generate qr code in c# Working with jQuery in C#.NET

Generate QR Code in C#.NET Working with jQuery

Working with jQuery
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When writing JavaScript intensive applications, you ll find it quite natural to put a piece of code at the top of each page and set up the DOM to serve the desired logic within the page. Typically, this code initializes global variables and prepares the ground for possible future actions. Ideally, you also want to use this initialization code to arrange event handlers, caching, and downloads of external data.
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Part V
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The Client Side
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Because jQuery is designed to query the DOM and work with selected elements, any initialization code should reasonably run only when the DOM is ready. Detecting DOM readiness and writing initialization code with jQuery library is easier than ever.
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Detecting DOM Readiness
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In the beginning of client-side development, there was just one place where you could put the initialization code of a Web page in the onload event on either the window object or the <body> tag. The onload event fires as soon as the page has finished loading that is, once the download of all linked images, CSS styles, and scripts has terminated. There s no guarantee, however, that at this time the DOM has been fully initialized and is ready to accept instructions.
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The DOM ReadyState Property
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The document root object in the DOM exposes a read-only readyState property just to let you know the current state of the DOM and figure out when it is OK for your page to start scripting it. Any change to the property is signaled with a readyStateChange event. Web pages are notified of DOM readiness by registering a handler for this event and checking the value of the readyState property in the code. Most browsers also support the DOMContentLoaded event, which just signals when the DOM is ready. Internet Explorer, however, doesn t support it. Using the readyState property is an approach that definitely works, but it is a bit cumbersome. For this reason, most JavaScript frameworks offer their own ready event that signals when you can start making calls into the framework safely. In this way, they shield you from the details of the DOM implementation and just let you know when you can do your own thing. The jQuery library is no exception.
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The jQuery s Ready Function
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In jQuery, you select the current DOM document and call the ready function on it. The ready function encapsulates the code to check the value of the readyState property on the DOM s document object. The ready function takes an anonymous function as a parameter. The argument function is where you specify any initialization code required for the document. Here s how you use it:
<script type="text/javascript"> $(document).ready( function() { alert("I m ready!"); }); </script>
21
jQuery Programming
The jQuery s ready function provides a cross-browser solution to detect the DOM readiness. Note that the ready function works only if it s invoked on the current document. You can t call the ready function on, say, an image, a script, or a portion of the DOM. In light of this, you can even omit the document selector and resort to the equally acceptable syntax shown here:
<script type="text/javascript"> $(function() { alert("I m ready!"); }); </script>
The two syntaxes are equivalent. Another approach consists of using the bind method to bind a handler to the ready event of the document:
$(document).bind("ready", function() { ... });
In this case, though, the handler won t run if at the time of event binding the ready event has already fired. Finally, the ready handler is delayed until the document is ready or runs immediately if the document is already entirely loaded. I ll return to bind and other event functions later in the chapter.
Onload vs. Ready
Which code runs first, the window s onload event handler or the call s jQuery ready function The onload event is called after the HTML and any auxiliary resources are loaded. The ready function is called after the DOM is initialized. The two events can run in any order. The onload event won t ensure the page DOM is loaded; the ready function won t ensure all resources, such as images, have been loaded. Another noticeable difference between onload and ready is that you can have multiple calls to ready in a page. You can have only one global onload event handler either defined on the window object or expressed as an attribute on the body tag. When multiple calls to ready are specified, jQuery pushes specified functions to an internal stack and serves them sequentially after the DOM is effectively ready. It is generally recommended that you use either the ready function or the onload handler. If you need both things, you should use the jQuery s load function attached to the window object or to more specific elements such as images, scripts, or style sheets:
$(window).load(function() { // Initialization code here });
You typically use load when you need to access specific information on specific page elements such as images or scripts. So in summary, you rarely end up using load on the window object.
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