What methods can be utilized in JavaScript to replicate the functionality of the CSS attr() function?

Is there a way to mimic the functionality of the attr() function in JavaScript? Specifically, I want to adjust the indentation of a paragraph based on the value of data-indent, similar to how we use 

p { text-indent: attr(data-indent em) }
.

<p data-indent=4>Hello World :-)</p>

EDIT: Although some may find my question trivial, @G-Cyrillus's response sheds light on an important concept. It dawned on me that inline styling is sometimes unavoidable, even though I initially preferred using HTML classes and IDs instead. This inquiry arose from an attempt to address another issue I had posted about. Thanks to this newfound knowledge, I can now effortlessly display tree data structures with an HTML table without relying on JavaScript.

javascripthtmlcss

Answer №1

Identify and style elements using their attributes, iterate through them, and apply inline styles based on the values in the data-attribute.

const items = document.querySelectorAll('[data-margin]');
for (const item of items) {
  item.style.margin = `${item.dataset.margin}em`;
}

Answer №2

As mentioned in a previous comment:

Indeed, the var() CSS option is quite cost-effective. Simply fill the attribute (style instead of data-X) and include a single rule in the CSS stylesheet. For example: https://example.com/css-var-demo

If your attributes are populated on the server side, you can eliminate the need for JavaScript by utilizing the style attribute to define a CSS variable that pertains solely to that particular element. Refer to for further exploration.

Here's a demonstration (based on the aforementioned demo) to illustrate the concept:

* {/* this demo illustrates the effect on any tag */
  text-indent: var(--indent);
  /* this value has versatile applications */
  background: linear-gradient(90deg, gray var(--indent), yellow var(--indent))
}

[style]:after {
  content: attr(style);
  background: green;
  color: white;
}
<h1 style='--indent:4em'>Hello World :-)</h1>
<p style='--indent:2em'>Hello World :-)</p>
<p style='--indent:44em'>Hello World :-)</p>
<div style='--indent:12em'>Hello World :-)</div>
<p style='--indent:34em'>Hello World :-)</p>
<p style='--indent:0em'>Hello World :-)</p>
<p >Hello World :-)</p>

The var() function in CSS can accept various values, including numerical ones that can be used for calculations within a calc(), defining a font-size, components of a color, or any other creative application... as long as it fits into a CSS rule.

Answer №3

Take a look at this sample code snippet:

const paragraph = document.querySelector("p");
paragraph.style.textIndent = paragraph.getAttribute("data-indent") + "em";

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