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fix(dialog): leaking MdDialogContainer references #2944

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Merged
merged 2 commits into from
Mar 29, 2017
Merged

fix(dialog): leaking MdDialogContainer references #2944

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b0a9fde
fix(dialog): leaking MdDialogContainer references
crisbeto Feb 4, 2017
d1186ab
chore: add comment about `this` usage in zone
crisbeto Mar 10, 2017
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17 changes: 8 additions & 9 deletions src/lib/dialog/dialog-container.ts
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Original file line number Diff line number Diff line change
Expand Up @@ -109,10 +109,8 @@ export class MdDialogContainer extends BasePortalHost implements OnDestroy {
// If were to attempt to focus immediately, then the content of the dialog would not yet be
// ready in instances where change detection has to run first. To deal with this, we simply
// wait for the microtask queue to be empty.
this._ngZone.onMicrotaskEmpty.first().subscribe(() => {
this._elementFocusedBeforeDialogWasOpened = document.activeElement as HTMLElement;
this._focusTrap.focusFirstTabbableElement();
});
this._elementFocusedBeforeDialogWasOpened = document.activeElement as HTMLElement;
this._focusTrap.focusFirstTabbableElementWhenReady();
}

/**
Expand All @@ -137,16 +135,17 @@ export class MdDialogContainer extends BasePortalHost implements OnDestroy {
// the dialog was opened. Wait for the DOM to finish settling before changing the focus so
// that it doesn't end up back on the <body>. Also note that we need the extra check, because
// IE can set the `activeElement` to null in some cases.
this._ngZone.onMicrotaskEmpty.first().subscribe(() => {
let toFocus = this._elementFocusedBeforeDialogWasOpened as HTMLElement;
let toFocus = this._elementFocusedBeforeDialogWasOpened as HTMLElement;

// We need to check whether the focus method exists at all, because IE seems to throw an
// exception, even if the element is the document.body.
// We shouldn't use `this` inside of the NgZone subscription, because it causes a memory leak.
let animationStream = this._onAnimationStateChange;

this._ngZone.onMicrotaskEmpty.first().subscribe(() => {
if (toFocus && 'focus' in toFocus) {
toFocus.focus();
}

this._onAnimationStateChange.complete();
animationStream.complete();
});
}
}