Guide on making a JavaScript button with both "light and dark" modes

Currently, I am attempting to change the color scheme of the page by adjusting the :root variables using a function called changeBackgrondColor(). This function is then assigned to the fontAwesome moon "button". However, when I click on the moon, the page changes colors briefly before returning to its original state.

var r = document.querySelector(':root');
var rootStyles = getComputedStyle(r);
function changeBackgroundColor(){
    r.style.setProperty('--clr-1', 'blue');
    r.style.setProperty('--clr-2', 'blue');
    r.style.setProperty('--clr-3', 'blue');
    r.style.setProperty('--clr-4', 'blue');
}
javascripthtmlcss

Answer №1

In general, the preferred method is to apply the class theme-dark to the body element and utilize CSS variables for defining colors:

.theme-dark{
  --body-bg:#333;
  --color:#aaa;
  --input-bg: #555;
}
body{
  background-color: var(--body-bg);
  color: var(--color);
}

input, button{
  color: var(--color);
  background-color: var(--input-bg);
}
<input><button onclick="document.body.classList.toggle('theme-dark')">Toggle dark theme</button>

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