How Do I Retrieve and Display HTML Response Data from an XMLHttpRequest?

Retrieving Response Data from XMLHttpRequest

In web development, XMLHttpRequest allows for asynchronous data communication between a web page and a remote server. One common task is retrieving the HTML content of a remote URL into a JavaScript variable.

Getting the Response HTML

To access the HTML of the accessed site, use XMLHttpRequest.responseText within the XMLHttpRequest.onreadystatechange event handler. Here's an example:

<br>var xhr = new XMLHttpRequest();<br>xhr.onreadystatechange = function() {<br>  if (xhr.readyState === XMLHttpRequest.DONE) {</p>
<pre class="brush:php;toolbar:false">alert(xhr.responseText);

}
};
xhr.open('GET', 'http://foo.com/bar.php', true);
xhr.send(null);

Cross-Browser Compatibility

For wider browser compatibility, consider using jQuery:

<br>$.get('http://foo.com/bar.php', function(responseText) {<br>  alert(responseText);<br>});<br>

Same-Origin Policy Considerations

Note that the Same-Origin Policy for JavaScript restricts access to data from a different origin unless additional measures are taken, such as creating a proxy script on your own domain.

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