Vue.js Event Handling and Refs Quiz

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Question 1/15

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

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Question 2/15

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

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Question 3/15

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

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Question 4/15

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

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Question 5/15

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

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Question 6/15

How would you bind a method to the focus event of an input in Vue.js?
<input v-on:focus="onFocus">

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Question 7/15

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

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Question 8/15

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

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Question 9/15

How can you prevent the default action triggered by an event in Vue.js?
<form v-on:submit.prevent="submitForm">

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Question 10/15

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

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Question 11/15

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

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Question 12/15

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

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Question 13/15

How do you bind an event in Vue.js to a button click?
<button v-on:click="submitForm">Submit</button>

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Question 14/15

How do you listen for the input event on an input field in Vue.js?
<input type="text" v-on:input="onInput" />

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Question 15/15

What does the .once modifier do when used in Vue.js event handling?
<button v-on:click.once="handleClick">Click Me</button>

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Your Answers

Question 1/15
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What is the result of updating <code>this.$refs</code> within a method after a DOM change has occurred?

Available answers

In Vue.js, changes to the DOM do not automatically reflect in this.$refs within the same method call. The changes are acknowledged after the component's next render cycle.
Question 2/15
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When using the ref attribute, when is the DOM reference available to be accessed via this.$refs?

Available answers

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 3/15
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How would you bind a method to a double-click event in Vue.js?

Available answers

The 'dblclick' event can be handled in Vue.js using v-on:dblclick="handleDoubleClick" or the shorthand @dblclick="handleDoubleClick".
Question 4/15
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Why should the 'mounted' lifecycle hook be used instead of 'created' to manipulate the DOM?

Available answers

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 5/15
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Can you use .stop and .prevent with the same event handler in Vue.js?

Available answers

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 6/15
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How would you bind a method to the focus event of an input in Vue.js?
<input v-on:focus="onFocus">

Available answers

To bind a method to the focus event in Vue.js, use v-on:focus="onFocus" or the shorthand @focus="onFocus".
Question 7/15
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What is the main difference between the 'click' and 'dblclick' event modifiers?

Available answers

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

Available answers

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 9/15
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How can you prevent the default action triggered by an event in Vue.js?
<form v-on:submit.prevent="submitForm">

Available answers

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 10/15
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Which event handling modifier in Vue.js automatically stops the event from propagating and calling preventDefault?

Available answers

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 11/15
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What is the correct format to set a custom event handler in a child component using the v-on directive?

Available answers

To listen to a custom event emitted from a child component, use v-on:childEvent="method" or the shorthand @childEvent="method".
Question 12/15
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What is the correct way to pass an argument to an event handler in Vue.js?

Available answers

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 13/15
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How do you bind an event in Vue.js to a button click?
<button v-on:click="submitForm">Submit</button>

Available answers

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 14/15
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How do you listen for the input event on an input field in Vue.js?
<input type="text" v-on:input="onInput" />

Available answers

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 15/15
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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

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