GM.xmlHttpRequest
From GreaseSpot Wiki
Description
This API method provides access to the chrome-privileged XMLHttpRequest object. This means that it is possible to issue requests to domains other than that of the current page.
Additional reference may be found at:
Syntax
GM_xmlhttpRequest( details )
- Compatibility: Greasemonkey 0.2.5+
- Returns: Nothing
details Object Properties Event Handler Callbacks methodonloadurlonreadystatechangeheadersonerroroverrideMimeTypedata
- All properties and event handler callbacks are optional except method and url.
Properties
method
- Value: String
- Usage:
details.method = "GET"';
url
- Value: String
- Usage:
details.url = "http://www.greasespot.net/"';
headers
- Value: Object
- Usage:
details.headers = {"User-Agent":"Mozilla/5.0"};
- The
headersproperty is an object which is typically used to override the default browser generated headers, also known as atoms. It should contain the atom-value pairs of the headers to send.
overrideMimeType
- Value: String
- Usage:
details.overrideMimeType = "application/xhtml+xml";
data
- Value: String
- Usage:
details.data = null;
Event Handler Callbacks
onload
- Usage:
details.onload = function (response) { // Some code }; - Returns: Nothing
onreadystatechange
- Usage:
details.onreadystatechange = function (response) { // Some code }; - Returns: Nothing
onerror
- Usage:
details.onerror = function (details) { // Some code }; - Returns: Nothing
response Object Properties Event Handler Callbacks responseTextstatusstatusTextreadyStateresponseHeaders
Properties
responseText
- Value: String
- Usage:
alert(response.responseText);
status
- Value: Number
- Usage:
if (response.status == 200) { //Some code };
statusText
- Value: String
- Usage:
if (response.statusText == "OK") { //Some code };
readyState
- Value: Number
- Usage:
if (response.readyState == 4) { //Some code }
responseHeaders
- Value: String
- Usage:
if (response.responseHeaders) { //Some code };
- The
responseHeadersis the string representation of response headers returned byXMLHTTPRequest.getAllResponseHeaders().
Examples
GM_xmlhttpRequest({
method:"GET",
url:"http://www.greasespot.net/",
headers:{
"User-Agent":"Mozilla/5.0", // Recommend using navigator.userAgent when possible
"Accept":"text/xml"
},
onload:function(response) {
alert([
response.status,
response.statusText,
response.readyState,
response.responseHeaders,
response.responseText
].join("\n"));
}
});
Notes
Some header atoms may not actually work through GM_xmlhttpRequest. The Referer atom is one that is known to be recognized but appears to be content filtered by the browser. This may be due to security restrictions to keep user scripts from doing unsafe things.
- http://groups.google.com/group/greasemonkey-dev/browse_thread/thread/77c94cc17c6b2669
- http://userscripts.org/forums/1/topics/1302?page=1#posts-5312
Some users have reported problems with international character sets. See these mailing list threads
- http://www.mozdev.org/pipermail/greasemonkey/2006-June/008785.html
- http://www.mozdev.org/pipermail/greasemonkey/2006-April/008064.html
The overrideMimeType parameter became available in version 0.6.8.
