How to Indent Multiple Levels of Select Optgroup with CSS

How to indent multiple levels of select optgroup with CSS?

8/29/2016 Edit

The original answer below is no longer functional in modern browsers. For those who still need to use a tag instead of doing magic with HTML lists, a better solution was found on this stackoverflow thread: Rendering a hierarchy of "OPTION"s in a "SELECT" tag

I would recommend the solution suggested by igor-krupitsky who suggests dropping   and using the binary   instead. At least on Chrome, this does not break using the keyboard to find the first character of an item in the list.

End Edit

The current HTML specification does not provide for nested tags adding any functionality (such as indentation). See this link.

In the mean time, you can manually style your levels with CSS. I tried using styles in your sample, but for some reason they did not render correctly, so at the very least the following will work:

<select name="select_projects" id="select_projects">

        <option value="">project.xml</option>

        <optgroup label="client1">

            <option value="">project2.xml</option>

        </optgroup>

        <optgroup label="client2">

            <option value="">project5.xml</option>

            <option value="">project6.xml</option>

            <optgroup label="client2_a">

                <option value="" style="margin-left:23px;">project7.xml</option>

                <option value="" style="margin-left:23px;">project8.xml</option>

            </optgroup>

            <option value="">project3.xml</option>

            <option value="">project4.xml</option>

       </optgroup>

       <option value="">project0.xml</option>

       <option value="">project1.xml</option>

    </select>

Best modern way of creating indentation in a select ?

Prefix your <option> text with an appropriate amount of   (character code 160, respectively).

Nesting optgroups in a dropdownlist/select

Ok, if anyone ever reads this: the best option is to add four  s at each extra level of indentation, it would seem!

so:

<select>

 <optgroup label="Level One">

  <option> A.1 </option>

  <optgroup label="    Level Two">

   <option>     A.B.1 </option>

  </optgroup>

  <option> A.2 </option>

 </optgroup>

</select>

Rendering a hierarchy of OPTION s in a SELECT tag

deceze way is much better and was my first idea. As an alternative if that doesn't work is that you can use non-breaking spaces in the tag value:

<select>
    <option>select me</option>
    <option> me indented</option>
    <option>  even more indentation</option>
</select>

It's far from pretty but it might work for you if the optgroup doesn't.

Rendering a hierarchy of OPTION s in a SELECT tag

deceze way is much better and was my first idea. As an alternative if that doesn't work is that you can use non-breaking spaces in the tag value:

<select>
    <option>select me</option>
    <option> me indented</option>
    <option>  even more indentation</option>
</select>

It's far from pretty but it might work for you if the optgroup doesn't.

HTML / CSS: Nested options in a select field?

You can use <optgroup> to create a single level of nesting...

<select>
  <optgroup label="Options 1">
    <option>Option 1.1</option>
    <option>Option 1.2</option>
  </optgroup>
  <optgroup label="Options 2">
    <option>Option 2.1</option>
    <option>Option 2.2</option>
  </optgroup>
</select>

Laravel Nested Option Groups

That's because you can not make a select element in html with "multiple layers of group options"!

You can have multiple <optgroup> tags inside a <select> tag, and inside an <optgroup> you can have <option>s. And Laravel is just trying to make HTML.

http://www.w3.org/TR/html401/interact/forms.html#h-17.6

See these answers for some hacky workarounds:

Nesting optgroups in a dropdownlist/select

How to indent multiple levels of select optgroup with CSS?

Selectable optgroup in HTML select tag

I don't think you can but you can easily reproduce the visual style with css and thus only have options in your select, so everything is selectable.

.optionGroup {

    font-weight: bold;

    font-style: italic;

}

    

.optionChild {

    padding-left: 15px;

}

<select multiple="multiple">

    <option value="0" class="optionGroup">Parent Tag</option>

    <option value="1" class="optionChild">Child Tag</option>

    <option value="2" class="optionChild">Child Tag</option>

</select>

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