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docs: add note that when ngOnInit not used (#34619) 

In some examples ngOnInit was missing added note to tell when it is missing.

Fixes #34562

PR Close #34619
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ajitsinghkaler 2020-01-10 09:21:32 +05:30 committed by atscott
parent e88d652f2a
commit f6dee72a88
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aio/content/start/index.md
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@ -311,6 +311,13 @@ To make the "Notify Me" button work, you need to configure two things:
1. In the component class, define a property named `notify` with an `@Output()` decorator and an instance of `EventEmitter()`. This allows the product alert component to emit an event when the value of the notify property changes.
<div class="alert is-helpful">
When the Angular CLI generates a new component, it includes an empty constructor, the `OnInit` interface, and the `ngOnInit()` method.
Since the following example isn't using them, they are omitted here for brevity.
</div>
<code-example path="getting-started/src/app/product-alerts/product-alerts.component.ts" header="src/app/product-alerts/product-alerts.component.ts" region="input-output"></code-example>
1. In the product alert template, `product-alerts.component.html`, update the "Notify Me" button with an event binding to call the `notify.emit()` method.