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This article mainly introduces how to use callback function to return attributes in Ajavx. The article is very detailed and has certain reference value. Interested friends must read it!

Return properties using callback functions in Ajavx

A callback function is a function passed as an argument to another function.

If you have multiple AJAX tasks on your site, you should create a function that executes the XMLHttpRequest object and a callback function for each AJAX task.

The function should contain the URL and the function to call when the response is ready.

examples

loadDoc("url-1", myFunction1);

loadDoc("url-2", myFunction2);

function loadDoc(url, cFunction) {

var xhttp;

xhttp = new XMLHttpRequest();

xhttp.onreadystatechange = function() {

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

cFunction(this);

}

};

xhttp.open("GET", url, true);

xhttp.send();

}

function myFunction1(xhttp) {

// action goes here

}

function myFunction2(xhttp) {

// action goes here

}

Server Response Properties

attribute description

responseText Gets response data in string form

responseXML Gets response data in XML data form

Server Response Method

method describes

getResponseHeader() Returns specific header information from the server

getAllResponseHeaders() Returns all header information from the server

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