What is the purpose of $apply?
Please select exactly one correct alternative.
Answer
$apply() is used to execute an expression in angular from outside of the angular framework.
What is the purpose of $digest()?
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Answer
Processes all of the watchers of the current scope and its children.
What is the purpose of $watch()?
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Answer
It registers a listener callback to be executed whenever the watchExpression changes.
What is a digest cycle?
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Answer
The digest cycle processes all of the watchers of the current scope and its children. Because a watcher's listener can change the model, the $digest() keeps calling the watchers until no more listeners are firing.
What are differences between $apply and $digest?
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Answer
On $digest, AngularJS evaluates the scope model. On $apply, AngularJS triggers a $digest cycle. If an expression is passed to $apply(), it is evaluated first, before $digest() is executed.
What are differences between $scope and $rootScope?
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Answer
Each Angular application has exactly one root scope, but may have several child scopes. When Angular evaluates {{name}}, it first looks at the scope associated with the given element for the name property. If no such property is found, it searches the parent scope and so on until the root scope is reached.
Why should you use $scope variables instead of regular JavaScript (var) variables?
Please select exactly one correct alternative.
What is meant by $$phase?
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Answer
A method that AngularJS uses to start the digest cycle.
What does $setValidity() do?
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Answer
It changes the validity state, and notify the form.This method can be called within $parsers/$formatters or a custom validation implementation.
What is AngularJS?
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Answer
AngularJS is an open-source web application framework written in JavaScript, maintained by Google and a community of individual developers and corporations. It is designed for developing single-page applications (SPA's).
What is a Single Page Application?
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Answer
A single-page application is a web site that fits on a single web page. Using AngularJS, you can create Single Page Applications.
What does MVC stand for?
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Answer
MVC stands for Model View Controller. It is a solution pattern allowing to develop applications with loose coupling and separation of concern which in turn improves testability, maintainability and extendibility of the software.
What does MVP stand for?
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Answer
MVP stands for Model View Presenter. It is a solution pattern allowing to develop applications with loose coupling and separation of concern which in turn improves testability, maintainability and extendibility of the software.
What does MVVM stand for?
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Answer
MVVM stands for Model View ViewModel. It is a solution pattern allowing to develop applications with loose coupling and separation of concern which in turn improves testability, maintainability and extendibility of the software.
What happens?
Consider the following situation:
You have implemented an AngularJS application in which you use the following code fragment:
You load the application from your folder into your browser.
What happens?
You have implemented an AngularJS application in which you use the following code fragment:
$http.get("data.json").success(function(data) { } );
The application resides in a folder on your laptop.You load the application from your folder into your browser.
What happens?
Please select exactly one correct alternative.
Answer
None of the above is the correct answer because the application throws an error because you have to use a web server (and the http protocol) to load the "data.json" data file.
What are advantages of Single Page Applications?
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Answer
During usage of the web application, the page is dynamically changed, and resources are dynamically loaded and added to the page as necessary without the page being reloaded. This results in a more fluent user experience compared to classic web pages.
What are AngularJS Directives?
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Answer
AngularJS directives are HTML attributes with an "ng" prefix, like ng-init, ng-app and ng-model.
Which of the statements on AngularJS Directives below are correct?
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What is meant by "scope" in AngularJS?
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Answer
Scope refers to the application model. It acts like glue between application controller and the view. Scopes are arranged in hierarchical structure and impersonate the Document Object Model (DOM) structure of the application. It can watch expressions and propagate events.
What is meant by "services" in AngularJS?
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Answer
In AngularJS "services" are the Singleton objects or functions that are used for carrying out specific tasks. It holds some business logic and these function can be called as controllers, directive, filters and so on.
When should you use AngularJS services?
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Answer
In AngularJS "services" are the Singleton objects or functions that are used for carrying out specific tasks. It holds some business logic and these function can be called as controllers, directive, filters and so on. You use them for implementing specific functionality that is used regularly in your JavaScript code. This makes your controllers' code "lean".
What is AngularJS "binding" or "data binding"?
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Answer
Data binding is the automatic synchronization (update)of data between the model and view components. The view is a projection of the model at all times. When the model changes, the view reflects the change, and vice versa. So when you update a control's value and this control is bound to a variable, the variable is changed automatically as well.
What is an AngularJS "expression"?
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Answer
AngularJS expressions are JavaScript-like code snippets that are usually placed in bindings such as {{ expression }}. There are, however, some differences with JavaScript expressions.
What are valid differences between AngularJS expressions and JavaScript expressions?
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Which statements are correct on AngularJS directives?
Please select none ore more correct alternatives.
