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changing css class variables


You should first write your Less file, for instance as follows:

.marginTop(@topMargin) {
margin-top: @topMargin;
}

p.marginTop-10 {
.marginTop(10px); 
}

p.marginTop-15 {
.marginTop(15px); 
}

The preceding Less code will compile into the following CSS code:

p.marginTop-10 {
  margin-top: 10px;
}
p.marginTop-15 {
  margin-top: 15px;
}

After that you can use in your HTML:

<p class="marginTop-10">css
help</p>
<p class="marginTop-15">css help</p>

Notice that you can also compile a list of classes dynamically, see also: LESS loops used to generate column classes in twitter - How do they work?

Doing that you could write the the following Less code:

@margins: 10 20 50;

.marginTop(@i: 1) when (@i <= length(@margins))
{
.marginTop(@i + 1);
@margin-top: extract(@margins,@i);
.marginTop-@{margin-top} {
    margin-top:unit(@margin-top,px);
    }
}

.marginTop();

outputs:

.marginTop-50 {
  margin-top: 50px;
}
.marginTop-20 {
  margin-top: 20px;
}
.marginTop-10 {
  margin-top: 10px;
}

Categories : CSS

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