Append leading zeros to ordered list items
Written byPhuoc Nguyen
Created
16 Mar, 2021
Category
Tip
Tags
CSS
Setting the
`list-style-type` property to the below value will append zero number to items of an ordered list (`ol`):css
ol {
list-style-type: decimal-leading-zero;
}However, it only has effect with the items whose indices are less than 10. It means that if our list has more than 100 items, then they will be prefixed as following:
shell
01. Item
02. Item
...
09. Item
10. Item
...
99. Item
100. Item
...In order to fix that issue, we can use the CSS counter. Each item holds the current value of the counter which is incremented by one in the next item:
css
ol {
counter-reset: items;
list-style-type: none;
}
li {
counter-increment: items;
}To prefix an item with its associate counter value, the
`::before` pseudo element comes to the rescue.css
li:before {
content: '00' counter(items) '. ';
}
li:nth-child(n + 10)::before {
content: '0' counter(items) '. ';
}
li:nth-child(n + 100)::before {
content: counter(items) '. ';
}The
`:nth-child(n+10)` selector indicates the items whose indices are greater or equal to 10. It will override the styles applied for `li::before` elements.
In the same way, `:nth-child(n+100)` overrides the styles of `:nth-child(n+10)`.#See also
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Phước Nguyễn