I am trying to get the source code of HTML by using an XMLHttpRequest with a URL. How can I do that?
I am new to programming and I am not too sure how can I do it without jQuery.
This question is related to
javascript
html
ajax
url
xmlhttprequest
First, you must know that you will never be able to get the source code of a page that is not on the same domain as your page in javascript. (See http://en.wikipedia.org/wiki/Same_origin_policy).
In PHP, this is how you do it:
file_get_contents($theUrl);
In javascript, there is three ways :
Firstly, by XMLHttpRequest : http://jsfiddle.net/635YY/1/
var url="../635YY",xmlhttp;//Remember, same domain
if("XMLHttpRequest" in window)xmlhttp=new XMLHttpRequest();
if("ActiveXObject" in window)xmlhttp=new ActiveXObject("Msxml2.XMLHTTP");
xmlhttp.open('GET',url,true);
xmlhttp.onreadystatechange=function()
{
if(xmlhttp.readyState==4)alert(xmlhttp.responseText);
};
xmlhttp.send(null);
Secondly, by iFrames : http://jsfiddle.net/XYjuX/1/
var url="../XYjuX";//Remember, same domain
var iframe=document.createElement("iframe");
iframe.onload=function()
{
alert(iframe.contentWindow.document.body.innerHTML);
}
iframe.src=url;
iframe.style.display="none";
document.body.appendChild(iframe);
Thirdly, by jQuery : [http://jsfiddle.net/edggD/2/
$.get('../edggD',function(data)//Remember, same domain
{
alert(data);
});
]4
Edit: doesnt work yet...
Add this to your JS:
var src = fetch('https://page.com')
It saves the source of page.com to variable 'src'
There is a tutorial on how to use Ajax here: https://www.w3schools.com/xml/ajax_intro.asp
This is an example code taken from that tutorial:
<html>
<head>
<script type="text/javascript">
function loadXMLDoc()
{
var xmlhttp;
if (window.XMLHttpRequest)
{
// Code for Internet Explorer 7+, Firefox, Chrome, Opera, and Safari
xmlhttp = new XMLHttpRequest();
}
else
{
// Code for Internet Explorer 6 and Internet Explorer 5
xmlhttp = new ActiveXObject("Microsoft.XMLHTTP");
}
xmlhttp.onreadystatechange=function()
{
if (xmlhttp.readyState==4 && xmlhttp.status==200)
{
document.getElementById("myDiv").innerHTML = xmlhttp.responseText;
}
}
xmlhttp.open("GET", "ajax_info.txt", true);
xmlhttp.send();
}
</script>
</head>
<body>
<div id="myDiv"><h2>Let AJAX change this text</h2></div>
<button type="button" onclick="loadXMLDoc()">Change Content</button>
</body>
</html>
For an external (cross-site) solution, you can use: Get contents of a link tag with JavaScript - not CSS
It uses $.ajax() function, so it includes jquery.
Use jQuery:
$.ajax({ url: 'your-url', success: function(data) { alert(data); } });
This data is your HTML.
Without jQuery (just JavaScript):
function makeHttpObject() {
try {return new XMLHttpRequest();}
catch (error) {}
try {return new ActiveXObject("Msxml2.XMLHTTP");}
catch (error) {}
try {return new ActiveXObject("Microsoft.XMLHTTP");}
catch (error) {}
throw new Error("Could not create HTTP request object.");
}
var request = makeHttpObject();
request.open("GET", "your_url", true);
request.send(null);
request.onreadystatechange = function() {
if (request.readyState == 4)
alert(request.responseText);
};
You can use fetch to do that:
fetch('some_url')
.then(function (response) {
switch (response.status) {
// status "OK"
case 200:
return response.text();
// status "Not Found"
case 404:
throw response;
}
})
.then(function (template) {
console.log(template);
})
.catch(function (response) {
// "Not Found"
console.log(response.statusText);
});
Asynchronous with arrow function version:
(async () => {
var response = await fetch('some_url');
switch (response.status) {
// status "OK"
case 200:
var template = await response.text();
console.log(template);
break;
// status "Not Found"
case 404:
console.log('Not Found');
break;
}
})();
Source: Stackoverflow.com