Download Comet and Reverse Ajax: The Next-Generation Ajax 2.0 by By (author) Phil McCarthy By (author) Dave Crane PDF

By By (author) Phil McCarthy By (author) Dave Crane

Ajax has been out for it slow now, with none tremendous adjustments, development etc. good, as time appears close to an Ajax 2.0 evolution, this firstPress bargains with the rising Comet and opposite Ajax applied sciences which could arguably later outline a part of the following new release Ajax 2.0. Comet and opposite Ajax: the subsequent iteration Ajax 2.0 is the 1st and basically publication of its style masking Comet and opposite Ajax during this aspect. Written via Ajax professional and top promoting writer, Dave Crane, this publication is a realistic, hands-on source for builders who are looking to preview or even use a few of what is going to most probably be within the subsequent scorching Ajax 2.0 unlock.

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Length>l) ? show(); } } The baker object has three methods representing the Hfe cycle of the Comet request. The s t a r t () method hides the button to prevent multiple submits, identifies the output element on screen, and initiates the call to the server. Request object here. Idiomatic use of Aj ax. Request typically involves adding only one callback when the request completes, but the object does accept callbacks corresponding to any ready state. Here, you've added callbacks to both the interactive and the complete stages.

The most interesting time is when you've received some data but are waiting for more data to come in. So you'll hit the interactive state fairly quickly, when the first message reaches the browser, and won't be notified again until the last message comes in. Actually, this is a worst-case scenario. In some browsers, you'll get notified more frequently, but you can't rely on that. Once you hit the interactive state, you'll need to set up your own timer to repeatedly check for new data. output=$("bake_status"); $ ("bake__button" ) .

To that end, you'll continue rolling your own code in the next section and take your first steps towards using Comet. Comet and Reverse Ajax firstPress 31 Chapter 3: Introducing Comet In Chapter 2, you looked at polling and piggybacking techniques to see how far you could get with creating an interactive collaborative application. Along the way, you found yourself juggling timeout periods, responsiveness, and server/network loads, without reaching a satisfactory balance between the various factors.

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