HTML5设置javascript中的音频源不起作用 [英] HTML5 setting audio source in javascript not working

问题描述

由于HTML5浏览器格式的技巧，我必须将音频格式也采用备用音频格式。我想以编程方式设置音频源的src，但它不起作用。

Due to HTML5 browser formats tricks I have to put fallback audio formats also in audio format. I want to set the src of source in audio programmatically but it is not working.

这是我的HTML代码：

This is my HTML code:

<audio id="audioPlayer" width="400" height="30" controls="controls">        
    <source id="oggSource" type="audio/ogg" />
    <source id="mp3Source" type="audio/mp3" />
</audio>

然后在javascript中使用jquery我为每个人设置了源码（我有一个音频标签和许多在页面上的MP3和基于一些事件我想改变音频标签的来源），所以我不能直接在音频中指定src，主要是因为我需要后备支持，并且我还需要活力。

Then in javascript using jquery I set the source for each of them (I have one audio tag and many mp3 on page and based on some event I want to change the source of audio tag) so I can't specify src directly in audio mainly because I need fallback support and also I need dynamism.

使用jquery我操纵src：

Using jquery I manipulate the src:

$('#oggSource').attr('src', 'OggFormat.ogg');
$('#mp3Source').attr('src','Mp3Format.mp3');

但这是行不通的。知道为什么吗？

But this however doesn't work. Any idea why?

如果我使用：

<audio id="audioPlayer" width="400" height="30" controls="controls">        
    <source id="oggSource" type="audio/ogg" src="OggFormat.ogg" />
    <source id="mp3Source" type="audio/mp3" src="Mp3Format.mp3"/>
</audio>

它有效但我需要在代码中设置它而不是静态提供。

it works but as I need I need to set it in code and not provide statically.

推荐答案

使用 .detach（）。appendTo（parent）似乎有效：< a href =http://jsfiddle.net/pimvdb/b7Jgh/ =noreferrer> http://jsfiddle.net/pimvdb/b7Jgh/ 。

Using .detach().appendTo(parent) seems to work: http://jsfiddle.net/pimvdb/b7Jgh/.

$("#oggSource").attr("src", "foo.ogg").detach().appendTo("#audioPlayer");

我猜浏览器只会开始加载（并且在玩 autoplay < source> 元素被添加，而不是刚刚修改时，我不确定为什么，但在分离后附加它。

I guess the browser only starts loading (and playing with autoplay) if a <source> element is added, not when it is just modified. I'm not sure why though, but appending it after detaching works.

编辑：你也可以直接使用 .appendTo ，因为一个元素是唯一的（即它必须被分离）： http://jsfiddle.net/pimvdb/b7Jgh/6/ 。

You can also directly do .appendTo since an element is unique (i.e. it has to be detached anyway): http://jsfiddle.net/pimvdb/b7Jgh/6/.

function updateSource(source, src) {
    source = $(source);
    source.attr("src", src).appendTo(source.parent());
}

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