I'm learning JS right now, and I trying to do the following:
I'm creating an html grid, each cell is marked with a cell class which doesn't give it a background color. When I mark the cell (i.e by clicking), the JS code adds it a colored class, which gives it background color:
.colored{
background-color: black;
}
Now, I'm trying to take it a step forward and give the user control over the background color of the cells by using HTML's input (type color). I'm getting the color the user picked, and then I want to change the cells background colors - and here is my problem.
I want to get the css rule for colored class and change it to the value supplied by the user.
I tried changing it by using (colorPicker is the input element):
colorPicker.addEventListener('input', (e) => {
cells.forEach((cell) => {
if(cell.classList.contains('colored'))
cell.style.backgroundColor = e.target.value;
})
})
The above change only the cells which currently have colored class, and not the colored ruleset itself - so the cells which will be marked later won't get the color change.
I've come across ways to change the css ruleset directly by using document.styleSheets, but I'm looking for a more elegant way to change the colored class css.
Is there such a way?
You could implement the same behavior with CSS variables. But instead of changing the style of a specific element you can change the value of the property.
A simple version can be used like so:
const colorPicker = document.querySelector('.color-picker');
colorPicker.addEventListener('input', (event) => {
// Retrieve chosen color
const color = event.target.value;
// Overwrite CSS variable
document.documentElement.style.setProperty('--color-red', color);
}, false);:root {
--color-red: #ff0000;
}
.colored {
background-color: var(--color-red);
margin: 0 0 0.25em;
}<div class="colored">Am I red?</div>
<div class="colored">Should I be red?</div>
<div class="colored">Red is my color?</div>
<div class="colored">All I want is red?</div>
<div class="colored">Roses are red?</div>
<input type="color" class="color-picker" />