how to print barcode labels in c# Part V in C#.NET

Creator Denso QR Bar Code in C#.NET Part V

Part V
Printing QR Code In C#
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QR Code ISO/IEC18004 Recognizer In Visual C#
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The Client Side
Generating Bar Code In C#
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Decoding Barcode In C#
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Note that most of the time, though, you ll use selectors that match just a single DOM element. If multiple elements are selected, no data duplication will ever occur only the reference is duplicated, not the data. The jQuery cache is implemented as a plain dictionary where each element is characterized by a name and a value. What about naming conventions to ensure uniqueness of entries Binding data to DOM elements, in full respect of the jQuery philosophy, is also helpful because it makes it significantly simpler to name elements. Cached entries can have the same name as long as they are bound to different DOM elements.
Drawing Quick Response Code In .NET Framework
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Generating Quick Response Code In Visual Studio .NET
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Working with Data in the In-Memory Cache
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To add data to the cache, you select the DOM elements and then invoke the data function, passing the key and value.
1D Barcode Creation In C#
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$("#Grid1").data("DataSource", value)
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The cache is fairly useful for storing data you download once and reuse frequently within the page. When you have a master/detail view and you get data for the detail view via Ajax, a call to the data function can save you roundtrips within the same session. Have a look at Figure 21-4.
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FIGURE 21-4 An Ajax page that retrieves customer details from the server.
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21
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jQuery Programming
Creating UPCA In VB.NET
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Recognizing Code 39 Extended In None
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Every time the user selects a letter, the page downloads the list of all customers whose name begins with the letter. If the user clicks twice on, say, A, the list of customers is downloaded only once. Here s the script code that manages the clicking:
// Attempt to grab data from the cache first var data = loadFromCache(selection); if (typeof (data) !== undefined ) { fillViewInternal(data, true); return; } // Grab data from the server asynchronously loadFromSource(selection);
Inside of the loadFromCache function, you simply build the key and place a call to the data function:
function loadFromCache(query) { var key = "Customers_" + query; var cachedInfo = $("#RootView").data(key); return cachedInfo; }
Inside of the loadFromSource function, instead, you store downloaded data right into the cache object:
var key = "Customers_" + query; $("#RootView").data(key, downloadedInfo);
Once it s placed in the cache, the data never expires and must be removed manually to free up memory. To remove a piece of data from the cache, you use the removeData method:
$("#RootView").removeData(key);
Ajax Capabilities
Ajax support in jQuery is centered on an abstraction of the browser s XMLHttpRequest object and counts on a bunch of helper functions that address specific scenarios, such as getting a JSON response, getting a script file, or performing a cross-domain call.
Part V
The Client Side
Plain Ajax Caller
In jQuery, to compose and control all aspects of your Web request, you use the ajax function, as shown next:
$.ajax( { type: "POST", url: "getOrder.aspx", data: "id=1234&year=2010", success: function(response) { alert( response ); } } );
The ajax function gets a list of parameters, such as type, url, data, dataType, cache, async, and success. The dataType parameter indicates the type of the expected response (for example, HTML, XML, JSON, JSONP, script). A few other parameters exist to let you further configure the HTTP request. You can refer to the jQuery online documentation for further details. The URL is http://api.jquery.com/jQuery.ajax. The async parameter indicates whether the call has to go asynchronously or not. The cache Boolean parameter indicates whether you want the library to cache the response for future access to the same URL. Ajax calls are always cached by default except for when the data type is JSONP or script. The $.ajax function supports several callbacks. The beforeSend callback is invoked just before sending the request out. The callback receives the settings of the call and represents your last chance to modify the call. The complete callback is invoked as soon as the response is received and regardless of the outcome. The callback receives a description of the HTTP status of the request and indicates whether the request completed successfully, resulted in an error, timed out, or pointed to a resource that was not modified. The callback won t receive the actual response, if there is any. Past the complete callback, the library fires either the success or error callback, depending on the context. The success callback receives the response sent over the wire by the server. The error callback gets a code for the type of error (timeout, parse, or error) and an exception object that provides, if possible, more details about the failure. On top of the ajax function, a number of shortcut functions have been created that make it simpler for developers to place certain specific types of calls, such as calls for getting a script file or a JSON string. The get and post functions also exist to perform plain HTTP GET and POST requests.
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