I'm trying to access wikipedia using javascript+CORS
As far as I know, wikipedia should support CORS: http://www.mediawiki.org/wiki/API:Cross-site_requests
I tried the following script: create a XMLHttpRequest+credential/XDomainRequest, add some Http-Headers ( "Access-Control-Allow-Credentials",...) and send the query.
http://jsfiddle.net/lindenb/Vr7RS/
var WikipediaCORS=
{
setMessage:function(msg)
{
var span=document.getElementById("id1");
span.appendChild(document.createTextNode(msg));
},
// Create the XHR object.
createCORSRequest:function(url)
{
var xhr = new XMLHttpRequest();
if ("withCredentials" in xhr)
{
xhr.open("GET", url, true);
}
else if (typeof XDomainRequest != "undefined")
{
xhr = new XDomainRequest();
xhr.open(method, url);
}
else
{
return null;
}
xhr.setRequestHeader("Access-Control-Allow-Credentials", "true");
xhr.setRequestHeader("Access-Control-Allow-Origin","*");
return xhr;
},
init:function()
{
var _this=this;
var url = 'http://en.wikipedia.org/w/api.php?action=opensearch&search=Javascript&format=json';
var xhr = this.createCORSRequest(url);
if (!xhr)
{
this.setMessage('CORS not supported');
return;
}
xhr.onload = function()
{
_this.setMessage(xhr.responseText);
};
xhr.onerror = function()
{
_this.setMessage('Woops, there was an error making the request.');
};
xhr.send();
}
};
But my script fails ('xhr.onerror' is called). How can I fix it ?
Thanks.
I had the same problem while working on a freeCodeCamp project and the solution was so simple it made me laugh, since I had spent hours searching for it. In your jQuery URL include the parameter below.
&origin=*
$.getJSON(
'https://en.wikipedia.org/w/api.php?action=query&format=json&gsrlimit=15&generator=search' +
'&origin=*' + // <-- this is the magic ingredient!
'&gsrsearch='q, function(data){ /* ... */ }
);