Tuesday, July 22, 2008

Adding a loading animation to your AJAX requests

I think AJAX is great. It can be a little confusing for the user if the response is not immediate though. In cases like these it is nice to give the user some feedback so that they know that something is happening and when it is done. I like to a little spinning wheel or something to indicate this condition. You can easily add this to most requests that are AJAX based with only a few lines of code.

// register the event listeners so we will receive the events 
//when they are fired by the AJAX.NET framework

function BeginRequest(sender, args) {
  // srcElement is the object that invoked the AJAX call. For example, maybe a textfield
  var srcElement = args.get_postBackElement();
  // the path should point to a nice animated gif.
  srcElement.style.backgroundImage = 'url(images/loading.gif)';
  srcElement.style.backgroundRepeat = "no-repeat";
  srcElement.style.backgroundPosition = "right";

You can use what ever image you want for the animation. I like this one from the AJAX toolkit. It is from the DynamicPopulate Demo

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