JavaScript node.compareDocumentPosition() Method
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JavaScript node.compareDocumentPosition() Method
The node.compareDocumentPosition() method compares two given nodes, and returns an integer describing where they are positioned in the document.
Example
HTML Online Editor
<!DOCTYPE html>
<html>
<body>
<p id="point1">I'm paragraph 1</p>
<p id="point2">I'm paragraph 2</p>
<button onclick="myFunction()">Click Me</button>
<script>
var p1 = document.getElementById("point1");
var p2 = document.getElementById("point2");
function myFunction(){
alert(p1.compareDocumentPosition(p2));
}
</script>
</body>
</html>
Syntax
node.compareDocumentPosition(otherNode)
Parameter Values
| Value | Type | Explanation |
|---|---|---|
| otherNode | Required | The other Node with which to compare document positioning. |
Return Values
| Value | Explanation |
|---|---|
| 0 | p1 and p2 are same element. |
| 1 | p1 and p2 do not belong to the same document. |
| 2 | p1 is positioned after p2. |
| 4 | p1 is positioned before p2. |
| 8 | p1 is positioned inside p2. |
| 16 | p2 is positioned inside p1. |
| 32 | p1 and p2 has no relationship. |
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