Answer
An AngularJS directive is like a marker on a DOM element which attaches a special behavior to it. Directives are markers on a DOM element (such as an attribute, element name, comment or CSS class) that tell AngularJS's HTML compiler ($compile) to attach a specified behavior to that DOM element or even transform the DOM element and its children.
What is the difference between one way binding and two way binding?
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Answer
In one way binding, changes in the model will be reflected in the view. In addition to this, in two way binding, changes in the view will be reflected in the model.
What is Angular Protractor and what is it used for?
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Answer
Protractor is an end-to-end test framework for AngularJS applications. Protractor runs tests against your application running in a real browser, interacting with it as a user would.
What is the purpose of AngularJS routes?
Please select exactly one correct alternative.
Answer
AngularJS routing enables to create different URLs for different content in your web application. Each URL in AngularJS is called a route. Having different URLs for different content enables the user to bookmark URLs to specific content, and share those URLs with others, for example:
- http://angularsap.nl/index.html#contact
- http://angularsap.nl/index.html#news
- http://angularsap.nl/index.html#people
What is string interpolation in AngularJS?
Please select exactly one correct alternative.
Answer
In AngularJS, during the compilation process the compiler matches text and attributes using the interpolate service to see if they contains embedded expressions. As part of the normal digest cycle, these expressions are updated and registered as watches.
In which order AngularJS compiles HTML?
Please select exactly one correct alternative.
Answer
Compilation of HTML process occurs in the following steps:
- Using the standard browser API, first the HTML is parsed into DOM
- By using the call to the $compile() method, compilation of the DOM is performed. The method traverses the DOM and matches the directives.
- Link the template with scope by calling the linking function returned from the previous step
What is AngularJS linking?
Please select exactly one correct alternative.
Answer
Linking combines the directives with a scope and produce a live view. For registering DOM listeners as well as updating the DOM, the link function is responsible. After the template is cloned it is executed.
There are two linking functions:
There are two linking functions:
- Pre-linking function: Pre-linking function is executed before the child elements are linked. It is not considered the safe way for DOM transformation.
- Post linking function: Post linking function is executed after the child elements are linked. It is safe to do DOM transformation by post-linking function
What is the purpose of the AngularJS $injector service?
Please select none ore more correct alternatives.
Answer
The $injector service is used to retrieve object instances as defined by provider, instantiate types, invoke methods, and load modules.
What is the difference between linking and compiling in AngularJS?
Please select exactly one correct alternative.
Answer
The compile function is used for template DOM manipulation and collect all of the directives. The link function is used for registering DOM listeners as well as instance DOM manipulation. It is executed once the template has been cloned.
What is the purpose of the AngularJS $injector service?
Please select exactly one correct alternative.
Answer
The $injector service is used to retrieve object instances as defined by provider, instantiate types, invoke methods, and load modules.
What is the factory method in AngularJS?
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Answer
For creating a directive, the factory method is used. It is invoked only once, when compiler matches the directive for the first time. By using $injector.invoke the factory method is invoked.
What is Dependency Injection?
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Answer
Dependency Injection (DI) is a software design pattern that deals with how components get hold of their dependencies. The Angular injector subsystem is in charge of creating components, resolving their dependencies, and providing them to other components as requested.
Which of the statements below on CSS classes added to AngularJS forms are valid?
Please select none ore more correct alternatives.
Answer
AngularJS ngModel adds these CSS classes to allow styling of form as well as control:
- ng-valid is set if the form is valid.
- ng-invalid is set if the form is invalid.
- ng-pristine is set if the form is pristine.
- ng-dirty is set if the form is dirty.
- ng-submitted is set if the form was submitted.
Which of the statements below on AngularJS scopes are valid?
Please select none ore more correct alternatives.
In what way(s), an object or function can get a hold of its dependencies?
Please select none ore more correct alternatives.
Answer
These are the ways that object uses to hold of its dependencies:
- Typically using the new operator, a dependency can be created.
- By referring to a global variable, a dependency can be looked up.
- A dependency can be passed into where ever it is required.
Which of the statements below are correct on AngularJS scopes?
Please select none ore more correct alternatives.
Answer
Each AngularJS application consist of one (1) root scope but may have several child scopes. As child controllers and some directives create new child scopes, the application can have multiple scopes. When new scopes are formed or created, they are added as a children of their parent scope. This is similar to DOM in which a hierarchical structure can be created as well.
What is the default behaviour of the ng-init directive?
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What is an AngularJS promise?
Please select exactly one correct alternative.
Answer
An AngularJS promise (or just a JavaScript promise) is a way for handling asynchronous operations.
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