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Question: bootstrap form validation not working
Time: Asked 49 minute ago
Modified: Updated 50 hours ago
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bootstrap form validation not working

There could be various reasons why the Bootstrap form validation is not working. Here are some of the most common causes and their solutions:

Make sure you have included the necessary Bootstrap files: Bootstrap requires both JavaScript and CSS files to work properly. Ensure that you have included both files in your code.
Check your code for syntax errors: Make sure your HTML code is valid and does not contain any syntax errors. Even a small mistake in your code can cause the Bootstrap validation to fail.
Make sure you have added the “required” attribute: Bootstrap validation requires the “required” attribute to be added to the form fields that need to be validated. Make sure you have added this attribute to your input fields.
Check your JavaScript code for errors: If your validation still isn’t working, make sure you have included the necessary JavaScript code for Bootstrap validation. Check your code for any errors or conflicts with other scripts.
Make sure your form is wrapped in the correct HTML: The Bootstrap validation requires the form to be wrapped in the correct HTML structure. Make sure your form is wrapped in a <form> tag with the class “needs-validation” and that each input field is wrapped in a <div> tag with the class “form-group”.
Test on different browsers: If the above solutions do not work, test your code on different browsers to see if the issue is browser-specific. Some older versions of Internet Explorer may not support the Bootstrap validation.

Hopefully, one of these solutions will help you fix the issue with your Bootstrap form validation.

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javascript form validation not working

There could be various reasons why your JavaScript form validation is not working. Here are a few things to check:

Make sure the JavaScript file is linked properly in the HTML file. Check that the file path is correct and there are no typos in the file name.
Check if there are any syntax errors in your JavaScript code. You can use a code editor or browser console to check for any errors that might be preventing your code from running.
Ensure that the form element has an ID or a class, and that your JavaScript code is referencing the correct ID or class.
Make sure the event listener is properly attached to the form element. You can use console.log() statements to check if the event listener is being triggered when the form is submitted.
Check if the input values are being correctly captured by your JavaScript code. You can use console.log() statements to print out the input values and check if they match what is expected.
Ensure that your validation logic is correct. Check that the conditional statements are evaluating to the correct values and that the logic is sound.

If none of these solutions work, try posting your code and any error messages you are seeing, so that others can help you debug the issue.

bootstrap form validation example demo

Sure, here’s an example of Bootstrap form validation using HTML, CSS, and JavaScript:

php
<!DOCTYPE html>
<html>
<head>
	<title>Bootstrap Form Validation Example</title>
	<link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/bootstrap/4.0.0/css/bootstrap.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">
		<h2>Bootstrap Form Validation Example</h2>
		<form class="needs-validation" novalidate>
			<div class="form-group">
				<label for="name">Name:</label>
				<input type="text" class="form-control" id="name" placeholder="Enter name" name="name" required>
				<div class="invalid-feedback">
					Please enter your name.
				</div>
			</div>
			<div class="form-group">
				<label for="email">Email:</label>
				<input type="email" class="form-control" id="email" placeholder="Enter email" name="email" required>
				<div class="invalid-feedback">
					Please enter a valid email address.
				</div>
			</div>
			<div class="form-group">
				<label for="password">Password:</label>
				<input type="password" class="form-control" id="password" placeholder="Enter password" name="password" required>
				<div class="invalid-feedback">
					Please enter a password.
				</div>
			</div>
			<button type="submit" class="btn btn-primary">Submit</button>
		</form>
	</div>

	<script>
		// Disable form submission if there are invalid fields
		(function() {
			'use strict';
			window.addEventListener('load', function() {
				// Get the form we want to add validation to
				var form = document.getElementsByClassName('needs-validation')[0];
				// Prevent submission if form is invalid
				form.addEventListener('submit', function(event) {
					if (form.checkValidity() === false) {
						event.preventDefault();
						event.stopPropagation();
					}
					form.classList.add('was-validated');
				}, false);
			}, false);
		})();
	</script>
</body>
</html>

In this example, we have a simple form with three fields: name, email, and password. Each field has the “required” attribute, which means that it must be filled out before the form can be submitted.

We’ve also added the “needs-validation” class to the form tag, which tells Bootstrap to validate the form fields using JavaScript.

For each form field, we’ve added an “invalid-feedback” div that will be displayed if the user tries to submit the form without filling out the field. This div contains a message telling the user what they need to do to fix the error.

Finally, we’ve added a bit of JavaScript that disables form submission if there are any invalid fields. This prevents the user from submitting the form until all required fields are filled out.

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