css select dropdown bold on some 's

问题

On a select dropdown, I need to make certain items 'strong/bold'.

How can I do this?

Example of what I ideally require:

<option value="#"><strong>Andorra</strong></option> 
<option value="#">--Grandvalira</option> 
<option value="#">--Vallnord</option> 
<option value="#"><strong>Austria</strong></option> 
<option value="#">--Amadé</option> 
<option value="#">--Bad Kleinkirchheim</option> 
<option value="#">--Mallnitz</option>

回答1:

you could use :nth-child(N)

option:nth-child(1), option:nth-child(4) {
    font-weight:bold;
}

Demo: http://jsfiddle.net/Sotiris/sqshN/

Find more info and browser support for this pseudo-class at http://reference.sitepoint.com/css/pseudoclass-nthchild

回答2:

You actually can't.

The closest thing (you can't choose a bold item)

 <optgroup label="Swedish Cars">
    <option value="volvo">Volvo</option>
    <option value="saab">Saab</option>
  </optgroup>
  <optgroup label="German Cars">
    <option value="mercedes">Mercedes</option>
    <option value="audi">Audi</option>
  </optgroup>

Which gives you this:

http://www.w3schools.com/tags/tryit.asp?filename=tryhtml_optgroup

You can also build one of your own but it won't be input an input tag (you should use inputs of your own).

回答3:

Using css in the works as a quicker, easier alternative

<option value="value" style="font-weight: bold;">SELECT ME</option>

回答4:

You could do it with jQuery.

  $('#Your select').append($("<option></option>").attr.css("font-weight" , "bold").html("Bold Text"));

You'd have to add some logic to determine which options to bold, obviously.

回答5:

This also works (Firefox 50 and Chrome 55). Items 3 and 5 are shown in bold

   <style>
    .bld {font-weight:bold;}
   </style>
   <select>
    <option value = "1">Kanakangi
    <option value = "2">Ratnangi
    <option class = "bld" value = "8">Hanumatthodi
    <option value = "9">Dhenuka
    <option class = "bld" value = "15">Mayamalavagowla
    <option value = "16">Chakravaaham
  </select>

来源：https://stackoverflow.com/questions/9078927/css-select-dropdown-bold-on-some-options

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