All-in-One Angular 9 Directives Cheatsheet

All-in-One Angular 9 Directives Cheatsheet

This article gives you the list of built-in directives in Angular with a small brief about each directive in dev-language with an example.

Angular Directives are used to manipute DOM (either structure or behaviour) based on the conditions provided.

First, let’s list out the types of Angular Directives:

  • Attribute Directives
  • Structural Directives

Attribute Directives

Below is the list:

[ngStyle]Attaches inline CSS styles (one or many) for the host HTML element.
[ngClass]Adds / removes CSS classes on an HTML element with or without an expression.
[ngComponentOutlet]Used for dynamic component declaration. Instantiates a single Component type and inserts its Host View into current View.
[ngTemplateOutlet]Inserts an embedded view from a prepared TemplateRef.
[ngPlural]Adds / removes DOM sub-trees based on a numeric value.
[ngPluralCase]Creates a view that will be added/removed from the parent ngPlural when the given expression matches the plural expression according to CLDR rules.
[ngSwitch]Works same as a switch statement in JavaScript. The expressions to match are provided by ngSwitchCase directives on views within the container, more description is provided below.

Structural Directives

Below is the list:

*ngIfTakes an expression, when it is truthy, it includes a template and vice versa.
*ngForLoops & renders a template for each item in an array. The host element will becomes the parent of the cloned templates.
*ngSwitchCaseWorks same as a case statement in JavaScript. This case should be enclosed within the ngSwitch container. When the expressions match, the given ngSwitchCase template will be rendered.
*ngSwitchDefaultIn case, if no ngSwitchCase expressions matches the ngSwitch expression, then given template in here will be rendered. This statement should always be the last statement in a ngSwitch.

That’s it!

Please let me know in the comment box, if you do not see any directives listed in this article or if you have any queries.

Masoom Ul Haq S
About author
Masoom Ul Haq S

Masoom is a Front-end Developer, a UX Engineer and Freelancer based in Bangalore, India. Like to develop differential and effective User Experiences for digital products using an amalgamation of latest technology and best practises.

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