Vue 3.0 Filters

Vue 3.0 filters

In Vue 3, filters are removed and are no longer part of the official API. Filters were a way to apply common text formatting in Vue 2, but you can easily replace them with methods, computed properties or even a plugin if needed.

Here's how you can replace filters with methods and computed properties:

  1. Methods

    Methods are a good replacement for filters that take arguments:

    <template> <div>{{ formatName(user) }}</div> </template> <script> export default { data() { return { user: { firstName: 'John', lastName: 'Doe' } } }, methods: { formatName(user) { return `${user.lastName}, ${user.firstName}` } } } </script>

  2. Computed Properties

    Computed properties are the way to go for more complex formatting that depends on reactive data:

    <template> <div>{{ fullName }}</div> </template> <script> import { ref, computed } from 'vue'; export default { setup() { const user = ref({ firstName: 'John', lastName: 'Doe' }); const fullName = computed(() => `${user.value.lastName}, ${user.value.firstName}`); return { fullName } } } </script>

  3. Global Filters Replacement

    In Vue 2, you could define global filters that would be available in all components. You can achieve similar functionality in Vue 3 by creating a global mixin and defining methods in it:

    import { createApp } from 'vue'; import App from './App.vue'; const app = createApp(App); app.mixin({ methods: { formatCurrency(value) { return new Intl.NumberFormat('en-US', { style: 'currency', currency: 'USD' }).format(value); } } }); app.mount('#app');

    Then in any component:

    <template> <div>{{ formatCurrency(price) }}</div> </template> <script> export default { data() { return { price: 100 } } } </script>

In general, the removal of filters in Vue 3 simplifies the API and encourages the use of methods and computed properties, which are just as powerful and flexible.

Examples

  1. Vue 3.0 Built-in Filters: Vue 3.0 has a set of built-in filters for common tasks like formatting dates, currency, and more. For instance, uppercase, lowercase, capitalize, currency, and date are some examples.

    <!-- Example --> <p>{{ message | uppercase }}</p>

  2. Creating Custom Filters: You can create custom filters using app.directive in the setup function.

    // Example custom filter to reverse a string app.directive('reverse', { mounted(el, binding) { el.textContent = binding.value.split('').reverse().join(''); }, }); 
    <!-- Using the custom filter --> <p v-reverse>{{ message }}</p>

  3. Applying Filters in Vue 3.0 Templates: Filters can be applied directly in templates using the | syntax.

    <!-- Applying a built-in filter --> <p>{{ dateValue | date('YYYY-MM-DD') }}</p>

  4. Vue 3.0 Filter Arguments: Filters can accept arguments for customization.

    <!-- Using a filter with arguments --> <p>{{ price | currency('USD', 2) }}</p>

  5. Chaining Filters: Filters can be chained to perform multiple transformations.

    <!-- Chaining filters --> <p>{{ message | uppercase | reverse }}</p>

  6. Vue 3.0 Filter Usage in Computed Properties: Filters can be used in computed properties for dynamic transformations.

    computed: { formattedMessage() { return this.message | uppercase | reverse; }, },

  7. Vue 3.0 Dynamic Filters: You can dynamically apply filters based on conditions.

    <!-- Dynamic filter --> <p v-if="isUppercase">{{ message | uppercase }}</p> <p v-else>{{ message | lowercase }}</p>

  8. Vue 3.0 Global Filters: Global filters can be defined and used across components.

    app.config.globalProperties.$filters = { reverse(value) { return value.split('').reverse().join(''); }, }; 
    <!-- Using a global filter --> <p>{{ message | $filters.reverse }}</p>

  9. Using Filters with v-bind: Filters can be used with v-bind for dynamic attribute values.

    <img :src="imagePath | addBaseUrl" alt="Product Image">

  10. Updating Filters with Reactivity: Ensure reactivity by using reactive properties within filters.

    computed: { reversedMessage() { return this.message.split('').reverse().join(''); }, }, 
    <p>{{ reversedMessage }}</p>

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