelector('#add');

add.addEventListener("click",addLi);


function addLi() 
{
    var inputText = document.getElementById('text').value;

    var li = document.createElement('li');
    var textNode = document.createTextNode(inputText + ' ');

    var removeButton = document.createElement('button');//<---add this

    li.appendChild(textNode);
    li.appendChild(removeButton);//<---add this

    var ul = document.querySelector('#list');
    ul.appendChild(li);
}

Sample ToDo List App:

Add a button the the li also

<!DOCTYPE html>
<html lang="en">
<head>
	<meta charset="UTF-8">
	<title>Simple JavaScript Todo</title>
	<link rel="stylesheet" type="text/css" href="todo2.css">
</head>
<body>
      <div class="wrapper"> 

      	<h1>Todo App:</h1>
          
        <div id="inputarea">
          <input type="text" id="text" placeholder="Add stuff..">
          <button id="add">Add</button>
          <button id="removeAll">Remove all</button>
        </div>

        <div class="border">
          
          

          <ul id="list"></ul>

       </div>
     </div>

     <script type="text/javascript" src="todo2.js"></script>
</body>
</html>
var add = document.querySelector('#add');

add.addEventListener("click",addLi);


function addLi() 
{
    var inputText = document.getElementById('text').value;

    var li = document.createElement('li');
    var textNode = document.createTextNode(inputText + ' ');

    var removeButton = document.createElement('button');
    removeButton.classList.add('removeMe');//<---add this

    li.appendChild(textNode);
    li.appendChild(removeButton);

    

    var ul = document.querySelector('#list');
    ul.appendChild(li);
}

Sample ToDo List App:

Style the button by adding the "removeMe" class

<!DOCTYPE html>
<html lang="en">
<head>
	<meta charset="UTF-8">
	<title>Simple JavaScript Todo</title>
	<link rel="stylesheet" type="text/css" href="todo2.css">
</head>
<body>
      <div class="wrapper"> 

      	<h1>Todo App:</h1>
          
        <div id="inputarea">
          <input type="text" id="text" placeholder="Add stuff..">
          <button id="add">Add</button>
          <button id="removeAll">Remove all</button>
        </div>

        <div class="border">
          
          

          <ul id="list"></ul>

       </div>
     </div>

     <script type="text/javascript" src="todo2.js"></script>
</body>
</html>
var add = document.querySelector('#add');

add.addEventListener("click",addLi);


function addLi() 
{
    var inputText = document.getElementById('text').value;

    var li = document.createElement('li');
    var textNode = document.createTextNode(inputText + ' ');

    var removeButton = document.createElement('button');
    removeButton.classList.add('removeMe');

    var checkbox = document.createElement('input');//<---add this
    checkbox.type = "checkbox";//<---add this
    checkbox.id = "cb";//<---add this

    li.appendChild(checkbox);//<---add this
    li.appendChild(textNode);
    li.appendChild(removeButton);

    

    var ul = document.querySelector('#list');
    ul.appendChild(li);
}

Sample ToDo List App:

Add a checkbox to the li also

<!DOCTYPE html>
<html lang="en">
<head>
	<meta charset="UTF-8">
	<title>Simple JavaScript Todo</title>
	<link rel="stylesheet" type="text/css" href="todo2.css">
</head>
<body>
      <div class="wrapper"> 

      	<h1>Todo App:</h1>
          
        <div id="inputarea">
          <input type="text" id="text" placeholder="Add stuff..">
          <button id="add">Add</button>
          <button id="removeAll">Remove all</button>
        </div>

        <div class="border">
          
          

          <ul id="list"></ul>

       </div>
     </div>

     <script type="text/javascript" src="todo2.js"></script>
</body>
</html>
var add = document.querySelector('#add');

add.addEventListener("click",addLi);


function addLi() 
{
    var inputText = document.getElementById('text').value;

    if(inputText.length > 0)
    {
    	var li = document.createElement('li');
    	var textNode = document.createTextNode(inputText + ' ');

    	var removeButton = document.createElement('button');
    	removeButton.classList.add('removeMe');
    	removeButton.textContent = "X";

    	var checkbox = document.createElement('input');
    	checkbox.type = "checkbox";
    	checkbox.id = "cb";

    	li.appendChild(checkbox);
    	li.appendChild(textNode);
    	li.appendChild(removeButton);

    	var ul = document.querySelector('#list');
    	ul.appendChild(li);
    }
}

Sample ToDo List App:

Add some error handling - Ensure something has actually been entered in the text box before adding an li

