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docs: backport fix to event-binding example for production build (#28423)

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Examples are run in production mode and the methods weren't optional.

PR Close #28423
This commit is contained in:
Brandon 2019-02-19 16:00:03 +00:00 committed by Matias Niemelä
parent e8ed37a0e7
commit a5cbfa2aab
1 changed files with 3 additions and 3 deletions
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6
aio/content/examples/event-binding/src/app/app.component.ts
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@ -11,17 +11,17 @@ export class AppComponent {
currentItem = { name: 'teapot'} ; currentItem = { name: 'teapot'} ;
clickMessage = ''; clickMessage = '';
onSave(event: KeyboardEvent) { onSave(event?: KeyboardEvent) {
const evtMsg = event ? ' Event target is ' + (<HTMLElement>event.target).textContent : ''; const evtMsg = event ? ' Event target is ' + (<HTMLElement>event.target).textContent : '';
alert('Saved.' + evtMsg); alert('Saved.' + evtMsg);
if (event) { event.stopPropagation(); } if (event) { event.stopPropagation(); }
} }
deleteItem(item: Item) { deleteItem(item?: Item) {
alert(`Delete the ${item}.`); alert(`Delete the ${item}.`);
} }
onClickMe(event: KeyboardEvent) { onClickMe(event?: KeyboardEvent) {
const evtMsg = event ? ' Event target class is ' + (<HTMLElement>event.target).className : ''; const evtMsg = event ? ' Event target class is ' + (<HTMLElement>event.target).className : '';
alert('Click me.' + evtMsg); alert('Click me.' + evtMsg);
} }