Best methods for deleting an element's attribute or style attribute

Imagine this snippet of CSS code:

.notif-icon {
    display: inline-block;
}

In my HTML, I have the following element which starts off hidden by overriding the display property of the notif-icon class:

<span id="error" class="notif-icon" style="display:none">ERROR!</span>

I want to show the "ERROR!" message (when necessary) by removing the display property override. The question is how best to accomplish this. Any of these methods seem to work:

document.getElementById("error").removeAttribute("style");
document.getElementById("error").style.removeProperty("display");

However, I prefer working with element properties rather than calling attribute/property functions. I attempted these alternatives, but none were successful:

delete document.getElementById("error").style;
delete document.getElementById("error").style.display;

Yet, any of the following approaches do work:

  1. document.getElementById("error").style = "";

  2. document.getElementById("error").style = undefined;

  3. document.getElementById("error").style.display = "";

Assigning undefined to the display property does *not* achieve the desired effect.

So, my main question is which of the three effective assignments should be preferred, if any. Additional explanations or references on the different variants would also be welcome.

javascripthtmlcss

Answer №1

The first choice removes the entire style attribute, making it not recommended. The second option is unlikely to work as expected. Lastly, the third option sets the style attribute to an invalid value, causing it to revert back to its default state. Out of the three choices, the third one is considered the most optimal.

It's generally advisable to avoid inline styling (What's so bad about in-line CSS?). Instead, having a class that dictates whether an element should be visible or hidden is preferable. Here's an example:

const error = document.querySelector('.notif-icon');
document.querySelector('button').addEventListener('click', () => error.classList.toggle('hidden'));
.notif-icon {
  display: inline-block;
}

.hidden {
  display: none;
}
<span id="error" class="notif-icon hidden>ERROR!</span>
<button>Toggle</button>

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