Custom v-model on components in Vue - Cheat Sheet & Quick Revision

Recall & Review

beginner

What is the purpose of using a custom v-model on Vue components?

A custom v-model allows a component to define its own prop and event names for two-way binding, making it easier to integrate with parent components while keeping clear and flexible data flow.

beginner

Which prop and event names does Vue use by default for v-model on components?

By default, Vue uses the prop named modelValue and the event named update:modelValue for v-model bindings on components.

intermediate

How do you define a custom v-model with a different prop and event name in a Vue component?

You use the model option in the component to specify the prop and event names, for example: model: { prop: 'checked', event: 'change' }.

intermediate

In Vue 3, how can you customize the v-model binding on a component without using the model option?

In Vue 3, you can define multiple v-model bindings by using v-model:customName syntax and then define props and emit events like customName and update:customName respectively.

beginner

Why is it important to emit the correct event name when implementing a custom v-model?

Emitting the correct event name (like update:modelValue or update:customProp) ensures Vue detects the change and updates the bound value in the parent component, enabling two-way binding to work properly.

What is the default prop name used by Vue's v-model on components?

A inputValue

B value

C checked

D modelValue

Vue uses modelValue as the default prop name for v-model on components.

Which event should a component emit to update the default v-model binding?

A input

B change

C update:modelValue

D update:value

The event update:modelValue is emitted to update the default v-model binding.

How do you bind a custom v-model named 'checked' in Vue 3?

A v-model:checked

B v-bind:checked

C v-model

D v-on:checked

Use v-model:checked to bind a custom v-model named 'checked' in Vue 3.

Which of these is NOT a correct way to customize v-model in Vue 3?

A Using the <code>model</code> option to rename prop and event

B Changing the <code>v-model</code> directive syntax to <code>v-bind:modelValue</code>

C Emitting <code>update:customName</code> event

D Using <code>v-model:customName</code> with matching prop and event

Changing v-model to v-bind:modelValue does not customize v-model behavior.

Why might you want to create a custom v-model instead of using the default?

A To use a more meaningful prop name for your component

B To avoid two-way binding

C To disable event emission

D To make the component static

Custom v-model lets you use prop names that better describe your component's data.

Explain how to create a custom v-model in Vue 3 and why it is useful.

Think about how Vue links props and events for two-way binding.

Describe the role of the event emitted by a component when using v-model and what happens if it is missing or incorrect.

Consider how Vue listens for changes from child components.