Retrieve the transparency level of the div element

I am trying to determine the opacity of a simple div using JavaScript.

Currently, I am using the following code:

var d = document.getElementById('1').style.opacity;
    console.log(d); //prints nothing

However, when I check the output in the console.log, it shows an empty line. Do I need to explicitly add the opacity property in the CSS file or is it set by default?

This is my HTML & CSS:

.room{    
    width:90%;
    height:75px;
    border-radius:3px;
    text-align:center;
}

<div class="room" id="1">
       //content
</div>

Any ideas on why it's returning a blank result?

javascripthtmlcss

Answer №1

Implement

let value = window.getComputedStyle(document.getElementById('1')).opacity;

as a substitute for

var value = document.getElementById('1').style.opacity;

This method will retrieve the CSS property values after the application of active stylesheets.

Source

Answer №2

When your JavaScript code is in the "head" section, it may run into issues because the DOM has not finished loading. To avoid this problem, consider placing the script after the relevant div element.

Answer №3

It appears that there is no opacity specified in the current CSS file

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