css甚至不使用伪元素

Question

I have a container div names wrapper and it has several child divs named thumb I want to apply css pseudo elements with the even and odd.

My codes are

<div class="wrapper">
   <div class="col-half">
      <div class="thumb">
        ...
      </div>
   </div>
   <div class="col-half">
      <div class="thumb">
        ...
      </div>
   </div>
   <div class="col-half">
      <div class="thumb">
        ...
      </div>
   </div>
   <div class="col-half">
      <div class="thumb">
        ...
      </div>
   </div>
</div>

And my css:

.wrapper:nth-child(even) .thumb:after{
    //some codes
}
.wrapper:nth-child(odd) .thumb:after{
    //some codes
}

But i am getting only odd styles.

Answer 1

Since the odd and even relationship is applied based on sibling index, you need to apply it on col-half as that is the repeated element.

Since your thumb element is the first child of its parent, it will only satisfy the odd selector

 .wrapper .col-half:nth-child(even) .thumb:after { content: 'x' } .wrapper .col-half:nth-child(odd) .thumb:after { content: 'y' } 

 <div class="wrapper"> <div class="col-half"> <div class="thumb"> ... </div> </div> <div class="col-half"> <div class="thumb"> ... </div> </div> <div class="col-half"> <div class="thumb"> ... </div> </div> <div class="col-half"> <div class="thumb"> ... </div> </div> </div> 

Answer 2

You have a misunderstanding about :nth-child as it does not work as "nth child of this container" but as "am I the nth child of my parent?".

So you need to apply :nth-child(odd/even) to .col-half :

.col-half:nth-child(even) .thumb:after{
    //some codes
}
.col-half:nth-child(odd) .thumb:after{
    //some codes
}

The name for this selector has really caused many misunderstandings as it is too easy to misunderstand the way you did.

Answer 3

.col-half:nth-child(even) {
    color: green;
}
.col-half:nth-child(odd) {
    color: red;
}

Answer 4

Try like this: Demo

In your css, You are using the parent div for showing even and odd. Instead you need to use odd / even for child elements which repeats

.col-half:nth-child(even) .thumb{
  background:#ccc;
}
.col-half:nth-child(odd) .thumb{
   background:#f00;
}

Answer 5

Try This One

.wrapper .col-half:nth-child(2n) .thumb:after {
  content: '';
}

.wrapper .col-half:nth-child(2n-1) .thumb:after {
  content: '';
}