Question

我找到了很多关于如何在contentEditable DIV中设置光标或插入位置的好的，交叉浏览器的答案，但没有关于如何获取或找到它的位置......

我想要做的是知道该div中的插入符号在键盘上的位置。

因此，当用户输入文本时，我可以随时知道其光标在div中的位置。

编辑：我在div内容（文本）中寻找INDEX，而不是光标坐标。

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

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

Answer 1

以下代码假定：

可编辑的<div>中只有一个文本节点，没有其他节点
可编辑div没有将CSS white-space属性设置为pre

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>

Answer 2

＆＃13;

$("#editable").on('keydown keyup mousedown mouseup',function(e){
		   
       if($(window.getSelection().anchorNode).is($(this))){
    	  $('#position').html('0')
       }else{
         $('#position').html(window.getSelection().anchorOffset);
       }
 });

＆＃13;

body{
  padding:40px;
}
#editable{
  height:50px;
  width:400px;
  border:1px solid #000;
}
#editable p{
  margin:0;
  padding:0;
}

＆＃13;

<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.0.1/jquery.min.js"></script>
<div contenteditable="true" id="editable">move the cursor to see position</div>
<div>
position : <span id="position"></span>
</div>

＆＃13;

Answer 3

试试这个：

Caret.js 从文本字段中获取插入位置和偏移量

https://github.com/ichord/Caret.js

演示： http://ichord.github.com/Caret.js

Answer 4

在其他答案中我看不到的一些皱纹：

该元素可以包含多个级别的子节点（例如，具有具有子节点的子节点的子节点...）
选择内容可以包含不同的开始和结束位置（例如，选择了多个字符）
包含插入符号开始/结束的节点可能不是元素或其直接子元素

这是一种获取开始位置和结束位置作为元素的textContent值的偏移量的方法：

// node_walk: walk the element tree, stop when func(node) returns false
function node_walk(node, func) {
  var result = func(node);
  for(node = node.firstChild; result !== false && node; node = node.nextSibling)
    result = node_walk(node, func);
  return result;
};

// getCaretPosition: return [start, end] as offsets to elem.textContent that
//   correspond to the selected portion of text
//   (if start == end, caret is at given position and no text is selected)
function getCaretPosition(elem) {
  var sel = window.getSelection();
  var cum_length = [0, 0];

  if(sel.anchorNode == elem)
    cum_length = [sel.anchorOffset, sel.extentOffset];
  else {
    var nodes_to_find = [sel.anchorNode, sel.extentNode];
    if(!elem.contains(sel.anchorNode) || !elem.contains(sel.extentNode))
      return undefined;
    else {
      var found = [0,0];
      var i;
      node_walk(elem, function(node) {
        for(i = 0; i < 2; i++) {
          if(node == nodes_to_find[i]) {
            found[i] = true;
            if(found[i == 0 ? 1 : 0])
              return false; // all done
          }
        }

        if(node.textContent && !node.firstChild) {
          for(i = 0; i < 2; i++) {
            if(!found[i])
              cum_length[i] += node.textContent.length;
          }
        }
      });
      cum_length[0] += sel.anchorOffset;
      cum_length[1] += sel.extentOffset;
    }
  }
  if(cum_length[0] <= cum_length[1])
    return cum_length;
  return [cum_length[1], cum_length[0]];
}

Answer 5

金达晚了聚会，但万一其他人都在挣扎。在过去两天中，我发现的所有Google搜索都没有找到任何可行的方法，但我提出了一种简洁而优雅的解决方案，无论您拥有多少个嵌套标签，该解决方案都将始终有效：

cursor_position() {
    var sel = document.getSelection();
    sel.modify("extend", "backward", "paragraphboundary");
    var pos = sel.toString().length;
    console.log('pos: '+pos);
    if(sel.anchorNode != undefined) sel.collapseToEnd();

    return pos;
}

它一直选择到段落的开头，然后计算字符串的长度以获取当前位置，然后撤消选择以将光标返回到当前位置。如果要对整个文档（一个以上的段落）执行此操作，则将paragraphboundary更改为documentboundary或根据您的情况选择任何粒度。检出more details的API。干杯! ：）

