I have a question about CSS:
.class1 { background: #fff }
Now, I need to achieve the following:
.class2 { background: rgba(255,0,0,0.5) };
Is there a way to use JavaScript only to change the background property of .class1 and give it an opacity of 0.5?
For instance, could I do something like this:
$('.class1').css('background-opacity', '.5');
If anyone has any suggestions or solutions, please share!
Thank you
If you're searching for a method to retrieve RGBA from an HTML color, you may want to consider implementing a function that can accomplish this task...
One possible approach could involve the following code:
var color = $('.class1').css("background-color"); // This line retrieves the RGB() color even if it was in HTML format previously
var opacity = 0.5;
color = color.toString().replace(/\)/g,"," + opacity + ")");
$('.class1').css("background-color",color);
Feel free to view the live demonstration on this link.
Utilizing CSS variables would be the ideal solution in this scenario.
const targetDiv = document.querySelector("div");
targetDiv.addEventListener("click", () => {
targetDiv.style.setProperty("--opacity", "0.5");
});div {
height: 100px;
width: 100px;
--opacity: 1;
background: rgba(255, 0, 0, var(--opacity));
}<div>
Click to change opacity.
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