Ajax Comet Tutorial

Ajax Readystate Values

We looked at AjaxHandlerreadyState and if the state 4 then its almost ready and almost fully loaded. In the processRequest function the readyState property value is retrieved to determine if request has loaded completely and if HTTP status is OK.

Ajax

First we initialize the XMLHttpRequest object which is responsible for making AJAX calls.

Ajax readystate values. AJAX applications might use XML to transport data but it is equally common to transport data as plain text or JSON text. Request finished and response is ready. Interactive - Has loaded enough and the user can interact with it.

Loop on the response to read values. ReadyState 2 After you have called send. Loading - Is loading.

The only change is that this one use documentreadyState. Parse the thisresponseText to JSON object and select and empty it. Ajaxonreadystatechange function if thisreadyState 4.

OPENED HEADERS_RECEIVED LOADING and DONE. READYSTATE_UNINITIALIZED Default initialization state. ReadyState has a total of 5 state values 0-4 each of which represents a different meaning.

Contains values that indicate what state an object is in. Client has been created. The operation is complete.

A set of keyvalue pairs that configure the Ajax request. Possible values for the readyState. Implement Wait Utility in the Framework.

Server connection established 2. A default can be set for any option with ajaxSetup. Open has been called.

Specify GET request and AJAX file path with parameter ajaxfilephprequest1 inopen method. A readyState value of 4 indicates that the request has loaded completely. ReadyState 1 After you have called the open method but before you have called send.

If myrequestreadyState4 if request has completed. One of five values. Returns the status of the XMLHttpRequest.

Set Content-type and handle server response with onreadystatechange property. The XMLHttpRequest object has a readyState property and the value of that property changes during the request lifecycle. It can hold one of four values.

Load XMLHttpRequest object starts to send request. ResponseText holds partial data. Complete - Fully loaded.

Core Level 3 Document Object. Create a New Package and name it as selenium by right click on the srctestjava and select New PackageAs this some what related to Selenium WebDriverWait I like to call it as selenium package. Initialization XMLHttpRequest object has not completed initialization.

Status will have value 200 when everything goes right. Enum READYSTATE READYSTATE_UNINITIALIZED 0 READYSTATE_LOADING 1 READYSTATE_LOADED 2 READYSTATE_INTERACTIVE 3 READYSTATE_COMPLETE 4 End Enum Constants. To learn more about status code please check Status Code definition.

When server reponse has been completedone xhrreadyState 4. When the readyState value is 4 and status value is 200 the response is ready xhronreadystatechange function if xhrreadyState 4. A status value of 200 indicates that the HTTP status is OK.

Open not called yet. All settings are optional. When running your Ajax script online to test for a fully complete and successful Ajax request look for a readyState value of 4 plus a status code of 200.

A String representing the status of the current document. ReadyState will have value 4 when the request is donecompleted. It then check if the HTTP status is between 200 to 299 if xhrstatus 200 xhrstatus 300 if yes it means the requested has been successful.

Request not initialized 1. The following table provides a list of the possible values for the readyState property readyState 0 After you have created the XMLHttpRequest object but before you have called the open method. Now if the ready state 4 and the status 200 then the file has been loaded and we can execute the code inside of the if statement.

AJAX is a misleading name. After loading the request of XMLHttpRequest object is sent. Holds the status of the XMLHttpRequest.

Send has been called and headers and status are available. Var myrequestnew ajaxRequest myrequestonreadystatechangefunction. This also implemented in the same way.

Uninitialized - Has not started loading yet. We also checked if the AjaxHandlerstatus 200. Defines a function to be called when the readyState property changes.

Loaded - Has been loaded. AJAX allows web pages to be updated asynchronously by exchanging data with a web server behind the scenes. See jQueryajax settings below for a complete list of all settings.

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