<!DOCTYPE html>
<html lang="en">
<head>
	<meta charset="UTF-8">
	<title>Simple JavaScript Todo</title>
	<link rel="stylesheet" type="text/css" href="todo2.css">
</head>
<body>
      <div class="wrapper"> 

      	<h1>Todo App:</h1>
          
        <div id="inputarea">
          <input type="text" id="text" placeholder="Add stuff..">
          <button id="add">Add</button>
          <button id="removeAll">Remove all</button>
        </div>

        <div class="border">
          
          

          <ul id="list"></ul>

       </div>
     </div>

     <script type="text/javascript" src="todo2.js"></script>
</body>
</html>

Sample ToDo List App:

Style the lis that are added now:

Remove bullet point, change font size, add border, set height

li {
  list-style: none;
  font-size: 22px;
  padding: 5px;
  border: 1px #D3D3D3 solid;
  border-radius: 2px;
  min-height: 25px;
  margin-top: 2px;
  background-color: #fff;
}

li:hover
{
  box-shadow: 0px 0px 8px 2px rgba(0,0,0,0.55);
}
<!DOCTYPE html>
<html lang="en">
<head>
	<meta charset="UTF-8">
	<title>Simple JavaScript Todo</title>
	<link rel="stylesheet" type="text/css" href="todo2.css">
</head>
<body>
      <div class="wrapper"> 

      	<h1>Todo App:</h1>
          
        <div id="inputarea">
          <input type="text" id="text" placeholder="Add stuff..">
          <button id="add">Add</button>
          <button id="removeAll">Remove all</button>
        </div>

        <div class="border">
          
          

          <ul id="list"></ul>

       </div>
     </div>

     <script type="text/javascript" src="todo2.js"></script>
</body>
</html>

Sample ToDo List App:

Style the button in the lis

 

button.removeMe {
  padding: 5px;
  font-size: 13px;
  margin-left: 10px;
  font-weight: 700;
  float: right;
  padding-left: 10px;
  padding-right: 10px;
}

button.removeMe:hover {
  background-color: #E0645C;
}
<!DOCTYPE html>
<html lang="en">
<head>
	<meta charset="UTF-8">
	<title>Simple JavaScript Todo</title>
	<link rel="stylesheet" type="text/css" href="todo2.css">
</head>
<body>
      <div class="wrapper"> 

      	<h1>Todo App:</h1>
          
        <div id="inputarea">
          <input type="text" id="text" placeholder="Add stuff..">
          <button id="add">Add</button>
          <button id="removeAll">Remove all</button>
        </div>

        <div class="border">
          
          

          <ul id="list"></ul>

       </div>
     </div>

     <script type="text/javascript" src="todo2.js"></script>
</body>
</html>
var add = document.querySelector('#add');

add.addEventListener("click",addLi);


function addLi() 
{
    var inputText = document.getElementById('text').value;

    if(inputText.length > 0)
    {
    	var li = document.createElement('li');
    	var textNode = document.createTextNode(inputText + ' ');

    	var removeButton = document.createElement('button');
    	removeButton.classList.add('removeMe');
    	removeButton.textContent = "X";

        removeButton.addEventListener("click",removeMe);//<--add this

    	var checkbox = document.createElement('input');
    	checkbox.type = "checkbox";
    	checkbox.id = "cb";

    	li.appendChild(checkbox);
    	li.appendChild(textNode);
    	li.appendChild(removeButton);

    	var ul = document.querySelector('#list');
    	ul.appendChild(li);
    }
}

function removeMe()
{
    
}

Sample ToDo List App:

Add an event handler to each removeMe button

<!DOCTYPE html>
<html lang="en">
<head>
	<meta charset="UTF-8">
	<title>Simple JavaScript Todo</title>
	<link rel="stylesheet" type="text/css" href="todo2.css">
</head>
<body>
      <div class="wrapper"> 

      	<h1>Todo App:</h1>
          
        <div id="inputarea">
          <input type="text" id="text" placeholder="Add stuff..">
          <button id="add">Add</button>
          <button id="removeAll">Remove all</button>
        </div>

        <div class="border">
          
          

          <ul id="list"></ul>

       </div>
     </div>

     <script type="text/javascript" src="todo2.js"></script>
</body>
</html>
//..



function removeMe()
{
    //"this" is equivlent to the button that was clicked
    var li_item = this.parentElement;
    var ul_item = li_item.parentElement;

    ul_item.removeChild(li_item);
}

Sample ToDo List App:

