Question

I can’t seem to access the window.history.state object when my popState is triggered in Safari 5 (the page goes back). This code works perfectly in Chrome 19 and Firefox 12.

window.onload = function() {

     window.setTimeout(function() {

          var original = window.location.href;

          window.addEventListener("popstate", function(e) {

                    if (window.history.state !== null) {
                        var type = window.history.state.type;
                        var page = window.history.state.page;
                        //custom Ajax function below
                        getContent({type:type, page:page, category: category}, '/' + type + '/' + page);
                    } else {
                        window.location = original;
                    }

            }, false);

     }, 1);
}

console.log(window.history.state) in Safari 5 returns ‘undefined’.

Answer 1

window.history.state is only available in some browsers. It’s not part of the spec per se.

Feature           │ Chrome  │ Firefox (Gecko)  │  IE  │ Opera  │ Safari
──────────────────┼─────────┼──────────────────┼──────┼────────┼───────
replace/pushState │   5     │    4.0 (2.0)     │  10  │ 11.50  │  5.0
history.state     │  18     │    4.0 (2.0)     │  10  │ 11.50  │  ---