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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.

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>

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>

Vue 3.0 v-model Modifiers:

Code Example:

<template>
  <input v-model.trim="trimmedMessage" />
</template>

<script>
export default {
  data() {
    return {
      trimmedMessage: '   Trimmed Message   ',
    };
  },
};
</script>

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>

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>

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>

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>

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>

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>

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>

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>

Vue 3.0 v-model in Functional Components:

Code Example:

<template functional>
  <input v-model="props.value" />
</template>

<script>
export default {
  props: ['value'],
};
</script>