GM.xmlHttpRequest

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Revision as of 13:17, 6 December 2007 by Marti (talk | contribs) (→‎Notes)
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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:

[Examples][Notes]

Syntax

GM_xmlhttpRequest( details )

Compatibility: Greasemonkey 0.2.5+
Returns: Nothing
details Object
Properties Event Handler Callbacks
method onload
url onreadystatechange
headers onerror
overrideMimeType
data
  • All properties and event handler callbacks are optional except method and url.

Properties


method

Value: String
Usage: details.method = "GET"';

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url

Value: String
Usage: details.url = "http://www.greasespot.net/"';

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headers

Value: Object
Usage: details.headers = {"User-Agent":"Mozilla/5.0"};
The headers property 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.

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overrideMimeType

Value: String
Usage: details.overrideMimeType = "application/xhtml+xml";

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data

Value: String
Usage: details.data = null;

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Event Handler Callbacks


onload

Usage: details.onload = function (response) { // Some code };
Returns: Nothing

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onreadystatechange

Usage: details.onreadystatechange = function (details) { // Some code };
Returns: Nothing

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onerror

Usage: details.onerror = function (details) { // Some code };
Returns: Nothing

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response Object
Properties Event Handler Callbacks
responseText
status
statusText
readyState
responseHeaders

Properties


responseText
Value: String
Usage: alert(response.responseText);

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status
Value: Number
Usage: if (response.status == 200) { //Some code };

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statusText
Value: String
Usage: if (response.statusText == "OK") { //Some code };

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readyState
Value: Number
Usage: if (response.readyState == 4) { //Some code }

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responseHeaders
Value: String
Usage: if (response.responseHeaders) { //Some code };
The responseHeaders is the string representation of response headers returned by XMLHTTPRequest.getAllResponseHeaders().

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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"));
  }
});

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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.

Some users have reported problems with international character sets. See these mailing list threads

The overrideMimeType parameter became available in version 0.6.8.

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