是否有可能获得鼠标位置与JavaScript页面加载后,没有任何鼠标移动事件(不移动鼠标)?
当前回答
最简单的解决方案,但不是100%准确
$(':hover').last().offset()
结果:{上:148,左:62.5} 结果取决于最近的元素大小,当用户切换选项卡时返回undefined
其他回答
真实的答案:不,这是不可能的。
OK, I have just thought of a way. Overlay your page with a div that covers the whole document. Inside that, create (say) 2,000 x 2,000 <a> elements (so that the :hover pseudo-class will work in IE 6, see), each 1 pixel in size. Create a CSS :hover rule for those <a> elements that changes a property (let's say font-family). In your load handler, cycle through each of the 4 million <a> elements, checking currentStyle / getComputedStyle() until you find the one with the hover font. Extrapolate back from this element to get the co-ordinates within the document.
N.b.,别这样。
重复@超新星的回答,这里有一个使用ES6类的方法,它在你的回调中保持正确的上下文:
class Mouse { constructor() { this.x = 0; this.y = 0; this.callbacks = { mouseenter: [], mousemove: [], }; } get xPos() { return this.x; } get yPos() { return this.y; } get position() { return `${this.x},${this.y}`; } addListener(type, callback) { document.addEventListener(type, this); // Pass `this` as the second arg to keep the context correct this.callbacks[type].push(callback); } // `handleEvent` is part of the browser's `EventListener` API. // https://developer.mozilla.org/en-US/docs/Web/API/EventListener/handleEvent handleEvent(event) { const isMousemove = event.type === 'mousemove'; const isMouseenter = event.type === 'mouseenter'; if (isMousemove || isMouseenter) { this.x = event.pageX; this.y = event.pageY; } this.callbacks[event.type].forEach((callback) => { callback(); }); } } const mouse = new Mouse(); mouse.addListener('mouseenter', () => console.log('mouseenter', mouse.position)); mouse.addListener('mousemove', () => console.log('mousemove A', mouse.position)); mouse.addListener('mousemove', () => console.log('mousemove B', mouse.position));
不是鼠标位置,但是,如果你正在寻找当前光标位置(用例,如获取最后键入的字符等),那么,下面的代码片段工作良好。 这将为您提供与文本内容相关的游标索引。
window.getSelection().getRangeAt(0).startOffset
是的,这是可能的。
如果你在文档中添加"mouseover"事件,它会立即触发,你可以得到鼠标的位置,当然,如果鼠标指针在文档上。
document.addEventListener('mouseover', setInitialMousePos, false);
function setInitialMousePos( event ) {
console.log( event.clientX, event.clientY);
document.removeEventListener('mouseover', setInitialMousePos, false);
}
以前可以通过窗口读取鼠标位置。事件,但现在已弃用。
我实现了一个水平/垂直搜索,(首先让一个div充满垂直排列的竖线链接,然后让一个div充满水平排列的竖线链接,然后简单地看看哪个有悬停状态),就像Tim Down上面的想法,它工作得相当快。遗憾的是,不工作在Chrome 32上的KDE。
jsfiddle.net/5XzeE/4/