Javascript notation

Question

I came upon a notation I'm not too familiar with and would like some direction to where to look.

the notation is "selector event" : function() {}

so for example

".elementClass change" : function() {}

It's just a key pointing to a function. It's not special. Is this in Backbone? — alex
– alex, Commented Apr 5, 2013 at 5:20
Backbone.js uses something like this: backbonejs.org/#View-delegateEvents — msapkal
– msapkal, Commented Apr 5, 2013 at 5:22
It could be a simple conditional condition ? true_expr : false_expr syntax that gives you string if true, and an empty function otherwise. — gerrytan
– gerrytan, Commented Apr 5, 2013 at 5:23
Looks like Backbone.js to me, except that backbone syntax is "event selector": function(){} — Simon Robb
– Simon Robb, Commented Apr 5, 2013 at 5:23

Konstantin Dinev · Accepted Answer · 2013-04-05 09:06:52Z

1

This notation is for a key-value pair within an object. The specific example is for a function value belonging to a selector and event key. The function is then accessible using the key:

var obj = {
    ".elementClass change": function () {}
};
var func = obj[".elementClass change"];

edited Apr 5, 2013 at 9:06

answered Apr 5, 2013 at 5:24

Konstantin Dinev

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2 Comments

Will Huang Over a year ago

Found the notation in javascriptmvc. Thanks for the explanation on key-value pairs in javascript. I'm sure jmvc is using it for the event listeners.

Konstantin Dinev Over a year ago

@WillHuang Yup it parses the key finds the elements that match the selector and attach event listeners for the event.

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