Add event handler code to remove li item

<!DOCTYPE html>
<html lang="en">
<head>
	<meta charset="UTF-8">
	<title>Simple JavaScript Todo</title>
	<link rel="stylesheet" type="text/css" href="todo2.css">
</head>
<body>
      <div class="wrapper"> 

      	<h1>Todo App:</h1>
          
        <div id="inputarea">
          <input type="text" id="text" placeholder="Add stuff..">
          <button id="add">Add</button>
          <button id="removeAll">Remove all</button>
        </div>

        <div class="border">
          
          

          <ul id="list"></ul>

       </div>
     </div>

     <script type="text/javascript" src="todo2.js"></script>
</body>
</html>
//..

function addLi() 
{
    var inputText = document.getElementById('text').value;

    if(inputText.length > 0)
    {
    	var li = document.createElement('li');
    	var textNode = document.createTextNode(inputText + ' ');
  		

    	var removeButton = document.createElement('button');
    	removeButton.classList.add('removeMe');
    	removeButton.textContent = "X";

    	removeButton.addEventListener("click",removeMe);

    	var checkbox = document.createElement('input');
    	checkbox.type = "checkbox";
    	checkbox.id = "cb";

    	checkbox.addEventListener("change",checked);//<--add this

    	li.appendChild(checkbox);
    	li.appendChild(textNode);
    	li.appendChild(removeButton);

    	var ul = document.querySelector('#list');
    	ul.appendChild(li);
	}
}

function checked()//<---add this
{

}

Sample ToDo List App:

Add "change" event handler to the checkbox

<!DOCTYPE html>
<html lang="en">
<head>
	<meta charset="UTF-8">
	<title>Simple JavaScript Todo</title>
	<link rel="stylesheet" type="text/css" href="todo2.css">
</head>
<body>
      <div class="wrapper"> 

      	<h1>Todo App:</h1>
          
        <div id="inputarea">
          <input type="text" id="text" placeholder="Add stuff..">
          <button id="add">Add</button>
          <button id="removeAll">Remove all</button>
        </div>

        <div class="border">
          
          

          <ul id="list"></ul>

       </div>
     </div>

     <script type="text/javascript" src="todo2.js"></script>
</body>
</html>

Sample ToDo List App:

.selected
{
  text-decoration: line-through;
  color: #D7D7D7;
  background-color: rgba(255,255,255,0.6) ;
}

Add css selected class

//..

function checked()
{
    //"this" is equivalent to the checkbox that changed
    var li_item = this.parentElement;

    li_item.classList.toggle("selected");
}

Sample ToDo List App:

Toggle the "selected" when the checkbox changes

<!DOCTYPE html>
<html lang="en">
<head>
	<meta charset="UTF-8">
	<title>Simple JavaScript Todo</title>
	<link rel="stylesheet" type="text/css" href="todo2.css">
</head>
<body>
      <div class="wrapper"> 

      	<h1>Todo App:</h1>
          
        <div id="inputarea">
          <input type="text" id="text" placeholder="Add stuff..">
          <button id="add">Add</button>
          <button id="removeAll">Remove all</button>
        </div>

        <div class="border">
          
          

          <ul id="list"></ul>

       </div>
     </div>

     <script type="text/javascript" src="todo2.js"></script>
</body>
</html>
//..

var removeAll = document.querySelector('#removeAll');

removeAll.addEventListener("click",reset);

function reset()
{
}

Sample ToDo List App:

Set up the Remove All Button

  • Add event listener
  • Remove all li elements
<!DOCTYPE html>
<html lang="en">
<head>
	<meta charset="UTF-8">
	<title>Simple JavaScript Todo</title>
	<link rel="stylesheet" type="text/css" href="todo2.css">
</head>
<body>
      <div class="wrapper"> 

      	<h1>Todo App:</h1>
          
        <div id="inputarea">
          <input type="text" id="text" placeholder="Add stuff..">
          <button id="add">Add</button>
          <button id="removeAll">Remove all</button>
        </div>

        <div class="border">
          
          

          <ul id="list"></ul>

       </div>
     </div>

     <script type="text/javascript" src="todo2.js"></script>
</body>
</html>
//..

var removeAll = document.querySelector('#removeAll');

removeAll.addEventListener("click",reset);

function reset()
{
  	var ul = document.querySelector('#list');
	ul.innerHTML = '';
}

Sample ToDo List App:

Set up the Remove All Button

  • Add event listener
  • Remove all li elements
<!DOCTYPE html>
<html lang="en">
<head>
	<meta charset="UTF-8">
	<title>Simple JavaScript Todo</title>
	<link rel="stylesheet" type="text/css" href="todo2.css">
</head>
<body>
      <div class="wrapper"> 

