v-on directive for events in Vue - Cheat Sheet & Quick Revision

Recall & Review

beginner

What is the purpose of the v-on directive in Vue?

The v-on directive listens for DOM events and runs specified JavaScript code or methods when those events happen.

beginner

How do you use v-on to listen for a click event on a button?

You write <button v-on:click="methodName">Click</button>. When the button is clicked, the method methodName runs.

beginner

What is the shorthand syntax for v-on:click?

You can use @click instead of v-on:click to make the code shorter and cleaner.

intermediate

How can you pass an event object to a method using v-on?

You can pass the event object by adding $event as an argument like v-on:click="methodName($event)". This lets the method access details about the event.

intermediate

What are event modifiers in Vue's v-on directive?

Event modifiers are special suffixes like .stop or .prevent added to v-on to change event behavior, such as stopping propagation or preventing default actions.

Which of these is the correct way to listen for a click event using v-on?

A <button v-click="handleClick">Click me</button>

B <button v-on-click="handleClick">Click me</button>

C <button on-click="handleClick">Click me</button>

D <button v-on:click="handleClick">Click me</button>

The correct Vue syntax uses v-on:click or its shorthand @click.

What does the shorthand @click mean in Vue?

A It is a custom event name

B It is a shortcut for <code>v-on:click</code>

C It is a shortcut for <code>v-bind:click</code>

D It disables the click event

@click is the shorthand for v-on:click to listen for click events.

How do you prevent the default action of an event using v-on?

A Add the modifier <code>.prevent</code> like <code>v-on:submit.prevent</code>

B Use <code>event.preventDefault()</code> inside the method only

C Add <code>v-on:submit.stop</code>

D Use <code>v-on:submit.preventDefault</code>

Vue provides the .prevent modifier to automatically call event.preventDefault().

What does the .stop modifier do when added to v-on?

A Delays the event handler execution

B Prevents the default browser action

C Stops the event from propagating to parent elements

D Stops the event listener from running

The .stop modifier calls event.stopPropagation() to stop bubbling.

How can you listen for a keyboard event like pressing Enter using v-on?

A <input v-on:keyup.enter="submitForm">

B <input v-on:enter="submitForm">

C <input v-on:keyup="submitForm">

D <input v-on:keydown.enterKey="submitForm">

Vue supports key modifiers like .enter to listen for specific keys.

Explain how to use the v-on directive to handle a button click event in Vue.

Think about how you connect a click on a button to a method in your Vue component.

Describe what event modifiers are in Vue and give two examples with their effects.

Modifiers change how events behave, like stopping bubbling or preventing default browser actions.