获取contentEditable插入符号索引位置 [英] Get contentEditable caret index position

问题描述

关于如何在 contentEditable 元素中设置光标或插入符号索引位置，我发现了很多很好的，跨浏览器的答案，但是没有关于如何获取或查找其光标的问题。索引...

I'm finding tons of good, crossbrowser anwers on how to SET the cursor or caret index position in a contentEditable element, but none on how to GET or find its index...

我想做的是知道此div中插入符号的索引，位于 keyup 。

What I want to do is know the index of the caret within this div, on keyup.

因此，当用户键入文本时，我随时可以知道其光标在 contentEditable 元素内的索引。

So, when the user is typing text, I can at any point know its cursor's index within the contentEditable element.

编辑：我在div内容（文本）中寻找 INDEX ，而不是光标坐标。

I'm looking for the INDEX within the div contents (text), not the cursor coordinates.

<div id="contentBox" contentEditable="true"></div>

$('#contentbox').keyup(function() { 
    // ... ? 
});

推荐答案

以下代码假定：

• 可编辑的< div> 中始终只有一个文本节点，没有其他节点


• 可编辑div没有将CSS 空白属性设置为 pre

• There is always a single text node within the editable <div> and no other nodes
• The editable div does not have the CSS white-space property set to pre

如果您需要更通用的方法来处理带有嵌套元素的内容，请尝试以下答案：

If you need a more general approach that will work content with nested elements, try this answer:

https://stackoverflow.com/a/4812022/96100

代码：

function getCaretPosition(editableDiv) {
  var caretPos = 0,
    sel, range;
  if (window.getSelection) {
    sel = window.getSelection();
    if (sel.rangeCount) {
      range = sel.getRangeAt(0);
      if (range.commonAncestorContainer.parentNode == editableDiv) {
        caretPos = range.endOffset;
      }
    }
  } else if (document.selection && document.selection.createRange) {
    range = document.selection.createRange();
    if (range.parentElement() == editableDiv) {
      var tempEl = document.createElement("span");
      editableDiv.insertBefore(tempEl, editableDiv.firstChild);
      var tempRange = range.duplicate();
      tempRange.moveToElementText(tempEl);
      tempRange.setEndPoint("EndToEnd", range);
      caretPos = tempRange.text.length;
    }
  }
  return caretPos;
}

#caretposition {
  font-weight: bold;
}

<script src="https://ajax.googleapis.com/ajax/libs/jquery/1.11.1/jquery.min.js"></script>
<div id="contentbox" contenteditable="true">Click me and move cursor with keys or mouse</div>
<div id="caretposition">0</div>
<script>
  var update = function() {
    $('#caretposition').html(getCaretPosition(this));
  };
  $('#contentbox').on("mousedown mouseup keydown keyup", update);
</script>

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