Bootstrap 4 Form Input With Icon For Validation


Answer :

Bootstrap 4 doesn't include icons (glyphicons are gone), and there are now just 2 validation states (is-valid and is-invalid) that control display of the valid-feedback and invalid-feedback text.

With a little extra CSS, you can position an icon inside the input (to the right), and control its' display using is-valid or is-invalid on the form-control input. Use a font lib like fontawesome for the icons. I created a new feedback-icon class that you can add to the valid/invalid-feedback.

.valid-feedback.feedback-icon, .invalid-feedback.feedback-icon {     position: absolute;     width: auto;     bottom: 10px;     right: 10px;     margin-top: 0; }

HTML

<div class="form-group position-relative">      <label for="input2">Valid with icon</label>      <input type="text" class="form-control is-valid" id="input2">      <div class="valid-feedback feedback-icon">           <i class="fa fa-check"></i>      </div>      <div class="invalid-feedback feedback-icon">           <i class="fa fa-times"></i>      </div> </div>

Demo of input validation icons
Demo with working validation

.valid-feedback.feedback-icon, .invalid-feedback.feedback-icon {     position: absolute;     width: auto;     bottom: 10px;     right: 10px;     margin-top: 0; }
<!DOCTYPE html> <html> <head>   <meta name="viewport" content="width=device-width, initial-scale=1">   <link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/bootstrap/4.0.0/css/bootstrap.min.css"> <link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/font-awesome/4.7.0/css/font-awesome.min.css">   <script src="https://ajax.googleapis.com/ajax/libs/jquery/3.3.1/jquery.min.js"></script>   <script src="https://cdnjs.cloudflare.com/ajax/libs/popper.js/1.12.9/umd/popper.min.js"></script>   <script src="https://maxcdn.bootstrapcdn.com/bootstrap/4.0.0/js/bootstrap.min.js"></script> </head> <body> <div class="container">   <div class="form-group position-relative">      <label for="input2">Valid with icon</label>      <input type="text" class="form-control is-valid" id="input2">      <div class="valid-feedback feedback-icon">           <i class="fa fa-check"></i>      </div>      <div class="invalid-feedback feedback-icon">           <i class="fa fa-times"></i>      </div>    </div> </div>

Notice that the containing form-group is position:relative using the position-relative class.


Form validation icons are built-in Bootstrap 4.3.1, see documentation here : https://getbootstrap.com/docs/4.3/components/forms/#custom-styles

For a client-side validation, you can use ParsleyJS plugin. See a demo here : https://jsfiddle.net/djibe89/tu0ap111/

Fake code

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