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element-height-observer
Advanced tools
element-height-observer
Allows you to add an efficient height listener to any dom element and execute a callback when its height changes
Element height observer
This library allows you to add an observer for page or element height. Each time the page changes height, a callback will be called.
No dependencies, total library minified is less than 0.9 KB
Install
npm install element-height-observer --save
Use
Load the script:
<html>
<head>
<script src="node_modules/element-height-observer/dist/index.js"></script>
</head>
</html>
Or import it:
var heightObserver = require('element-height-observer');
var registerHeightObserver = heightObserver.registerHeightObserver;
var unregisterHeightObserver = heightObserver.unregisterHeightObserver;
Or import it (ES6 modules notation):
import { registerHeightObserver, unregisterHeightObserver } from 'element-height-observer';
When the page has loaded, you can register the observer like this:
window.addEventListener('load', function () {
var someElement = document.querySelector('#someElementId');
registerHeightObserver(someElement, function () {
// Your code that you want to execute when the element changes height
})
});
You can only add one listener per element, otherwise the unregister mechanism won't work correctly.
var someElement = document.querySelector('#someElementId');
unregisterHeightObserver(someElement);
API
There are 2 functions available:
- registerHeightObserver(elementToWatch, options?, callback)
- unregisterHeightObserver(elementToStopWatching)
The options are optional and can currently only specify which dimension of the element it should watch for:
direction: 'horizontal' | 'vertical' | 'both'
The default is 'vertical'
The callback doesn't get passed any parameters:
callback: () => void
Inspiration
This library is inspired by a stackoverflow post by Jake
FAQs
Allows you to add an efficient height listener to any dom element and execute a callback when its height changes
We found that element-height-observer demonstrated a not healthy version release cadence and project activity because the last version was released a year ago. It has 1 open source maintainer collaborating on the project.
Package last updated on 30 Apr 2018
Did you know?
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