##Polymer.IronValidatableBehavior
Use Polymer.IronValidatableBehavior
to implement an element that validates user input. Use the related Polymer.IronValidatorBehavior
to add custom validation logic to an iron-input.
By default, an <iron-form>
element validates its fields when the user presses the submit button. To validate a form imperatively, call the form's validate()
method, which in turn will call validate()
on all its children. By using Polymer.IronValidatableBehavior
, your custom element will get a public validate()
, which will return the validity of the element, and a corresponding invalid
attribute, which can be used for styling.
To implement the custom validation logic of your element, you must override the protected _getValidity()
method of this behaviour, rather than validate()
. See this for an example.
Changing the invalid
property, either manually or by calling validate()
will update the aria-invalid
attribute.