What are the steps for incorporating validation in bootstrap 4 css?

I came across this interesting example in the documentation for bootstrap 4:

<div class="form-group has-success">
  <label class="form-control-label" for="inputSuccess1">Input with success</label>
  <input type="text" class="form-control form-control-success" id="inputSuccess1">
  <div class="form-control-feedback">Success! You've done it.</div>
  <small class="form-text text-muted">Example help text that remains unchanged.</small>
 </div>
 <div class="form-group has-warning">
  <label class="form-control-label" for="inputWarning1">Input with warning</label>
  <input type="text" class="form-control form-control-warning" id="inputWarning1">
   <div class="form-control-feedback">Shucks, check the formatting of that and try again.</div>
  <small class="form-text text-muted">Example help text that remains unchanged.</small>
</div>
<div class="form-group has-danger">
  <label class="form-control-label" for="inputDanger1">Input with danger</label>
  <input type="text" class="form-control form-control-danger" id="inputDanger1">
  <div class="form-control-feedback">Sorry, that username's taken. Try another?</div>
  <small class="form-text text-muted">Example help text that remains unchanged.</small>
</div>

However, I noticed that the edits are not displayed in color

The documentation advises to load the CSS file, but it seems that the class "has-danger" is missing

Surprisingly, the class "has-danger" exists in the CSS file of bootstrap 3

https://getbootstrap.com/docs/3.3/dist/css/bootstrap.min.css

In fact, when I use the CSS file of bootstrap 3, the edits are displayed in color

Is there a way to incorporate the "has-danger" class in bootstrap 4 without using Sass?

Answer №1

Bootstrap4 has deprecated the use of the Class has-danger. Instead, utilize the is-invalid selector in the input and add class="invalid-feedback" to your code.

<div class="invalid-feedback">

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