[](https://travis-ci.org/PolymerElements/iron-input) _[Demo and API docs](https://elements.polymer-project.org/elements/iron-input)_ ##<iron-input> `` adds two-way binding and custom validators using `Polymer.IronValidatorBehavior` to ``. ### Two-way binding By default you can only get notified of changes to an `input`'s `value` due to user input: ```html ``` `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. ```html ``` ### Custom validators You can use custom validators that implement `Polymer.IronValidatorBehavior` with ``. ```html ``` ### 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. ```html ```