Ajax how many states

Update panels can be nested to have more control over the Page Refresh. ErrorTemplate which is the child tag of Script Manager is used to handle exception handling in Ajax. This is highly recommended for a consistent web application architecture. An Ajax Web Application tends to confuse end users if the network bandwidth is slow and there is no full postback running.

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The onreadystatechange property defines a function to be executed when the readyState changes. The onreadystatechange event is triggered four times , one time for each change in the readyState. The responseText property returns the server response as a JavaScript string, and you can use it accordingly:. The getAllResponseHeaders method returns all header information from the server response. The getResponseHeader method returns specific header information from the server response. We just launched W3Schools videos.

Stage 0 is that state in which there is not any XMLHttpRequest is being sent to the server, so the request is being initialized. Then here comes State 2, in which the request which was initialized in the state 1, will be sent to the server.

And after sending the request to the server the main process will start, which will depend upon the nature of the request being sent.

And in the end, there is the last state in which request is completed by the server and the final response is being sent to the client end. You must keep this thing in mind that all these calls are asynchronous and the server will not be busy at any moment.

There are some methods which are being used for Ajax calls: To send off a request to the server, we use the open method and the send method: xmlHttp.