Question

I have an application which creates and manages activities. I use Knockout.js to hold activities in observable array. Whenever new activity is created it is inserted into an array. One of the activity properties is date. I want to order activities by date after creating new one, to display it properly in UI. This is a function I use for it:

self.Activities.unshift(activity);
self.Activities.sort(function(a, b) {
    var dateA = new Date(a.date() + " 00:00:00");
    var dateB = new Date(b.date() + " 00:00:00");
    return dateA > dateB;
});

And it works perfectly in Firefox (v 16.0.2) but doesn’t work in Chrome (v 23.0.1…), Safari or IE

Why? What is the workaround? If any?

Answer 1

The comparer function that you pass needs to sort needs to return a number. Some browsers are forgiving and work with a boolean.

Generally you would return -1 or 1. Something like:

return dateA > dateB ? 1 : -1;