修改contenteditable div中的文本而不重置插入符（光标）位置

问题描述

我正在尝试用< b> / / / / lt; /中的任何东西替换 /此处/ 中的任何内容b> 即时更改，因为在可信任的div中进行了更改。

I am trying to replace any instances of /any thing in here/ with <b>/any thing in here/</b> on the fly, as changes are made in a contenteditable div.

我当前的实现工作正常，但在每个按键时，插入符都被移动到div的开头使实现无法使用。在替换div的内容时是否有某种方法可以保持插入位置？

My current implementation works, but at every keypress the caret is moved to the beginning of div making the implementation unusable. Is there some way to keep the caret position while replacing the div's contents?

$('.writer').on('keyup', function(e) {
     $(this).html($(this).html().replace(/\/(.*)\//g, '<b>\/$1\/<\/b>'));
});

推荐答案

试试吧

    $('#writer').on('keyup', function(e) {
        var range = window.getSelection().getRangeAt(0);
        var end_node = range.endContainer;
        var end = range.endOffset;
        if(end_node != this){
            var text_nodes = get_text_nodes_in(this);
            for (var i = 0; i < text_nodes.length; ++i) {
                if(text_nodes[i] == end_node){
                    break;
                }
                end += text_nodes[i].length;
            }
        }
        var html = $(this).html();
        if(/\&nbsp;$/.test(html) && $(this).text().length == end){
            end = end - 1;
            set_range(end,end,this);
            return;
        }
        var filter = html.replace(/(<b>)?\/([^<\/]*)(<\/b>)?/g, '\/$2');
        console.log(filter);
        filter = filter.replace(/(<b>)?([^<\/]*)\/(<\/b>)?/g, '$2\/');
        console.log(filter);
        filter = filter.replace(/(<b>)?\/([^<\/]*)\/(<\/b>)?/g, '<b>\/$2\/<\/b>');
        console.log(filter);
        if(!/\&nbsp;$/.test($(this).html())){
            filter += '&nbsp;';
        }
        $(this).html(filter);
        set_range(end,end,this);

    });

    $('#writer').on('mouseup', function(e) {
        if(!/\&nbsp;$/.test($(this).html())){
            return;
        }
        var range = window.getSelection().getRangeAt(0);
        var end = range.endOffset;
        var end_node = range.endContainer;
        if(end_node != this){
            var text_nodes = get_text_nodes_in(this);
            for (var i = 0; i < text_nodes.length; ++i) {
                if(text_nodes[i] == end_node){
                    break;
                }
                end += text_nodes[i].length;
            }
        }
        if($(this).text().length == end){
            end = end - 1;
            set_range(end,end,this);
        }
    });

    function get_text_nodes_in(node) {
        var text_nodes = [];
        if (node.nodeType === 3) {
            text_nodes.push(node);
        } else {
            var children = node.childNodes;
            for (var i = 0, len = children.length; i < len; ++i) {
                var text_node
                text_nodes.push.apply(text_nodes, get_text_nodes_in(children[i]));
            }
        }
        return text_nodes;
    }

    function set_range(start, end, element) {
        var range = document.createRange();
        range.selectNodeContents(element);
        var text_nodes = get_text_nodes_in(element);
        var foundStart = false;
        var char_count = 0, end_char_count;

        for (var i = 0, text_node; text_node = text_nodes[i++]; ) {
            end_char_count = char_count + text_node.length;
            if (!foundStart && start >= char_count && (start < end_char_count || (start === end_char_count && i < text_nodes.length))) {
                range.setStart(text_node, start - char_count);
                foundStart = true;
            }
            if (foundStart && end <= end_char_count) {
                range.setEnd(text_node, end - char_count);
                break;
            }
            char_count = end_char_count;
        }

        var selection = window.getSelection();
        selection.removeAllRanges();
        selection.addRange(range);
    }

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