Public imperative API

It's either this or `props.inputRef`, unless we want to wait for
facebook/react#4213

Author: edwardglapinski729

lib/Autocomplete.js

@@ -4,6 +4,16 @@ const { findDOMNode } = require('react-dom')
 const scrollIntoView = require('dom-scroll-into-view')
 
 let _debugStates = []
+const IMPERATIVE_API = [
+  'blur',
+  'checkValidity',
+  'click',
+  'focus',
+  'select',
+  'setCustomValidity',
+  'setSelectionRange',
+  'setRangeText',
+]
 
 let Autocomplete = React.createClass({
 
@@ -189,6 +199,11 @@ let Autocomplete = React.createClass({
     }
   },
 
+  exposeAPI(el) {
+    this.refs.input = el
+    IMPERATIVE_API.forEach(ev => this[ev] = (el && el[ev] && el[ev].bind(el)))
+  },
+
   maybeScrollItemIntoView() {
     if (this.isOpen() && this.state.highlightedIndex !== null) {
       const itemNode = this.refs[`item-${this.state.highlightedIndex}`]
@@ -454,7 +469,7 @@ let Autocomplete = React.createClass({
           aria-autocomplete="list"
           aria-expanded={open}
           autoComplete="off"
-          ref={e => this.refs.input = e}
+          ref={this.exposeAPI}
           onFocus={this.composeEventHandlers(this.handleInputFocus, inputProps.onFocus)}
           onBlur={this.composeEventHandlers(this.handleInputBlur, inputProps.onBlur)}
           onChange={this.handleChange}

lib/__tests__/Autocomplete-test.js

@@ -427,3 +427,21 @@ describe('Autocomplete#renderMenu', () => {
     expect(wrapper.find(Item).length).toBe(50)
   })
 })
+
+describe('Public imperative API', () => {
+  it('should expose select APIs available on HTMLInputElement', () => {
+    const tree = mount(AutocompleteComponentJSX({ value: 'foo' }))
+    const ac = tree.get(0)
+    expect(typeof ac.focus).toBe('function')
+    expect(ac.isInputFocused()).toBe(false)
+    ac.focus()
+    expect(ac.isInputFocused()).toBe(true)
+    expect(typeof ac.setSelectionRange).toBe('function')
+    ac.setSelectionRange(1, 2)
+    expect(tree.find('input').get(0).selectionStart).toBe(1)
+    expect(tree.find('input').get(0).selectionEnd).toBe(2)
+    expect(typeof ac.blur).toBe('function')
+    ac.blur()
+    expect(ac.isInputFocused()).toBe(false)
+  })
+})