Computer Knowledge

GUI and Web Frameworks

1,711 Questions

Graphical user interface and web frameworks involve layout management, directives, and application design across platforms like Android and Angular. These concepts are tested in computer science and IT officer competitive exams. Review these questions to understand UI components and coding standards.

Android layout attributesAngular structural directivesVB.Net web methodsJava Swing componentsSiebel application framework

GUI and Web Frameworks Questions

Multiple choice

What is the syntax for creating a template in Angular?

  1. <ng-template #myTemplate>My Template</ng-template>

  2. <template #myTemplate>My Template</template>

  3. <template>My Template</template>

  4. None of the above
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

To create a template in Angular, you use the element. The `#myTemplate` attribute specifies the name of the template, and the content of the element is the HTML template that will be rendered.

Multiple choice

What is the purpose of the *ngFor directive in Angular?

  1. To iterate over an array of data

  2. To create a loop

  3. To display a list of items

  4. All of the above
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

The *ngFor directive in Angular is used to iterate over an array of data and display a list of items. It can be used to create loops and display dynamic content.

Multiple choice

What is the syntax for using the *ngFor directive in Angular?

  1. <ul><li *ngFor="let item of items">{{item}}</li></ul>

  2. <ul><ng-for *ngFor="let item of items">{{item}}</ng-for></ul>

  3. <ul><li *ngFor="item in items">{{item}}</li></ul>

  4. None of the above
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

To use the *ngFor directive in Angular, you specify the array of data that you want to iterate over in the of attribute. The let keyword specifies the name of the variable that will be used to access each item in the array, and the {{item}} expression is used to display the value of each item.

Multiple choice

What is the purpose of the *ngIf directive in Angular?

  1. To conditionally display an element

  2. To show or hide an element

  3. To toggle an element

  4. All of the above
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

The *ngIf directive in Angular is used to conditionally display an element. It can be used to show or hide an element based on a condition, or to toggle an element between two states.

Multiple choice

What is the purpose of the (click) event binding in Angular?

  1. To listen for a click event on an element

  2. To handle a click event on an element

  3. To trigger a function when an element is clicked

  4. All of the above
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

The (click) event binding in Angular is used to listen for a click event on an element. When the element is clicked, the event binding will trigger a function that can be used to handle the event.

Multiple choice

What is the syntax for using the (click) event binding in Angular?

  1. <button (click)="handleClick()">Click Me</button>

  2. <button [click]="handleClick()">Click Me</button>

  3. <button click="handleClick()">Click Me</button>

  4. None of the above
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

To use the (click) event binding in Angular, you specify the function that you want to call when the element is clicked in the (click) attribute. The function must be defined in the component class.

Multiple choice

What is the purpose of the [(ngModel)] directive in Angular?

  1. To bind a form control to a property on a component

  2. To update a property on a component when a form control changes

  3. To validate a form control

  4. All of the above
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

The [(ngModel)] directive in Angular is used to bind a form control to a property on a component. It allows you to update the property on the component when the form control changes, and to validate the form control.

Multiple choice

What is the syntax for using the [(ngModel)] directive in Angular?

  1. <input [(ngModel)]="name">

  2. <input [ngModel]="name">

  3. <input (ngModel)="name">

  4. None of the above
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

To use the [(ngModel)] directive in Angular, you specify the property on the component that you want to bind to in the [(ngModel)] attribute. The property must be defined in the component class.

Multiple choice

What is the purpose of the @Input decorator in Angular?

  1. To allow a component to receive data from its parent component

  2. To pass data from a parent component to a child component

  3. To define a property on a component that can be accessed from outside the component

  4. All of the above
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

The @Input decorator in Angular allows a component to receive data from its parent component. It can be used to pass data from a parent component to a child component, or to define a property on a component that can be accessed from outside the component.

Multiple choice

What is the syntax for using the @Input decorator in Angular?

  1. @Input() name: string;

  2. @Input name: string;

  3. @Input('name') name: string;

  4. None of the above
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

To use the @Input decorator in Angular, you specify the name of the property that you want to receive data for in the @Input() decorator. The property must be defined in the component class.

Multiple choice

What is the purpose of the @Output decorator in Angular?

  1. To allow a component to send data to its parent component

  2. To emit an event when a property on a component changes

  3. To define an event on a component that can be listened to by other components

  4. All of the above
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

The @Output decorator in Angular allows a component to send data to its parent component. It can be used to emit an event when a property on a component changes, or to define an event on a component that can be listened to by other components.

Multiple choice

What is the syntax for using the @Output decorator in Angular?

  1. @Output() name: EventEmitter<string>;

  2. @Output name: EventEmitter<string>;

  3. @Output('name') name: EventEmitter<string>;

  4. None of the above
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

To use the @Output decorator in Angular, you specify the name of the event that you want to emit in the @Output() decorator. The event must be defined in the component class.

Multiple choice

What is the most common way to handle events in React?

  1. Using the addEventListener() method

  2. Using the onClick() event handler

  3. Using the onEvent() method

  4. Using the handleEvent() method
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

The onClick() event handler is a built-in event handler in React that is used to handle click events. It is the most common way to handle events in React.

Multiple choice

Which of the following is not a valid event type in React?

  1. click

  2. change

  3. submit

  4. hover
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

hover is not a valid event type in React. Instead, you can use the onMouseEnter and onMouseLeave event handlers to handle hover events.

Multiple choice

How do you prevent the default behavior of an event in React?

  1. Using the preventDefault() method

  2. Using the stopPropagation() method

  3. Using the cancelBubble property

  4. Using the return false statement
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

The preventDefault() method is used to prevent the default behavior of an event in React. It is the most common way to prevent the default behavior of an event.