如何获得包含图像的contenteditable div的插入位置

Question

我有这个contentedittable div

<div contenteditable="true" id="text">minubyv<img src="images/smiley/Emoji Smiley-01.png" class="emojiText" />iubyvt</div>

这是代码输出的图像描述

所以我想获得div的插入位置,并假设光标位于最后一个字符之后.这是我获得插入位置的代码

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;
}

var update = function() {
  console.log(getCaretPosition(this));
};
$('#text').on("mousedown mouseup keydown keyup", update);

但问题是它返回6而不是14.插入符号位置返回到0图像之后.请问14在这种情况下我可以获得插入位置.

编辑

我想从插入符号位置开始插入一些元素.所以这是我的功能

selectStart = 0;
var update = function() {
  selectStart = getCaretPosition(this);
};
function insertEmoji(svg){
    input = $('div#text').html();
    beforeCursor = input.substring(0, selectStart);
    afterCursor = input.substring(selectStart, input.length);
    emoji = '<img src="images/smiley/'+svg+'.png" class="emojiText" />';
    $('div#text').html(beforeCursor+emoji+afterCursor);
}

Answer 1

请参阅Tim Down的答案,获取范围相对于其父容器的开始和结束偏移量.

尝试使用他拥有的函数来获取具有嵌套元素的选择索引,如下所示:

function getCaretCharacterOffsetWithin(element) {
    var caretOffset = 0;
    var doc = element.ownerDocument || element.document;
    var win = doc.defaultView || doc.parentWindow;
    var sel;
    if (typeof win.getSelection != "undefined") {
        sel = win.getSelection();
        if (sel.rangeCount > 0) {
            var range = win.getSelection().getRangeAt(0);
            var preCaretRange = range.cloneRange();
            preCaretRange.selectNodeContents(element);
            preCaretRange.setEnd(range.endContainer, range.endOffset);
            caretOffset = preCaretRange.toString().length;
        }
    } else if ( (sel = doc.selection) && sel.type != "Control") {
        var textRange = sel.createRange();
        var preCaretTextRange = doc.body.createTextRange();
        preCaretTextRange.moveToElementText(element);
        preCaretTextRange.setEndPoint("EndToEnd", textRange);
        caretOffset = preCaretTextRange.text.length;
    }
    return caretOffset;
}

var update = function() {
  console.log(getCaretCharacterOffsetWithin(this));
};
$('#text').on("mousedown mouseup keydown keyup", update);

<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
<div contenteditable="true" id="text">minubyv<img src="https://themeforest.net/images/smileys/happy.png" class="emojiText" />iubyvt</div>

我写了自己的功能,基于Tim Down,它的工作方式就像你想要的那样.我更改了treeWalker过滤器NodeFilter.ELEMENT_NODE的内容NodeFilter.SHOW_TEXT,现在<img/>元素也在循环中处理.我首先存储range.startOffset然后通过所有选择树节点递归.如果它找到一个img节点,那么它只向该位置添加1; 如果当前节点元素与我们不同range.startContainer,则它会添加该节点的长度.位置由每个循环lastNodeLength添加的不同变量改变charCount.最后,它添加了剩下的东西lastNodeLength到charCount它存在循环时我们有正确的最终插入位置,包括图像元素.

最终的工作代码 (最后返回14,完全按照你想要的那样)

function getCharacterOffsetWithin_final(range, node) {
    var treeWalker = document.createTreeWalker(
        node,
        NodeFilter.ELEMENT_NODE,
        function(node) {
            var nodeRange = document.createRange();
            nodeRange.selectNodeContents(node);
            return nodeRange.compareBoundaryPoints(Range.END_TO_END, range) < 1 ?
                NodeFilter.FILTER_ACCEPT : NodeFilter.FILTER_REJECT;
        },
        false
    );

    var charCount = 0, lastNodeLength = 0;

    if (range.startContainer.nodeType == 3) {
        charCount += range.startOffset;
    }

    while (treeWalker.nextNode()) {
        charCount += lastNodeLength;
        lastNodeLength = 0;
        
        if(range.startContainer != treeWalker.currentNode) {
            if(treeWalker.currentNode instanceof Text) {
                lastNodeLength += treeWalker.currentNode.length;
            } else if(treeWalker.currentNode instanceof HTMLBRElement ||
                      treeWalker.currentNode instanceof HTMLImageElement /* ||
                      treeWalker.currentNode instanceof HTMLDivElement*/)
            {
                lastNodeLength++;
            }
        }
    }
    
    return charCount + lastNodeLength;
}

var update = function() {
    var el = document.getElementById("text");
    var range = window.getSelection().getRangeAt(0);
    console.log("Caret pos: " + getCharacterOffsetWithin_final(range, el))
};
$('#text').on("mouseup keyup", update);

<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
<div contenteditable="true" id="text">minubyv<img contenteditable="true" src="https://themeforest.net/images/smileys/happy.png" class="emojiText" />iubyvt</div>