v-model with text inputs in Vue - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to bind the input value using v-model.

Vue

<template>
  <input type="text" [1] />
</template>

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

Av-model="name"

B:value="name"

Cv-bind:value="name"

Dv-on:input="name = $event.target.value"

Attempts:

3 left

💡 Hint

Common Mistakes

Using v-bind:value only binds the value but does not update the variable.

Using v-on:input requires manual event handling.

The v-model directive binds the input's value and updates the variable automatically.

2fill in blank

medium

Complete the code to declare the reactive variable for the input.

Vue

<script setup>
import { ref } from 'vue'
const name = [1]('')
</script>

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

Awatch

Breactive

Ccomputed

Dref

Attempts:

3 left

💡 Hint

Common Mistakes

Using reactive is for objects, not simple strings.

Computed is for derived values, not initial reactive state.

The ref function creates a reactive variable for simple values like strings.

3fill in blank

hard

Fix the error in the input binding to correctly update the variable.

Vue

<template>
  <input type="text" v-model=[1] />
</template>

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

A"name"

Bref('name')

Cname

Dname.value

Attempts:

3 left

💡 Hint

Common Mistakes

Adding quotes makes it a string literal, not a variable.

Using .value is only for script, not template.

In Vue templates, use the variable name directly without quotes or .value when using v-model.

4fill in blank

hard

Fill both blanks to create a two-way binding with a placeholder.

Vue

<template>
  <input type="text" [1] [2] />
</template>

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

Av-model="username"

Bv-bind:placeholder="username"

Cplaceholder="Enter name"

Dv-bind:placeholder="'Enter name'"

Attempts:

3 left

💡 Hint

Common Mistakes

Using placeholder without quotes inside v-bind causes errors.

Not using v-model means input won't update the variable.

Use v-model to bind the input value and v-bind:placeholder with a string to set the placeholder dynamically.

5fill in blank

hard

Fill all three blanks to create a reactive input with initial value and display it.

Vue

<template>
  <input type="text" [1] />
  <p>Your name is: [2]</p>
</template>

<script setup>
import { ref } from 'vue'
const [3] = ref('Alice')
</script>

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

Av-model="name"

Bname

Dusername

Attempts:

3 left

💡 Hint

Common Mistakes

Using different variable names causes errors.

Not initializing the ref causes empty input.

Bind the input with v-model="name", display the variable name, and declare name as a ref with initial value.

Practice

1. What does v-model do when used on a text input in Vue?

easy

A. It listens for clicks on the input but does not update the value.

B. It only sets the initial value of the input but does not update data.

C. It creates a two-way binding between the input and a data property.

D. It disables the input field from user interaction.

Solution

1. Step 1: Understand v-model purpose

   v-model connects the input's value with a Vue data property, syncing changes both ways.

2. Step 2: Compare options with v-model behavior

   Only It creates a two-way binding between the input and a data property. describes this two-way binding correctly; others describe incorrect or unrelated behaviors.

3. Final Answer:

   It creates a two-way binding between the input and a data property. -> Option C

4. Quick Check:

   v-model = two-way binding [OK]

Hint: Remember: v-model syncs input and data both ways [OK]

Common Mistakes:

• Thinking v-model only sets initial value
• Confusing v-model with event listeners
• Assuming v-model disables input

2. Which of the following is the correct syntax to bind a text input to a data property username using v-model?

easy

A.

B.

C.

D.

Solution

1. Step 1: Identify correct v-model syntax

   The correct syntax uses v-model="username" on the input element.

2. Step 2: Check input type and binding

   <input v-model="username" type="text" /> uses correct syntax and input type text. <input :v-model="username" type="text" /> incorrectly uses colon binding. <input v-bind:model="username" type="text" /> misuses v-bind. <input v-model='username' type='checkbox' /> uses checkbox type, not text.

3. Final Answer:

   <input v-model="username" type="text" /> -> Option A

4. Quick Check:

   Correct v-model syntax = [OK]

Hint: Use v-model="property" without colon for text inputs [OK]

Common Mistakes:

• Adding colon before v-model
• Using v-bind:model instead of v-model
• Mismatching input type with v-model usage

3. Given this Vue component code:

const app = Vue.createApp({
  data() {
    return { message: 'Hello' };
  }
});

// Template:
// <input v-model="message" type="text" />
// <p>{{ message }}</p>

What will be displayed in the paragraph after the user types "Hi Vue" in the input?

medium

A. Hello

B. {{ message }}

C. An empty string

D. Hi Vue

Solution

1. Step 1: Understand v-model effect on data

   Typing in the input updates the message data property immediately due to two-way binding.

2. Step 2: Check paragraph binding

   The paragraph displays {{ message }}, so it shows the updated value typed by the user.

3. Final Answer:

   Hi Vue -> Option D

4. Quick Check:

   Input changes update message = displayed text [OK]

Hint: v-model updates data instantly, reflected in template [OK]

Common Mistakes:

• Thinking paragraph shows initial value only
• Confusing mustache syntax as literal text
• Assuming input does not update data

4. What is wrong with this Vue template snippet?

<input v-model="userName" type="text" />
<p>User: {{ username }}</p>

Why does the paragraph not update when typing in the input?

medium

A. v-model cannot be used on text inputs.

B. The data property is named differently from the template binding.

C. The input type should be "password" for v-model to work.

D. Must use v-bind instead of v-model for inputs.

Solution

1. Step 1: Compare data property and template usage

   The input uses v-model="userName" but paragraph uses {{ username }} with different casing.

2. Step 2: Understand Vue is case-sensitive

   Vue treats userName and username as different properties, so paragraph does not update.

3. Final Answer:

   The data property is named differently from the template binding. -> Option B

4. Quick Check:

   Case mismatch breaks binding = The data property is named differently from the template binding. [OK]

Hint: Check exact spelling and casing of data and template names [OK]

Common Mistakes:

• Assuming v-model doesn't work on text inputs
• Thinking input type affects v-model binding
• Confusing v-bind and v-model usage

5. You want to create a form with two text inputs bound to firstName and lastName using v-model. You also want to display the full name live as the user types. Which Vue template snippet correctly achieves this?

hard

A.

Full Name: {{ firstName + ' ' + lastName }}

B.

Full Name: {{ firstName & lastName }}

C.

Full Name: {{ firstName.concat(lastName) }}

D.

Full Name: {{ firstName + lastName }}

Solution

1. Step 1: Check how full name is constructed

   <input v-model="firstName" type="text" /> <input v-model="lastName" type="text" /> <p>Full Name: {{ firstName + ' ' + lastName }}</p> concatenates firstName and lastName with a space, showing a proper full name.

2. Step 2: Analyze other options for correctness

   <input v-model="firstName" type="text" /> <input v-model="lastName" type="text" /> <p>Full Name: {{ firstName & lastName }}</p> uses & which is invalid in JS expressions. <input v-model="firstName" type="text" /> <input v-model="lastName" type="text" /> <p>Full Name: {{ firstName.concat(lastName) }}</p> uses concat without space, so names join without space. <input v-model="firstName" type="text" /> <input v-model="lastName" type="text" /> <p>Full Name: {{ firstName + lastName }}</p> concatenates without space, so names run together.

3. Final Answer:

   <input v-model="firstName" type="text" /> <input v-model="lastName" type="text" /> <p>Full Name: {{ firstName + ' ' + lastName }}</p> -> Option A

4. Quick Check:

   Use + with space to join strings in template [OK]

Hint: Use + ' ' + to join strings with space in mustache [OK]

Common Mistakes:

• Using & instead of + for string join
• Forgetting space between names
• Using concat without space