In this example, we use structures like this, which include extra <span>
s to generate content on; we'll use these to provide indicators of valid/invalid data:
<div>
<label for="fname">First name *: </label>
<input id="fname" name="fname" type="text" required />
<span></span>
</div>
To provide these indicators, we use the following CSS:
input + span {
position: relative;
}
input + span::before {
position: absolute;
right: -20px;
top: 5px;
}
input:invalid {
border: 2px solid red;
}
input:invalid + span::before {
content: "✖";
color: red;
}
input:valid + span::before {
content: "✓";
color: green;
}
We set the <span>
s to position: relative
so that we can position the generated content relative to them. We then absolutely position different generated content depending on whether the form's data is valid or invalid — a green check or a red cross, respectively. To add a bit of extra urgency to the invalid data, we've also given the inputs a thick red border when invalid.
Note: We've used ::before
to add these labels, as we were already using ::after
for the "required" labels.
You can try it below:
Notice how the required text inputs are invalid when empty, but valid when they have something filled in. The email input on the other hand is valid when empty, as it is not required, but invalid when it contains something that is not a proper email address.