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This article will explain in detail what the attribute meaning of onreadystatechange in Aajx is. The editor thinks it is very practical, so I share it for you as a reference. I hope you can get something after reading this article.

The attribute meaning of onreadystatechange in Aajx

The readyState property holds the state of the XMLHttpRequest.

The onreadystatechange attribute defines the function to execute when the readyState changes.

The status and statusText properties store the state of the XMLHttpRequest object.

Attribute description

Onreadystatechange defines the function to be called when the readyState property changes.

ReadyState

The state of XMLHttpRequest is saved.

0: request is not initialized

1: the server connection has been established

2: the request has been received

3: processing request

4: request completed and response ready

Status

"OK"

"Forbidden"

"Page not found"

For a complete list, please visit the Http message reference manual

StatusText returns status text (such as "OK" or "Not Found")

The onreadystatechange function is called whenever the readyState changes.

When readyState is 4 and status is 200, the response is ready:

Example

Function loadDoc () {

Var xhttp = new XMLHttpRequest ()

Xhttp.onreadystatechange = function () {

If (this.readyState = = 4 & & this.status = = 200) {

Document.getElementById ("demo") [xss_clean] =

This.responseText

}

}

Xhttp.open ("GET", "ajax_info.txt", true)

Xhttp.send ()

}

Note: onreadystatechange is triggered five times (0-4), and each time the readyState changes.

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