Vue.js Forms and Validation Quiz

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Question 1/10

What is the purpose of the lazy modifier in Vue's v-model?

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Question 2/10

Given the following component methods, which one would be best for validating a form on submit in Vue.js?
methods: {
  validateForm() {
    // validation code
  },
  onSubmit() {
    this.validateForm();
    // submit form
  }
}

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Question 3/10

How do you prevent a form submission in Vue.js if validation fails?
methods: {
  onSubmit(event) {
    if (!this.isValid) {
      event.preventDefault();
    }
  }
}

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Question 4/10

When using v-model on a checkbox, what does the value bind to when it is checked?
<input type="checkbox" v-model="checked">

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Question 5/10

How can you reset a form after submission in a Vue.js application?
methods: {
  resetForm() {
    this.formValues = {};
  }
}

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Question 6/10

Which Vue.js directive is used to bind input values to state properties?

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Question 7/10

How can you disable a form submit button until the form is valid in Vue.js?
<button :disabled="!isFormValid">Submit</button>

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Question 8/10

How can you handle form component validation using a third-party library like Vuelidate?

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Question 9/10

In Vue.js, how can you dynamically add a class to an input with an error?
<input :class="{'error-class': hasError}">

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Question 10/10

Which event modifier would you use in Vue.js to submit a form when the enter key is pressed in an input field?

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Your Answers

Question 1/10
😊 Your answer was correct 🙁 Your answer was incorrect
What is the purpose of the <code>lazy</code> modifier in Vue's <code>v-model</code>?

Available answers

The lazy modifier updates the model's value on the 'change' event instead of 'input'.
Question 2/10
😊 Your answer was correct 🙁 Your answer was incorrect
Given the following component methods, which one would be best for validating a form on submit in Vue.js?
methods: {
  validateForm() {
    // validation code
  },
  onSubmit() {
    this.validateForm();
    // submit form
  }
}

Available answers

onSubmit is typically used to handle form submission and would call validateForm to ensure data is valid before proceeding.
Question 3/10
😊 Your answer was correct 🙁 Your answer was incorrect
How do you prevent a form submission in Vue.js if validation fails?
methods: {
  onSubmit(event) {
    if (!this.isValid) {
      event.preventDefault();
    }
  }
}

Available answers

To prevent form submission, use event.preventDefault() within the submit event handler.
Question 4/10
😊 Your answer was correct 🙁 Your answer was incorrect
When using <code>v-model</code> on a checkbox, what does the value bind to when it is checked?
<input type="checkbox" v-model="checked">

Available answers

v-model on a checkbox binds to a boolean, representing if the checkbox is checked or not.
Question 5/10
😊 Your answer was correct 🙁 Your answer was incorrect
How can you reset a form after submission in a Vue.js application?
methods: {
  resetForm() {
    this.formValues = {};
  }
}

Available answers

You typically reset the form by reassigning the form data to its initial values.
Question 6/10
😊 Your answer was correct 🙁 Your answer was incorrect
Which Vue.js directive is used to bind input values to state properties?

Available answers

The v-model directive in Vue.js creates a two-way binding between form inputs and state properties.
Question 7/10
😊 Your answer was correct 🙁 Your answer was incorrect
How can you disable a form submit button until the form is valid in Vue.js?
<button :disabled="!isFormValid">Submit</button>

Available answers

You can use a computed property to determine form validity and bind it to the disabled attribute of the button.
Question 8/10
😊 Your answer was correct 🙁 Your answer was incorrect
How can you handle form component validation using a third-party library like Vuelidate?

Available answers

With Vuelidate, you define your validation rules and integrate them into your Vue component to handle validation.
Question 9/10
😊 Your answer was correct 🙁 Your answer was incorrect
In Vue.js, how can you dynamically add a class to an input with an error?
<input :class="{'error-class': hasError}">

Available answers

You can bind a class dynamically based on a state or computed property. In this case, :class is used with an object.
Question 10/10
😊 Your answer was correct 🙁 Your answer was incorrect
Which event modifier would you use in Vue.js to submit a form when the enter key is pressed in an input field?

Available answers

@keyup.enter listens for the enter key press and executes the associated method, useful for submitting forms.