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👁️‍ TrackChanges.js

Library for tracking changes in any data type

• support browser and node-js
• uses global space, you can control observers from any file
• does not load, uses 1 global loop
• easy to use and can be a replacement for MutationObserver in the browser

Installation for node-js

npm i track-changes-js --save-dev

Include the library in a file

// create a class object
const TrackChanges = require('track-changes-js');
const trackChanges = new TrackChanges();

Installation for browser

git clone https://github.com/itmor/trackChanges.js.git

cd build

include library file in HTML page

<script src="trackChanges.min.js"></script>

Include the library in a file

// create a class object
const trackChanges = new TrackChanges();

Usage example

// tracked variable
let num = 1;

// add an observer, pass the name and function that returns the variable
trackChanges.addObserver('numObserv', () => num);

// add a handler, pass the name and function that will be called when changing "num"
trackChanges.addHandler('numObserv', numHandler);

/** 
create a function that will be called when the variable changes, the function argument will be its changed value 
**/
function numHandler(modifiedResult) {
  console.log(`Num changed to: ${ modifiedResult }`);
}

Importantly

Each observer must have a unique name.
You can create an unlimited number of observer handlers

Description of public methods

| methods | description| | ------------ | ------------ | | addObserver(name: string, valueFunc: function)|The method creates an observer, takes a unique name and a function for returning the observed value | | removeObserver(name: string)|The method removes the observer, accepts the name of the previously created observation| | addHandler(name: string, callback: function)|The method adds a handler for the observer. Accepts the name of the previously created observer and callback function. When the callback value is changed, the callback function is launched and its argument will be equal to the changed value| | removeHandler(name: string, callback: function)|The method removes the handler for the observer. Accepts the observer name and callback function that was used when adding the handler| | getObserverStruct(name: string)|With this method you can get the observer structure, output data { name: string; value: function; oldValue: any; removed: boolean; callbacks: Array}| | getAllObserversStruct()|With this method you can get the structure in all available observers, output data Array<{ name: string; value: function; oldValue: any; removed: boolean; callbacks: Array}>|

Dev

Establish dependency

npm i

Run assembly processing

npm run start