Force the user to pick a fimrware before loading

_locales/en/messages.json

@@ -828,6 +828,9 @@
     "firmwareFlasherFlashSlowlyDescription": {
         "message": "Use 115200 baudrate for flashing (useful for flashing via bluetooth)"
     },
+    "firmwareFlasherOptionLabelSelectFirmware": {
+        "message": "Choose a Firmware / Board"
+    },
     "firmwareFlasherButtonLoadLocal": {
         "message": "Load Firmware [Local]"
     },

tabs/firmware_flasher.css

@@ -71,7 +71,7 @@
     margin-left: 6px;
 }
 .tab-firmware_flasher .options select {
-    width: 180px;
+    width: 280px;
     height: 20px;
 
     border: 1px solid silver;
@@ -82,7 +82,7 @@
 }
 .tab-firmware_flasher .options .description {
     position: absolute;
-    left: 200px;
+    left: 300px;
 
     font-style: italic;
     color: #818181;
@@ -194,6 +194,13 @@
     cursor: default;
     background-color: #b8b8b8;
 }
+.tab-firmware_flasher .buttons a.load_remote_file.locked {
+    background-color: #b8b8b8;
+}
+.tab-firmware_flasher .buttons a.load_remote_file.locked:hover {
+    cursor: default;
+    background-color: #b8b8b8;
+}
 .tab-firmware_flasher .buttons a.back {
     float: right;
     margin: 0;

tabs/firmware_flasher.html

@@ -69,7 +69,7 @@
     </div>
     <div class="buttons">
         <a class="load_file" href="#" i18n="firmwareFlasherButtonLoadLocal"></a>
-        <a class="load_remote_file" href="#" i18n="firmwareFlasherButtonLoadOnline"></a>
+        <a class="load_remote_file locked" href="#" i18n="firmwareFlasherButtonLoadOnline"></a>
         <a class="flash_firmware locked" href="#" i18n="firmwareFlasherFlashFirmware"></a>
         <a class="back" href="#" i18n="firmwareFlasherButtonLeave"></a>
     </div>

tabs/firmware_flasher.js

@@ -32,6 +32,8 @@ TABS.firmware_flasher.initialize = function (callback) {
         var processReleases = function (releases){
             var releases_e = $('select[name="release"]').empty();
 
+            releases_e.append($("<option value='0'>{0}</option>".format(chrome.i18n.getMessage('firmwareFlasherOptionLabelSelectFirmware'))));
+
             for(var releaseIndex = 0; releaseIndex < releases.length; releaseIndex++){
                 $.get(releases[releaseIndex].assets_url).done(
                     (function (releases, releaseIndex, releases_e, assets){
@@ -207,7 +209,25 @@ TABS.firmware_flasher.initialize = function (callback) {
             });
         });
 
-        $('a.load_remote_file').click(function () {
+        /**
+         * Lock / Unlock the firmware download button according to the firmware selection dropdown.
+         */
+        $('select[name="release"]').change(function(evt){
+            if (evt.target.value=="0") {
+                $("a.load_remote_file").addClass('locked');
+            }
+            else {
+                $("a.load_remote_file").removeClass('locked');
+            }
+        });
+        
+        $('a.load_remote_file').click(function (evt) {
+
+            if ($('select[name="release"]').val() == "0") {
+                GUI.log("<b>No firmware selected to load</b>");
+                return;
+            }
+
             function process_hex(data, summary) {
                 intel_hex = data;