How to Convert Hex to RGBA and RGBA to Hex Functions in JavaScript

By w3iscool, April 8, 2023

Introduction:

JavaScript is a popular programming language used for creating dynamic and interactive web pages. One of the most common tasks in web development is manipulating color values. In this tutorial, we will look at how to convert hex to RGBA and RGBA to hex functions in JavaScript.

What is Hex?

Hex is a hexadecimal color code that represents a color by using a combination of red, green, and blue (RGB) values. Hexadecimal values range from 0 to 255, with 0 being the minimum value and 255 being the maximum value. The format of a hex color code is #RRGGBB, where RR represents the red value, GG represents the green value, and BB represents the blue value.

What is RGBA?

RGBA is an acronym for red, green, blue, and alpha. It is similar to hex in that it represents a color by using red, green, and blue values. However, RGBA also includes an alpha channel that determines the opacity of the color. The format of an RGBA color code is rgba(R, G, B, A), where R, G, and B represent the red, green, and blue values, respectively, and A represents the alpha value.

Converting Hex to RGBA:

To convert a hex color code to RGBA, we need to extract the red, green, and blue values from the hex code and add an alpha value of 1. We can do this by using the parseInt() function to extract the RGB values and then create an RGBA string using the template literal syntax. Here is an example:

function hexToRgba(hex) {
  const r = parseInt(hex.slice(1, 3), 16);
  const g = parseInt(hex.slice(3, 5), 16);
  const b = parseInt(hex.slice(5, 7), 16);
  const rgba = `rgba(${r}, ${g}, ${b}, 1)`;
  return rgba;
}

In this example, the hexToRgba() function takes a hex color code as an argument and returns an RGBA color code.

Converting RGBA to Hex:

Converting an RGBA color code to a hex color code requires extracting the red, green, and blue values from the RGBA code and then converting them to hexadecimal values. We can do this by using the toString() method with a radix of 16 to convert the RGB values to hexadecimal values and then concatenate them into a hex string. Here is an example:

function rgbaToHex(rgba) {
  const rgbaArr = rgba.slice(5, -1).split(",");
  const r = parseInt(rgbaArr[0]);
  const g = parseInt(rgbaArr[1]);
  const b = parseInt(rgbaArr[2]);
  const hex = `#${r.toString(16)}${g.toString(16)}${b.toString(16)}`;
  return hex;
}

In this example, the rgbaToHex() function takes an RGBA color code as an argument and returns a hex color code.

Conclusion:

In this tutorial, we have looked at how to convert hex to RGBA and RGBA to hex functions in JavaScript. By using these functions, you can manipulate color values in your web applications with ease.

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