AJAX XMLHttpRequest readyState
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The XMLHttpRequest object can be used to exchange data with a web server behind the scenes. This means that it is possible to update parts of a web page, without reloading the whole page.
When XMLHttpRequest object make a request to the server it goes through process of cycle till it get response.XMLHttpRequest is responsible for request/readyState using onreadystatechange property which triggers or fires a event as readyState changes.
XMLHttpRequest object has various properties like
onreadystatechangereadyStateresponseTextresponseXMLstatusstatusText
Let's check it out XMLHttpRequest object properties in detailed way.
| Property | Description |
|---|---|
| onreadystatechange | Defines a function to be called when the readyState property changes |
| readyState | Holds the status of the XMLHttpRequest. 0: request not initialized 1: server connection established 2: request received 3: processing request 4: request finished and response is ready |
| responseText | Returns the response data as a string |
| responseXML | Returns the response data as XML data |
| status | Returns the status-number of a request 200: "OK" 403: "Forbidden" 404: "Not Found" |
| statusText | Returns the status-text (e.g. "OK" or "Not Found") |
Categories: Java Script Tags: #JavaScript,