javascript - How to detect Backbone.History referer (history length) -

i'm developing backbone application multiple views, collections, etc.. has router handles permanent url pretty well.

what i'm trying achieve creating "back" button allows user go window.history(-1) previous view when available (user came view earlier). , if not, "back" button lead home page.

basically need check whether or not backbone has saved in history can use roll 1 step. if history empty (we navigated url directly) point main router.

i tried using window.hisory.length never empty. may still point starting homepage of browser or browser's blank opening page.

does backbone.history keeps track of urls (hashes) passes through it? if - how access it. tried console logging backbone.history found nothing can hold on to.

any / advise appreciated.

you can following:

router initialise function -

this.on("all", this.storeroute); this.history = []; 

then storeroute function (also in router) -

storeroute: function() {     return this.history.push(backbone.history.fragment); } 

the in router -

previous: function(){     if (this.history.length > 1) {       return this.navigate(this.history[this.history.length - 2], true);     } } 

so, can call yourapp.router.previous() @ time!