      	<h1>Todo App:</h1>
          
        <div id="inputarea">
          <input type="text" id="text" placeholder="Add stuff..">
          <button id="add">Add</button>
          <button id="removeAll">Remove all</button>
        </div>

        <div class="border">
          
          

          <ul id="list"></ul>

       </div>
     </div>

     <script type="text/javascript" src="todo2.js"></script>
</body>
</html>
//..

function loadItem(text)
{
    var li = document.createElement('li');
    var textNode = document.createTextNode(text + ' ');
  		

    var removeButton = document.createElement('button');
    removeButton.classList.add('removeMe');
    removeButton.textContent = "X";

    removeButton.addEventListener("click",removeMe);

    var checkbox = document.createElement('input');
    checkbox.type = "checkbox";
    checkbox.id = "cb";

    checkbox.addEventListener("change",checked)

    li.appendChild(checkbox);
    li.appendChild(textNode);
    li.appendChild(removeButton);

    var ul = document.querySelector('#list');
    ul.appendChild(li);

    var numberOfitems = ul.children.length;

}

Sample ToDo List App:

Tidy Up a little

  • Move core part of addLi() code into seperate loadItem() function
<!DOCTYPE html>
<html lang="en">
<head>
	<meta charset="UTF-8">
	<title>Simple JavaScript Todo</title>
	<link rel="stylesheet" type="text/css" href="todo2.css">
</head>
<body>
      <div class="wrapper"> 

      	<h1>Todo App:</h1>
          
        <div id="inputarea">
          <input type="text" id="text" placeholder="Add stuff..">
          <button id="add">Add</button>
          <button id="removeAll">Remove all</button>
        </div>

        <div class="border">
          
          

          <ul id="list"></ul>

       </div>
     </div>

     <script type="text/javascript" src="todo2.js"></script>
</body>
</html>
//..

function addLi() 
{
    var inputText = document.getElementById('text').value;

    if(inputText.length > 0)
    {
    	loadItem(inputText);
    }
}

Sample ToDo List App:

Tidy Up a little

  • Edit addLi() to call loadItem() function
<!DOCTYPE html>
<html lang="en">
<head>
	<meta charset="UTF-8">
	<title>Simple JavaScript Todo</title>
	<link rel="stylesheet" type="text/css" href="todo2.css">
</head>
<body>
      <div class="wrapper"> 

      	<h1>Todo App:</h1>
          
        <div id="inputarea">
          <input type="text" id="text" placeholder="Add stuff..">
          <button id="add">Add</button>
          <button id="removeAll">Remove all</button>
        </div>

        <div class="border">
          
          

          <ul id="list"></ul>

       </div>
     </div>

     <script type="text/javascript" src="todo2.js"></script>
</body>
</html>

Bonus Features:

Save to Memory

var itemRecord = [];

Sample ToDo List App:

Lets keep a record of all added items in an easy to read and access format also...i.e. an array

  • Declare an empty global array
<!DOCTYPE html>
<html lang="en">
<head>
	<meta charset="UTF-8">
	<title>Simple JavaScript Todo</title>
	<link rel="stylesheet" type="text/css" href="todo2.css">
</head>
<body>
      <div class="wrapper"> 

      	<h1>Todo App:</h1>
          
        <div id="inputarea">
          <input type="text" id="text" placeholder="Add stuff..">
          <button id="add">Add</button>
          <button id="removeAll">Remove all</button>
        </div>

        <div class="border">
          
          

          <ul id="list"></ul>

       </div>
     </div>

     <script type="text/javascript" src="todo2.js"></script>
</body>
</html>
//...

function addLi() 
{
    var inputText = document.getElementById('text').value;

    if(inputText.length > 0)
    {
    	loadItem(inputText);

    	itemRecord.push(inputText);

    }
}

Sample ToDo List App:

Lets keep a record of all added items in an easy to read and access format also...i.e. an array

  • Push newly added items into array also
<!DOCTYPE html>
<html lang="en">
<head>
	<meta charset="UTF-8">
	<title>Simple JavaScript Todo</title>
	<link rel="stylesheet" type="text/css" href="todo2.css">
</head>
<body>
      <div class="wrapper"> 

      	<h1>Todo App:</h1>
          
        <div id="inputarea">
          <input type="text" id="text" placeholder="Add stuff..">
          <button id="add">Add</button>
          <button id="removeAll">Remove all</button>
        </div>

