Issue 2844 - cosmetic fixes and adjustments to ABP for Microsoft Edge subscription page

static/js/index.js

 (function()
 {
   function addListener(obj, type, listener, useCapture)
   {
     if ("addEventListener" in obj)
     {
       obj.addEventListener(type, function(ev)
       {
         if (listener(ev) === false)
           ev.preventDefault();
@@ skipping 28 matching lines @@
   }
 
   function getPlaceholderText(textbox)
   {
     return textbox.getAttribute("placeholder");
   }
 
   function initSubscriptionForm(subscriptionElement)
   {
     var emailTextbox = subscriptionElement.querySelectorAll(".subscribe-textbox")[0];
+    var reset = subscriptionElement.querySelectorAll(".reset-form")[0];
 
     // IE9 + Safari iOS
     if (!("placeholder" in document.createElement("input"))
         && !emailTextbox.value)
     {
       addPlaceholder(emailTextbox);
       addListener(emailTextbox, "focus", function()
       {
         if (emailTextbox.value == getPlaceholderText(emailTextbox))
         {
@@ skipping 49 matching lines @@
             else // IE8
               errorWrapper.innerText = request.statusText;
 
             formElement.setAttribute("class", "error");
           }
         }
       }, false);
       request.send(params);
       return false;
     }, false);
+
+    addListener(reset, "click", function()
+    {
+      formElement.removeAttribute("class");
+      return false;
+    }, false);
   }
 
   var visibleTab;
   var container;
 
   window.toggleMore = function()
   {
     if (container.className == "hidden")
       container.className = visibleTab || getDefaultTab();
     else
@@ skipping 16 matching lines @@
   }
 
   function init()
   {
     container = document.getElementById("more-container");
     initSubscriptionForm(document.getElementById("edge-subscription"));
   }
 
   init();
 })();