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copied!<p>I've had similar problems working heavily with SharePoint web services - you often need to pull data from multiple sources before you're able to continue working.</p> <p>To solve it I embedded this kind of functionality into my AJAX abstraction library. You can easily define a request which will trigger a set of handlers when complete. However each request can be defined with multiple http calls. Here's the component:</p> <p><a href="http://depressedpress.com/javascript-extensions/dp_ajax/" rel="nofollow">DPAJAX at DepressedPress.com</a></p> <p>This very simple example creates one request with three calls and then passes that information, in the call order, to a single handler:</p> <pre><code> // The handler function function AddUp(Nums) { alert(Nums[1] + Nums[2] + Nums[3]) }; // Create the pool myPool = DP_AJAX.createPool(); // Create the request myRequest = DP_AJAX.createRequest(AddUp); // Add the calls to the request myRequest.addCall("GET", "http://www.mysite.com/Add.htm", [5,10]); myRequest.addCall("GET", "http://www.mysite.com/Add.htm", [4,6]); myRequest.addCall("GET", "http://www.mysite.com/Add.htm", [7,13]); // Add the request to the pool myPool.addRequest(myRequest); </code></pre> <p>Note that unlike many of the other solutions provided this method does not force single threading of the calls being made - each will still run as quickly as the environment allows but the handler will only be called when all are complete. The component also supports user-defined numbers of requests so you can force single-threading easily if you like. It also supports the setting of timeout values and retry attempts if your service is a little flakey.</p> <p>I've found it insanely useful (and incredibly simple to understand) for this kind of work.</p>

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