Push form value to a stack

Push form value to a stack : Stack : Array JAVASCRIPT TUTORIALS

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Push form value to a stack



<HTML>
<HEAD>
<TITLE>Stacking up!</TITLE>
<SCRIPT>
var stack = new Array(); 

function pushStack(newVal) {
   stack.push(newVal);
}

function popStack() {
   var popVal = stack.pop();
   if (popVal == undefined)
      return "Nothing left!";
   else
   return popVal;
}

function showStack(theSelect){
   theSelect.options.length = 0;
   for (var i = 0; i < stack.length; i++){
      var theOption = new Option(stack[i]);
      theSelect.options[theSelect.options.length] = theOption;
   }
}
</SCRIPT>
</HEAD>
<BODY>
<FORM>
<INPUT type=text name=txtPush>
<INPUT type=button value="Push" onClick='pushStack(txtPush.value);txtPush.value=""; showStack(theList);'>
<SELECT name="theList" size=12>
<OPTION>Displays the current state of the stack!
</SELECT>
<INPUT type=text name=txtPop size=25>
<INPUT type=button value="Pop" onClick="txtPop.value = popStack();showStack(theList);">
</FORM>
</BODY>
</HTML>