        <div class="border">
          
          

          <ul id="list"></ul>

       </div>
     </div>

     <script type="text/javascript" src="todo2.js"></script>
</body>
</html>
//..

function saveItems()
{
    var saveKey = "todoappitem";
    var arrayConvertedToString = JSON.stringify(itemRecord);

    localStorage.setItem(saveKey,arrayConvertedToString);

}

Sample ToDo List App:

When adding a new item, lets save it to localStorage also

Create a saveItems() function which will store the itemRecord array

<!DOCTYPE html>
<html lang="en">
<head>
	<meta charset="UTF-8">
	<title>Simple JavaScript Todo</title>
	<link rel="stylesheet" type="text/css" href="todo2.css">
</head>
<body>
      <div class="wrapper"> 

      	<h1>Todo App:</h1>
          
        <div id="inputarea">
          <input type="text" id="text" placeholder="Add stuff..">
          <button id="add">Add</button>
          <button id="removeAll">Remove all</button>
        </div>

        <div class="border">
          
          

          <ul id="list"></ul>

       </div>
     </div>

     <script type="text/javascript" src="todo2.js"></script>
</body>
</html>
//..

function addLi() 
{
    var inputText = document.getElementById('text').value;

    if(inputText.length > 0)
    {
    	loadItem(inputText);

    	itemRecord.push(inputText);

    	saveItems();

    }
}

Sample ToDo List App:

Call the saveItems() function from the addLi() function

<!DOCTYPE html>
<html lang="en">
<head>
	<meta charset="UTF-8">
	<title>Simple JavaScript Todo</title>
	<link rel="stylesheet" type="text/css" href="todo2.css">
</head>
<body>
      <div class="wrapper"> 

      	<h1>Todo App:</h1>
          
        <div id="inputarea">
          <input type="text" id="text" placeholder="Add stuff..">
          <button id="add">Add</button>
          <button id="removeAll">Remove all</button>
        </div>

        <div class="border">
          
          

          <ul id="list"></ul>

       </div>
     </div>

     <script type="text/javascript" src="todo2.js"></script>
</body>
</html>
//..

function loadItems()
{
    var saveKey = "todoappitem";

    var arrayInStringFormat = localStorage.getItem(saveKey);
    if(arrayInStringFormat !== null)
    {
	itemRecord = JSON.parse(arrayInStringFormat);
    }
}

Sample ToDo List App:

Create a loadItems() function

get the string that was saved to localstorage in saveItems() function

convert back to array

<!DOCTYPE html>
<html lang="en">
<head>
	<meta charset="UTF-8">
	<title>Simple JavaScript Todo</title>
	<link rel="stylesheet" type="text/css" href="todo2.css">
</head>
<body>
      <div class="wrapper"> 

      	<h1>Todo App:</h1>
          
        <div id="inputarea">
          <input type="text" id="text" placeholder="Add stuff..">
          <button id="add">Add</button>
          <button id="removeAll">Remove all</button>
        </div>

        <div class="border">
          
          

          <ul id="list"></ul>

       </div>
     </div>

     <script type="text/javascript" src="todo2.js"></script>
</body>
</html>
//..

function loadItems()
{
    var saveKey = "todoappitem";

    var arrayInStringFormat = localStorage.getItem(saveKey);
    if(arrayInStringFormat !== null)
    {
	itemRecord = JSON.parse(arrayInStringFormat);

        for(var i=0;i<itemRecord.length;i++)
	{
	    loadItem(itemRecord[i]);
	}
    }
}

Sample ToDo List App:

For each item in the array, create a html element and show it in the list

<!DOCTYPE html>
<html lang="en">
<head>
	<meta charset="UTF-8">
	<title>Simple JavaScript Todo</title>
	<link rel="stylesheet" type="text/css" href="todo2.css">
</head>
<body>
      <div class="wrapper"> 

      	<h1>Todo App:</h1>
          
        <div id="inputarea">
          <input type="text" id="text" placeholder="Add stuff..">
          <button id="add">Add</button>
          <button id="removeAll">Remove all</button>
        </div>

        <div class="border">
          
          

          <ul id="list"></ul>

       </div>
     </div>

     <script type="text/javascript" src="todo2.js"></script>
</body>
</html>
//..

function removeMe()
{

    //"this" is equivlent to the button that was clicked
    var li_item = this.parentElement;
    var ul_item = li_item.parentElement;

    var index = Array.prototype.indexOf.call(ul_item.children, li_item);

    ul_item.removeChild(li_item);


