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Vue.js Event Handling and Refs Quiz

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Question 1/15

What is the correct format to set a custom event handler in a child component using the v-on directive?

Select your answer

v-on:childEvent="method"

v-on:child.event="method"

@emitEvent.child="method"

v-on:emitChildEvent="method"

Question 2/15

Which lifecycle hook is best suited for initializing event listeners?

Select your answer

created

updated

beforeCreate

mounted

Question 3/15

To listen to a native DOM event within a Vue component, the following special modifier is used:

Select your answer

Use the nativeEvents keyword in the component definition.

The native modifier is no longer recommended as of Vue 2.6.

You should always use the .native modifier regardless of setup.

No special treatment for native DOM events; use as they are.

Question 4/15

What method is called to manually update a component in Vue.js after direct DOM manipulation?

Select your answer

this.$forceUpdate

this.$nextTick

this.$refresh

this.$updateDOM

Question 5/15

What is the correct way to pass an argument to an event handler in Vue.js?

Select your answer

@click="method()"

@click="method:arg"

@click:arg="method"

@click="method(arg)"

Question 6/15

How do you stop the immediate propagation of an event in Vue.js?

Select your answer

There is no .stopImmediate modifier in Vue.js.

Using .preventPropagation

Using .stopPropagation

Using .stopModifier

Question 7/15

Which directive in Vue.js is used to bind an event handler?

Select your answer

v-bind

v-on

v-model

v-show

Question 8/15

How do you bind an event in Vue.js to a button click?

<button v-on:click="submitForm">Submit</button>

Select your answer

Using the 'bind' method directly.

Using JavaScript 'addEventListener'.

Using v-bind:click="submitForm" notation.

Using v-on:click="submitForm" or @click="submitForm" shorthand.

Question 9/15

How do you listen for the input event on an input field in Vue.js?

<input type="text" v-on:input="onInput" />

Select your answer

Using v-on:change="onInput".

Using @output="onInput".

Using v-on:keypress="onInput".

Using v-on:input="onInput".

Question 10/15

Why should the 'mounted' lifecycle hook be used instead of 'created' to manipulate the DOM?

Select your answer

The 'mounted' hook guarantees the component has been rendered and added to the DOM.

The 'created' hook does not execute Vue code.

The 'mounted' hook is triggered after data properties are defined.

The 'mounted' hook initializes the data flow.

Question 11/15

How would you add a click event handler in Vue.js using the template syntax?

Select your answer

@click="handleClick"

*click="handleClick"

#handleClick

::handleClick

Question 12/15

How do you ensure a method executes only once in response to an event in Vue.js?

Select your answer

Add a .once modifier to v-on directive.

Initialize a static variable and return if marked.

Use setTimeout inside the method to disable it after the first call.

Create a reactive property that tracks executions.

Question 13/15

What does the .once modifier do when used in Vue.js event handling?

<button v-on:click.once="handleClick">Click Me</button>

Select your answer

Triggers the event listener only once.

Triggers all click events on other nodes once.

Binds the event to a single DOM node.

Handles events only from the parent component.

Question 14/15

How would you bind a method to the focus event of an input in Vue.js?

<input v-on:focus="onFocus">

Select your answer

v-on:focus="onFocus"

v-on:active="onFocus"

@hover="onFocus"

v-on:blur="onFocus"

Question 15/15

What is the shorthand for the v-on directive in Vue.js?

Select your answer

Your Results

You did not answer any questions correctly.

Your Answers

Question 1/15

😊 Your answer was correct 🙁 Your answer was incorrect

What is the correct format to set a custom event handler in a child component using the v-on directive?

Available answers

v-on:childEvent="method"

v-on:child.event="method"

@emitEvent.child="method"

v-on:emitChildEvent="method"

To listen to a custom event emitted from a child component, use v-on:childEvent="method" or the shorthand @childEvent="method".

Question 2/15

😊 Your answer was correct 🙁 Your answer was incorrect

Which lifecycle hook is best suited for initializing event listeners?

Available answers

created

updated

beforeCreate

mounted

The 'mounted' lifecycle hook is best for initializing event listeners because it is called after the component is added to the DOM. This ensures all the components' elements are available.

Question 3/15

😊 Your answer was correct 🙁 Your answer was incorrect

To listen to a native DOM event within a Vue component, the following special modifier is used:

Available answers

Use the nativeEvents keyword in the component definition.

The native modifier is no longer recommended as of Vue 2.6.

You should always use the .native modifier regardless of setup.

No special treatment for native DOM events; use as they are.

In Vue.js 2.6 and later, using .native for listening to native DOM events in deeply referred components is discouraged; instead, proper event listener patterns are advised for component-library interaction.

Question 4/15

😊 Your answer was correct 🙁 Your answer was incorrect

What method is called to manually update a component in Vue.js after direct DOM manipulation?

