The d3.color() function in D3.js is used to parse the specified CSS color used as parameter of the function and return RGB or HSL color. If specifier is not given, then null is returned.
Syntax:
d3.color(color);
Parameters: This function accepts single parameter color which specifies the CSS color.
Return Value: This function returns the RGB or HSL color value of the specified CSS color taken as the parameter of the function.
Below programs illustrate the d3.color() function in D3.js:
Example 1:
<!DOCTYPE html> <html>   <head>     <title>d3.color() function</title>   </head>   <body>     <script>                   // Calling the d3.color() function function         // with some parameters         var color1 = d3.color("red");         var color2 = d3.color("green");         var color3 = d3.color("blue");                 // Getting the RGB or HSL 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.color() function</title>   </head>   <body>     <script>                   // Calling the d3.color() function function         // without any parameters         var color = d3.color();                 // Getting the RGB or HSL values         console.log(color);     </script> </body>   </html> |
Output:
null
Reference: https://devdocs.io/d3~5/d3-color#color
