javascript - Modify text in a contenteditable div without resetting the caret (cursor) position - Stack Overflow

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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.

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>'));
});

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.

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>'));
});

• javascript
• jquery
• html
• regex
• contenteditable

Share Improve this question Follow edited Oct 10, 2018 at 6:33 Cœur 38.8k2525 gold badges205205 silver badges277277 bronze badges asked Jul 19, 2014 at 21:42 slyvslyv 83811 gold badge1010 silver badges1818 bronze badges 5

• Is there a reason you have to use a div with contenteditable instead of a textarea or something similar? – royhowie Commented Jul 19, 2014 at 21:47
• @Luxelin: I'd like to render html within the div, and as far as I am aware, html can't be rendered inside a textarea. – slyv Commented Jul 19, 2014 at 21:49
• Even if you were to use a textarea I'm sure the caret would still move around. – Lee Taylor Commented Jul 19, 2014 at 21:53
• 2 This question may be of use for you, regarding setting the caret position. – royhowie Commented Jul 19, 2014 at 21:54
• I've answered a very similar question recently: stackoverflow./a/24687874/96100 – Tim Down Commented Jul 20, 2014 at 16:33

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1 Answer 1

Sorted by: Reset to default 6

$('#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);
        }

<script src="https://cdnjs.cloudflare./ajax/libs/jquery/3.3.1/jquery.min.js"></script>
<div id="writer" contenteditable style="width:300px;height:100px;border:1px solid #ccc;">/input some words here!/</div>

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