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Vue.js Event Handling and Refs Quiz

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Question 1/15

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

The 'mounted' hook initializes the data flow.

The 'created' hook does not execute Vue code.

Question 2/15

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

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

Select your answer

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

Using JavaScript 'addEventListener'.

Using the 'bind' method directly.

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

Question 3/15

Which lifecycle hook is best suited for initializing event listeners?

Select your answer

updated

beforeCreate

created

mounted

Question 4/15

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"

@emitEvent.child="method"

v-on:child.event="method"

v-on:emitChildEvent="method"

Question 5/15

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 6/15

What does the .stop modifier do in Vue.js event handling?

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

Select your answer

Stops data propagation in the Vue app.

Prevents the event from propagating up the DOM tree.

Stops the function in the event handler.

Stops the template from re-rendering.

Question 7/15

How would you bind a method to a double-click event in Vue.js?

Select your answer

v-on:double-click="handleDoubleClick"

v-on:dblclick="handleDoubleClick"

@dbclick="handleDoubleClick"

v-on:dbclick="handleDoubleClick"

Question 8/15

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

Select your answer

After the component is updated.

After the component is created.

After the component is mounted.

After the component is destroyed.

Question 9/15

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

Select your answer

@click:arg="method"

@click="method:arg"

@click="method(arg)"

@click="method()"

Question 10/15

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.

Question 11/15

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 @output="onInput".

Using v-on:keypress="onInput".

Question 12/15

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

Select your answer

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

Handles events only from the parent component.

Triggers all click events on other nodes once.

Binds the event to a single DOM node.

Triggers the event listener only once.

Question 14/15

What is the result of updating this.$refs within a method after a DOM change has occurred?

Select your answer

The $refs cause a re-render immediately.

The $refs do not track DOM changes.

The $refs are automatically updated.

The $refs reflect changes after the method exits, during the next render.

Question 15/15

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.

.stopImmediate

.stop

.prevent

Your Results

You did not answer any questions correctly.

Your Answers

Question 1/15

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

The 'mounted' hook initializes the data flow.

The 'created' hook does not execute Vue code.

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 2/15

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

Using JavaScript 'addEventListener'.

Using the 'bind' method directly.

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 3/15

😊 Your answer was correct 🙁 Your answer was incorrect

Which lifecycle hook is best suited for initializing event listeners?

Available answers

updated

beforeCreate

created

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 4/15

😊 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"

@emitEvent.child="method"

v-on:child.event="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 5/15

😊 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 6/15

😊 Your answer was correct 🙁 Your answer was incorrect

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

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

Available answers

Stops data propagation in the Vue app.

Prevents the event from propagating up the DOM tree.

Stops the function in the event handler.

Stops the template from re-rendering.

The .stop modifier is used to call event.stopPropagation() on the triggered event, preventing it from bubbling up the DOM tree.

Question 7/15

😊 Your answer was correct 🙁 Your answer was incorrect

How would you bind a method to a double-click event in Vue.js?

Available answers

<code>v-on:double-click="handleDoubleClick"</code>

<code>v-on:dblclick="handleDoubleClick"</code>

<code>@dbclick="handleDoubleClick"</code>

<code>v-on:dbclick="handleDoubleClick"</code>

The 'dblclick' event can be handled in Vue.js using v-on:dblclick="handleDoubleClick" or the shorthand @dblclick="handleDoubleClick".

Question 8/15

😊 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 updated.

After the component is created.

After the component is mounted.

After the component is destroyed.

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 9/15

😊 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:arg="method"</code>

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

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

<code>@click="method()"</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 10/15

😊 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.

Question 11/15

😊 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 @output="onInput".

Using v-on:keypress="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 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

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

Handles events only from the parent component.

Triggers all click events on other nodes once.

Binds the event to a single DOM node.

Triggers the event listener only once.

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

What is the result of updating <code>this.$refs</code> within a method after a DOM change has occurred?

Available answers

The $refs cause a re-render immediately.

The $refs do not track DOM changes.

The $refs are automatically updated.

The $refs reflect changes after the method exits, during the next render.

In Vue.js, changes to the DOM do not automatically reflect in this.$refs within the same method call. The changes are acknowledged after the component's next render cycle.

Question 15/15

😊 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.

.stopImmediate

.stop

.prevent

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.