Input Required Field Log For Free

Using the required option Using NgIf we are silencing the error but saving ourselves the code to check the input. Using OnInit we can ensure that the value has been provided but also have to write extra code for that. Using the selector, we can enforce the usage of the @Input and get an error message at compile time.

Use asterisks to indicate required fields? Another common approach seen in forms is to mark the mandatory fields with an asterisk and not mark the optional fields. While an asterisk to the left of the label makes it easy to see, it assumes a user understands what this means.

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.

Angular Directive to the rescue @HostListener('keydown', ['$event']) onKeyDown(e: KeyboardEvent) { if ( ... <input type="text" digitOnly placeholder="000" maxlength="3"> <input type="text" name="creditcard" id="creditcard_number" placeholder="000" maxlength="3" inputmode="numeric" pattern="[0-9]*" digitOnly>

The ng-required Directive in AngularJS is used to specify the required attribute of an HTML element. The input field in the form is required only if the expression inside the ng-required directive returns true. It is supported by <input>, <select> and <textarea> tags.

This article describes a method for automatically adding an asterisk (*) to required fields in a reactive form using Angular. It uses the built-in validators in Angular to determine if a field is required and then uses a component to add the asterisk to the label of the corresponding form field.

AngularJS ng-readonly Directive The ng-readonly directive sets the readonly attribute of a form field (input or textarea). The form field will be readonly if the expression inside the ng-readonly attribute returns true. The ng-readonly directive is necessary to be able to shift the value between true and false .

# Set the "required" Attribute using JavaScript Select the element. Use the setAttribute() method to set the required attribute. The setAttribute method will add the required attribute to the element.