Javascript DOM HTML Attribute specified Property

Introduction

Find out if an attribute has been specified or not: 

var x = document.getElementById("demo").attributes[0].specified;

Click the button find out if the button has an onclick attribute specified.

View in separate window 

<!DOCTYPE html>
<html>
<body>
<button onclick="myFunction()">Test</button>

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

<script>
function myFunction() {//from w  w w  .  j  a  v  a2  s.com
  var btn = document.getElementsByTagName("BUTTON")[0];
  var x = btn.getAttributeNode("onclick").specified;
  document.getElementById("demo").innerHTML = x;
}
</script>

</body>
</html>

The specified property returns true if the attribute is specified or if the attribute has been created but not been attached to an element yet.

Otherwise it returns false.




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