获取相对于 window (x,y) 的插入符位置坐标

Get caret position coordinates relative to the window (x,y)

摘要

我想获取插入符号(当用户开始输入时)的 window 位置(以像素为单位)。

全文

有一个多行 contentEditable 元素,其中包含复杂的 HTML 结构。
当用户 开始在其中的任何地方键入 时,在第一次击键时,我想在插入符号下方放置一个 absolute 定位元素。 必须新添加的元素会被注入到<body>标签中,不是作为DOM内的节点contentEditable 元素。

因此我需要插入符号的精确全局坐标。我会清楚没有文本选择。
选择在这里无关紧要,甚至不太可能。

我的代码

通常一个问题应该包括一些 OP 尝试过并需要帮助的代码,但在这种情况下我完全没有想法。 input DOM 事件 暴露坐标。我至少会提供我所追求的最终结果:

.info{
  border: 1px solid gold;
  padding: 8px;
  background: rgba(255,255,224, .8);
  position: absolute;
  z-index: 9999;
  max-width: 180px;
}
<h2>contentEditable:</h2>
<div contentEditable>
  <p>
    Lorem ipsum dolor sit amet, consectetur adipiscing elit, 
    sed do eiusmod tempor incididunt ut labore et dolore magna aliqua. 
    <strong>Ut enim ad minim veniam</strong>, 
    quis nostrud exercitation ullamco laboris nisi ut aliquip ex ea commodo consequat. 
  </p>

  <p>
    Imagine the caret is somewhere here and the info element is right under it... <div>reprehenderit <em>in</em> voluptate</div> 
    velit esse cillum dolore eu fugiat nulla pariatur. Excepteur sint occaecat 
    cupidatat non proident, sunt in culpa qui officia deserunt <small>mollit anim</small> 
    id est laborum.
  </p>
</div>
<div class='info' style='top:150px; left:60px;'>Extra info with a long list of some content goes here</div>


免责声明:

I've done quite a bit of digging on the matter but unfortunately could not find an answer. Some questions seem similar but looking deeper, they are not at all, and some are extremely old & obsolete

谢谢!

经过更多的挖掘,我发现了一个 Gist file,它完全符合我的要求,
所以这里是我稍微调整了一下的工作:

/**
 * Get the caret position, relative to the window 
 * @returns {object} left, top distance in pixels
 */
function getCaretGlobalPosition(){
    const r = document.getSelection().getRangeAt(0)
    const node = r.startContainer
    const offset = r.startOffset
    const pageOffset = {x:window.pageXOffset, y:window.pageYOffset}
    let rect,  r2;

    if (offset > 0) {
        r2 = document.createRange()
        r2.setStart(node, (offset - 1))
        r2.setEnd(node, offset)
        rect = r2.getBoundingClientRect()
        return { left:rect.right + pageOffset.x, top:rect.bottom + pageOffset.y }
    }
}

/////////////////[ DEMO ]\\\\\\\\\\

const contenteditable = document.querySelector('[contenteditable]')
const infoElm = document.querySelector('.info')

contenteditable.addEventListener('input', onInput)

function onInput(){
  const caretGlobalPosition = getCaretGlobalPosition()

  infoElm.style.cssText = `top:${caretGlobalPosition.top}px;
                           left:${caretGlobalPosition.left}px;`
}
.info{
  border: 1px solid gold;
  padding: 8px;
  background: rgba(255,255,224, .8);
  position: absolute;
  z-index: 9999;
  max-width: 180px;
  display:none;
}

.info[style]{ display:block; }
<h2>Place caret somewhere and type:</h2>
<div contenteditable>
  <p>
    Lorem ipsum dolor sit amet, consectetur adipiscing elit, 
    sed do eiusmod tempor incididunt ut labore et dolore magna aliqua. 
    <strong>Ut enim ad minim veniam</strong>, 
    quis nostrud exercitation ullamco laboris nisi ut aliquip ex ea commodo consequat. 
  </p>

  <h2>
    Imagine the caret is somewhere here and the info element is right under it... <div>reprehenderit <em>in</em> voluptate</div> 
    velit esse cillum dolore eu fugiat f nulla pariatur. Excepteur sint occaecat 
    cupidatat non proident, sunt in culpa qui officia deserunt <small>mollit anim</small> 
    id est laborum.
  </h2>
</div>
<div class='info'>Extra info with a long list of some content goes here</div>


我找到的另一个解决方案:https://github.com/component/textarea-caret-position