JavaScript DHTML/Language Basics/Stack
Pushing, Popping, and Displaying the Contents of a Stack
<source lang="html4strict">
<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 "Empty stack!";
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>
</source>
Simple Stack Example
<source lang="html4strict">
<HTML> <HEAD> <TITLE> Simple Stack Example </TITLE> </HEAD> <BODY>
<SCRIPT>
var stack = new Array();
stack.push("Me", "Two");
for (var i = 0; i < stack.length; i++){
document.write(stack[i] + "
");
}
document.write (stack.pop() + "
");
for (var i = 0; i < stack.length; i++){
document.write(stack[i] + "
");
}
</SCRIPT>
</BODY> </HTML>
</source>
