The method of using jQuery in the Java class library (Methods of Form Validation USING JQURY in Java Class Libraares)
Use jQuery to verify forms is a common method that helps developers to effectively verify the form data entered by the user input.Using jquery in the Java class library to verify form verification through the following steps.
1. Import jQuery library: First of all, you need to import the jquery library into your project.You can download the latest version of jQuery from the official website (https://jquery.com/) and include it in your Java project.
For example, add the following code to your HTML file:
<head>
<script src="https://ajax.googleapis.com/ajax/libs/jquery/3.6.0/jquery.min.js"></script>
<script src="your-javascript-file.js"></script>
</head>
2. Write JavaScript code: Create a JavaScript file to process form verification logic.You can use the jQuery selector and event processing program in this file to process form verification.
script
$(document).ready(function() {
// Register an event processing procedure on the submission button of the FORM
$('form').submit(function() {
var isValid = true;
// Verify each input field that needs to be verified
$('input[type="text"]').each(function() {
if ($.trim($(this).val()) == '') {
$ (this) .addclass ('error'); // Add the wrong CSS class
isValid = false;
} else {
$(this).removeClass('error');
}
});
// Return the verification results (True represents the verification, and the false representative has not passed the verification)
return isValid;
});
});
In the above example, we assume that all input fields with "Text" are verified.If any one in these fields is empty, it will add a "error" class, otherwise it will be deleted.If there is any field with the "ERROR" class when submitting the form, the value method will return false to prevent the submission of the form.
3. Apply verification in the HTML form: In your HTML form, add the required input fields and provide them with appropriate tags (for example, set the required field as Required).
html
<form action="submit.php" method="post">
<Label for = "name"> Name: </label>
<input type="text" id="name" name="name" required>
<Label for = "Email"> Email: </label>
<input type="text" id="email" name="email" required>
<input type = "submit" value = "Submit">
</form>
In the above example, we use the "Required" property to mark these fields.
Through the above steps, you can use jQuery in the Java library to verify the form.Whenever the user tries to submit the form, the JavaScript code will verify the form field and add or delete the error class according to the verification results.These error classes can help you provide custom styles for the wrong field in the interface and prevent the form from submitting the form.
I hope this article will help the Java class library that uses JQuery for form verification!
