allows using all Jquery AJAX methods in Greasemonkey

GM_XHR.js

// allows using all Jquery AJAX methods in Greasemonkey
// inspired from http://ryangreenberg.com/archives/2010/03/greasemonkey_jquery.php
// works with JQuery 1.5
// (c) 2011 Martin Monperrus
// (c) 2010 Ryan Greenberg
//
// Usage:
//   $.ajax({
//     url: '/p/',
//     xhr: function(){return new GM_XHR();},
//     type: 'POST',
//     success: function(val){
//        ....
//     }
//   });
function GM_XHR() {
    this.type = null;
    this.url = null;
    this.async = null;
    this.username = null;
    this.password = null;
    this.status = null;
    this.headers = {};
    this.readyState = null;

    this.abort = function() {
        this.readyState = 0;
    };

    this.getAllResponseHeaders = function(name) {
      if (this.readyState!=4) return "";
      return this.responseHeaders;
    };

    this.getResponseHeader = function(name) {
      var regexp = new RegExp('^'+name+': (.*)$','im');
      var match = regexp.exec(this.responseHeaders);
      if (match) { return match[1]; }
      return '';
    };

    this.open = function(type, url, async, username, password) {
        this.type = type ? type : null;
        this.url = url ? url : null;
        this.async = async ? async : null;
        this.username = username ? username : null;
        this.password = password ? password : null;
        this.readyState = 1;
    };
    
    this.setRequestHeader = function(name, value) {
        this.headers[name] = value;
    };

    this.send = function(data) {
        this.data = data;
        var that = this;
        // http://wiki.greasespot.net/GM_xmlhttpRequest
        GM_xmlhttpRequest({
            method: this.type,
            url: this.url,
            headers: this.headers,
            data: this.data,
            onload: function(rsp) {
                // Populate wrapper object with returned data
                // including the Greasemonkey specific "responseHeaders"
                for (var k in rsp) {
                    that[k] = rsp[k];
                }
                // now we call onreadystatechange
                that.onreadystatechange();
            },
            onerror: function(rsp) {
                for (var k in rsp) {
                    that[k] = rsp[k];
                }
            }
        });
    };
};

Hi Martin,

Thanks for sharing this snippet - it has been very useful.

I seem to have stumbled upon a bug in the onerror handler. Testing, if making an ajax call to a web server that is shutdown, it should pretty much get an immediate error response, but using GM_XHR with jquery does not. I think the that.onreadystatechange(); method needs to also be called at the end of the onerror function. I've just done a very quick patch rather than the whole fork and issue a pull request. See what you think and whether it should be added to your class.

Cheers,
Damien.

diff -u GM_XHR.js GM_XHR2.js
--- GM_XHR.js 2014-05-22 11:49:24.000000000 +1000
+++ ../../999065/GM_XHR.js 2014-05-22 11:44:08.000000000 +1000
@@ -74,7 +74,9 @@
for (var k in rsp) {
that[k] = rsp[k];
}

•            // now we call onreadystatechange
  

•            that.onreadystatechange();
       }
   });
  

  };
  -};
  \ No newline at end of file
  +};

I think changes to jQuery may have broken this, since it was created.

The error message "that.onreadystatechange is not a function", is all I can get out of it.

Is there an updated version, anywhere on the net? Or, ideas for a fix?

Yes.

From 2385c1267dc966da27107d23f7d9870420126297 Mon Sep 17 00:00:00 2001
From: Alexander Georgievskiy <[email protected]>
Date: Wed, 25 May 2016 23:49:10 +0300
Subject: [PATCH]


---
 GM_XHR.js | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/GM_XHR.js b/GM_XHR.js
index df79732..d3d9b6e 100644
--- a/GM_XHR.js
+++ b/GM_XHR.js
@@ -61,6 +61,7 @@ function GM_XHR() {
             url: this.url,
             headers: this.headers,
             data: this.data,
+            responseType: this.responseType,
             onload: function(rsp) {
                 // Populate wrapper object with returned data
                 // including the Greasemonkey specific "responseHeaders"
@@ -68,12 +69,14 @@ function GM_XHR() {
                     that[k] = rsp[k];
                 }
                 // now we call onreadystatechange
-                that.onreadystatechange();
+                if (that.onload) that.onload(); else that.onreadystatechange();
             },
             onerror: function(rsp) {
                 for (var k in rsp) {
                     that[k] = rsp[k];
                 }
+                // now we call onreadystatechange
+                if (that.onerror) that.onerror(); else that.onreadystatechange();
             }
         });
     };
-- 
2.8.3.windows.1

Replace
for (k in rsp) { that[k] = rsp[k]; }
To
for (var k in Object.getOwnPropertyNames(rsp)) { that[Object.getOwnPropertyNames(rsp)[k]] = rsp[Object.getOwnPropertyNames(rsp)[k]]; }

It's work for me.