Window top Property - Javascript Browser Object Model

Javascript examples for Browser Object Model:Window top

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Description

The top property returns the topmost browser window of the current window.

This property is read-only.

Return Value

A reference to the topmost window in the window hierarchy

Demo Code

ResultView the demo in separate window 

<!DOCTYPE html>
<html>
<head>
<script>
function myFunction() {//from w  w  w  .  j a  va2s .  c  o  m
    if (window.top != window.self)  {
        document.getElementById("demo").innerHTML = "This window is not the topmost window! Am I in a frame?";
    } else {
        document.getElementById("demo").innerHTML = "This window is the topmost window!";
    }
}
</script>
</head>
<body>

<button onclick="myFunction()">Check window</button>

<p id="demo"></p>

</body>
</html>

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