Answer 6

//global savedrange variable to store text range in
var savedrange = null;

function getSelection()
{
    var savedRange;
    if(window.getSelection && window.getSelection().rangeCount > 0) //FF,Chrome,Opera,Safari,IE9+
    {
        savedRange = window.getSelection().getRangeAt(0).cloneRange();
    }
    else if(document.selection)//IE 8 and lower
    { 
        savedRange = document.selection.createRange();
    }
    return savedRange;
}

$('#contentbox').keyup(function() { 
    var currentRange = getSelection();
    if(window.getSelection)
    {
        //do stuff with standards based object
    }
    else if(document.selection)
    { 
        //do stuff with microsoft object (ie8 and lower)
    }
});

注意：范围对象的self可以存储在变量中，并且可以随时重新选择，除非contenteditable div的内容发生变化。

IE 8及更低版本的参考： http://msdn.microsoft.com/en-us/library/ms535872(VS.85).aspx

标准（所有其他）浏览器的参考： https://developer.mozilla.org/en/DOM/range（它的mozilla文档，但代码也适用于chrome，safari，opera和ie9）

Answer 7

function getCaretPosition() {
    var x = 0;
    var y = 0;
    var sel = window.getSelection();
    if(sel.rangeCount) {
        var range = sel.getRangeAt(0).cloneRange();
        if(range.getClientRects()) {
        range.collapse(true);
        var rect = range.getClientRects()[0];
        if(rect) {
            y = rect.top;
            x = rect.left;
        }
        }
    }
    return {
        x: x,
        y: y
    };
}

Answer 8

这个适用于我：

cashtoken

调用行取决于事件类型，对于键事件使用：

function getCaretCharOffsetInDiv(element) {
    var caretOffset = 0;
    if (typeof window.getSelection != "undefined") {
        var range = window.getSelection().getRangeAt(0);
        var preCaretRange = range.cloneRange();
        preCaretRange.selectNodeContents(element);
        preCaretRange.setEnd(range.endContainer, range.endOffset);
        caretOffset = preCaretRange.toString().length;
    }
    else if (typeof document.selection != "undefined" && document.selection.type != "Control")
    {
        var textRange = document.selection.createRange();
        var preCaretTextRange = document.body.createTextRange();
        preCaretTextRange.moveToElementText(element);
        preCaretTextRange.setEndPoint("EndToEnd", textRange);
        caretOffset = preCaretTextRange.text.length;
    }
    return caretOffset;
}

用于鼠标事件：

getCaretCharOffsetInDiv(e.target) + ($(window.getSelection().getRangeAt(0).startContainer.parentNode).index());

在这两种情况下，我通过添加目标索引

来处理断行

Answer 9

这使我永远无法使用新的window.getSelection API，我将分享给后代。请注意，MDN建议对window.getSelection提供更广泛的支持，但是，您的里程可能会有所不同。

const getSelectionCaretAndLine = () => {
    // our editable div
    const editable = document.getElementById('editable');

    // collapse selection to end
    window.getSelection().collapseToEnd();

    const sel = window.getSelection();
    const range = sel.getRangeAt(0);

    // get anchor node if startContainer parent is editable
    let selectedNode = editable === range.startContainer.parentNode
      ? sel.anchorNode 
      : range.startContainer.parentNode;

    if (!selectedNode) {
        return {
            caret: -1,
            line: -1,
        };
    }

    // in case there is nested doms inside editable
    while(selectedNode.parentNode !== editable) {
        selectedNode = selectedNode.parentNode;
    }

    // select to top of editable
    range.setStart(editable.firstChild, 0);

    // do not use 'this' sel anymore since the selection has changed
    const content = window.getSelection().toString();
    const text = JSON.stringify(content);
    const lines = (text.match(/\\n/g) || []).length + 1;

    // clear selection
    window.getSelection().collapseToEnd();

    // minus 2 because of strange text formatting
    return {
        caret: text.length - 2, 
        line: lines,
    }
}

这是一个jsfiddle，可在键盘启动时触发。但是请注意，快速方向按键以及快速删除似乎是跳过事件。

Answer 10

一种直接的方法，它遍历contenteditable div的所有子项，直到到达endContainer。然后，我添加结束容器偏移量，然后得到字符索引。应该与任何数量的嵌套一起使用。使用递归。

注意：需要JSON Request API / Parameters Mapping才能支持Element.closest('div[contenteditable]')

poly fill

function caretPositionIndex() {
    const range = window.getSelection().getRangeAt(0);
    const { endContainer, endOffset } = range;

