Javascript富文本编辑器，支持get和set游标位置 [英] Javascript Rich Text Editor with get AND set cursor position support

问题描述

是否有支持获取和设置光标位置的javascript富文本编辑器？

Are there any javascript Rich Text Editors that support getting and setting the cursor position?

推荐答案

我不会解释可怕的细节，但这将工作：

I won't explain the gruesome details, but this will work:

function getTextNodesIn(node) {
  var textNodes = [];

  if (node.nodeType == 3) {
    textNodes.push(node);
  } else {
    var children = node.childNodes;

    for (var i = 0, len = children.length; i < len; ++i) {
      textNodes.push.apply(textNodes, getTextNodesIn(children[i]));
    }
  }

  return textNodes;
}

function setSelectionRange(el, start, end) {
  if (document.createRange && window.getSelection) {
    var range = document.createRange();
    range.selectNodeContents(el);

    var textNodes = getTextNodesIn(el);
    var foundStart = false;
    var charCount = 0, endCharCount;

    for (var i = 0, textNode; textNode = textNodes[i++]; ) {
      endCharCount = charCount + textNode.length;

      if (!foundStart && start >= charCount && (start < endCharCount || (start == endCharCount && i < textNodes.length))) {
        range.setStart(textNode, start - charCount);
        foundStart = true;
      }

      if (foundStart && end <= endCharCount) {
        range.setEnd(textNode, end - charCount);
        break;
      }

      charCount = endCharCount;
    }

    var sel = window.getSelection();

    sel.removeAllRanges();
    sel.addRange(range);
  } else if (document.selection && document.body.createTextRange) {
    var textRange = document.body.createTextRange();

    textRange.moveToElementText(el);
    textRange.collapse(true);
    textRange.moveEnd('character', end);
    textRange.moveStart('character', start);
    textRange.select();
  }
}

现在您只需获取元素并选择内容：

Now you just get your element and select stuff:

setSelectionRange(document.getElementById('dijitEditorBody'), 10, 50);

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