The data items displayed by vaadin-combo-box can be set and accessed using the
items property. The items may be assigned with data-binding, using an attribute or the
JavaScript property directly. Notice that only an array of String values or Objects
with a toString() method is currently supported.
Use the label attribute to provide a label for the element.
Typing some text into the vaadin-combo-box's input field will filter
the values defined in the items property and show only items that
contain the value in the input field.
var combobox = combobox || document.querySelector('vaadin-combo-box');
// The elements is an array of String values.
combobox.items = elements;