watch the changes of some object or attribute

README.md

Watch.js

WOW! WatchJS became so popular that I've been pushed to migrate it to GitHub

https://github.com/melanke/Watch.JS

Just kidding

It is not that obvious from the readme that watchAll only watches for properties that were defined at the moment of call to watchAll.

E.g.

var obj = {
    attr1: 0,
};

ex3.watch(function(){
    alert("Something was changed");
});

ex3.attr0 = 1; //triggers the observer; the alert is shown.
ex3.attr1 = 1; //does not trigger the observer; the alert is not shown.

@penartur it is explained in the paragraph "Chill out, no surprises, new attributes will not be considered"

This is really useful. Thanks. One question: when watching more than one properties, is there a way to see what and how it was changed? i.e.:

o.watch(["x","y","z"], function (id, oldval, newval) {
console.log( "o." + id + " changed from " + oldval + " to " + newval );
});

With the new version of Watch.JS it is possible

Here is a sample:
http://jsfiddle.net/XnbXS/1/

Read the short-full-documentation:
https://github.com/melanke/Watch.JS