}

Sample ToDo List App:

When we delete an item, we need to also delete it from the itemRecord array

  • We need to figure out what index the item we are removing is from
<!DOCTYPE html>
<html lang="en">
<head>
	<meta charset="UTF-8">
	<title>Simple JavaScript Todo</title>
	<link rel="stylesheet" type="text/css" href="todo2.css">
</head>
<body>
      <div class="wrapper"> 

      	<h1>Todo App:</h1>
          
        <div id="inputarea">
          <input type="text" id="text" placeholder="Add stuff..">
          <button id="add">Add</button>
          <button id="removeAll">Remove all</button>
        </div>

        <div class="border">
          
          

          <ul id="list"></ul>

       </div>
     </div>

     <script type="text/javascript" src="todo2.js"></script>
</body>
</html>
//..

function removeMe()
{

    //"this" is equivlent to the button that was clicked
    var li_item = this.parentElement;
    var ul_item = li_item.parentElement;

    var index = Array.prototype.indexOf.call(ul_item.children, li_item);
    itemRecord.splice(index,1);

    ul_item.removeChild(li_item);


}

Sample ToDo List App:

When we delete an item, we need to also delete it from the itemRecord array

  • When we know the index, we can remove it from the array
<!DOCTYPE html>
<html lang="en">
<head>
	<meta charset="UTF-8">
	<title>Simple JavaScript Todo</title>
	<link rel="stylesheet" type="text/css" href="todo2.css">
</head>
<body>
      <div class="wrapper"> 

      	<h1>Todo App:</h1>
          
        <div id="inputarea">
          <input type="text" id="text" placeholder="Add stuff..">
          <button id="add">Add</button>
          <button id="removeAll">Remove all</button>
        </div>

        <div class="border">
          
          

          <ul id="list"></ul>

       </div>
     </div>

     <script type="text/javascript" src="todo2.js"></script>
</body>
</html>
//..

function removeMe()
{

    //"this" is equivlent to the button that was clicked
    var li_item = this.parentElement;
    var ul_item = li_item.parentElement;

    var index = Array.prototype.indexOf.call(ul_item.children, li_item);
    itemRecord.splice(index,1);
    saveItems();

    ul_item.removeChild(li_item);


}

Sample ToDo List App:

When we delete an item, we need to also delete it from the itemRecord array

  • Finally after removing it from the array, we should re-save the array
<!DOCTYPE html>
<html lang="en">
<head>
	<meta charset="UTF-8">
	<title>Simple JavaScript Todo</title>
	<link rel="stylesheet" type="text/css" href="todo2.css">
</head>
<body>
      <div class="wrapper"> 

      	<h1>Todo App:</h1>
          
        <div id="inputarea">
          <input type="text" id="text" placeholder="Add stuff..">
          <button id="add">Add</button>
          <button id="removeAll">Remove all</button>
        </div>

        <div class="border">
          
          

          <ul id="list"></ul>

       </div>
     </div>

     <script type="text/javascript" src="todo2.js"></script>
</body>
</html>
var checkedRecord = [];

Sample ToDo List App:

Lets also keep a record of which items have been check and which have been not

  • create a checkedRecord array
<!DOCTYPE html>
<html lang="en">
<head>
	<meta charset="UTF-8">
	<title>Simple JavaScript Todo</title>
	<link rel="stylesheet" type="text/css" href="todo2.css">
</head>
<body>
      <div class="wrapper"> 

      	<h1>Todo App:</h1>
          
        <div id="inputarea">
          <input type="text" id="text" placeholder="Add stuff..">
          <button id="add">Add</button>
          <button id="removeAll">Remove all</button>
        </div>

        <div class="border">
          
          

          <ul id="list"></ul>

       </div>
     </div>

     <script type="text/javascript" src="todo2.js"></script>
</body>
</html>
//..

function addLi() 
{
    var inputText = document.getElementById('text').value;

    if(inputText.length > 0)
    {
    	loadItem(inputText);

    	itemRecord.push(inputText);
    	checkedRecord.push(false);

    	saveItems();

    }
}

Sample ToDo List App:

Lets also keep a record of which items have been check and which have been not

  • When adding a new Li, push a false value into the checkedRecord array
<!DOCTYPE html>
<html lang="en">
<head>
	<meta charset="UTF-8">
	<title>Simple JavaScript Todo</title>
	<link rel="stylesheet" type="text/css" href="todo2.css">
</head>
<body>
      <div class="wrapper"> 

