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Essential Angular

You're reading from   Essential Angular Fast paced guide to Front-end web development with Angular

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Product type Paperback
Published in May 2017
Publisher Packt
ISBN-13 9781788293761
Length 108 pages
Edition 1st Edition
Tools
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Authors (3):
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Narwhal Technologies Inc Narwhal Technologies Inc
Author Profile Icon Narwhal Technologies Inc
Narwhal Technologies Inc
Jeff Cross Jeff Cross
Author Profile Icon Jeff Cross
Jeff Cross
Victor Savkin Victor Savkin
Author Profile Icon Victor Savkin
Victor Savkin
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Toc

Change Detection

Two phases

Angular separates updating the application model and reflecting the state of the model in the view into two distinct phases. The developer is responsible for updating the application model. Angular via bindings, by means of change detection, is responsible for reflecting the state of the model in the view. The framework does it automatically on every VM turn.

Event bindings, which can be added using the () syntax, can be used to capture a browser event or component output to execute some function on a component or a directive. So they often trigger the first phase.

Property bindings, which can be added using the [] syntax, should be used only for reflecting the state of the model in the view.

As we have learned, an Angular application consists of nested components, so it will always have a component tree. Let's say for this app it looks as follows:

Next, define the application model...

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