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Q&A

Dye all label asterisks Red with vanilla JavaScript

+2
−0

I want to dye all label asterisks Red with vanilla JavaScript.

CSS isn't good for this because it would dye both asterisks and colons (:) instead just the asterisks:

.labelWithColonAndAsterisk:after {
    content:":*"; 
    color:red;
}

So, I need a (vanilla) JavaScript solution.

Here is what I have already tried and failed:

const labelsWithAnAsterisk = document.qeurySelectorAll("label");
labelsWithAnAsterisk.forEach((element) => {
    if (element.textContent.indexOf("*") !== -1) {
        element.textContent.indexOf("*").style.color = "Red";
    }
});

Uncaught TypeError: document.qeurySelectorAll is not a function at :1:39

I understand that one element can't have two color properties (black for colon and red for asterisk) and this might explain the error.

Anyway, how would you achieve that goal?

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1 comment

You mispelt 'querySelectorAll', hence the Uncaught Type Error. Andrew Shepherd‭ 21 days ago

2 answers

+4
−0

In HTML, style information is applied to elements; it can't be applied to individual characters in a text node. Therefore, if you want to style the * differently, it needs a dedicated element.

You can use a pseudo element for that, but since an element can't have two after pseudo elements, you can't attach it to the label. Unfortunately, you can't attach it to the input either, because input is not a container.

That leaves either adding an element through markup or JavaScript. Adding it in markup clutters the markup, and may cause bugs if the span and input disagree on whether the field is required.

I'd therefore add it via JavaScript. If I had to to this without a web application framework, I'd do something like this:

document.querySelectorAll("input[required]").forEach(e => {
  const span = document.createElement("span");
  span.className = "requiredMarker";
  e.parentNode.insertBefore(span, e);
})

and then style that element with CSS

span.requiredMarker::after {
  content: "*";
  color: red;
}

This way, all required inputs automatically get the necessary DOM element.

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0 comments

+3
−0

While there might be some JavaScript "magic-like" solution I don't know of, my own solution was making the HTML a tiny bit more complex and adjusting the CSS to the change.

I have inserted my label tags into span tags and also created respective-successive span tags which contain only an asterisk and which are dyed separately, and wrapped any such structure in a div:

HTML

<div><span><label for="name" id="cf_label_name">Name</label></span><span class="required">*</span></div>
<input type="text" name="name" id="cf_input_name" required></input>

<div><span><label for="email" id="cf_label_email">Email address</label></span><span class="required">*</span></div>
<input type="email" name="email" id="cf_input_email" required></input>

CSS

label:after {
  content:":";
}
.required {
  color: red;
}
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