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What are the types of directives in AngularJS?

Jim Brown

What are the types of directives in AngularJS?

Attribute directives: Directive is active when matching attribute is found. Element directives: Directive is active when matching element is found. Component directives: Directive is active when matching component is found. CSS class directives: Directive is active when matching CSS style is found.

What is app directive in AngularJS?

The ng-app directive is a starting point of AngularJS Application. It initializes the AngularJS framework automatically. Typically ng-app directives should be placed at the root of an HTML document e.g. or tag, so that it can control the entire DOM hierarchy. However, you can place it in any DOM element.

Which directive allows us to use a form in AngularJS?

ng-form directive allows us to use a form in AngularJs.

How do you create a directive?

To create a directive, use the CLI command ng generate directive . The CLI creates src/app/highlight. directive. ts , a corresponding test file src/app/highlight.

Why do we use NG?

To sum up, ng-content is used to display children in a template, ng-container is used as a non-rendered container to avoid having to add a span or a div , and ng-template allows you to group some content that is not rendered directly but can be used in other places of your template or you code.

What language is AngularJS?

JavaScript
AngularJS is a JavaScript-based open-source front-end web framework for developing single-page applications….AngularJS.

Developer(s) Google
Written in JavaScript
Platform JavaScript engine
Size 167 kB production 1.2 MB development
Type Web framework

How is the ng-app directive used in AngularJS?

The ng-app directive starts an AngularJS Application. It defines the root element. It automatically initializes or bootstraps the application when the web page containing AngularJS Application is loaded. It is also used to load various AngularJS modules in AngularJS Application.

How are ng-bind and Ng-init directives related?

The variables initialized in ng-init are not attached to $scope object whereas ng-model properties are attached to $scope object. The ng-bind directive binds the model property declared via $scope or ng-model directive or the result of an expression to the HTML element. It also updates an element if the value of an expression changes.

How is the root element defined in AngularJS?

It defines the root element. It automatically initializes or bootstraps the application when the web page containing AngularJS Application is loaded. It is also used to load various AngularJS modules in AngularJS Application. In the following example, we define a default AngularJS application using ng-app attribute of a <div> element.

How to restrict W3 test directives in AngularJS?

When naming a directive, you must use a camel case name, w3TestDirective, but when invoking it, you must use – separated name, w3-test-directive: You can restrict your directives to only be invoked by some of the methods. By adding a restrict property with the value “A”, the directive can only be invoked by attributes:

What are the types of directives in AngularJS?

Jim Brown

What are the types of directives in AngularJS?

Attribute directives: Directive is active when matching attribute is found. Element directives: Directive is active when matching element is found. Component directives: Directive is active when matching component is found. CSS class directives: Directive is active when matching CSS style is found.

Which directive uses AngularJS application?

AngularJS | Directives

Directives Description
ng-app Start of AngularJS application.
ng-init Used to initialise a variable
ng-model ng-model is used to bind to the HTML controls
ng-controller Attaches a controller to the view

How do you use directive components?

To create a custom directive we have to replace @Component decorator with @Directive decorator. So, let’s get started with creating our first Custom Attribute directive. In this directive, we are going to highlight the selected DOM element by setting an element’s background color.

Which directive lets you modify the behavior of another directive?

Attribute directives
Attribute directives – change the appearance or behavior of an element, component, or another directive.

What is a directive AngularJS?

Directives are markers on a DOM element that tell AngularJS to attach a specified behavior to that DOM element or even transform the DOM element and its children. In short, it extends the HTML. Most of the directives in AngularJS are starting with ng- where ng stands for Angular.

What is directive syntax?

Mapfile directives exist to specify many aspects of the output object. These directives share a common syntax, using name value pairs for attributes, and {…} directive ; The next form is a directive name with a value, or a white space separated list of values.

How are angular directives used in the HTML?

Angular directives are used to extend the power of the HTML by giving it new syntax. Each directive has a name — either one from the Angular predefined like ng – repeat, or a custom one which can be called anything. And each directive determines where it can be used: in an element, attribute, class or comment.

What does module.directive do in JavaScript?

module.directivetakes the normalizeddirective name followed by a factory function. This factory function should return an object with the different options to tell $compilehow the directive should behave when matched. The factory function is invoked only once when the compilermatches the directive for the first time.

How does data binding work in Angular application?

Data binding: For data binding Angular supports property, event and attribute binding from component typescript to template view, with ngModel directive Angular also provides two-way data binding. Directives: In Angular directives are way to instruct DOM.

What’s the difference between AngularJS and angular app?

AngularJS has a set of built-in directives which offers functionality to your applications. AngularJS also lets you define your own directives. AngularJS directives are extended HTML attributes with the prefix ng-. The ng-app directive initializes an AngularJS application.