Ajax Events
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Ajax Events
The onreadystatechange event
When a request to a server is sent, we want to perform some actions based on the response.
The onreadystatechange event is triggered every time the readyState changes.
The readyState property holds the status of the XMLHttpRequest.
Three important properties of the XMLHttpRequest object:
Property | Description |
---|---|
onReadyStateChange | It is called whenever readystate attribute changes. It must not be used with synchronous requests. |
readyState | represents the state of the request. It ranges from 0 to 4.
|
status | 200: "OK" 404: Page not found |
In the onreadystatechange event, we specify what will happen when the server response is ready to be processed. When readyState is 4 and status is 200, the response is ready:
Syntax
xmlhttp.onreadystatechange=function() { if (xmlhttp.readyState==4 && xmlhttp.status==200) { document.getElementById("myDiv").innerHTML=xmlhttp.responseText; } }
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