Introduction to Jquery

Introduction to Jquery

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  Prepared by: AhmedEL-Harouny Senior Software Engineer
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  1. What is JQuery? 2. Referencing JQuery library 3. Using Content Delivery Networks (CDN) 4. Go through Documentation 5. Using the JQuery Ready Function 6. Basic Selectors 1. Select By Tag Name 2. Select By ID 3. Select By Class 4. Select By Attributes 7. Dom Manipulations 1. Concepts 2. Iterate through objects 3. Modify properties and attributes 4. Create objects 5. Adding and Removing objects
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  8. Handling Events 1. Binding To Events 2. Click Event 3. Change Event 4. Mouse Events 5. Unbind Events 6. The Live() function
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  jQuery is afast JavaScript Library that simplifies HTML document traversing, event handling, animating, and Ajax interactions for rapid web development. This means moving from this: To This:
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  1. Download thelatest lib from jquery.com 2. Add Reference to it on the page <script src="Scripts/jquery-1.7.2.min.js" type="text/javascript"></script> Note: Always use minified versions of the script during runtime because you will get significant decrease in the file size of the file.
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   A CDN — short for Content Delivery Network — distributes static content across servers in various, physical locations. When a user’s browser resolves the URL for these files, their download will automatically target the closest available server in the network.  How? <script src=“http://ajax.googleapis.com/ajax/libs/jquery/1.7.2/jquery.min.js" type="text/javascript"></script>  When you include JQuery using a CDN service you will get the following benefits: ◦ High Availability ◦ Performance ◦ Caching  Available free JQuery CDNs: ◦ Google http://ajax.googleapis.com/ajax/libs/jquery/1.7.2/jquery.min.js ◦ Microsoft http://ajax.aspnetcdn.com/ajax/jQuery/jquery-1.7.2.min.js ◦ JQuery http://code.jquery.com/jquery-1.7.2.min.js
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  http://docs.jquery.com/Main_Page
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  Use document readyfunction to execute code that depends on DOM elements. The code you write will execute when the DOM is ready to be traversed and manipulated. Or use this shortcut:
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  When using JQueryselectors to select DOM objects; a wrapped set (Array) is returned to you where each item in that set is a wrapper on the native DOM object
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  Your awesome selectorshandbook! http://api.jquery.com/category/selectors/
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   Multiple Applying Any manipulation function you call on a wrapped set is applied to all elements in the set.  Chaining All manipulation functions returns the wrapper set again after executing its logic.
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  The each() functionof the wrapped set:
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   The attr() function Used to Set and Get Attributes Get Value: Set Value:
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   Other manipulation function (mostly shortcuts to attr() function): ◦ val() getting and setting form elements values ◦ addClass() add class to an element ◦ removeClass() remove class from an element ◦ toggleClass() toggles a class for an element ◦ removeAttr() removes an attribute from an element ◦ hide() hides an element from the page ◦ show() shows an element from the page ◦ css() alter css for an element
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   html() function used to get and set inner HTML of an element Get html: Set html:  text() function used to get and set inner text of an element Note: when providing html tags to text function JQuery HTML-encodes it.
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   append() insert DOM content (parameter) to the end of the caller DOM element  appendTo() insert DOM content the caller to the end of a DOM element (parameter)  prepend() insert DOM content (parameter) to the beginning of the caller DOM element  prependTo() insert DOM content the caller to the beginning of a DOM element (parameter)  remove() removes DOM element from the DOM