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I want a callback that is executed after an <applet> element is loaded:

// Create element
var $applet = $("<applet></applet>");

// Attach handler
$applet.load(function() {
    alert('applet loaded');
});

// Set attributes
$applet.attr({
    style: 'position:absolute;left:-1px',
    name: 'TiddlySaver',
    code: 'TiddlySaver.class',
    archive: 'TiddlySaver.jar',
    width:'1',
    height:'1',
});

Why is the 'load' event handler not executed for an <applet> element? If I change the <applet> to an <img> element (with valid src attribute) the handler is executed.

According to the HTML 4.01 (which is the fundamental standard for web pages), only two elements have an onload attribute: body and frameset. Some other elements also support it as a proprietary extension (image is fairly common), but you should not expect any other element to do so.

HTML5 requires all HTML elements (except body, which is peculiar) to support a load event, but you can't depend on it being widely or fully implemented yet (if ever).

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2 回答 2

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根据 HTML 4.01（这是网页的基本标准），只有两个元素具有 onload 属性：body 和 frameset。其他一些元素也支持它作为专有扩展（图像相当常见），但您不应该期望任何其他元素这样做。

HTML5 要求所有 HTML 元素（除了 body，它是特殊的）来支持加载事件，但你不能依赖它被广泛或完全实现（如果有的话）。

于 2011-05-08T11:43:23.310 回答
1

From the jQuery documentation:

This event can be sent to any element associated with a URL: images, scripts, frames, iframes, and the window object.

That might be the reason why.

于 2011-05-08T12:09:29.613 回答