Html 如何使 HTML5 中的 <div> 可在 Firefox 中拖动？
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How to make <div>s in HTML5 draggable for Firefox?
提问by HdM
I am playing around with the HTML5 features, and I want div's (and similar containers like articles, sections, etc.) to be draggable. Consider the following code:
我正在尝试使用 HTML5 功能，并且我希望 div（以及类似的容器，如文章、部分等）是可拖动的。考虑以下代码：
<!DOCTYPE html>
<html>
<head>
<title>A Simple Draggable Object</title>
</head>
<body>
<h1>Test #1: A Simple Draggable Object</h1>
<div draggable="true">This text should be draggable.</div>
</body>
</html>
I tested in OS X the following browsers: In Chrome 7.0 and Safari 5.0.2 I can successfully drag the text around, but in Firefox 3.6 and 4.0b6 I can neither drag the text nor mark it (as if it was usual text). Is this a bug or a feature? How do I achieve that Firefox lets me drag around these tags withoutusing jQuery ?
我在 OS X 中测试了以下浏览器： 在 Chrome 7.0 和 Safari 5.0.2 中，我可以成功地拖动文本，但在 Firefox 3.6 和 4.0b6 中，我既不能拖动文本，也不能对其进行标记（就好像它是普通文本一样）。这是错误还是功能？我如何实现 Firefox 让我在不使用 jQuery 的情况下拖动这些标签？
回答by Skilldrick
According to HTML5 Doctor, this won't work in Firefox without some JS help.
根据HTML5 Doctor，如果没有一些 JS 帮助，这将无法在 Firefox 中工作。
The HTML 5 spec says it should be as simple as adding the following attributes to the markup of the elements in question:
draggable="true"However, this doesn't work completely for Safari or Firefox. For Safari you need to add the following style to the element:
[draggable=true] { -khtml-user-drag: element; }This will start working in Safari, and as you drag it will set a default, empty value with the dataTransfer object. However, Firefox won't allow you to drag the element unless you manually set some data to go with it. To solve this, we need a dragstart event handler, and we'll give it some data to be dragged around with:
var dragItems = document.querySelectorAll('[draggable=true]'); for (var i = 0; i < dragItems.length; i++) { addEvent(dragItems[i], 'dragstart', function (event) { // store the ID of the element, and collect it on the drop later on event.dataTransfer.setData('Text', this.id); }); }
HTML 5 规范说它应该像将以下属性添加到相关元素的标记一样简单：
draggable="true"但是，这并不完全适用于 Safari 或 Firefox。对于 Safari，您需要向元素添加以下样式：
[draggable=true] { -khtml-user-drag: element; }这将在 Safari 中开始工作，当您拖动它时，它将使用 dataTransfer 对象设置一个默认的空值。但是，Firefox 不允许您拖动元素，除非您手动设置一些数据以配合它。为了解决这个问题，我们需要一个 dragstart 事件处理程序，我们将给它一些要拖动的数据：
var dragItems = document.querySelectorAll('[draggable=true]'); for (var i = 0; i < dragItems.length; i++) { addEvent(dragItems[i], 'dragstart', function (event) { // store the ID of the element, and collect it on the drop later on event.dataTransfer.setData('Text', this.id); }); }
