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The jQuery library provides a bunch of global handlers for Ajax events so that you can register your handlers that are invoked for each Ajax operation regardless of the code that triggers it. You can add handlers for the events in Table 21-8.
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TABLE 21-8
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Fires upon completion of any Ajax request, regardless of the outcome Fires when an Ajax call fails Fires when an Ajax request is sent Fires when an Ajax request begins being processed Fires when no pending Ajax requests are left Fires when an Ajax request completes with success
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ajaxComplete ajaxError ajaxSend ajaxStart ajaxStop ajaxSuccess
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You can have multiple handlers for each of these events. If multiple handlers are registered, all of them are invoked in order.
Getting Scripts
The getScript function requires you to provide the URL for the script file and an optional callback to execute upon downloading the script. Here s the signature of the function:
$.getScript(url, succeededCallback)
The interesting thing about the function is that the downloaded script is processed by jQuery right after download. This means that in the callback, you can already start using objects and features available in the script:
<script type="text/javascript"> $.getScript("mylib.js", function() { // Start using the features of the downloaded script here ... }); </script>
The request being placed for the script is an HTTP GET. Keep in mind that if you need to tweak the request beyond the hardcoded settings of the getScript function, you better resort to the ajax function.
Getting JSON
The getJSON function is ideal for invoking an HTTP endpoint that is expected to return a JSON-encoded string. Here s the signature of the function:
$.getJSON(url, inputData, succeededCallback)
Part V
The Client Side
When you make a JSON request, you might need to send some data over to the remote server to guide the generation of the response. The second argument to getJSON represents the input you intend to pass. Here s an example:
var playerId = 1; $.getJSON("/yourServer/Player/Details", playerId, function(jsonData) { // Start using the information stored in the downloaded object here displayDetailsForPlayer(jsonData); });
The getJSON function appends any input data to the URL as a query string. If the data is not of a primitive type, the function will convert it to a string before appending it to the URL. The request is placed as an HTTP GET request. Any response is assumed to be JSON and is parsed as such using the global $.parseJSON function. The callback receives the parsed data ready to use.
Getting HTML
A frequent action you might want to perform from a client page is downloading some HTML via a simple GET request. The load function is an instance (as opposed to global) function that you can call over a wrapped set. Here s the signature of the function:
$(selector).load(url, inputData, succeededCallback)
Note that input data and callback function are optional. In particular, the method is automatically bound to a default callback function that appends the downloaded markup to all elements in the wrapped set. Here s an example:
var templateType = 1; $("#panelAdvancedOptions").load("/template.aspx", templateType);
If any callback is provided in the call, it is executed after the default callback. No call is ever attempted if the wrapped set is empty. If the input data is a JavaScript object, the request goes out as a POST instead of a GET. You are not forced to download the entire content of the provided URL. If the URL contains a white space, anything that follows is interpreted as a jQuery selector. Look at the following example:
$("#panelAdvancedOptions").load("/template.aspx #area_1");
The entire URL content is downloaded, but jQuery then discards everything but the DOM tree selected by the #area_1 expression. When you use load, you should be aware that some tags might be discarded during the parsing process. This typically occurs with tags such as <html> and <title>, which are usually already part of the page.
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