c# code to generate barcode Lesson 3: Implementing jQuery in Visual C#.NET

Create Denso QR Bar Code in Visual C#.NET Lesson 3: Implementing jQuery

Lesson 3: Implementing jQuery
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There are few things to notice about this code and markup. First, notice that the script reference to the jQuery library is added to the HeaderContent content area because this code uses a master page. Next, notice that the title of the page is contained in an <h2> tag. This tag also has its display style set to none when the page loads (because you plan to fade it in). Now take a look at the jQuery code. Notice the use of the dollar sign ($); this is equivalent to calling the core jQuery() function. This function is used to select items in your webpage and to respond to jQuery life cycle events. The code, $(document).ready(), is actually selecting the entire document and then indicating what to do when the ready event fires. The ready event is a jQuery client-side event that triggers when the full DOM has been loaded by the browser (like an ASP.NET Page_Load event on the server). You then pass an anonymous function to be executed when this event fires. Note that you could write a function and then pass its name. However, anonymous functions make the code easier to write and to read. Finally, the line that reads, $( h2 ).fadeIn( slow );, uses the jQuery selector function $() to find all instances of the tag <h2>. You then indicate that for all found items, you want to call the jQuery fadeIn function and fade these items in slowly. You should now have a good overview of just how the jQuery language can be used on a webpage in ASP.NET. In the next few sections, you will explore searching the DOM, handling client-side events, adding effects, and making AJAX calls with jQuery in more detail.
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Selecting and Traversing the DOM
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Much of jQuery is about finding items on your page and then doing something with (or to) them. The jQuery functions that find items on your page are called selectors. The base function in jQuery is jQuery() or $() and works as the base selector function. There are three primary ways to pass string arguments to this function:
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Finds all elements with a specified tag name and returns an array of those elements. You simply pass the name of the tag to the selector function, as in $("h2").
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select by element select by iD Allows you to select a single element by its ID. You use the pound (#) character to indicate that you are searching by ID. For example, the element, <span id="someId"> can be searched for by using the function call $("#someId"). select by cascading style sheet Allows you to find all tags with a specific cascading style sheet class name. You use a period (.) to indicate the class name. For example, to find all elements with the cascading style sheet class name of userInputStyle (as in <div class="userInputStyle">), you would use the $(".userInputStyle") selector.
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Advanced Selectors
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The jQuery selectors are very flexible. You can combine the three selection types just listed to get specific with your searches. For example, to select all <span> tags with the cascading style sheet style of sectionHeading, you would write $("span.sectionHeading").
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ChAPTER 9
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Working with Client-Side Scripting, AJAX, and jQuery
There are also several keywords you can use within the selection string to refine your selection, such as :first, :last, :even, :odd, :not, :first-child, and :last-child. You use these keywords appended to your selection parameter with a colon as in $( span:first ) to find the first <span/> tag in the page. jQuery also lets you search the DOM for elements with specific attributes. You do so by using square brackets, as in $( a[href*=MyDomain] ). This code finds all anchor (<a/>) tags in the page that have the text MyDomain as part of the href attribute. The *= indicates a find all search. Table 9-1 describes the available search characters
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