JQuery autoplay video

问题

Hi I have some very basic html for a video:

<div class="video_holder">
      <video id="video_player" controls="controls" poster=""> 
        <source id="video_mp4" src="" type='video/mp4; codecs="avc1.42E01E, mp4a.40.2"' />
      </video>
</div>

in my js:

 function playFile(e) {
      ...
      e.preventDefault()
      var selected = $(this);
      var path = selected.attr('href');
      $("#video_mp4").attr('src', path);
      // how do I get this thing to auto-play?????
  };

This works great for injecting the correct path into the src attribute, and I have verified the path is correct and accessible. However, I cannot get the video to autoplay on load.

I have tried:

document.getElementById("video_player").play();

$('#video_player').trigger('play');

$('#video_player').play();

How can I trigger the video to autoplay?

Any help much appreciated.

回答1:

You can use:

$("#video_player")[0].play();

Or:

$("#video_player")[0].autoplay = true;

Or:

document.getElementById("video_player").setAttribute('autoplay', true);

Whatever suits you. Using $('#video_player').play(); you are referencing to non-existing method play in jQuery and you should reference to the object found by $("#video_player").

To change the src of the video in JS, you just simply need something like that:

function playFile() {
    var video = $("#video_player");
    video[0].src = "http://www.yoursrc.com/video_new.mp4";
    video[0].load();
    video[0].play();
};

---

NOTE:
In Chrome, you should also need to add muted property if you want to use the autoplay attribute. Refer to : https://developers.google.com/web/updates/2017/09/autoplay-policy-changes

回答2:

Please check this simple step, This works well for me

$('video').trigger('play');

Thanks

回答3:

Here is an example of a video that will cover the whole window and autoplay, on a loop. It's created on demand via JavaScript.

I needed this for a video that should only load and play when requested, i.e. not on every load of the page. (Hiding the element with display: none; won't do, because the video then still loads even if not displayed.)

JavaScript

/**
 * Create the video.
 *
 * An alternative might have been to use an HTML template tag inside the Twig template,
 * to then create an element and append it. But this worked only in Chrome:
 * - in Firefox, `autoplay loop muted` (inside the <template>) get converted to
 *   `autoplay="" loop="" muted=""` (in the Inspector) and there's no playback.
 * - in Safari, nothing happens.
 *
 * Another alternative (that worked this one) is to just append the whole HTML as a
 * single string, but it's harder to read.
 */
var video = $('<video />', {
    id: 'video',
    class: 'myclass',
    poster: 'https://path/to/my/poster.jpg'
}).prop({
    muted: true,
    autoplay: true,
    loop: true,
});
var src1 = $('<source />', {
    type: 'video/webm', // for Firefox, Chrome; slightly smaller file size
    src: 'https://path/to/my/video.webm'
}).appendTo(video);
var src2 = $('<source />', {
    type: 'video/mp4', // for Safari, Firefox, Chrome
    src: 'https://path/to/my/video.mp4'
}).appendTo(video);
video.appendTo($('body'));

Note that:

• muted, autoplay, loop must go inside of prop(). Setting them as attributes will not work! (And will be quite misleading, because you'd think you set them when in fact you really haven't.)
• muted is needed in Chrome for autoplay to work.
• A simple way to create the poster: open the video with VLC, take a Snapshot, converted the resulting PNG to JPG.
• Make sure the video is properly converted. Not all MP4 files will work in the browser. This proved useful: Video conversion with FFmpeg (for the Web).

The hard-to-read-alternative mentioned above:

$('body').append('<video class="c-congrats  c-congrats--outofnew" autoplay loop muted> <source src="https://path/to/my/video.webm" type="video/webm" /> <source src="https://path/to/my/video.mp4" type="video/mp4" /> Your browser does not support the video tag. </video>')

CSS

.myclass {
    position: fixed;
    z-index: -1;
    height: 100vh;
    top: 0;
    left: 0;
}

来源：https://stackoverflow.com/questions/15124438/jquery-autoplay-video