      	<h1>Todo App:</h1>
          
        <div id="inputarea">
          <input type="text" id="text" placeholder="Add stuff..">
          <button id="add">Add</button>
          <button id="removeAll">Remove all</button>
        </div>

        <div class="border">
          
          

          <ul id="list"></ul>

       </div>
     </div>

     <script type="text/javascript" src="todo2.js"></script>
</body>
</html>
//..

function saveItems()
{
    var saveKey = "todoappitem";
    var arrayConvertedToString = JSON.stringify(itemRecord);

    localStorage.setItem(saveKey,arrayConvertedToString);

    var saveKeyChecked = "todoappchecked";
    var checkedConvertedToString = JSON.stringify(checkedRecord);

    localStorage.setItem(saveKeyChecked,checkedConvertedToString);

}

Sample ToDo List App:

Lets also keep a record of which items have been check and which have been not

  • Add code to save checkedRecord in saveItems() function
<!DOCTYPE html>
<html lang="en">
<head>
	<meta charset="UTF-8">
	<title>Simple JavaScript Todo</title>
	<link rel="stylesheet" type="text/css" href="todo2.css">
</head>
<body>
      <div class="wrapper"> 

      	<h1>Todo App:</h1>
          
        <div id="inputarea">
          <input type="text" id="text" placeholder="Add stuff..">
          <button id="add">Add</button>
          <button id="removeAll">Remove all</button>
        </div>

        <div class="border">
          
          

          <ul id="list"></ul>

       </div>
     </div>

     <script type="text/javascript" src="todo2.js"></script>
</body>
</html>
//..

function checked()
{
    var li_item = this.parentElement;

    li_item.classList.toggle("selected");

    var ul_item = li_item.parentElement;
    var index = Array.prototype.indexOf.call(ul_item.children, li_item);
    checkedRecord[index] = !checkedRecord[index];

    saveItems();

}

Sample ToDo List App:

When an item is checked, update the checkedRecord to set the corresponding index to true or false

<!DOCTYPE html>
<html lang="en">
<head>
	<meta charset="UTF-8">
	<title>Simple JavaScript Todo</title>
	<link rel="stylesheet" type="text/css" href="todo2.css">
</head>
<body>
      <div class="wrapper"> 

      	<h1>Todo App:</h1>
          
        <div id="inputarea">
          <input type="text" id="text" placeholder="Add stuff..">
          <button id="add">Add</button>
          <button id="removeAll">Remove all</button>
        </div>

        <div class="border">
          
          

          <ul id="list"></ul>

       </div>
     </div>

     <script type="text/javascript" src="todo2.js"></script>
</body>
</html>
//..

function loadItems()
{
	var saveKey = "todoappitem";
	var arrayInStringFormat = localStorage.getItem(saveKey);

	var saveKeyChecked = "todoappchecked";
	var checkedInStringFormat = localStorage.getItem(saveKeyChecked);

	if(arrayInStringFormat !== null && checkedInStringFormat !== null)
	{
		itemRecord = JSON.parse(arrayInStringFormat);
		checkedRecord = JSON.parse(checkedInStringFormat);

		for(var i=0;i<itemRecord.length;i++)
		{
			loadItem(itemRecord[i]);
		}
	}


}

Sample ToDo List App:

When loading the itemRecord, load the checkedRecord also

<!DOCTYPE html>
<html lang="en">
<head>
	<meta charset="UTF-8">
	<title>Simple JavaScript Todo</title>
	<link rel="stylesheet" type="text/css" href="todo2.css">
</head>
<body>
      <div class="wrapper"> 

      	<h1>Todo App:</h1>
          
        <div id="inputarea">
          <input type="text" id="text" placeholder="Add stuff..">
          <button id="add">Add</button>
          <button id="removeAll">Remove all</button>
        </div>

        <div class="border">
          
          

          <ul id="list"></ul>

       </div>
     </div>

     <script type="text/javascript" src="todo2.js"></script>
</body>
</html>
//..

function loadItem(text,isChecked)
{
	var li = document.createElement('li');
    var textNode = document.createTextNode(text + ' ');
  		

    var removeButton = document.createElement('button');
    removeButton.classList.add('removeMe');
    removeButton.textContent = "X";

    removeButton.addEventListener("click",removeMe);

    var checkbox = document.createElement('input');
    checkbox.type = "checkbox";
    checkbox.id = "cb";
    if(isChecked)//<---add this
    {
    	checkbox.checked = true;<---add this
    	li.classList.toggle("selected");<---add this
    }

    checkbox.addEventListener("change",checked)

    li.appendChild(checkbox);
    li.appendChild(textNode);
    li.appendChild(removeButton);

    var ul = document.querySelector('#list');
    ul.appendChild(li);

