fix(autocomplete): unable to click to select items in IE

* Fixes being unable to select autocomplete items by clicking in IE. This was due to IE not setting the event.relatedTarget for blur events.
* Fixes potential issue if the user uses mat-option, instead of md-option.

Fixes #3351.

src/lib/autocomplete/autocomplete-trigger.ts

@@ -1,15 +1,18 @@
 import {
-    Directive,
-    ElementRef,
-    forwardRef,
-    Host,
-    Input,
-    NgZone,
-    Optional,
-    OnDestroy,
-    ViewContainerRef,
+  Directive,
+  ElementRef,
+  forwardRef,
+  Host,
+  Input,
+  NgZone,
+  Optional,
+  OnDestroy,
+  ViewContainerRef,
+  Inject,
+  ChangeDetectorRef,
 } from '@angular/core';
 import {ControlValueAccessor, NG_VALUE_ACCESSOR} from '@angular/forms';
+import {DOCUMENT} from '@angular/platform-browser';
 import {Overlay, OverlayRef, OverlayState, TemplatePortal} from '../core';
 import {MdAutocomplete} from './autocomplete';
 import {PositionStrategy} from '../core/overlay/position/position-strategy';
@@ -18,12 +21,13 @@ import {Observable} from 'rxjs/Observable';
 import {MdOptionSelectionChange, MdOption} from '../core/option/option';
 import {ENTER, UP_ARROW, DOWN_ARROW} from '../core/keyboard/keycodes';
 import {Dir} from '../core/rtl/dir';
+import {MdInputContainer} from '../input/input-container';
 import {Subscription} from 'rxjs/Subscription';
-import {Subject} from 'rxjs/Subject';
 import 'rxjs/add/observable/merge';
+import 'rxjs/add/observable/fromEvent';
+import 'rxjs/add/operator/filter';
 import 'rxjs/add/operator/startWith';
 import 'rxjs/add/operator/switchMap';
-import {MdInputContainer} from '../input/input-container';
 
 /**
  * The following style constants are necessary to save here in order
@@ -58,8 +62,8 @@ export const MD_AUTOCOMPLETE_VALUE_ACCESSOR: any = {
     '[attr.aria-expanded]': 'panelOpen.toString()',
     '[attr.aria-owns]': 'autocomplete?.id',
     '(focus)': 'openPanel()',
-    '(blur)': '_handleBlur($event.relatedTarget?.tagName)',
     '(input)': '_handleInput($event)',
+    '(blur)': '_onTouched()',
     '(keydown)': '_handleKeydown($event)',
   },
   providers: [MD_AUTOCOMPLETE_VALUE_ACCESSOR]
@@ -74,9 +78,6 @@ export class MdAutocompleteTrigger implements ControlValueAccessor, OnDestroy {
 
   private _positionStrategy: ConnectedPositionStrategy;
 
-  /** Stream of blur events that should close the panel. */
-  private _blurStream = new Subject<any>();
-
   /** Whether or not the placeholder state is being overridden. */
   private _manuallyFloatingPlaceholder = false;
 
@@ -101,8 +102,10 @@ export class MdAutocompleteTrigger implements ControlValueAccessor, OnDestroy {
 
   constructor(private _element: ElementRef, private _overlay: Overlay,
               private _viewContainerRef: ViewContainerRef,
+              private _changeDetectorRef: ChangeDetectorRef,
               @Optional() private _dir: Dir, private _zone: NgZone,
-              @Optional() @Host() private _inputContainer: MdInputContainer) {}
+              @Optional() @Host() private _inputContainer: MdInputContainer,
+              @Optional() @Inject(DOCUMENT) private _document: any) {}
 
   ngOnDestroy() {
     if (this._panelPositionSubscription) {
@@ -144,6 +147,12 @@ export class MdAutocompleteTrigger implements ControlValueAccessor, OnDestroy {
 
     this._panelOpen = false;
     this._resetPlaceholder();
+
+    // We need to trigger change detection manually, because
+    // `fromEvent` doesn't seem to do it at the proper time.
+    // This ensures that the placeholder is reset when the
+    // user clicks outside.
+    this._changeDetectorRef.detectChanges();
   }
 
