fixed provider.json using jsonp

lib/torque/provider.json.js

@@ -343,13 +343,26 @@
       };
       var url = this._tilerHost() + "/tiles/layergroup";
       var extra = this._extraParams();
-      torque.net.post( url + (extra ? "?" + extra: ''), JSON.stringify(layergroup) , function (req) {
+
+      // tiler needs map_key instead of api_key
+      // so replace it
+      if (extra) {
+        extra = extra.replace('api_key=', 'map_key=');
+      }
+
+      url = url +
+        "?config=" + encodeURIComponent(JSON.stringify(layergroup)) +
+        "&callback=?" + (extra ? "&" + extra: '');
+
+      torque.net.jsonp(url, function (data) {
         var query = format("select * from ({sql}) __torque_wrap_sql limit 0", { sql: self.getSQL() });
         self.sql(query, function (queryData) {
+          if (data) {
             callback({
-            updated_at: JSON.parse(req.response).last_updated,
+              updated_at: data.last_updated,
               fields: queryData.fields
             });
+          }
         }, { parseJSON: true });
       });
     },

lib/torque/request.js

@@ -4,6 +4,41 @@
 
   var lastCall = null;
 
+  function jsonp(url, callback, options) {
+     options = options || { timeout: 10000 };
+     var head = document.getElementsByTagName('head')[0];
+     var script = document.createElement('script');
+
+     // function name
+     var fnName = 'torque_' + Date.now();
+
+     function clean() {
+       head.removeChild(script);
+       clearTimeout(timeoutTimer);
+       delete window[fnName];
+     }
+
+     window[fnName] = function() {
+       clean();
+       callback.apply(window, arguments);
+     };
+
+     // timeout for errors
+     var timeoutTimer = setTimeout(function() { 
+       clean();
+       callback.call(window, null); 
+     }, options.timeout);
+
+     // setup url
+     url = url.replace('callback=\?', 'callback=' + fnName);
+     script.type = 'text/javascript';
+     script.src = url;
+     script.async = true;
+     // defer the loading because IE9 loads in the same frame the script
+     // so Loader._script is null
+     setTimeout(function() { head.appendChild(script); }, 0);
+  }
+
   function get(url, callback, options) {
     options = options || {
       method: 'GET',
@@ -52,6 +87,7 @@
   torque.net = {
     get: get,
     post: post,
+    jsonp: jsonp,
     lastCall: function() { return lastCall; }
   };
 

test/request.js

@@ -0,0 +1,30 @@
+module('request')
+
+asyncTest("json", 6, function() {
+  var called = null;
+  torque.net.jsonp('http://test.com?callback=?', function(test) {
+    called = arguments;
+  });
+
+  setTimeout(function() {
+    var scripts = document.getElementsByTagName('script');
+    var found = null;
+    for (var i = 0 ; !found && i < scripts.length; ++i) {
+      var s = scripts[i];
+      if (s.getAttribute('src').indexOf('test.com') !== -1) {
+        found = s;
+      }
+    }
+    var src = found.getAttribute('src');
+    var fnName = src.match(/torque_.*/);
+    window[fnName]('test1', 2, null);
+    equal(src.indexOf('http://test.com?callback=torque_'), 0);
+    equal(called[0], 'test1');
+    equal(called[1], 2);
+    equal(called[2], null);
+    equal(found.parent, null);
+    equal(window[fnName], undefined);
+    QUnit.start();
+  }, 5);
+
+});

test/suite.html

@@ -19,5 +19,6 @@
   <script src="core.js"></script>
   <script src="provider.jsonarray.js"></script>
   <script src="provider.json.js"></script>
+  <script src="request.js"></script>
 </body>
 </html>