D3.js | d3.rgb() Function

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The d3.rgb() function in D3.js is used to return RGB value of the specified CSS color.

Syntax:

d3.rgb(color);

Parameters: This function accepts single parameter color which is used to specify the CSS color.

Return Value: This function returns RGB value of the given CSS color.

Below programs illustrate the d3.rgb() function in D3.js:

Example 1:

<!DOCTYPE html> 
<html> 
  
<head> 
    <title>d3.rgb() function</title> 
  
    <script src='https://d3js.org/d3.v4.min.js'></script> 
</head> 
  
<body> 
    <script> 
          
        // Calling the d3.rgb() function function 
        // with some parameters 
        var color1 = d3.rgb("red"); 
        var color2 = d3.rgb("green"); 
        var color3 = d3.rgb("blue"); 
        
        // Getting the RGB values 
        console.log(color1); 
        console.log(color2); 
        console.log(color3); 
    </script> 
</body> 
  
</html> 

Output:

{"r":255, "g":0, "b":0, "opacity":1}
{"r":0, "g":128, "b":0, "opacity":1}
{"r":0, "g":0, "b":255, "opacity":1}

Example 2:

<!DOCTYPE html> 
<html> 
  
<head> 
    <title>d3.rgb() function</title> 
  
    <script src='https://d3js.org/d3.v4.min.js'></script> 
</head> 
  
<body> 
    <script> 
          
        // Calling the d3.rgb() function function 
        // without any parameters 
        var color = d3.rgb(); 
        
        // Getting the RGB values 
        console.log(color); 
    </script> 
</body> 
  
</html> 

Output:

{"r":null, "g":null, "b":null, "opacity":1}

Reference: https://devdocs.io/d3~5/d3-color#rgb

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