HTML <input> required egenskab

HTML <input> etiket

Definition og brug

required Egenskab bestemmer, at inputfelt skal udfyldes før indsendelse.

required Egenskab er en boolean egenskab.

If this attribute is used, the field is required (or optional).

Note:required Properties apply to the following input types:

  • text
  • search
  • url
  • tel
  • email
  • password
  • date pickers
  • number
  • checkbox
  • radio
  • file

Example

HTML form with a required input field:

<form action="/action_page.php">
  <label for="username">Username:</label>
  <input type="text" id="username" name="username" required>
  <input type="submit">
</form>

Try it yourself

Syntax

<input required>

Browser support

Chrome Edge Firefox Safari Opera
Chrome Edge Firefox Safari Opera
5.0 10.0 4.0 10.1 9.6

Note:required Properties are new attributes in HTML5.

HTML <input> etiket