1 files changed, 48 insertions, 25 deletions
diff --git a/dingus.html b/dingus.html
index 73c294f..40664d2 100644
--- a/dingus.html
+++ b/dingus.html
@@ -12,37 +12,55 @@
 var writer = new commonmark.HtmlRenderer();
 var reader = new commonmark.DocParser();
 
-function getQueryVariable(variable)
-{
-       var query = window.location.search.substring(1);
-       var vars = query.split("&");
-       for (var i=0;i<vars.length;i++) {
-               var pair = vars[i].split("=");
-               if(pair[0] == variable){return decodeURIComponent(pair[1]);}
-       }
-       return null;
+function getQueryVariable(variable) {
+  var query = window.location.search.substring(1);
+  var vars = query.split("&");
+  for (var i=0; i<vars.length; i++) {
+    var pair = vars[i].split("=");
+    if (pair[0] == variable){
+      return decodeURIComponent(pair[1]);
+    }
+  }
+  return null;
 }
 
+// via http://stackoverflow.com/questions/499126/jquery-set-cursor-position-in-text-area
+function setSelectionRange(input, selectionStart, selectionEnd) {
+  if (input.setSelectionRange) {
+    input.focus();
+    input.setSelectionRange(selectionStart, selectionEnd);
+  }
+  else if (input.createTextRange) {
+    var range = input.createTextRange();
+    range.collapse(true);
+    range.moveEnd('character', selectionEnd);
+    range.moveStart('character', selectionStart);
+    range.select();
+  }
+}
+// via http://stackoverflow.com/questions/499126/jquery-set-cursor-position-in-text-area
+function setCaretToPos(input, pos) {
+  setSelectionRange(input, pos, pos);
+}
 
 $(document).ready(function() {
   var timer;
   var x;
   var parsed;
   var render = function() {
-      if (parsed === undefined) {
-        return;
-      }
-      var startTime = new Date().getTime();
-      var result = writer.renderBlock(parsed);
-      var endTime = new Date().getTime();
-      var renderTime = endTime - startTime;
-      // $("#html").text(result);
-      $("#preview").html(result);
-      $("#html").text(result);
-      $("#ast").text(commonmark.ASTRenderer(parsed));
-      $("#rendertime").text(renderTime);
+    if (parsed === undefined) {
+      return;
+    }
+    var startTime = new Date().getTime();
+    var result = writer.renderBlock(parsed);
+    var endTime = new Date().getTime();
+    var renderTime = endTime - startTime;
+    $("#preview").html(result);
+    $("#html").text(result);
+    $("#ast").text(commonmark.ASTRenderer(parsed));
+    $("#rendertime").text(renderTime);
   };
-  var parseAndRender = function () {
+  var parseAndRender = function() {
     if (x) { x.abort() } // If there is an existing XHR, abort it.
     clearTimeout(timer); // Clear the timer so we don't end up with dupes.
     timer = setTimeout(function() { // assign timer a new timeout
@@ -71,10 +89,16 @@ $(document).ready(function() {
     $('#result-tabs a[href="#result"]').tab('show');
   }
   // make tab insert a tab in the text box:
-  $("#text").keydown(function (e) {
+  $("#text").keydown(function(e) {
     if (e.which == 9) {
-        e.preventDefault();
+      e.preventDefault();
+      if (this.selectionStart !== undefined) {
+        var pos = this.selectionStart;
+        this.value = this.value.substring(0, pos) + "\t" + this.value.substring(pos);
+        setCaretToPos(this, pos + 1);
+      } else {
         this.value += "\t";
+      }
     }
   });
   parseAndRender();
@@ -143,7 +167,6 @@ $(document).ready(function() {
         <div id="result-ast" class="tab-pane">
           <pre id="astpre"><code id="ast"></code></pre>
         </div>
-      </div>
     </div>
   </div>
 </div>