add 'Import' functionality.

dream/platform/__init__.py

@@ -38,6 +38,12 @@ def front_page():
   return redirect(url_for('static', filename='index.html'))
 
 
+@app.route("/postJSONFile", methods=["POST", "OPTIONS"])
+def postJSONFile():
+  data = json.load(request.files['file'])
+  app.logger.debug("postJSONFile:%r" % data)
+  return jsonify(data)
+
 @app.route("/positionGraph", methods=["POST", "OPTIONS"])
 def positionGraph():
   """Uses graphviz to position nodes of the graph.

dream/platform/static/index.html

@@ -26,6 +26,9 @@
         <a id="layout_graph">Layout Graph</a>
         <a id="zoom_in">Zoom +</a>
         <a id="zoom_out">Zoom -</a>
+        <a id="export">Export</a>
+        <a id="import">Import</a>
+        <form id="import_form" style="display:none"><input id="import_file" name="file" type="file"></input></form>
       </div>
     </div>
 

dream/platform/static/src/dream_launcher.js

@@ -439,6 +439,40 @@
         dream_instance.zoom_out();
       });
 
+    // Enable "Export" button
+    $("#export").button().click(
+      function (e) {
+        alert('not yet implemented');
+      });
+
+    // Enable "Import" button
+    $("#import").button().click(
+      function (e) {
+        $('#import_file').click();
+      });
+    $("#import_file").change(function() {
+      var form = $(this).parent('form')[0];
+      var form_data = new FormData(form);
+      $.ajax('/postJSONFile', {
+        type: 'POST',
+        contentType: false,
+        processData: false,
+        data: form_data,
+        dataType: 'json',
+        error: function() {
+            console.log('error');
+        },
+        success: function(data, textStatus, jqXHR) {
+          form.reset();
+          id_container = {};
+          dream_instance.clearAll();
+          $("#json_output").val(JSON.stringify(data));
+          loadData(data);
+        }
+      });
+      return false;
+    });
+
     // Redraw if the graph area or the window is resized
     $('#main').resizable().resize(function () {
       dream_instance.redraw();