Variable Listener

Allows JavaScript to execute arbitrary functions when the value of any global variable changes.

Installation

To add Variable Listener to your site or project:

<script src="https://cdn.jsdelivr.net/npm/variable-listener@latest/dist/variable-listener.min.js"></script>

or

npm install variable-listener

import 'variable-listener';

Usage

Declare your global variable:

var count = 10;

Add a new listener:

window.addVariableListener('count', function (newValue) {

    console.log(newValue);

});

The callback will be triggered whenever your variable changes:

count++;

// Callback logs: 11

If you no longer want to listen to the variable, call:

window.removeVariableListener('count');