Having Difficulty Applying a Background Color to a Class in Bulk

Question

Having Difficulty Applying a Background Color to a Class in Bulk

I am working on a unique HTML canvas for pixel art, which is created using a table made up of various divs all sharing the "pixel" class. I want to add a clear button that can reset the entire canvas, but changing the background color of each individual div isn't feasible given the number of pixels involved. Can anyone explain why the following code won't work and offer an alternative solution?

function clearCanvas() {
  document.getElementsByClassName("pixel").style.backgroundColor = "white";
}

Your input is greatly appreciated!

javascript css class background-color

Answer 1

Answer №1

Since getElementsByClassName gives back a HTMLCollection which is similar to an array, you are unable to directly apply styles to it. Instead, you can loop through each element and set their individual styles like so:

const pixels = document.getElementsByClassName("pixel");

for(const pixel of pixels)
    pixel.style.backgroundColor = "white";

Answer 2

Since getElementsByClassName gives back a HTMLCollection which is similar to an array, you are unable to directly apply styles to it. Instead, you can loop through each element and set their individual styles like so:

const pixels = document.getElementsByClassName("pixel");

for(const pixel of pixels)
    pixel.style.backgroundColor = "white";

Answer 3

Answer №2

getElementsByClassName provides a convenient way to target multiple elements with a specific class and apply styling individually.

for(let element of document.getElementsByClassName("pixel")) {
  element.style.backgroundColor = "white";
}

Answer 4

getElementsByClassName provides a convenient way to target multiple elements with a specific class and apply styling individually.

for(let element of document.getElementsByClassName("pixel")) {
  element.style.backgroundColor = "white";
}

Having Difficulty Applying a Background Color to a Class in Bulk

Answer №1

Answer №2

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