jquery - Number nested ordered lists in HTML

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jquery - Number nested ordered lists in HTML

posted Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

jquery - Number nested ordered lists in HTML

I have a nested ordered list.

<ol>
  <li>first</li>
  <li>second
  <ol>
    <li>second nested first element</li>
    <li>second nested secondelement</li>
    <li>second nested thirdelement</li>
  </ol>
  </li>
  <li>third</li>
  <li>fourth</li>
</ol>

Currently the nested elements start back from 1 again, e.g.

first
second
1. second nested first element
2. second nested second element
3. second nested third element
third
fourth

What I want is for the second element to be numbered like this:

first
second

2.1. second nested first element

2.2. second nested second element

2.3. second nested third element
third
fourth

Is there a way of doing this?

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1 Reply

深蓝 · Answer 1 · 2021-10-16T22:31:04+0000

Here's an example which works in all browsers. The pure CSS approach works in the real browsers (i.e. everything but IE6/7) and the jQuery code is to cover the unsupported. It's in flavor of an SSCCE, you can just copy'n'paste'n'run it without changes.

<!doctype html>
<html lang="en">
    <head>
        <title>SO question 2729927</title>
        <script src="http://code.jquery.com/jquery-latest.min.js"></script>
        <script>
            $(document).ready(function() {
                if ($('ol:first').css('list-style-type') != 'none') { /* For IE6/7 only. */
                    $('ol ol').each(function(i, ol) {
                        ol = $(ol);
                        var level1 = ol.closest('li').index() + 1;
                        ol.children('li').each(function(i, li) {
                            li = $(li);
                            var level2 = level1 + '.' + (li.index() + 1);
                            li.prepend('<span>' + level2 + '</span>');
                        });
                    });
                }
            });
        </script>
        <style>
            html>/**/body ol { /* Won't be interpreted by IE6/7. */
                list-style-type: none;
                counter-reset: level1;
            }
            ol li:before {
                content: counter(level1) ". ";
                counter-increment: level1;
            }
            ol li ol {
                list-style-type: none;
                counter-reset: level2;
            }
            ol li ol li:before {
                content: counter(level1) "." counter(level2) " ";
                counter-increment: level2;
            }
            ol li span { /* For IE6/7. */
                margin: 0 5px 0 -25px;
            }
        </style>
    </head>
    <body>
        <ol>
            <li>first</li>
            <li>second
                <ol>
                    <li>second nested first element</li>
                    <li>second nested second element</li>
                    <li>second nested third element</li>
                </ol>
            </li>
            <li>third</li>
            <li>fourth</li>
        </ol>
    </body>
</html>

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jquery - Number nested ordered lists in HTML

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