submitting form triggers a JSON response from server, added more error checking closes #36

predict/ajax.php

@@ -73,31 +73,31 @@ case "getModelByUUID":
 
 case "submitForm":
     $pred_model = array();
+    $json_return = array();
+    $json_return['valid'] = "false";
 
     if ( isset($_POST['submit'])) {
         // form was submitted, let's run a pred!
         // first, make a model from the form data
         if ( !$pred_model = createModel($_POST)) {
-            echo false;
-            break;
+            $json_return['error'] = "Server couldn't make a model from the form data";
+        // if that worked, make sure the model is valid
+        } else if ( !verifyModel($pred_model, $software_available) ) {
+            $json_return['error'] = "The server said the model it made was invalid";
+        // if we have a valid model, try and make a UUID
+        } else if ( !$pred_model['uuid'] = makesha1hash($pred_model) ) {
+            $json_return['error'] = "Couldn't make the SHA1 hash";
+        // if all of the above worked, let's run the prediction
+        } else {
+            runPred($pred_model);
+            $json_return['valid'] = "true";
+            $json_return['uuid'] = $pred_model['uuid'];
+            $json_return['timestamp'] = $pred_model['timestamp'];
         }
-
-        // verify the model
-        if ( !verifyModel($pred_model, $software_available) ) {
-            echo false;
-            break;
-        }
-
-        // make a sha1 hash of the model for uuid
-        $pred_model['uuid'] = makesha1hash($pred_model); 
-
-        // now we have a populated model, run the predictor
-        runPred($pred_model);
-        echo true . "|" . $pred_model['uuid'] . "|" . $pred_model['timestamp'];
     } else {
-        echo "The form submit function was called without any data";
-        echo false;
+        $json_return['error'] = "The form submit function was called without any data";
     }
+    echo json_encode($json_return);
     break;
 
 default:

predict/js/pred.js

@@ -497,20 +497,23 @@ function setupEventHandlers() {
     $("#modelForm").ajaxForm({
         url: 'ajax.php?action=submitForm',
         type: 'POST',
+        dataType: 'json',
         success: function(data) {
-            var data_split = data.split("|");
-            if ( data_split[0] == 0 ) {
+            if ( data.valid == "false" ) {
                 appendDebug("The server rejected the submitted form data");
-                throwError("The server rejected the submitted form data");
+                throwError("The server rejected the submitted form data: \n" +
+                    data.error);
                 resetGUI();
-            } else {
+            } else if ( data.valid == "true" ) {
                 predSub();
                 appendDebug("The server accepted the form data");
                 // update the global current_uuid variable
-                current_uuid = data_split[1];
+                current_uuid = data.uuid;
                 appendDebug("The server gave us uuid:<br>" + current_uuid);
                 appendDebug("Starting to poll for progress JSON");
                 handlePred(current_uuid);
+            } else {
+                appendDebug("data.valid was not a recognised state: " + data.valid);
             }
         }
     });