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File upload and Progress events with HTML5 XmlHttpRequest Level 2

The XmlHttpRequest Level 2 specification adds several enhancements to the XmlHttpRequest object. Last week I had blogged about cross-origin-requests and how it is different from Flash\Silverlight's approach .  With Level 2 specification one can upload the file to the server by passing the file object to the send method. In this post I'll try to explore uploading file using XmlHttpRequest 2 in conjunction with the progress events. I'll also provide a description on the new HTML5 tag -  progress which can be updated while the file is being uploaded to the server. And of course, some ColdFusion code that will show how the file is accepted and stored on the server directory.

Server sent events with HTML5 and ColdFusion

There are several ways to interact with the server apart from the traditional request\response and refresh all protocol. They are polling, long polling, Ajax and Websockets ( pusherapp ). Of all these Ajax and Websockets have been very popular. There is another way to interact with the server such that the server can send notifications to the client using Server Sent Events (SSE) . SSE is a part of HTML5 spec:  http://dev.w3.org/html5/eventsource/

Adding beforeRender and afterRender functions to a Backbone View

I was working on a Backbone application that updated the DOM when a response was received from the server. In a Backbone View, the initialize method would perform some operations and then call the render method to update the view. This worked fine, however there was scenario where in I wanted to perform some tasks before and after rendering the view. This can be considered as firing an event before and after the function had completed its execution. I found a very simple way to do this with Underscore's wrap method.