fixed douplicate functions for getting nodes and topics

backend/js/custom_topics.js

@@ -0,0 +1,55 @@
+function Topic(name, type)
+{
+  this.name = name;
+  this.type = type;
+
+  this.includeInBag = false;
+
+  this.equals = function (otherTopic)
+  {
+    if( this.name == otherTopic.name && this.type == otherTopic.type)
+    {
+      return true;
+    }
+    return false;
+  };
+
+};
+
+function containsTopic(obj, list) {
+    var x;
+    for (x in list) {
+        if (obj.equals(list[x])) {
+            return true;
+        }
+    }
+
+    return false;
+}
+
+function testToics()
+{
+  var topics = [new Topic("a","a_t"), new Topic("b","b_t"), new Topic("c","c_t")];
+
+  console.log("Testing Topic");
+
+  if (containsTopic(new Topic("a","a_t"),topics) == true)
+  {
+    console.log("pass")
+  }
+  else
+  {
+    console.log(" contains true fail")
+  }
+
+  if (containsTopic(new Topic("d","d_t"),topics) == false)
+  {
+    console.log("pass")
+  }
+  else
+  {
+    console.log(" contains d fail")
+  }
+}
+
+testToics();