How to combine numbers and letters in ordered list? - html

Question

How to increment ordered list with numbers and alphabet letters in CSS:
ol.nested {
margin-bottom: 0;
counter-reset: item;
}
ol.nested li {
display: block;
position: relative;
}
ol.nested li:before {
content: counters(item, ".", decimal) ".";
counter-increment: item;
position: absolute;
margin-right:100%;
right: 10px;
}
<ol class="nested">
<li>Item 1</li>
<li>Item 2</li>
<li>Item 3
<ol class="nested">
<li>Show Item 3.a instead of 3.1</li>
<li>Show Item 3.b instead of 3.2</li>
<li>Show Item 3.c instead of 3.3</li>
</ol>
</li>
<li>Item 4
<ol class="nested">
<li>Show Item 4.a instead of 4.1</li>
<li>Show Item 4.b instead of 4.2</li>
<li>Show Item 4.c instead of 4.3</li>
</ol>
</li>
<li>Item 5</li>
</ol>
Is there a way to combine numbers with letters (2.a, 2.b, 2.c) and increment them in ordered list? With content and counters-increment the list will be incremented only with one type either decimal or lower-alpha. How to combine decimal with lower-alpha incrementing? Thank you!

Answer 1

you can use multiple counters with multiple counter-reset, and apply a counter-increment to ::before and ::after
.nested {
margin-bottom: 0;
counter-reset: number letter; /* default reset for number and letter */
}
.nested.third li {
counter-reset: number 2; /* reset all child li in order to keep 3.x */
}
.nested.fourth {
counter-reset: letter /* reset the letter to restart at A */
}
.nested.fourth li {
counter-reset: number 3; /* reset all child li in order to keep 4.x */
}
.nested li {
display: block;
position: relative;
}
.parent li::before {
content: counter(number)".";
counter-increment: number; /* increment the numbers in general */
position: absolute;
margin-right: 100%;
right: 20px;
background: lightgreen
}
.child li::after {
content: counter(letter, lower-alpha); /* increment the letters in general */
counter-increment: letter;
position: absolute;
margin-right: 100%;
right: 10px;
background: lightblue;
width: 10px
}
<ol class="nested parent">
<li>Item 1</li>
<li>Item 2</li>
<li>Item 3
<ol class="nested child third">
<li>Show Item 3.a instead of 3.1</li>
<li>Show Item 3.b instead of 3.2</li>
<li>Show Item 3.c instead of 3.3</li>
</ol>
</li>
<li>Item 4
<ol class="nested child fourth">
<li>Show Item 4.a instead of 4.1</li>
<li>Show Item 4.b instead of 4.2</li>
<li>Show Item 4.c instead of 4.3</li>
</ol>
</li>
<li>Item 5</li>
</ol>
OP's comment
Sorry, you're right. The numbers are exactly as I asked. Is there no way to have generic css class for the next items 5, 6, 7 and
so on? Hm.
As #Mr Lister answered below you can do it, so I'm updating my answer to meet your specs.
As you can see by the colors, the difference from one snippet to another is that in the first one you have more control over each item, in this one is more general.
.nested li {
display: block;
position: relative;
}
.nested {
margin-bottom: 0;
counter-reset: number;
}
.parent .nested {
counter-reset: letter;
}
.parent .nested li::before {
content: counter(number) "." counter(letter, lower-alpha);
counter-increment: letter;
background: lightblue
}
.nested li::before {
content: counter(number) ".";
counter-increment: number;
position: absolute;
margin-right: 100%;
right: 10px;
background: lightgreen
}
<ol class="nested parent">
<li>Item 1</li>
<li>Item 2</li>
<li>Item 3
<ol class="nested">
<li>Show Item 3.a instead of 3.1</li>
<li>Show Item 3.b instead of 3.2</li>
<li>Show Item 3.c instead of 3.3</li>
</ol>
</li>
<li>Item 4
<ol class="nested">
<li>Show Item 4.a instead of 4.1</li>
<li>Show Item 4.b instead of 4.2</li>
<li>Show Item 4.c instead of 4.3</li>
</ol>
</li>
<li>Item 5</li>
</ol>

Answer 2

Is this what you need? It doesn't rely on any specific class names for the different nested lists, so you can have as many lists as you want.
The trick is to use items for the outer list and subitems for the inner ones.
ol.nested {
margin-bottom: 0;
counter-reset: item;
}
ol.nested li {
display: block;
position: relative;
}
ol.nested li:before {
content: counters(item, ".", decimal) ".";
counter-increment: item;
position: absolute;
margin-right: 100%;
right: 10px;
}
.nested .nested {
counter-reset: subitem;
}
.nested .nested li:before {
content: counter(item) "." counter(subitem, lower-alpha);
counter-increment: subitem;
}
<ol class="nested">
<li>Item 1</li>
<li>Item 2</li>
<li>Item 3
<ol class="nested">
<li>Show Item 3.a instead of 3.1</li>
<li>Show Item 3.b instead of 3.2</li>
<li>Show Item 3.c instead of 3.3</li>
</ol>
</li>
<li>Item 4
<ol class="nested">
<li>Show Item 4.a instead of 4.1</li>
<li>Show Item 4.b instead of 4.2</li>
<li>Show Item 4.c instead of 4.3</li>
</ol>
</li>
<li>Item 5</li>
</ol>