Shorthand syntax (: and @) in Vue - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to bind the title attribute using Vue shorthand syntax.

Vue

<button [1]="buttonTitle">Click me</button>

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

A:title

B@title

Cv-bind:title

Dbind:title

Attempts:

3 left

💡 Hint

Common Mistakes

Using '@title' which is for event listeners, not attribute binding.

Writing 'bind:title' which is not valid Vue syntax.

In Vue, the shorthand for binding an attribute is a colon (:). So :title binds the title attribute to the variable.

2fill in blank

medium

Complete the code to listen for a click event using Vue shorthand syntax.

Vue

<button [1]="handleClick">Submit</button>

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

Aon:click

B@click

Cv-on:click

D:click

Attempts:

3 left

💡 Hint

Common Mistakes

Using ':click' which is for binding, not event listening.

Writing 'on:click' which is not valid Vue syntax.

Vue uses '@' as a shorthand for v-on to listen to events. So @click listens for the click event.

3fill in blank

hard

Fix the error in the code by using the correct shorthand syntax for binding the src attribute.

Vue

<img [1]="imageUrl" alt="Image">

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

A@src

Bv-on:src

C:src

Dsrc

Attempts:

3 left

💡 Hint

Common Mistakes

Using '@src' which is invalid for attribute binding.

Leaving 'src' without binding, which won't update dynamically.

To bind the src attribute dynamically, Vue uses :src shorthand for v-bind:src.

4fill in blank

hard

Fill both blanks to bind the href attribute and listen for a mouseover event using Vue shorthand syntax.

Vue

<a [1]="linkUrl" [2]="onHover">Hover here</a>

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

A:href

B@mouseover

C:mouseover

D@href

Attempts:

3 left

💡 Hint

Common Mistakes

Using '@href' which is invalid for attribute binding.

Using ':mouseover' which is invalid for event listening.

Use :href to bind the href attribute and @mouseover to listen for the mouseover event.

5fill in blank

hard

Fill all three blanks to bind the value attribute, listen for an input event, and bind the disabled attribute using Vue shorthand syntax.

Vue

<input [1]="inputValue" [2]="onInput" [3]="isDisabled">

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

A:value

B@input

C:disabled

D@value

Attempts:

3 left

💡 Hint

Common Mistakes

Using '@value' which is invalid for attribute binding.

Using ':input' which is invalid for event listening.

Use :value to bind the value attribute, @input to listen for input events, and :disabled to bind the disabled attribute.

Practice

1. What does the shorthand : represent in Vue templates?

easy

A. It is short for v-bind: to bind data to attributes.

B. It is short for v-on: to listen to events.

C. It is used to define a new component.

D. It is used to comment out code in templates.

Solution

1. Step 1: Understand Vue directive shorthand

   In Vue, v-bind: is used to bind data to HTML attributes.

2. Step 2: Identify shorthand for v-bind:

   The shorthand for v-bind: is :, which simplifies template syntax.

3. Final Answer:

   It is short for v-bind: to bind data to attributes. -> Option A

4. Quick Check:

   : = v-bind: [OK]

Hint: Remember ':' means binding data to attributes [OK]

Common Mistakes:

• Confusing ':' with event listening shorthand '@'
• Thinking ':' defines components
• Assuming ':' is for comments

2. Which of the following is the correct shorthand syntax to listen for a click event on a button in Vue?

easy

A. <button v-bind:click="handleClick">Click</button>

B. <button :click="handleClick">Click</button>

C. <button @click="handleClick">Click</button>

D. <button v-on:bind="handleClick">Click</button>

Solution

1. Step 1: Identify event listening shorthand

   Vue uses v-on: to listen to events, and its shorthand is @.

2. Step 2: Check correct usage for click event

   The correct shorthand for listening to a click event is @click="handleClick".

3. Final Answer:

   <button @click="handleClick">Click</button> -> Option C

4. Quick Check:

   @ = v-on: [OK]

Hint: Use '@' for events like click, not ':' [OK]

Common Mistakes:

• Using ':' instead of '@' for events
• Mixing 'v-bind' with event handlers
• Writing invalid directive names like 'v-on:bind'

3. What will be the rendered output of this Vue template snippet?

<template>
  <input :value="username" @input="updateName" />
</template>

Assuming username is 'Alice' and updateName updates username on input.

medium

A. A syntax error because ':' cannot be used on input elements.

B. An input box showing 'username' text literally.

C. A button labeled 'Alice' that triggers updateName on click.

D. An input box showing 'Alice' that updates username on typing.

Solution

1. Step 1: Understand : and @ usage

   : binds the value attribute to username, so input shows 'Alice'. @input listens for input events to call updateName.

2. Step 2: Predict behavior

   The input box displays 'Alice' initially and updates username as user types.

3. Final Answer:

   An input box showing 'Alice' that updates username on typing. -> Option D

4. Quick Check:

   ':' binds value, '@' listens to input event [OK]

Hint: ':' binds data, '@' listens to events [OK]

Common Mistakes:

• Thinking ':' sets literal text instead of binding
• Confusing '@' with binding syntax
• Assuming syntax error on input element

4. Identify the error in this Vue template snippet:

<button :click="submitForm">Submit</button>

medium

A. Using ':' instead of '@' for event listening.

B. Missing quotes around 'submitForm'.

C. Button tag cannot have any directives.

D. Should use 'v-bind:click' instead of ':click'.

Solution

1. Step 1: Check directive usage for events

   Events require v-on: or shorthand @, not v-bind: or :.

2. Step 2: Identify incorrect shorthand

   The snippet uses :click, which is wrong; it should be @click.

3. Final Answer:

   Using ':' instead of '@' for event listening. -> Option A

4. Quick Check:

   Use '@' for events, not ':' [OK]

Hint: Use '@' for events, ':' only for binding [OK]

Common Mistakes:

• Confusing ':' and '@' usage
• Thinking 'v-bind' works for events
• Assuming quotes missing cause error here

5. You want to bind a dynamic CSS class and listen for a custom event save on a component. Which is the correct Vue shorthand syntax?

hard

A. <MyComponent v-bind:save="handleSave" v-on:class="dynamicClass" />

B. <MyComponent :class="dynamicClass" @save="handleSave" />

C. <MyComponent @class="dynamicClass" :save="handleSave" />

D. <MyComponent :class="handleSave" @save="dynamicClass" />

Solution

1. Step 1: Bind dynamic class attribute

   Use : shorthand for v-bind: to bind class dynamically.

2. Step 2: Listen for custom event

   Use @ shorthand for v-on: to listen for save event.

3. Step 3: Verify correct pairing

   <MyComponent :class="dynamicClass" @save="handleSave" /> correctly binds class and listens to save event with proper shorthand.

4. Final Answer:

   <MyComponent :class="dynamicClass" @save="handleSave" /> -> Option B

5. Quick Check:

   ':' for binding, '@' for events [OK]

Hint: Bind with ':', listen with '@' for clean syntax [OK]

Common Mistakes:

• Swapping binding and event shorthand
• Using '@' for binding attributes
• Mixing handler and data names incorrectly