HTML
Telerik Academy Alpha

 

Front-End

 Table of contents

Web Basics

 The Elements of a Web Page

  • A Web page consists of

    • HTML markup

    • CSS rules

    • JavaScript code

      • JS libraries

    • Images

    • Other resources

      • Fonts, audio, video, Flash, Silverlight, etc...

 Web Application

  • Web Application
    • Next level web sites
    • High interactivity
    • High accessibility (Cloud)
    • AJAX, Silverlight, Flash, Flex, etc.
    • Applications are usually broken into logical chunks called "tiers", where every tier is assigned a role
    • Desktop-like application in the web browser

 Web Application

 Web Browser

  • A Web browser is a program designed to enable users to access, retrieve and view documents and other resources from the Web
  • Main responsibilities:
    • Bring information resources to the user (issuing requests to the web server and handling any results generated by the request)
    • Present web content (render HTML, CSS, JS)

 Layout Engines

  • Layout Engines are software components that displays the formatted content on the screen combining:
    • Marked up content (such as HTML, XML, image files, etc.)
    • Formatting information (such as CSS, XSL, etc.)
  • It "paints" on the content area of a window, which is displayed on a monitor or a printer
  • Typically embedded in web browsers, e-mail clients, on-line help systems or other applications that require the displaying (and editing) of web content
  • The layout engine is the "heart of a browser"

HTML

 What is HTML?

  • HTML – Hyper Text Markup Language
    • A notation for describing
      • document structure (semantic markup)
      • formatting (presentation markup)
    • Looks (looked?) like:
      • A Microsoft Word document
  • The markup tags provide information about the page content structure
  • A HTML document consists of many tags

 HTML Terminology

  • Concepts in HTML
    • Tags
      • Opening tag and closing tag
      • The smallest piece in HTML
    • Attributes
      • Properties of the tag
      • Size, color, etc…
    • Elements
      • Combination of opening, closing tag and attributes

 HTML Demo

 HTML

  • Tags are the smallest piece in HTML Document
    • Start with < and end with >
  • Two kinds of tags
    • Opening
      • Mark the start of an HTML element
    • Closing
      • Mark the end of an HTML element
      • Starts with </
<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="UTF-8">
  <title>Document</title>
</head>
<body>
    <!-- The place visible to the end user -->
    <h1>
        Title here
    </h1>
    <div>
        My text here
    </div>
</body>
</html>

 HTML

  • Attributes are properties of HTML Elements
    • Used to set size, color, border, etc…
    • Put directly in the tags
    • Has value surrounded by single ' ' or double " " quotes
    • The value is always a string
  • There are some attributes that are common for every HTML element
    • id, class, name, style
  • Some attributes are specific
    • For example the attribute src of the img element
      • Shows the path to the image to be shown

 HTML Document structure

  • Some elements are essential to each HTML Document:
    html, head, body, doctype
     
  • The html element
    • Used to mark the beginning and ending of a HTML document
    • All the content of the web page is inside this tag

 HTML

 HTML Tags

  • Text formatting tags
Tag Meaning
<b></b> bold
<i></i> italiazed
<u></u> underlined
<sup></sup> superscript
<sub></sub> subscript
<strong></strong> strong (same result as bold but different meaning to the browser)
<em></em> emphasized (same as italized but different meaning to the browser)
<pre></pre> preformatted text

 HTML Tags

  • Hyperlink Tags
<a href="https://telerikacademy.com/" title="Telerik">Link to Telerik Web site</a>
  • Image Tags
<img src="logo.gif" alt="logo" />
  • Text formatting tags
This text is <em>emphasized.</em>
<br />new line<br />
This one is <strong>more emphasized.</strong>

 HTML Tags

HTML Forms

 HTML Forms

  • The primary method for gathering data from site visitors
  • HTML Forms can contain
    • Text fields for the user to type
    • Buttons for interactions like "Register", "Login", "Search"
    • Menus, Sliders, etc…
    • Check Google, Facebook
      • Google search field is a simple Text field

 HTML Forms

  • How to Create a HTML Form?
    • Create a form block with
      • <form></form>
<form name="myForm" method="post" action="path/to/some-file">
   ...
</form>
  • The "action" attribute tells where the form data should be sent
  • The "method" attribute tells how the form data should be sent – via GET or POST request

 Forms - text fields

  • Single-line text input fields
<input type="text" name="FirstName" value="This is a text field" />
  • Multi-line text input fields (textarea)
<textarea name="Comments">
    This is a multi-line text field
</textarea>
  • Password input – a text field which masks the entered text with * signs
<input type="password" name="pass" />

 Forms - buttons

  • Reset button – brings the form to its initial state
<input type="reset" name="resetBtn" value="Reset the form" />
  • Submit button
<input type="submit" name="submitBtn" value="Submit" />
<input type="button" value="Apply Now" />
  • Ordinary button – no default action, used with JS

 Forms - checkbox and radio buttons

  • Checkboxes
<input type="checkbox" name="fruit" value="apple" />
  • Radio buttons
<input type="radio" name="title" value="Mr." />

 Forms - select fields

  • Dropdown menus
<select name="gender">
  <option value="Value 1"
    selected="selected">Male</option>
  <option value="Value 2">Female</option>
  <option value="Value 3">Other</option>
</select>
  • Multiple-choice menus
<select name="products" multiple="multiple">
  <option value="Value 1"
    selected="selected">keyboard</option>
  <option value="Value 2">mouse</option>
</select>

 Forms - input with validation

  • Email, Url, Telephone or custom
<input type="email" required="true" />
<input type="url" required="true" />
<input type="tel" required="true" />
<input required="true" pattern="[^ @]*@[^ @].[^ @]"/>

 iframes

  • Inline frames provide a way to show one website inside another website:
<iframe 
    width="1280" 
    height="720" 
    src="https://www.youtube.com/embed/kJQP7kiw5Fk" 
    frameborder="0" 
    allowfullscreen>
</iframe>

Semantic HTML

 Semantic HTML

  • Semantic HTML is:
    • The use of HTML markup to reinforce the semantics of the information in Web pages
      • Make the content understandable for computers
    • Rather than merely to define its presentation
    • A kind of metadata about the HTML content
  • Semantic HTML is processed by regular Web browsers and other user agents
    • CSS is used to suggest its presentation to human users

 Semantic HTML

  • Semantic HTML is:
    • Easier to read by developers, parsers, bots, machines, AIs
    • A way to show the search engines the correct content

 Semantic HTML

  • Just follow some guidelines when creating a Web site
    • Use HTML5 semantic tags
      • <header>, <nav>, <section>, <article>, <aside>, <footer>
    • Use Headings when you need to structure the content into sub-headings
      • In increasing order, staring with <h1>
    • Do not use empty tags
      • Like a clearing <div>

 Semantic HTML

  • HTML5 introduces semantic structure tags
    • Imagine the following site:
    • This is a common Web page structure
      • Used in 90% of the web sites

Questions?

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[FE] HTML

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