Why data binding matters in Angular - Test Your Understanding

Practice - 5 Tasks

1fill in blank

easy

Complete the code to bind the input value to the component property.

Angular

<input type="text" [(ngModel)]="[1]">

Drag options to blanks, or click blank then click option'

AinputValue

BuserInput

CuserName

Dname

Attempts:

3 left

💡 Hint

Common Mistakes

Using a property name that does not exist in the component.

Forgetting to use the two-way binding syntax [(ngModel)].

The [(ngModel)] directive binds the input field to the userName property in the component, enabling two-way data binding.

2fill in blank

medium

Complete the code to display the bound property value in the template.

Angular

<p>Hello, {{ [1] }}!</p>

Drag options to blanks, or click blank then click option'

AuserName

BuserInput

CinputValue

Dname

Attempts:

3 left

💡 Hint

Common Mistakes

Using a different property name than the one bound to the input.

Forgetting to use interpolation syntax.

The interpolation syntax {{ userName }} displays the current value of the userName property from the component.

3fill in blank

hard

Fix the error in the code to correctly bind the input and display the value.

Angular

<input type="text" [ngModel]="[1]">
<p>{{ userName }}</p>

Drag options to blanks, or click blank then click option'

Aname

BuserInput

CinputValue

DuserName

Attempts:

3 left

💡 Hint

Common Mistakes

Using one-way binding syntax instead of two-way binding.

Mismatching property names between input and display.

Using [ngModel] alone creates one-way binding from the component to the input. To enable two-way binding, use [(ngModel)] instead. Here, the property is userName.

4fill in blank

hard

Fill both blanks to create a two-way data binding and display the updated value.

Angular

<input type="text" [1]="userName">
<p>{{ [2] }}</p>

Drag options to blanks, or click blank then click option'

A[(ngModel)]

BuserInput

CuserName

D[ngModel]

Attempts:

3 left

💡 Hint

Common Mistakes

Using one-way binding syntax instead of two-way binding.

Displaying a different property than the one bound to the input.

The [(ngModel)] directive binds the input to the userName property, and interpolation displays its current value.

5fill in blank

hard

Fill all three blanks to bind the input, update the property, and display the value.

Angular

<input type="text" [1]="[2]">
<p>{{ [3] }}</p>

Drag options to blanks, or click blank then click option'

A[ngModel]

BuserName

D[(ngModel)]

Attempts:

3 left

💡 Hint

Common Mistakes

Mixing one-way and two-way binding syntax.

Using different property names in binding and display.

Use [(ngModel)] for two-way binding on the input with the userName property, and display it with interpolation.