Protect Required Field Text For Free

The required attribute is a boolean attribute. When present, it specifies that an input field must be filled out before submitting the form. Note: The required attribute works with the following input types: text, search, url, tel, email, password, date pickers, number, checkbox, radio, and file.

We can also use JavaScript to customize the error message, in addition to using CSS, and control how it is displayed. To customize the error message using JavaScript, we can use the "setCustomValidity" method, which allows us to specify a custom error message for the input field.

To make a select mandatory with HTML, use the required attribute. With the required attribute, the user must select a value before submitting the form; if the user refuses to select a value, then the form won't submit.

To customize the error message using JavaScript, we can use the "setCustomValidity" method, which allows us to specify a custom error message for the input field.

To validate the form using HTML, we will use HTML <input> required attribute. The <input> required attribute is a Boolean attribute that is used to specify the input element must be filled out before submitting the Form.

The simplest HTML validation feature is the required attribute. To make an input mandatory, add this attribute to the element. When this attribute is set, the element matches the :required UI pseudo-class and the form won't submit, displaying an error message on submission when the input is empty.

Making a field required in Adobe Acrobat Open the necessary PDF form, choose Forms & Signatures > Prepare Form. Select the field that needs to be required, right click on it and choose Set as a Required Field: Save changes.

By setting and unsetting the setCustomValidity in the right time, the validation message will work flawlessly. I used onchange instead of oninput which is more general and occurs when the value is changed in any condition even through JavaScript.