Sep 24, 2013 · Required This attribute specifies that the user must fill in a value before submitting a form. It cannot be used when the type attribute is hidden, image, or a button type (submit, reset, or …

Source: Form fields — Required vs Optional by Jordane Sanson Why use optional fields is always better than required : An asterisk is obvious to you, not to everyone, believe me, there are always some …

Find out how to make a field required in HTML forms using the "required" attribute and ensure proper validation for user inputs.

1024 TL;DR: Set the required attribute for at least one input of the radio group. Setting required for all inputs is more clear, but not necessary (unless dynamically generating radio-buttons). To group radio …

edName.attributes.required = [object Attr] That's because required in that code is an attribute object, not a string; attributes is a NamedNodeMap whose values are Attr objects. To get the value of one of …

As ms2ger has pointed out, the required attribute is a boolean attribute, and here's what the HTML 5 spec has to say about those: Note: The values "true" and "false" are not allowed on boolean attributes.

Explains how to use the "required" attribute in HTML forms for input validation, including examples and best practices.

Required is a data annotation for the view. The view will require it to have a value prior to accepting a form post. That the value is nullable is related to what is allowed in the database. A value may be null …

I noticed that required and optional have been removed in the new syntax. Why were required / optional removed in proto3? Such keywords introduce constraints which should improve robustness.

Oct 18, 2018 · I want to apply conditional validation on some properties based on some other form values. I have referred some answers Angular2: Conditional required validation, but those are not …