Use the ref binding command to create a reference to a DOM element. The ref command's most basic syntax is ref="expression". When the view is data-bound the specified expression will be assigned the DOM element.
<template>
<input type="text" ref="nameInput"> ${nameInput.value}
</template>
The ref command has several qualifiers you can use in conjunction with custom elements and attributes :
* element.ref="expression" : create a reference to the DOM element (same as ref="expression").
* attribute-name.ref="expression" : create a reference to a custom attribute's view-model.
* view-model.ref="expression" : create a reference to a custom element's view-model.
* view.ref="expression" : create a reference to a custom element's view instance (not an HTML Element).
* controller.ref="expression" : create a reference to a custom element's controller instance.
