接收来自多个HTML5视频的事件

Question

I have multiple videos and want to get an event from all of them. But I get only the event from one of them (tested in Chrome). Why?

HTML:

<video id="video1" preload="auto" src="video1.ogg"></video>
<video id="video2" preload="auto" src="video2.ogg"></video>

JS:

$('video').on('canplay', function(){
    console.log($(this).attr('id'));
});

jsFiddle

EDIT:

Ok.. it is really strange. On the very first load I get sometimes both events. But after that on every reload I get just an event from one of them!? Here a screenshot of my console:

Answer 1

The problem is that the 'canplay' event has already fired by the time you register it. I believe this is because jsFiddle wraps your code inside of $(window).load(... . If you were to move the script into the html, like on this example , it should work.

Most of the time, if you know for sure that your script is going to run synchronously right after the video element is created with a src , you can assume that none of those events have been fired. But, just to be safe, and especially when you don't know how your code will be used, I recommend something like this:

function handleCanplay(video) {
    console.log($(video).attr('id'));
};

$('video').each(function () {
    //first, check if we missed the 'canplay' event
    if (this.readyState >= this.HAVE_FUTURE_DATA) {
        //yup, we missed it, so run this immediately.
        handleCanplay(this);
    } else {
        //no, we didn't miss it, so listen for it
        $(this).on('canplay', function () {
            handleCanplay(this);
        });
    }
});

Working example here .