Added try-catch blocks for better error handling. Removed buggy code …

…for disabling question box.

QualtricsGoogleMapLatLong.js

@@ -1,34 +1,39 @@
-/* 
+/*
  * Qualtrics Google Map Lat/Long Collector
  *
  * Written by George Walker <[email protected]>
  *
  * Last changed Feb. 24, 2017.
- * 
+ *
  * This javascript allows a Qualtrics user to collect a lat/long from a
  * Google Map in a survey. To use it, create a new "Text Entry" question,
  * then add this JavaScript to the question. You can set variables below.
  * These include the lattitude and longitude to center the map at, the
  * zoom level of the map, and the text to display when hovering over the
  * map's pin. It also includes the width and height of the map.
  */
- 
+
 // Enter your Google Map API key in this variable:
 var googleMapAPIKey = "Your Key";
 
 
 // Load the Google Maps API if it is not already loaded.
-if (typeof googleMapJS == 'undefined') {
-	var googleMapJS;
-	if (googleMapJS == null) {
-		googleMapJS = document.createElement('script');
-		if (googleMapAPIKey == "Your Key" || googleMapAPIKey == null) {
-			googleMapJS.src = 'https://maps.googleapis.com/maps/api/js';
-		} else {
-			googleMapJS.src = 'https://maps.googleapis.com/maps/api/js?key=' + googleMapAPIKey;
-		}
-		document.head.appendChild(googleMapJS);
-	}
+try {
+    if (typeof googleMapJS == 'undefined') {
+    	var googleMapJS;
+    	if (googleMapJS == null) {
+    		googleMapJS = document.createElement('script');
+    		if (googleMapAPIKey == "Your Key" || googleMapAPIKey == null) {
+    			googleMapJS.src = 'https://maps.googleapis.com/maps/api/js';
+    		} else {
+    			googleMapJS.src = 'https://maps.googleapis.com/maps/api/js?key=' + googleMapAPIKey;
+    		}
+    		document.head.appendChild(googleMapJS);
+    	}
+    }
+} catch (err) {
+    console.log("Unable to load Google Maps API. Details: " + err);
+    alert("Unable to load Google Maps API.");
 }
 
 Qualtrics.SurveyEngine.addOnload(function()
@@ -38,64 +43,74 @@ Qualtrics.SurveyEngine.addOnload(function()
 	var mapCenterLng = -96.5717;
 	var mapZoom = 16; // See https://developers.google.com/maps/documentation/javascript/tutorial#zoom-levels for help.
 	var pinTitle = "Move pin to correct location"; // This is displayed when hovering over the pin on the map.
-	
-	
+
+
 	var mapWidth = "100%";
 	var mapHeight = "300px";
-	
-	
+
+
 	// Get the data entry box and store it in a variable
 	var dataBox = document.getElementById("QR~" + this.questionId);
-	
+
 	// Get the question container and store it in a variable.
 	var questionContainer = this.getQuestionContainer();
-
-	// Create a map object and append it to the question container.
-	var mapObject = document.createElement('div');
-	mapObject.setAttribute("id", this.questionId + "-map");
-	mapObject.style.width = mapWidth;
-	mapObject.style.height = mapHeight;
-	questionContainer.appendChild(mapObject);
-	var mapID = this.questionId + "-map";
-
-	// Disable manual text entry into data box
-	dataBox.disable();
-
+
+    try {
+        // Create a map object and append it to the question container.
+    	var mapObject = document.createElement('div');
+    	mapObject.setAttribute("id", this.questionId + "-map");
+    	mapObject.style.width = mapWidth;
+    	mapObject.style.height = mapHeight;
+    	questionContainer.appendChild(mapObject);
+    	var mapID = this.questionId + "-map";
+    } catch (err) {
+        console.log("Unable to create map object. Details: " + err);
+        alert("An error occurred creating the map.");
+    }
+
 	// Hide the data box
-	dataBox.style.display = 'none';
+    try {
+	    dataBox.style.display = 'none';
+    } catch (err) {
+        console.log("Unable to hide data box.");
+    }
 
 	// Add event listener to perform Google Map stuff once API is loaded.
-	googleMapJS.addEventListener('load', function() {
-
-		// Store the Google Map in a variable
-		var map = new google.maps.Map(document.getElementById(mapID), {
-			center: {
-				lat: mapCenterLat,
-				lng: mapCenterLng
-			},
-			zoom: mapZoom
-		});
-
-		// Create a new marker in the center of the map.
-		var marker = new google.maps.Marker({
-			draggable: true,
-			position: {
-				lat: mapCenterLat,
-				lng: mapCenterLng
-			},
-			map: map,
-			title: pinTitle
-		});
-
-		// When the pin is clicked, store the lat/lng
-		google.maps.event.addListener(marker, 'click', function(event) {
-			dataBox.value = '{"lat": "' + this.getPosition().lat() + '", "long": "' + this.getPosition().lng() + '"}';
-		});
-
-		// When the pin is dragged, store the lat/lng where it ends
-		google.maps.event.addListener(marker, 'dragend', function(event) {
-			dataBox.value = '{"lat": "' + this.getPosition().lat() + '", "long": "' + this.getPosition().lng() + '"}';
-		});
-	});
-
-});
+    try {
+        googleMapJS.addEventListener('load', function() {
+
+    		// Store the Google Map in a variable
+    		var map = new google.maps.Map(document.getElementById(mapID), {
+    			center: {
+    				lat: mapCenterLat,
+    				lng: mapCenterLng
+    			},
+    			zoom: mapZoom
+    		});
+
+    		// Create a new marker in the center of the map.
+    		var marker = new google.maps.Marker({
+    			draggable: true,
+    			position: {
+    				lat: mapCenterLat,
+    				lng: mapCenterLng
+    			},
+    			map: map,
+    			title: pinTitle
+    		});
+
+    		// When the pin is clicked, store the lat/lng
+    		google.maps.event.addListener(marker, 'click', function(event) {
+    			dataBox.value = '{"lat": "' + this.getPosition().lat() + '", "long": "' + this.getPosition().lng() + '"}';
+    		});
+
+    		// When the pin is dragged, store the lat/lng where it ends
+    		google.maps.event.addListener(marker, 'dragend', function(event) {
+    			dataBox.value = '{"lat": "' + this.getPosition().lat() + '", "long": "' + this.getPosition().lng() + '"}';
+    		});
+    	});
+    } catch (err) {
+        console.log("Unable to create event listener. Details: " + err);
+        alert("An error occurred with this question. Please contact the survey creator.");
+    }
+});