- Tags: JS DOM, JS DOM Element
- Categories: JavaScript Methods, JavaScript Reference, Reference
Quick Reference
The Element compareDocumentPosition() method compares two nodes, and returns an integer describing where they are positioned in the document.
<p id="paragraph1">This is a paragraph</p>
<p id="paragraph2">This is another paragraph</p>
<!-- html element to place output -->
<p id="my_output"></p>
// variables
let p1 = document.getElementById('paragraph1').lastChild;
let p2 = document.getElementById('paragraph2').lastChild;
let my_position = p1.compareDocumentPosition(p2);
// output to the HTML element
document.getElementById('my_output').innerHTML = my_position;
Output
4
| Output | Meaning |
|---|---|
| 1 | The nodes do not belong to the same document |
| 2 | The first node is positioned after the second |
| 4 | The first node is positioned before the second |
| 8 | The first node is positioned inside the second |
| 16 | The second node is positioned inside the first |
| 32 | The nodes are attributes on the same element |
Syntax
node.compareDocumentPosition(node)
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JAVASCRIPT NOTES:
- When using JavaScript, single or double quotation marks are acceptable and work identically to one another; choose whichever you prefer, and stay consistent
- JavaScript is a case-sensitive language; firstName is NOT the same as firstname
- Arrays count starting from zero NOT one; so item 1 is position [0], item 2 is position [1], and item 3 is position [2] … and so on
- JavaScript variables must begin with a letter, $, or _
- JavaScript variables are case sensitive (x is not the same as X)
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