Vue 3.0 V-model

Vue 3.0 v-model

The v-model directive in Vue 3.0 is a two-way data binding directive. It's often used with form inputs, allowing for data to be synced between the Vue instance's data and the form input.

Here's a simple step-by-step tutorial on how to use v-model in Vue 3:

Step 1: Start by initializing your Vue project.

You can create a new Vue 3 project using the Vue CLI.

vue create my-project

Remember to choose Vue 3 when asked which version of Vue to use.

Step 2: In your App.vue file, or any component you'd like to use v-model, add an input field and use the v-model directive to bind it to data.

Here's an example:

<template> <div class="app"> <input type="text" v-model="message" /> <p>The value of the input is: {{ message }}</p> </div> </template> <script> export default { data() { return { message: '' } } } </script>

In this example, the v-model directive is being used to bind the message data property to the input field. This creates a two-way data binding - when you type in the input field, message is updated, and if message is updated, the input field will reflect that change.

Step 3: Style your input as required.

You can add styles for your input in the <style> section of the component.

Step 4: Run your application.

You can run your Vue 3 application with the following command:

npm run serve

You should now see an input field in your application. When you type into the field, you should see the text update in real-time below the field, displaying the current value of the input.

The v-model directive can be used with any form input type (text, checkbox, select, etc.), and provides a convenient way to handle form input with Vue.

Examples

  1. Two-Way Data Binding with v-model in Vue 3.0:

    • Description: v-model provides two-way data binding on form input elements.
    • Code Example:
      <template> <input v-model="message" /> <p>{{ message }}</p> </template> <script> export default { data() { return { message: 'Hello Vue 3.0!', }; }, }; </script>

  2. Vue 3.0 Custom Components and v-model:

    • Code Example:
      <template> <custom-input v-model="customValue" /> </template> <script> import CustomInput from './CustomInput.vue'; export default { components: { CustomInput, }, data() { return { customValue: 'Custom Value', }; }, }; </script>

  3. Vue 3.0 v-model Modifiers:

    • Code Example:
      <template> <input v-model.trim="trimmedMessage" /> </template> <script> export default { data() { return { trimmedMessage: ' Trimmed Message ', }; }, }; </script>

  4. Dynamic Components and v-model in Vue 3.0:

    • Code Example:
      <template> <component :is="dynamicComponent" v-model="dynamicValue" /> </template> <script> export default { data() { return { dynamicComponent: 'input', dynamicValue: 'Dynamic Value', }; }, }; </script>

  5. Vue 3.0 v-model for Checkboxes and Radio Buttons:

    • Code Example:
      <template> <input type="checkbox" v-model="isChecked" /> <input type="radio" value="option1" v-model="selectedOption" /> </template> <script> export default { data() { return { isChecked: false, selectedOption: '', }; }, }; </script>

  6. Validating and Customizing v-model in Vue 3.0:

    • Code Example:
      <template> <input v-model.number="numericValue" /> </template> <script> export default { data() { return { numericValue: 42, }; }, }; </script>

  7. v-model with Computed Properties in Vue 3.0:

    • Code Example:
      <template> <input v-model="formattedMessage" /> </template> <script> export default { data() { return { message: 'Hello Vue 3.0!', }; }, computed: { formattedMessage: { get() { return this.message.toUpperCase(); }, set(value) { this.message = value.toLowerCase(); }, }, }, }; </script>

  8. Vue 3.0 v-model on Custom Form Elements:

    • Code Example:
      <template> <custom-form v-model="formData" /> </template> <script> import CustomForm from './CustomForm.vue'; export default { components: { CustomForm, }, data() { return { formData: 'Custom Form Data', }; }, }; </script>

  9. Vue 3.0 v-model lazy Modifier:

    • Code Example:
      <template> <input v-model.lazy="lazyMessage" /> </template> <script> export default { data() { return { lazyMessage: 'Lazy Message', }; }, }; </script>

  10. Vue 3.0 v-model Debounce Modifier:

    • Code Example:
      <template> <input v-model.debounce="debouncedMessage" /> </template> <script> export default { data() { return { debouncedMessage: 'Debounced Message', }; }, }; </script>

  11. Vue 3.0 v-model with Vuex State:

    • Code Example:
      <template> <input v-model="vuexStateMessage" /> </template> <script> import { mapState } from 'vuex'; export default { computed: { ...mapState('moduleA', ['vuexStateMessage']), }, }; </script>

  12. Vue 3.0 v-model in Functional Components:

    • Code Example:
      <template functional> <input v-model="props.value" /> </template> <script> export default { props: ['value'], }; </script>

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