Adds data-params handling for handleMethod. This allows the link_to h…

…andler with e.g. method: "post" to add post fields from the a-tags data-params attribute to the form

src/rails.js

@@ -186,6 +186,7 @@
       var href = rails.href(link),
         method = link.data('method'),
         target = link.attr('target'),
+        params = link.attr('params'),
         csrf_token = $('meta[name=csrf-token]').attr('content'),
         csrf_param = $('meta[name=csrf-param]').attr('content'),
         form = $('<form method="post" action="' + href + '"></form>'),
@@ -194,6 +195,12 @@
       if (csrf_param !== undefined && csrf_token !== undefined) {
         metadata_input += '<input name="' + csrf_param + '" value="' + csrf_token + '" type="hidden" />';
       }
+
+      if(params) {
+        for(key in params) {
+          metadata_input += '<input name="' + key + '" value="' + params[key] + '" type="hidden" />';
+        }
+      }
 
       if (target) { form.attr('target', target); }