December 2016
Intermediate to advanced
841 pages
17h
English
Content preview from TypeScript: Modern JavaScript DevelopmentBecome 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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Adding conditions to the template
The event handler in the previous section sets the property collapsed to false but that does not modify the template. In normal code, we would have written if (this.collapsed) { ... }. In templates, we cannot use that, but we can use ngIf.
Directives
A directive is an extension to normal HTML tags and attributes. It can define custom behavior. A custom component, such as the About page, can be seen as a directive too. The ngIf condition is a built-in directive in Angular. It is a custom attribute that displays the content if the specified value is true.
The template tag
If a piece of a component needs to be shown a variable an amount of times, you can wrap it in a template tag. Using the ngIf (or ngFor) directive, ...
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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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