if/else condition in CSS

Given an HTML file and we need to apply using if-else conditions in CSS.

No, We can not use if-else conditions in CSS as CSS doesn’t support logics. But we can use some alternatives to if-else which are discussed below:

Method 1: In this method, we will use classes in HTML file to achieve this. We will define different class names according to the conditions which we want to apply in CSS.



  • Suppose we want to change the color of text according to the line number then the if-else condition will be:
    if(line1){
       color : red;
    }else{
       color : green;
    }
  • By using the above-discussed method, we will create classes and then apply CSS in it:
    .color-line1{
       color : red;
    }
    .color-line2{
       color : green;
    }
    

So, the above classes will execute only for HTML tags in which these classes are used.

Example:

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<html
  
<head
    <title
        If-else condition in CSS
    </title
      
    <!-- Applying CSS -->
    <style>
        /* First line CSS */
        .color-line1{
            color : red;
        }
          
        /* Second line CSS */
        .color-line2{
            color: green;
        }
    </style>
</head
  
<body style="text-align:center;"
  
    <h1 style="color:green;"
        GeeksforGeeks 
    </h1
  
    <h3
        If-else condition in CSS
    </h3>
    <span class="color-line1">This is first line</span>
    <br><br>
    <span class="color-line2">This is second line</span>
  
</body
  
</html
                                     

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Output:

Method 2: We can use CSS preprocessors like SASS which allows us to write condition statements in it. Even if you use SASS you have to pre-process your stylesheets which means that the condition are evaluated at compile time, not at run time.

Syntax:

$type: line;
p {
  @if $type == line1 {
    color: blue;
  } @else if $type == line2 {
    color: red;
  } @else if $type == line3 {
    color: green;
  } @else {
    color: black;
  }
}

To know more about SASS click here
To read about if-else in SASS click here



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