    // get contenteditableDiv from our endContainer node
    let contenteditableDiv;
    const contenteditableSelector = "div[contenteditable]";
    switch (endContainer.nodeType) {
      case Node.TEXT_NODE:
        contenteditableDiv = endContainer.parentElement.closest(contenteditableSelector);
        break;
      case Node.ELEMENT_NODE:
        contenteditableDiv = endContainer.closest(contenteditableSelector);
        break;
    }
    if (!contenteditableDiv) return '';


    const countBeforeEnd = countUntilEndContainer(contenteditableDiv, endContainer);
    if (countBeforeEnd.error ) return null;
    return countBeforeEnd.count + endOffset;

    function countUntilEndContainer(parent, endNode, countingState = {count: 0}) {
      for (let node of parent.childNodes) {
        if (countingState.done) break;
        if (node === endNode) {
          countingState.done = true;
          return countingState;
        }
        if (node.nodeType === Node.TEXT_NODE) {
          countingState.count += node.length;
        } else if (node.nodeType === Node.ELEMENT_NODE) {
          countUntilEndContainer(node, endNode, countingState);
        } else {
          countingState.error = true;
        }
      }
      return countingState;
    }
  }

Answer 11

如果你将可编辑的 div 样式设置为 "display:inline-block; white-space: pre-wrap" 你在输入新行时不会得到新的子 div，你只会得到 LF 字符（即 &# 10);.

function showCursPos(){
    selection = document.getSelection();
    childOffset = selection.focusOffset;
    const range = document.createRange();
    eDiv = document.getElementById("eDiv");
    range.setStart(eDiv, 0);
    range.setEnd(selection.focusNode, childOffset);
    var sHtml = range.toString();
    p = sHtml.length; 
    sHtml=sHtml.replace(/(\r)/gm, "\\r");
    sHtml=sHtml.replace(/(\n)/gm, "\\n");
    document.getElementById("caretPosHtml").value=p;
    document.getElementById("exHtml").value=sHtml;   
  }

click/type in div below:
<br>
<div contenteditable name="eDiv" id="eDiv"  
     onkeyup="showCursPos()" onclick="showCursPos()" 
     style="width: 10em; border: 1px solid; display:inline-block; white-space: pre-wrap; "
     >123&#13;&#10;456&#10;789</div>
<p>
html caret position:<br> <input type="text" id="caretPosHtml">
<p>  
html from start of div:<br> <input type="text" id="exHtml">

我注意到当您在可编辑 div 中按“enter”键时，它会创建一个新节点，因此 focusOffset 重置为零。这就是为什么我必须添加一个范围变量，并将其从子节点的 focusOffset 扩展回 eDiv 的开头（从而捕获其间的所有文本）。

Answer 12

这个建立在@alockwood05 的答案之上，并为在 contenteditable div 内带有嵌套标签的插入符号以及节点内的偏移量提供 get 和 set 功能，以便您拥有一个既可通过偏移量序列化又可反序列化的解决方案

我在跨平台代码编辑器中使用此解决方案，需要在通过词法分析器/解析器突出显示语法之前获取插入符号开始/结束位置，然后立即将其设置回来。

function countUntilEndContainer(parent, endNode, offset, countingState = {count: 0}) {
    for (let node of parent.childNodes) {
        if (countingState.done) break;
        if (node === endNode) {
            countingState.done = true;
            countingState.offsetInNode = offset;
            return countingState;
        }
        if (node.nodeType === Node.TEXT_NODE) {
            countingState.offsetInNode = offset;
            countingState.count += node.length;
        } else if (node.nodeType === Node.ELEMENT_NODE) {
            countUntilEndContainer(node, endNode, offset, countingState);
        } else {
            countingState.error = true;
        }
    }
    return countingState;
}

function countUntilOffset(parent, offset, countingState = {count: 0}) {
    for (let node of parent.childNodes) {
        if (countingState.done) break;
        if (node.nodeType === Node.TEXT_NODE) {
            if (countingState.count <= offset && offset < countingState.count + node.length)
            {
                countingState.offsetInNode = offset - countingState.count;
                countingState.node = node; 
                countingState.done = true; 
                return countingState; 
            }
            else { 
                countingState.count += node.length; 
            }
        } else if (node.nodeType === Node.ELEMENT_NODE) {
            countUntilOffset(node, offset, countingState);
        } else {
            countingState.error = true;
        }
    }
    return countingState;
}

