Remove alerts only during load - put them back in to allow user to in…

…teract and get alerts. Fixes #148

index.php

@@ -132,8 +132,7 @@
         <strong>Output</strong>
         <span class="options">
           <button id="runwithalerts" title="ctrl + enter
-Include alerts, prompts &amp; confirm boxes">Run JavaScript</button>
-          <label>Always run JS<input type="checkbox" id="enablejs"></label>
+Include alerts, prompts &amp; confirm boxes">Run JS with alerts</button> <label>Always run JS<input type="checkbox" id="enablejs"></label>
         </span>
       </div>
     </div>

js/render/live.js

@@ -1,7 +1,9 @@
 var $live = $('#live'),
     $body = $('body'),
     showlive = $('#showlive')[0],
-    throttledPreview = throttle(renderLivePreview, 200);
+    throttledPreview = throttle(renderLivePreview, 200),
+    killAlerts = '<script>try{window.print=function(){};window.alert=function(){};window.prompt=function(){};window.confirm=function(){};}catch(e){}</script>',
+    restoreAlerts = '<script>try{delete window.print;delete window.alert;delete window.prompt;delete window.confirm;}catch(e){}</script>';
 
 var iframedelay = (function () {
   var iframedelay = { active : false },
@@ -69,9 +71,9 @@ function renderLivePreview(withalerts) {
       // nullify the blocking functions
       // IE requires that this is done in the script, rather than off the window object outside of the doc.write
       if (withalerts !== true) {
-        doc.write('<script>try{window.print=function(){};window.alert=function(){};window.prompt=function(){};window.confirm=function(){};}catch(e){}</script>');
+        doc.write(killAlerts);
       } else {
-        doc.write('<script>try{delete window.print;delete window.alert;delete window.prompt;delete window.confirm;}catch(e){}</script>');
+        doc.write(restoreAlerts);
       }
 
       if (jsbinConsole) {
@@ -101,6 +103,7 @@ function renderLivePreview(withalerts) {
       };
 
       doc.write(source);
+      doc.write(restoreAlerts);
     }
     doc.close();
     delete jsbin.panels.panels.live.doc;