12

I have a contentEditable div in which I have multiple tags (br, b, u, i) and text.

I need to get the caret index position relative to the div, including all the tags.

For example:

<div id="h" contenteditable="true">abc<b>def<br>ghi</b>jkl</div>

If the cursor is between g and h, I need the caret index position to be 14. The problem is that the found methods that use a treeWalker do not work in this case. The bold tag is not found... probably because it isn't closed. Also I have tried several methods but still no luck.

I need it to work in Firefox. Thank you.

4

2 回答 2

22

你试过这个吗？ 获取范围相对于其父容器的开始和结束偏移量

直接链接到 jsfiddle： https ://jsfiddle.net/TjXEG/1/

功能代码：

function getCaretCharacterOffsetWithin(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;
}

function showCaretPos() {
    var el = document.getElementById("test");
    var caretPosEl = document.getElementById("caretPos");
    caretPosEl.innerHTML = "Caret position: " + getCaretCharacterOffsetWithin(el);
}

document.body.onkeyup = showCaretPos;
document.body.onmouseup = showCaretPos;
于 2013-05-24T14:42:02.887 回答
8

只需要这样做，因此有一些可行的解决方案（可能需要进行一些测试）

基本思想是：

  1. 使用此方法获取 textContent 位置：在包含 HTML 内容的 contentEditable 区域中获取插入符号（光标）位置

  2. 遍历元素的 innerHTML 到 textContent 位置

  3. 如果遇到html标签或实体，遍历它直到正常字符，然后继续

示例代码在这里：

function getCaretPosition (node) {
    var range = window.getSelection().getRangeAt(0),
        preCaretRange = range.cloneRange(),
        caretPosition,
        tmp = document.createElement("div");

    preCaretRange.selectNodeContents(node);
    preCaretRange.setEnd(range.endContainer, range.endOffset);
    tmp.appendChild(preCaretRange.cloneContents());
    caretPosition = tmp.innerHTML.length;
    return caretPosition;
}

function getHTMLCaretPosition(element) {
var textPosition = getCaretPosition(element),
    htmlContent = element.innerHTML,
    textIndex = 0,
    htmlIndex = 0,
    insideHtml = false,
    htmlBeginChars = ['&', '<'],
    htmlEndChars = [';', '>'];


if (textPosition == 0) {
  return 0;
}

while(textIndex < textPosition) {

  htmlIndex++;

  // check if next character is html and if it is, iterate with htmlIndex to the next non-html character
  while(htmlBeginChars.indexOf(htmlContent.charAt(htmlIndex)) > -1) {
    // console.log('encountered HTML');
    // now iterate to the ending char
    insideHtml = true;

    while(insideHtml) {
      if (htmlEndChars.indexOf(htmlContent.charAt(htmlIndex)) > -1) {
        if (htmlContent.charAt(htmlIndex) == ';') {
          htmlIndex--; // entity is char itself
        }
        // console.log('encountered end of HTML');
        insideHtml = false;
      }
      htmlIndex++;
    }
  }
  textIndex++;
}

//console.log(htmlIndex);
//console.log(textPosition);
// in htmlIndex is caret position inside html
return htmlIndex;
}
于 2017-03-01T12:27:04.500 回答