kaspnilsson/iron-input

An input with data binding

Demo and API docs

<iron-input>

<iron-input> adds two-way binding and custom validators using Polymer.IronValidatorBehavior to <input>.

Changes in 2.0

Since type-extensions are not available in 2.0, <iron-input is a wrapper against a native input:

<iron-input>
  <input>
</iron-input>

Other changes:

• prevent-invalid-input and allowed-pattern had to be always used together; deleted prevent-invalid-input, so that only allowed-pattern is needed
• added an auto-validate property
• Note: imperatively setting the value attribute on the native <input> is not supported -- the native input does not fire an event in this case, so this update cannot be observed, and bind-value cannot be updated.

Two-way binding

By default you can only get notified of changes to an input's value due to user input:

<input value="{{myValue::input}}">

iron-input adds the bind-value property that mirrors the value property, and can be used for two-way data binding. bind-value will notify if it is changed either by user input or by script.

<iron-input bind-value="{{bindValue}}">
  <input value="{{value::input}}">
</iron-input>

Custom validators

You can use custom validators that implement Polymer.IronValidatorBehavior with <iron-input>.

<iron-input auto-validate validator="my-custom-validator">
  <input placeholder="only 'cat' is valid">
 </iron-input>

Stopping invalid input

It may be desirable to only allow users to enter certain characters. You can use the prevent-invalid-input and allowed-pattern attributes together to accomplish this. This feature is separate from validation, and allowed-pattern does not affect how the input is validated.

<!-- only allow characters that match [0-9] -->
<iron-input allowed-pattern="[0-9]">
  <input pattern="\d{5}">
</iron-input>