search is now saved asynchron and without a form which caused some redirection through searches_controller

added asynchronous save of search, removed searches_controller,

app/assets/javascripts/editor/editor.js.erb

@@ -640,9 +640,18 @@ configureEditors: function () {
 
     initializeSearchButton: function(){
         $('#btn-search-col').button().click(function(){
-            var search = $('#search-col').val();
-            var course_token = $('#sidebar-collapsed').data('course_token')
+            var search = $('#search-input-text').val();
+            var course_token = $('#editor').data('course_token')
+            var save_search_url = $('#editor').data('search-save-url')
             window.open("https://open.hpi.de/courses/" + course_token + "/pinboard?query=" + search, '_blank');
+            // save search
+            $.ajax({
+                data: {
+                    search_text: search
+                },
+                dataType: 'json',
+                type: 'POST',
+                url: save_search_url});
         })
 
         $('#sidebar-search-collapsed').on('click',this.handleSideBarToggle.bind(this));