Javascript Contenteditable - 将Cursor / Caret设置为索引

问题描述

我将如何改变这一点（）所以它接受一个数字索引和元素并将光标位置设置为该索引？

How would I go a about modifying this(How to set caret(cursor) position in contenteditable element (div)?) so it accepts a number index and element and sets the cursor position to that index?

例如：
如果我有段落：

For example:If I had the paragraph:

<p contenteditable="true">This is a paragraph.</p>

我致电：

setCaret($(this).get(0), 3)

光标将移动到索引3，如下所示：

The cursor would move to index 3 like so:

Thi|s is a paragraph.

---

我有这个，但没有运气：

---

I have this but with no luck:

function setCaret(contentEditableElement, index)
{
    var range,selection;
    if(document.createRange)//Firefox, Chrome, Opera, Safari, IE 9+
    {
        range = document.createRange();//Create a range (a range is a like the selection but invisible)
        range.setStart(contentEditableElement,index);
        range.collapse(true);
        selection = window.getSelection();//get the selection object (allows you to change selection)
        selection.removeAllRanges();//remove any selections already made
        selection.addRange(range);//make the range you have just created the visible selection
    }
    else if(document.selection)//IE 8 and lower
    {
        range = document.body.createTextRange();//Create a range (a range is a like the selection but invisible)
        range.moveToElementText(contentEditableElement);//Select the entire contents of the element with the range
        range.collapse(false);//collapse the range to the end point. false means collapse to end rather than the start
        range.select();//Select the range (make it the visible selection
    }
}

推荐答案

这是一个改编自。请记住这在几个方面并不完美（就像MaxArt的，使用相同的方法）：首先，只考虑文本节点，这意味着< br> 和块元素不包含在索引中;其次，所有文本节点都被考虑，即使是那些被CSS隐藏的元素或< script> 内的元素元素;第三，连续wh在页面上折叠的迭代空格字符都包含在索引中;最后，IE< = 8的规则再次不同，因为它使用不同的机制。

Here's an answer adapted from Persisting the changes of range objects after selection in HTML. Bear in mind that this is less than perfect in several ways (as is MaxArt's, which uses the same approach): firstly, only text nodes are taken into account, meaning that line breaks implied by <br> and block elements are not included in the index; secondly, all text nodes are considered, even those inside elements that are hidden by CSS or inside <script> elements; thirdly, consecutive white space characters that are collapsed on the page are all included in the index; finally, IE <= 8's rules are different again because it uses a different mechanism.

var setSelectionByCharacterOffsets = null;

if (window.getSelection && document.createRange) {
    setSelectionByCharacterOffsets = function(containerEl, start, end) {
        var charIndex = 0, range = document.createRange();
        range.setStart(containerEl, 0);
        range.collapse(true);
        var nodeStack = [containerEl], node, foundStart = false, stop = false;

        while (!stop && (node = nodeStack.pop())) {
            if (node.nodeType == 3) {
                var nextCharIndex = charIndex + node.length;
                if (!foundStart && start >= charIndex && start <= nextCharIndex) {
                    range.setStart(node, start - charIndex);
                    foundStart = true;
                }
                if (foundStart && end >= charIndex && end <= nextCharIndex) {
                    range.setEnd(node, end - charIndex);
                    stop = true;
                }
                charIndex = nextCharIndex;
            } else {
                var i = node.childNodes.length;
                while (i--) {
                    nodeStack.push(node.childNodes[i]);
                }
            }
        }

        var sel = window.getSelection();
        sel.removeAllRanges();
        sel.addRange(range);
    }
} else if (document.selection) {
    setSelectionByCharacterOffsets = function(containerEl, start, end) {
        var textRange = document.body.createTextRange();
        textRange.moveToElementText(containerEl);
        textRange.collapse(true);
        textRange.moveEnd("character", end);
        textRange.moveStart("character", start);
        textRange.select();
    };
}

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