index.html update

Author: ddmitov

CREDITS.md

@@ -132,6 +132,8 @@ https://stackoverflow.com/questions/16452699/how-to-reset-a-form-using-jquery-wi
 https://stackoverflow.com/questions/3955229/remove-all-child-elements-of-a-dom-node-in-javascript  
 https://stackoverflow.com/questions/11478324/syntaxerror-unexpected-eof-when-evaluating-javascript-in-ios-uiwebview  
 https://stackoverflow.com/questions/42053775/getting-error-form-submission-canceled-because-the-form-is-not-connected  
+https://stackoverflow.com/questions/4467044/proper-way-to-catch-exception-from-json-parse  
+https://stackoverflow.com/questions/29797946/handling-bad-json-parse-in-node-safely  
 
 https://jquery.com/  
 http://youmightnotneedjquery.com/  

resources/app/index.html

@@ -74,13 +74,21 @@
 
       interactive_one.stdoutFunction = function (stdout) {
         var target = document.getElementById('instance-one-output');
-        var output = JSON.parse(stdout);
+
+        var output = null;
+        try {
+          output = JSON.parse(stdout);
+        } catch(exception) {
+          return null;
+        }
+
         var html;
         if ("user_input" in output) {
           html = output.time + '<br>' + output.user_input;
         } else {
           html = output.time;
         };
+
         target.innerHTML = html;
       }
 
@@ -103,13 +111,21 @@
 
       interactive_two.stdoutFunction = function (stdout) {
         var target = document.getElementById('instance-two-output');
-        var output = JSON.parse(stdout);
+
+        var output = null;
+        try {
+          output = JSON.parse(stdout);
+        } catch(exception) {
+          return null;
+        }
+
         var html;
         if ("user_input" in output) {
           html = output.time + '<br>' + output.user_input;
         } else {
           html = output.time;
         };
+
         target.innerHTML = html;
       }