March 2017
Intermediate to advanced
821 pages
18h 21m
English
Content preview from JavaScript: Moving to ES2015Become an O’Reilly member and get unlimited access to this title plus top books and audiobooks from O’Reilly and nearly 200 top publishers, thousands of courses curated by job role, 150+ live events each month,
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Component lifecycle methods
When a
component tag appears, Angular 2 creates an instance of a component, renders it, checks for changes in attributes, checks for changes in state, and destroys it when it's no longer needed. These steps together form the lifecycle of a component.
Angular 2 lets us register methods that are called at various stages of the component lifecycle.
Here are the various lifecycle methods provided by Angular 2; lifecycle hooks are explained in the order they occur:
ngOnChanges: This is invoked whenever the attributes of a component change. It's also invoked after the attributes of a component are resolved for the first time after the creation of a new instance of the component. It's invoked after the state has been changed ...
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I wanted to learn C and C++, but it didn't click for me until I picked up an O'Reilly book. When I went on the O’Reilly platform, I was astonished to find all the books there, plus live events and sandboxes so you could play around with the technology.Addison B.
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