4. Embed in your page <html> <head> <script src=“path/to/jquery-x.x.x.js"> </script> <script> $(document).ready(function(){ // Start here }); </script> </head> <body> … </body> </html>
5. jQuery philosophy Find Some Elements $(“div”).addClass(“xyz”); } Do something with them jQuery Object
6. A Basic Example $(“p”).addClass(“red”); Selects all paragraphs. Adds a class to them. This avoids- <body> <div> <p class=“red”>I m a paragraph -1</p> <p class=“red”>I m a paragraph -2</p> </div> <p class=“red”>I m another paragraph</p> </body>
7. Selector Basics Selecting By Id $(“#header”) Selecting By Class $(“.updated”) Selecting by tag name $(“table”) Combine them $(“table.user-list”) $(“#footer ul.menuli”)
9. Jquery Events click(), bind(), unbind(), change(), keyup(), keydown, …..and many more Start when DOM is ready $(document).ready(function(){ $(selector).eventName(function(){…}); });
11. Iterating thro’ Elements .each() To iterate, exclusively, over a jQuery object $.each() To iterate over any collection, whether it is a map (JavaScript object) or an array.
13. $.each() Example vararr = ["one", "two", "three", "four", "five"]; varobj = { one: 1, two: 2, three: 3, four: 4, five: 5 }; $(document).ready(function () { jQuery.each(arr, function () { $("#" + this).text("Mine is " + this + "."); return (this != "three"); // will stop running after "three" }); jQuery.each(obj, function (i, val) { $("#" + i).append(document.createTextNode(" - " + val)); }); });
14. $.extend() Merge the contents of two or more objects together into the first object. Syntax $.extend( [ deep ], target, object1, [ objectN ] ) deep - If true, the merge becomes recursive. target - The object to extend. It will receive the new properties. object1 - An object containing additional properties to merge in. objectN - Additional objects containing properties to merge in.
15. $.extend() - Example Merge two objects, modifying the first var settings = { validate: false, limit: 5, name: "foo" }; var options = { validate: true, name: "bar" }; jQuery.extend(settings, options); Result: settings == { validate: true, limit: 5, name: "bar" }
17. $.extend() - Example Merge defaults and options, without modifying the defaults. This is a common plugin development pattern. var empty = {} var defaults = { validate: false, limit: 5, name: "foo" }; var options = { validate: true, name: "bar" }; var settings = $.extend(empty, defaults, options); Result: settings == { validate: true, limit: 5, name: "bar" } empty == { validate: true, limit: 5, name: "bar" }
18. $.fn.extend() Extends the jQuery element set to provide new methods (used to make a typical jQuery plugin). Syntax //You need an anonymous function to wrap around your function to avoid conflict (function($){ //Attach this new method to jQuery $.fn.extend({ //This is where you write your plugin's name pluginname: function() { //Iterate over the current set of matched elements return this.each(function() { //code to be inserted here }); } });
19. $.fn.extend() - Example Reverse Text of Odd rows <script type="text/javascript"> $(document).ready(function () { $('ulli:odd').reverseText({ minlength: 6, maxlength: 10 }); }); </script> <body> <form id="form1" runat="server"> <div> <ul id="menu"> <li>Home</li> <li>Posts</li> <li>About</li> <li>Contact Us</li> </ul> </div> </form> </body> Desired Result
20. $.fn.extend() - Example (function($) { // jQuery plugin definition $.fn.reverseText = function(params) { //$.fn.extend({ reverseText: function(params) {… // merge default and user parameters params = $.extend( {minlength: 0, maxlength: 99999}, params); // traverse all nodes this.each(function() { // express a single node as a jQuery object var $t = $(this); // find text varorigText = $t.text(), newText = ''; // text length within defined limits? if (origText.length >= params.minlength && origText.length <= params.maxlength) { // reverse text for (vari = origText.length-1; i >= 0; i--) newText += origText.substr(i, 1); $t.text(newText); } }); // allow jQuery chaining return this; }; });
21. Jquery and AJAX jQuery.ajax() or $.ajax() Performs an asynchronous HTTP (Ajax) request.
22. jQuery.ajax() The $.ajax() function underlies all Ajax requests sent by jQuery At its simplest, the $.ajax() function can be called with no arguments: Note: Default settings can be set globally by using the $.ajaxSetup() function Several higher-level alternatives like $.get() and .load() are available and are easier to use. If less common options are required, though, $.ajax() can be used more flexibly. $.ajax();
23. jQuery.ajax() Syntax $.ajax({ type: type, url: url, data: data, success: success, dataType: dataType }); Type that describes whether the request if GET or POST URL of the HTTPHandler Data specifying the querystring Success defining a function which manipulates the response from the handler DataTypeDifferent data handling can be achieved by using the dataType option. The dataType can be plain xml, html, json, jsonp, script, or text.
24. jQuery.ajax() : Example Save some data to the server and notify the user once it's complete. $.ajax({ type: "POST", url: "some.aspx", data: "name=John&location=Boston", success: function(msg){ alert( "Data Saved: " + msg ); }});