   /**
@@ -152,9 +161,9 @@ export class MdAutocompleteTrigger implements ControlValueAccessor, OnDestroy {
    */
   get panelClosingActions(): Observable<MdOptionSelectionChange> {
     return Observable.merge(
-        this.optionSelections,
-        this._blurStream.asObservable(),
-        this.autocomplete._keyManager.tabOut
+      this.optionSelections,
+      this.autocomplete._keyManager.tabOut,
+      this._outsideClickStream
     );
   }
 
@@ -170,6 +179,18 @@ export class MdAutocompleteTrigger implements ControlValueAccessor, OnDestroy {
     }
   }
 
+  /** Stream of click outside of the autocomplete panel. */
+  private get _outsideClickStream(): Observable<any> {
+    if (this._document) {
+      return Observable.fromEvent(this._document, 'click').filter((event: MouseEvent) => {
+        let clickTarget = event.target as HTMLElement;
+        return this._panelOpen &&
+               !this._inputContainer._elementRef.nativeElement.contains(clickTarget) &&
+               !this._overlayRef.overlayElement.contains(clickTarget);
+      });
+    }
+  }
+
   /**
    * Sets the autocomplete's value. Part of the ControlValueAccessor interface
    * required to integrate with Angular's core forms API.
@@ -225,15 +246,6 @@ export class MdAutocompleteTrigger implements ControlValueAccessor, OnDestroy {
     }
   }
 
-  _handleBlur(newlyFocusedTag: string): void {
-    this._onTouched();
-
-    // Only emit blur event if the new focus is *not* on an option.
-    if (newlyFocusedTag !== 'MD-OPTION') {
-      this._blurStream.next(null);
-    }
-  }
-
   /**
    * In "auto" mode, the placeholder will animate down as soon as focus is lost.
    * This causes the value to jump when selecting an option with the mouse.
@@ -307,7 +319,7 @@ export class MdAutocompleteTrigger implements ControlValueAccessor, OnDestroy {
    * stemmed from the user.
    */
   private _setValueAndClose(event: MdOptionSelectionChange | null): void {
-    if (event) {
+    if (event && event.source) {
       this._clearPreviousSelectedOption(event.source);
       this._setTriggerValue(event.source.value);
       this._onChange(event.source.value);

src/lib/autocomplete/autocomplete.spec.ts

@@ -121,13 +121,12 @@ describe('MdAutocomplete', () => {
         });
       }));
 
-    it('should close the panel when blurred', async(() => {
+    it('should close the panel when input loses focus', async(() => {
       dispatchFakeEvent(input, 'focus');
       fixture.detectChanges();
 
       fixture.whenStable().then(() => {
-        dispatchFakeEvent(input, 'blur');
-        fixture.detectChanges();
+        dispatchFakeEvent(document, 'click');
 
         expect(fixture.componentInstance.trigger.panelOpen)
             .toBe(false, `Expected clicking outside the panel to set its state to closed.`);

src/lib/core/testing/event-objects.ts

@@ -40,7 +40,7 @@ export function createKeyboardEvent(type: string, keyCode: number) {
 
 /** Creates a fake event object with any desired event type. */
 export function createFakeEvent(type: string) {
-  let event  = document.createEvent('Event');
+  let event = document.createEvent('Event');
   event.initEvent(type, true, true);
   return event;
 }

src/lib/input/input-container.ts

@@ -339,6 +339,7 @@ export class MdInputContainer implements AfterViewInit, AfterContentInit {
   @ContentChildren(MdSuffix) _suffixChildren: QueryList<MdSuffix>;
 
   constructor(
+    public _elementRef: ElementRef,
     private _changeDetectorRef: ChangeDetectorRef,
     @Optional() private _parentForm: NgForm,
     @Optional() private _parentFormGroup: FormGroupDirective) { }