Javascript Reference - HTML DOM isId Property

The isId property returns true if the attribute is of type ID, otherwise it returns false.

Browser Support


`isId`	Yes	No	Yes	Yes	No

Syntax

attribute.isId

Return Value

A Boolean, true or false.

Example

The following code shows how to find out if an attribute is the element's ID attribute.


<!DOCTYPE html>
<html>
<body>
<!--   w w w .ja  v  a 2  s .  co m-->
<p id="demo">ID attribute</p>

<button onclick="myFunction()">test</button>

<script>
function myFunction() {
    var x = document.getElementById("demo");
    x.innerHTML = x.attributes[0].isId;
}
</script>


</body>
</html>

The code above is rendered as follows: