Top 100+ Aurelia Interview Questions And Answers
Question 1. In Aurelia, What Does System.Js Contains?
Answer :
The scripts/gadget.Js is a modern JavaScript module loader. Since Aurelia itself is written as modules, it encourages to create code in a modular style. To use modules in ES 2016, we need a loader for expertise modular code. That is the purpose of SystemJS. It locates modules, knows their dependencies and guarantees that the whole thing is properly loaded at runtime.
Question 2. Explain The Purpose Of Constructor() In Aurelia?
Answer :
Constructor technique is used for initializing object created with a category. This method is referred to as first. If we don't specify this technique, the default constructor might be used.
For example
export magnificence App
constructor()
this.Counter = 1;
here we're initializing teh counter belongings to one inside the constructor. Later we are able to use this within the view and show the fee as 1 like
$counter
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Question three. Explain System.Import('aureliabootstrapper')? In Aurelia
Answer :
The SystemJS module loader furnished the SystemJS item. Its has a technique import which tells the loader to load/import a module aureliabootstrapper which is living in the aureliamiddle.Min.Js. Using this module, Aurelia load the framework, configure and run the utility.
Question four. What Does <body Aureliaapp="src/main"> Signifies?
Answer :
On the frame tag, there's an aureliaapp attribute concentrated on to src/predominant. This tells Aurelia's bootstrapper to load the app viewmodel and it's view and additionally the host HTML detail in which the software could be rendered.
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Question five. Identity The Features Of Aurelia?
Answer :
Aurelia is relatively modular and designed to be customized easily.We can add or do away with any tools that the framework offers and can also add every other equipment that aren't part of the framework. E.G we can effortlessly integrate with jQuery, React , Google MapAPI and so on. In Aurelia Each Aurelia library is launched with its own d.Ts documents. They have professional TypeScript novice kits and production first-class starter kits
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Question 6. What Is The Significance Of Index.Html In Aurelia?
Answer :
index.Html is deafult web page of the app like in maximum of the HTML based totally apps. It is an area where scripts and stylesheets are loaded.It seems as below
<!DOCTYPE html>
<html>
<head>
<title>Aurelia</title>
</head>
<body aurelia?app="src/main">
<script src="scripts/system.Js"></script>
<script src="scripts/config?typescript.Js"></script>
<script src="scripts/aurelia?core.Min.Js"></script>
<script>
System.Import('aurelia?bootstrapper');
</script>
</body>
</html>
We also can configure the programming language selection.Let's modify our programming language. The default is pointing to TypeScript.
<script src="scripts/config?typescript.Js"></script>
However, we will pick out ESNext. So we want to exchange that to <script src="scripts/config?esnext.Js"></script>
So our index.Html will now look like
<!DOCTYPE html>
<html>
<head>
<title>Aurelia</title>
</head>
<body aurelia?app="src/main">
<script src="scripts/system.Js"></script>
<script src="scripts/config?esnext.Js"></script>
<script src="scripts/aurelia?core.Min.Js"></script>
<script>
System.Import('aurelia?bootstrapper');
</script>
</body>
</html>
Question 7. What Is Aurelia?
Answer :
Aurelia is a current, open supply client aspect JavaScript framework for net and mobile utility improvement. It emphasis on simple conventions and ES6/ES7 guide. It is written using ECMAScript 2016. Using Aurelia, we are able to construct packages the use of modules, lessons, decorators and many others.
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Question 8. What Are The Features Of Aurelia?
Answer :
Aurelia Features :
Components : Component are constructing blocks of Aurelia framework. It is composed of HTML view and JavaScript view-model pairs.
Web Standards : This is one of the cleanest current frameworks, absolutely focused on internet standards without needless abstractions.
Extensible : The framework offers an smooth way to integrate with the other wished tools.
Commercial Support : Aurelia gives industrial and corporation assist. It is official made from Durandal Inc.
License : Aurelia is open sourced and certified underneath MIT licence.
Question nine. What Are The Aurelia Advantages And Limitations?
Answer :
Aurelia Advantages :
Aurelia is very clean. If you observe the frameworks conventions, you may recognition on your app with out the framework getting to your way.
It is also easily extensible. You can upload or do away with any gear that the framework gives and you could also upload another gear that aren't a part of the framework.
Aurelia is very smooth to work with. It is directed towards builders revel in. This will save you lots of time and complications on the street.
The framework itself is directed toward web requirements so you will always stay updated with cutting-edge principles.
Aurelia do not have the largest network obtainable, but it is very agile, knowledgeable and inclined to assist within the quick notice.
Aurelia Limitations :
There is no any genuine boundaries. Framework is powerfull and smooth to work with. Someone ought to suppose that smaller community may couse some problems on the road, but we did not have those kind of troubles.
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Question 10. Explain Component Life Cycle Of Aurelia?
Answer :
Aurelia use thing lifecycle strategies to permit us manipulating element lificycle.
Constructor() − Constructor technique is used for initializing object created with a class. This method is referred to as first. If you do not specify this method, the default constructor might be used.
Created(owningView, myView) − This is called as soon as the view and view-version are created and connected to controller. This method takes arguments. The first one is the view wherein the element is asserted (owningView). The 2d one aspect view (myView).
Bind(bindingContext, overrideContext) − At this factor of time the binding has started. The first argument represents binding context of the component. The second one is overrideContext. This argument is used for adding additional contextual homes.
Connected() − Attached technique is invoked once the issue is hooked up to the DOM.
Indifferent() − This method is opposite to connected. It is invoked whilst element is removed from the DOM.
Unbind() &minu; The remaining lifecycle approach is unbind. It is known as while the element is unbound.
The lifecycle techniques are useful when you need to have better manage over your factor. You can use them whilst you need to trigger some functionalities at sure factor of element lifecycle.
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Question 11. Explain The Components Of Aurelia?
Answer :
Components are primary constructing blocks of Aurelia framework.
Simple Component :
Each factor consists of view-model that is written in JavaScript and examine, written in HTML. You can see our view-model definition below. This is an ES6 instance however you may also use TypeScript.
App.Js
export magnificence MyComponent
header = "This is Header";
content material = "This is content material";
We can bind our values to the view as shown in example under. $header syntax will bind the defined header fee from MyComponent. The equal idea is implemented for content material.
App.Html
$header
$content material
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Question 12. How To Create Custom Elements In Aurelia?
Answer :
Aurelia offers a manner to add additives dynamically. You can reuse single thing on exceptional pars of your app with out need for including HTML multiple times.
Step 1 - Create custom thing
Let's create new additives directory inside src folder.
C:UsersusernameDesktopaureliaAppsrc>mkdir additives
Inside this directory we are able to create custom-element.Html. This element may be inserted later on our HTML page.
Custom-factor.Html
This is a few text from dynamic thing...
Step 2 - Create major element
We will create simple element in app.Js. It may be used to render header and footer textual content on display.
App.Js
export class MyComponent
header = "This is Header";
content = "This is content material";
Step 3 - Add custom factor
Inside our app.Html document, we want to require the custom-issue.Html in an effort to insert it dynamically. Once we do that, we are able to upload new element custom-aspect.
App.Html
$header
$content
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Question 13. Explain About Standard Plugins?
Answer :
Standard Plugins : If you are using default configuration, preferred set of plugins might be available.
DefaultBindingLanguage() − This plugin that gives an easy manner to attach view-version with view. You already noticed one manner statistics-binding syntax ($someValue). Even though you could use some other binding language, it's far encouraged exercise to apply default binding language.
DefaultResources() − Default resourses offers us some primitive constructs like if, repeat, compose and so on. You can even construct those constructs in your own, but considering they are so typically used, Aurelia already created it inside this library.
Router() − Most of the packages use some kind of routing. That is why Router is part of the standard plugins. You can check greater about routing in one among our subsequent chapters.
History() − History plugin is generally used collectively with router.
EventAggregator() − This plugin is used for cross issue verbal exchange. It handles publishing and subscribing to messages or channels internal your app.
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Question 14. Explain About Official Plugins?
Answer :
Official Plugins : These plugins are not a part of the default configuration but are often used.
Fetch() − Fetch plugin is used for managing HTTP requests. You can use a few different AJAX library in case you need.
AnimatorCSS() − This plugin gives a manner of managing CSS animations.
Animator-pace() − Instead of CSS animations you can use Velocity animation library. This plugins enables to use Velocity interior Aurelia apps.
Dialog() − Dialog plugin offers exceedingly customizable modal window.
I18n() − This is the plugin for internalization and localization.
Ui-virtualization() − Virtualization is useful library for coping with big performance heavy UI obligations.
Validation() − Use this plugin whilst you need to validate your records.
Question 15. How Do We Install Plugins?
Answer :
Installing Plugins : If, for instance, we need to use animator-css and animator-velocity, we want to put in it first.
C:UsersusernameDesktopaureliaApp>jspm set up aurelia-animator-css
C:UsersusernameDesktopaureliaApp>jspm install aurelia-animator-speed
In our final bankruptcy we showed you how to use manual configuration. We can add our plugins in predominant.Js file.
Important.Js
export characteristic configure(aurelia)
aurelia.Use
.DefaultBindingLanguage()
.DefaultResources()
.DevelopmentLogging()
.Router()
.History()
.EventAggregator()
.Plugin('aurelia-animatorCSS')
.Plugin('aurelia-animator-velocity')
aurelia.Start().Then(() => aurelia.SetRoot());
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Question 16. Explain About Binding System In Aurelai?
