Push form value to a stack in JavaScript

Description

The following code shows how to push form value to a stack.

Example


<!--   ww  w  .j  a v  a2  s.  c  o  m-->
<!DOCTYPE html>
<html>
<head>
<script type="text/javascript">
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>

Click to view the demo

The code above generates the following result.

Push form value to a stack in JavaScript

Home »
  Javascript Tutorial »
    Data Type »
      Array

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