    

}

Sample ToDo List App:

Modify the loadItem() function to allow true or false checked to be set

  • Add condition that evalutes if checked is true, if it is then check the checkbox and enable the "selected" class for the li
<!DOCTYPE html>
<html lang="en">
<head>
	<meta charset="UTF-8">
	<title>Simple JavaScript Todo</title>
	<link rel="stylesheet" type="text/css" href="todo2.css">
</head>
<body>
      <div class="wrapper"> 

      	<h1>Todo App:</h1>
          
        <div id="inputarea">
          <input type="text" id="text" placeholder="Add stuff..">
          <button id="add">Add</button>
          <button id="removeAll">Remove all</button>
        </div>

        <div class="border">
          
          

          <ul id="list"></ul>

       </div>
     </div>

     <script type="text/javascript" src="todo2.js"></script>
</body>
</html>
//..

function loadItems()
{
	var saveKey = "todoappitem";
	var arrayInStringFormat = localStorage.getItem(saveKey);

	var saveKeyChecked = "todoappchecked";
	var checkedInStringFormat = localStorage.getItem(saveKeyChecked);

	if(arrayInStringFormat !== null && checkedInStringFormat !== null)
	{
		itemRecord = JSON.parse(arrayInStringFormat);
		checkedRecord = JSON.parse(checkedInStringFormat);

		for(var i=0;i<itemRecord.length;i++)
		{
			loadItem(itemRecord[i],checkedRecord[i]);
		}
	}


}

Sample ToDo List App:

Back in the loaditems() function, pass the saved checkedRecord value into the loadItem() function also

<!DOCTYPE html>
<html lang="en">
<head>
	<meta charset="UTF-8">
	<title>Simple JavaScript Todo</title>
	<link rel="stylesheet" type="text/css" href="todo2.css">
</head>
<body>
      <div class="wrapper"> 

      	<h1>Todo App:</h1>
          
        <div id="inputarea">
          <input type="text" id="text" placeholder="Add stuff..">
          <button id="add">Add</button>
          <button id="removeAll">Remove all</button>
        </div>

        <div class="border">
          
          

          <ul id="list"></ul>

       </div>
     </div>

     <script type="text/javascript" src="todo2.js"></script>
</body>
</html>
//..

function removeMe()
{

    //"this" is equivlent to the button that was clicked
    var li_item = this.parentElement;
    var ul_item = li_item.parentElement;

    var index = Array.prototype.indexOf.call(ul_item.children, li_item);
    itemRecord.splice(index,1);
    checkedRecord.splice(index,1);//<--add this
    saveItems();

    ul_item.removeChild(li_item);


}

Sample ToDo List App:

When removing an item, also remove the corresponding checkedRecord item

<!DOCTYPE html>
<html lang="en">
<head>
	<meta charset="UTF-8">
	<title>Simple JavaScript Todo</title>
	<link rel="stylesheet" type="text/css" href="todo2.css">
</head>
<body>
      <div class="wrapper"> 

      	<h1>Todo App:</h1>
          
        <div id="inputarea">
          <input type="text" id="text" placeholder="Add stuff..">
          <button id="add">Add</button>
          <button id="removeAll">Remove all</button>
        </div>

        <div class="border">
          
          

          <ul id="list"></ul>

       </div>
     </div>

     <script type="text/javascript" src="todo2.js"></script>
</body>
</html>
//..

function reset()
{
	var ul = document.querySelector('#list');
	ul.innerHTML = '';

	itemRecord = [];
	checkedRecord = [];

	saveItems();
}

Sample ToDo List App:

Finally, when "remove all" is clicked, reset both record arrays and save

<!DOCTYPE html>
<html lang="en">
<head>
	<meta charset="UTF-8">
	<title>Simple JavaScript Todo</title>
	<link rel="stylesheet" type="text/css" href="todo2.css">
</head>
<body>
      <div class="wrapper"> 

      	<h1>Todo App:</h1>
          
        <div id="inputarea">
          <input type="text" id="text" placeholder="Add stuff..">
          <button id="add">Add</button>
          <button id="removeAll">Remove all</button>
        </div>

        <div class="border">
          
          

          <ul id="list"></ul>

       </div>
     </div>

     <script type="text/javascript" src="todo2.js"></script>
</body>
</html>

week 11 2020

By D.Kelly

Made with Slides.com

week 11 2020

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