function getCaretPosition()
{
    let editor = document.getElementById('editor');
    let sel = window.getSelection();
    if (sel.rangeCount === 0) { return null; }
    let range = sel.getRangeAt(0);    
    let start = countUntilEndContainer(editor, range.startContainer, range.startOffset);
    let end = countUntilEndContainer(editor, range.endContainer, range.endOffset);
    let offsetsCounts = { start: start.count + start.offsetInNode, end: end.count + end.offsetInNode };
    let offsets = { start: start, end: end, offsets: offsetsCounts };
    return offsets;
}

function setCaretPosition(start, end)
{
    let editor = document.getElementById('editor');
    let sel = window.getSelection();
    if (sel.rangeCount === 0) { return null; }
    let range = sel.getRangeAt(0);
    let startNode = countUntilOffset(editor, start);
    let endNode = countUntilOffset(editor, end);
    let newRange = new Range();
    newRange.setStart(startNode.node, startNode.offsetInNode);
    newRange.setEnd(endNode.node, endNode.offsetInNode);
    sel.removeAllRanges();
    sel.addRange(newRange);
    return true;
}

Answer 13

这个适用于角度

private getCaretPosition() {
   let caretRevCount = 0;
   if (window.getSelection) {
      const selection = window.getSelection();
      const currentNode = selection.focusNode.parentNode;
      caretRevCount = selection.focusOffset;
      let previousNode = currentNode.previousSibling;
      while(previousNode && previousNode.nodeName === 'SPAN') { 
      // you can check specific element
      caretRevCount += previousNode.textContent.length;
      previousNode = previousNode.previousSibling;
      }
    }
    return caretRevCount;
}

Answer 14

此答案适用于嵌套文本元素，使用递归函数。 ?

奖励：将插入符号位置设置为保存位置。

function getCaretData(elem) {
  var sel = window.getSelection();
  return [sel.anchorNode, sel.anchorOffset];
}

function setCaret(el, pos) {
  var range = document.createRange();
  var sel = window.getSelection();
  range.setStart(el,pos);
  range.collapse(true);
  sel.removeAllRanges();
  sel.addRange(range);
}


let indexStack = [];

function checkParent(elem) {
  
  let parent = elem.parentNode;
  let parentChildren = Array.from(parent.childNodes);
  
  let elemIndex = parentChildren.indexOf(elem);
  
  indexStack.unshift(elemIndex);
  
  if (parent !== cd) {
    
    checkParent(parent);
    
  } else {
    
    return;
    
  }
  
}

let stackPos = 0;
let elemToSelect;

function getChild(parent, index) {
  
  let child = parent.childNodes[index];
  
  if (stackPos < indexStack.length-1) {
    
    stackPos++;
        
    getChild(child, indexStack[stackPos]);
    
  } else {
    
    elemToSelect = child;
    
    return;
    
  }
  
}


let cd = document.querySelector('.cd'),
    caretpos = document.querySelector('.caretpos');

cd.addEventListener('keyup', () => {
  
  let caretData = getCaretData(cd);
  
  let selectedElem = caretData[0];
  let caretPos = caretData[1];
  
  
  indexStack = [];
  checkParent(selectedElem);
    
  
  cd.innerHTML = 'Hello world! <span>Inline! <span>In inline!</span></span>';
  
  
  stackPos = 0;
  getChild(cd, indexStack[stackPos]);
  
  
  setCaret(elemToSelect, caretPos);
  
  
  caretpos.innerText = 'indexStack: ' + indexStack + '. Got child: ' + elemToSelect.data + '. Moved caret to child at pos: ' + caretPos;
  
})

.cd, .caretpos {
  font-family: system-ui, Segoe UI, sans-serif;
  padding: 10px;
}

.cd span {
  display: inline-block;
  color: purple;
  padding: 5px;
}

.cd span span {
  color: chocolate;
  padding: 3px;
}

:is(.cd, .cd span):hover {
  border-radius: 3px;
  box-shadow: inset 0 0 0 2px #005ecc;
}

<div class="cd" contenteditable="true">Hello world! <span>Inline! <span>In inline!</span></span></div>
<div class="caretpos">Move your caret inside the elements above ⤴</div>

Codepen

在contentEditable div中获取插入位置

14 个答案: