Bootstrap

Mobile-first development

{review}

jQuery

JavaScript library

DOM Manipulation

Event handling

Animation

Ajax calls (getting data)

jQuery Basics

Select element

$('selector')

Get attribute

$('#my-svg').attr('height') // height of svg
$('#my-p').css('font-size') // css properties
$('#my-div').text() // text in div
$('input').val() // value of input

Set attribute

$('#my-svg').attr('height', '400px')
$('p').css('font-size', '20px')
$('#my-input').val('input value')
$('#my-div').text('The new text')

{mobile-first}

What?

Why?

How?

{what}

{why?}

Why mobile?

Why first?

Graceful degradation v.s. progressive enhancement

Easier to add than remove

Do the hard work up front

{how?}

What can it do?

Set-up

<head>
    <meta charset="utf-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1">
    <!-- The above 3 meta tags *must* come first in the head;-->
</head>

Set device width

    <!-- Latest compiled and minified CSS -->
    <link rel="stylesheet" href="https://.../bootstrap.min.css">

    <!-- Optional theme -->
    <link rel="stylesheet" href="https://.../bootstrap-theme.min.css">

    <!-- jquery library, required for bootstrap JS to run -->
    <script src="https://.../jquery.min.js"></script>
	
    <!-- Latest compiled and minified JavaScript -->
    <script src="https://.../bootstrap.min.js"></script>

Read in libraries

The Grid

Horizontal sections as rows

Vertical sections as columns

Column 1

Column 2

Column 3

Row 1

Row 2

Columns

There are 12 columns in the grid

Elements can take up many columns

Row 1:

Row 2:

Row 3:

Specify columns based on screen-size

Syntax

<body>
    <div class="container">
        <div class="row">    
            <div class="col-md-6">6 columns on a medium screen</div>
            <div class="col-md-6">6 columns on a medium screen</div>
        </div>
    </div>
</body>

Set columns for desired device

Create elements

Under the hood

@media screen and (max-width: 300px) {
    body {
        background-color: lightblue;
    }
}

Media queries

Conditional styles

An aside

div[class^="col-"] {
    border:1px solid gray;
}

Cool trick

Apply to all divs with class col-*

Navigation

<nav class="navbar navbar-default">
    <div class="container">
        <!-- Header for mobile -->
        <div class="navbar-header">
            ....
        </div>
        <!-- Screen navigation elements -->
        <div id="navbar" class="navbar-collapse collapse">
            ...
        </div>
</nav>

Use bootstrap's built in navigation classes

Use lists to build controls

<ul class="nav navbar-nav">
    <li class="active"><a href="#">Home</a></li>
    <li><a href="#about">About</a></li>
    <li><a href="#contact">Contact</a></li>
</ul>

Actions

$(".nav li").on("click", function() {
     $(".nav li").removeClass("active");
     $(this).addClass("active");
});

Assign actions with jQuery

What does this do:

Button groups

This looks nice

<div class="btn-group" role="group" aria-label="...">
  <button type="button" class="btn btn-default">Left</button>
  <button type="button" class="btn btn-default">Middle</button>
  <button type="button" class="btn btn-default">Right</button>
</div>

Tooltips

Add title properties to elements

<button type="button" title="Hover info">Hover</button>

Activate tooltips

$('selector').tooltip()

Modals

But not at all

Like alerts

Emulator

Assignment

Bootstrap challenge (due Thursday before class)