Answer :
Aurelia has its own records-binding gadget.
Simple Binding :
You already saw easy binding in some of our preceding chapters. $... Syntax is used to hyperlink veiw-version and look at.
App.Js
export magnificence App
constructor()
this.MyData = 'Welcome to Aurelia app!';
app.Html
$myData
Two way Binding : The splendor of Aurelia is in its simplicity. The -way information binding is mechanically set while we bind to input fields.
App.Js
export class App
constructor()
this.MyData = 'Enter a few textual content!';
app.Html
$myData
Now we've our view-version and view linked. Whenever we input a few text inside input area, the view may be up to date.
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Question 17. What Are The Binding Behaviour In Aurelia?
Answer :
Binding conduct as a filter out which can change binding facts and show it in distinct layout.
Throttle : This conduct is used to set how frequently must a few binding replace. We can use throttle to slow down fee of updating input view-version. Consider the example from our remaining chapter. The default fee is two hundred ms. We can alternate that to 2 sec by including & throttle:2000 to our input.
App.Js
export elegance App
constructor()
this.MyData = 'Enter some text!';
app.Html
$myData
Debounce : debounce is almost similar to throttle. The distinction is that debounce will update binding after user stopped typing. Example under will update binding if consumer stops typing for 2 seconds.
App.Js
export class App
constructor()
this.MyData = 'Enter a few textual content!';
app.Html
$myData
oneTime : oneTime is the most efficient conduct overall performance wise. You have to continually use it while you recognise that facts have to be sure most effective as soon as.
App.Js
export elegance App
constructor()
this.MyData = 'Enter some text!';
app.Html
$myData
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Question 18. How To Convert Date In Aurelia?
Answer :
Convert Date : When we want to transform default date fee to some particular layout, we can use momentJS library. This is small library used for manipulating dates.
C:UsersusernameDesktopaureliaApp>jspm deploy second
Let's create new report converters.Js. We will use this document to feature converter particular code. Use the following command or create the document manually.
C:UsersusernameDesktopaureliaApp>contact converters.Js
converter.Js : Inside this file we are able to import second library and set DateFormatValueConverter to return only month, day and 12 months values with out extra facts. Important thing to note is that Aurelia can apprehend any magnificence that ends with ValueConverter. This is why our elegance name is DateFormatValueConverter. This elegance might be registered as dateFormat and we can later use it interior view.
Converters.Js
import moment from 'second';
export class DateFormatValueConverter
toView(cost)
return second(price).Format('M/D/YYYY');
In app.Js we are able to just use contemporary date. This could be our view-model.
App.Js
export elegance App
constructor()
this.CurrentDate = new Date();
You already noticed require in custom-elements chapter. The pipe image to apply the converter. We are best the usage of dateFormat seeing that this is how Aurelia is registering DateFormatValueConverter.
App.Html
$ dateFormat
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Question 19. How To Convert Currency In Aurelia?
Answer :
Convert Currency :This is an example of foreign money formatting. You will notice that the concept is similar to in above instance. First we need to put in numeral library from command activate.
C:UsersusernameDesktopaureliaApp>jspm install numeral
Converter will set forex format.
Converters.Js
import numeral from 'numeral';
export magnificence CurrencyFormatValueConverter
toView(cost)
go back numeral(fee).Layout('($0,zero.00)');
View-version will just generate random variety. We will use this as foreign money value and update it each 2nd.
App.Js
export magnificence App
constructor()
this.Replace();
setInterval(() => this.Replace(), one thousand);
replace()
this.MyCurrency = Math.Random() * 1000;
Our view will display the randomly generated quantity transformed as a currency.
App.Html
$ currencyFormat
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Question 20. Explain About Event Delegate?
Answer :
Even delegation is beneficial idea in which event handler is connected to 1 pinnacle level element in preference to multiple elements on the DOM. This will enhance software reminiscence efficiency and need to be used on every occasion viable.
This is simple example of the use of event delegation with Aurelia framework. Our view may have a button with click on.Delegate occasion attached.
App.Html
Once the button is clicked, myFunction() may be referred to as.
App.Js
export magnificence App
myFunction()
console.Log('The function is triggered...');
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Question 21. Explain About Event Trigger?
Answer :
Event Trigger : There are a few cases while you can't use delegation. Some JavaScript activities does not assist delegation, IOS supports it for some elements. To discover which activities lets in delegation you may look for a bubble belongings of any occasion right here. In these cases you may use cause() approach.
The identical functionality from example above may be created with click on.Trigger.
App.Html
app.Js
export elegance App
myFunction()
console.Log('The function is brought about...');