Available answers

this.$forceUpdate

this.$nextTick

this.$refresh

this.$updateDOM

The this.$nextTick method in Vue.js is called to delay code execution until after the next DOM update cycle, ensuring reactivity after direct DOM manipulations.

Question 5/15

😊 Your answer was correct 🙁 Your answer was incorrect

What is the correct way to pass an argument to an event handler in Vue.js?

Available answers

<code>@click="method()"</code>

<code>@click="method:arg"</code>

<code>@click:arg="method"</code>

<code>@click="method(arg)"</code>

To pass an argument to an event handler in Vue.js, you include the argument within the method call in the template, like @click="method(arg)".

Question 6/15

😊 Your answer was correct 🙁 Your answer was incorrect

How do you stop the immediate propagation of an event in Vue.js?

Available answers

There is no .stopImmediate modifier in Vue.js.

Using .preventPropagation

Using .stopPropagation

Using .stopModifier

Vue.js provides a .stop modifier to prevent event propagation but does not natively support immediate propagation stopping like .stopImmediate. You must handle this behavior within a method using native JavaScript code.

Question 7/15

😊 Your answer was correct 🙁 Your answer was incorrect

Which directive in Vue.js is used to bind an event handler?

Available answers

v-bind

v-on

v-model

v-show

The v-on directive in Vue.js is used to bind an event handler to an element.

Question 8/15

😊 Your answer was correct 🙁 Your answer was incorrect

How do you bind an event in Vue.js to a button click?

<button v-on:click="submitForm">Submit</button>

Available answers

Using the 'bind' method directly.

Using JavaScript 'addEventListener'.

Using v-bind:click="submitForm" notation.

Using v-on:click="submitForm" or @click="submitForm" shorthand.

In Vue.js, event handlers can be attached using the directive v-on or its shorthand @. For example, in the code snippet <button v-on:click="submitForm">Submit</button>, when the button is clicked, it calls the method 'submitForm'.

Question 9/15

😊 Your answer was correct 🙁 Your answer was incorrect

How do you listen for the input event on an input field in Vue.js?

<input type="text" v-on:input="onInput" />

Available answers

Using v-on:change="onInput".

Using @output="onInput".

Using v-on:keypress="onInput".

Using v-on:input="onInput".

In Vue.js, the directive v-on:input="onInput" attaches an event listener for the 'input' event, which triggers the 'onInput' method whenever the input's value changes.

Question 10/15

😊 Your answer was correct 🙁 Your answer was incorrect

Why should the 'mounted' lifecycle hook be used instead of 'created' to manipulate the DOM?

Available answers

The 'mounted' hook guarantees the component has been rendered and added to the DOM.

The 'created' hook does not execute Vue code.

The 'mounted' hook is triggered after data properties are defined.

The 'mounted' hook initializes the data flow.

The 'mounted' lifecycle hook is appropriate for DOM manipulations because it runs after the component is rendered and attached to the DOM, unlike 'created', which happens before rendering.

Question 11/15

😊 Your answer was correct 🙁 Your answer was incorrect

How would you add a click event handler in Vue.js using the template syntax?

Available answers

<code>@click="handleClick"</code>

<code>*click="handleClick"</code>

<code>#handleClick</code>

<code>::handleClick</code>

In Vue.js, you can add an event handler for a click event by using the @click syntax. This is shorthand for v-on:click.

Question 12/15

😊 Your answer was correct 🙁 Your answer was incorrect

How do you ensure a method executes only once in response to an event in Vue.js?

Available answers

Add a .once modifier to v-on directive.

Initialize a static variable and return if marked.

Use setTimeout inside the method to disable it after the first call.

Create a reactive property that tracks executions.

The .once modifier in Vue.js ensures the event handler attached to v-on will execute only once and then automatically be removed from the element.

Question 13/15

😊 Your answer was correct 🙁 Your answer was incorrect

What does the <code>.once</code> modifier do when used in Vue.js event handling?

<button v-on:click.once="handleClick">Click Me</button>

Available answers

Triggers the event listener only once.

Triggers all click events on other nodes once.

Binds the event to a single DOM node.

Handles events only from the parent component.

The .once modifier ensures that the event handler will be triggered only once, after which it will be removed.

Question 14/15

😊 Your answer was correct 🙁 Your answer was incorrect

How would you bind a method to the focus event of an input in Vue.js?

<input v-on:focus="onFocus">

Available answers

<code>v-on:focus="onFocus"</code>

<code>v-on:active="onFocus"</code>

<code>@hover="onFocus"</code>

<code>v-on:blur="onFocus"</code>

To bind a method to the focus event in Vue.js, use v-on:focus="onFocus" or the shorthand @focus="onFocus".

Question 15/15

😊 Your answer was correct 🙁 Your answer was incorrect

What is the shorthand for the v-on directive in Vue.js?

Available answers

In Vue.js, the shorthand for the v-on directive is '@'. For example, <button v-on:click="submitForm"> can be written as <button @click="submitForm">.