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Vue.js Event Handling and Refs Quiz

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Question 1/15

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

Select your answer

this.$forceUpdate

this.$refresh

this.$updateDOM

this.$nextTick

Question 2/15

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:active="onFocus"

@hover="onFocus"

v-on:blur="onFocus"

v-on:focus="onFocus"

Question 3/15

Can you access refs directly in the template of a Vue.js component?

Select your answer

No, refs are accessible only in JavaScript methods.

No, because refs are designed for DOM manipulation only.

Yes, refs are always available in templates.

Yes, but only if they are data properties as well.

Question 4/15

Which event handling modifier in Vue.js automatically stops the event from propagating and calling preventDefault?

Select your answer

There is no single modifier for both actions together.

.prevent

.stopImmediate

.stop

Question 5/15

When using the ref attribute, when is the DOM reference available to be accessed via this.$refs?

Select your answer

After the component is destroyed.

After the component is updated.

After the component is mounted.

After the component is created.

Question 6/15

Can you use .stop and .prevent with the same event handler in Vue.js?

Select your answer

Yes, use them together like @click.stop.prevent.

No, you have to choose either .stop or .prevent for each event handler.

Apply at the instance level, not on elements.

Use only in separate event handlers with different methods.

Question 7/15

What is the main difference between the 'click' and 'dblclick' event modifiers?

Select your answer

'dblclick' resets after each click event.

'dblclick' is only supported on buttons.

'click' is single-click; 'dblclick' requires two rapid clicks

'click' listens to all mouse events; 'dblclick' only listens to left button.

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 JavaScript 'addEventListener'.

Using the 'bind' method directly.

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

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

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:input="onInput".

Using v-on:change="onInput".

Using v-on:keypress="onInput".

Using @output="onInput".

Question 10/15

How can you prevent the default action triggered by an event in Vue.js?

<form v-on:submit.prevent="submitForm">

Select your answer

Handling it in the method using event.preventDefault()

Using the JavaScript.prevent() method.

Adding .stop after the event name.

Adding .prevent after the event name.

Question 11/15

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.

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

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

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

Question 12/15

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

Select your answer

Question 13/15

Which lifecycle hook is best suited for initializing event listeners?

Select your answer

beforeCreate

mounted

created

updated

Question 14/15

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:emitChildEvent="method"

v-on:child.event="method"

@emitEvent.child="method"

v-on:childEvent="method"

Question 15/15

What is the ref attribute used for in Vue.js components?

Select your answer

To bind a data property.

To specify a lifecycle hook.

To create a reference to a DOM element or child component.

To import another component.

Your Results

You did not answer any questions correctly.

Your Answers

Question 1/15

😊 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.$refresh

this.$updateDOM

this.$nextTick

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 2/15

😊 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:active="onFocus"</code>

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

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

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

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

Question 3/15

😊 Your answer was correct 🙁 Your answer was incorrect

Can you access refs directly in the template of a Vue.js component?

Available answers

No, refs are accessible only in JavaScript methods.

No, because refs are designed for DOM manipulation only.

Yes, refs are always available in templates.

Yes, but only if they are data properties as well.

Refs are not accessible directly in the template because they are meant for JavaScript code usage through this.$refs.

Question 4/15

😊 Your answer was correct 🙁 Your answer was incorrect

Which event handling modifier in Vue.js automatically stops the event from propagating and calling preventDefault?

Available answers

There is no single modifier for both actions together.

.prevent

.stopImmediate

.stop

Vue.js does not have a single modifier that both stops event propagation and prevents default. The .stop modifier does propagation stopping and .prevent prevents default, but they must be used together to achieve both actions.

Question 5/15

😊 Your answer was correct 🙁 Your answer was incorrect

When using the ref attribute, when is the DOM reference available to be accessed via this.$refs?

Available answers

After the component is destroyed.

After the component is updated.

After the component is mounted.

After the component is created.

In Vue.js, DOM references via this.$refs are available after the component has been mounted to the DOM, making the 'mounted' hook an appropriate place to access them.

Question 6/15

😊 Your answer was correct 🙁 Your answer was incorrect

Can you use .stop and .prevent with the same event handler in Vue.js?

Available answers

Yes, use them together like <code>@click.stop.prevent</code>.

No, you have to choose either .stop or .prevent for each event handler.

Apply at the instance level, not on elements.

Use only in separate event handlers with different methods.

In Vue.js, you can chain event modifiers. For example, you can write @click.stop.prevent to both stop the event from propagating and prevent its default action.

Question 7/15

😊 Your answer was correct 🙁 Your answer was incorrect

What is the main difference between the 'click' and 'dblclick' event modifiers?

Available answers

'dblclick' resets after each click event.

'dblclick' is only supported on buttons.

'click' is single-click; 'dblclick' requires two rapid clicks

'click' listens to all mouse events; 'dblclick' only listens to left button.

The key difference is that 'click' fires on a single click, whereas 'dblclick' requires two clicks in quick succession. They represent different user interactions.

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 JavaScript 'addEventListener'.

Using the 'bind' method directly.

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

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

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:input="onInput".

Using v-on:change="onInput".

Using v-on:keypress="onInput".

Using @output="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

How can you prevent the default action triggered by an event in Vue.js?

<form v-on:submit.prevent="submitForm">

Available answers

Handling it in the method using event.preventDefault()

Using the JavaScript.prevent() method.

Adding .stop after the event name.

Adding .prevent after the event name.

Vue.js provides modifiers like .prevent to easily prevent default actions for events. For a form submission, you can use v-on:submit.prevent="submitForm" to stop the default form submission.

Question 11/15

😊 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.

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

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

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 12/15

😊 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">.

Question 13/15

😊 Your answer was correct 🙁 Your answer was incorrect

Which lifecycle hook is best suited for initializing event listeners?

Available answers

beforeCreate

mounted

created

updated

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 14/15

😊 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:emitChildEvent="method"

v-on:child.event="method"

@emitEvent.child="method"

v-on:childEvent="method"

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

Question 15/15

😊 Your answer was correct 🙁 Your answer was incorrect

What is the ref attribute used for in Vue.js components?

Available answers

To bind a data property.

To specify a lifecycle hook.

To create a reference to a DOM element or child component.

To import another component.

The 'ref' attribute is used in Vue.js to create a reference to a DOM element or a child component. This allows direct interaction with the DOM or component instance using this.$refs.