The role of filters in vue

A filter in Vue.js is a function that formats or transforms data so that it is presented in a template in a more readable and understandable way without modifying the underlying data itself.

The role of Filters in Vue.js

The filter (Filter) in Vue.js is a function , which can be used to format or transform data so that it is presented in a more readable and understandable way in the template. It allows developers to perform custom processing on data without modifying the underlying data itself.

Usage of Filter

Filters are used in two main ways in Vue.js:

• Global filter : Registered through the Vue.filter() method and can be used in all components.
• Partial filter: Defined directly in the template and used only in that specific template.

Syntax

Global filter:

Vue.filter('filterName', (value) => {
  // 自定义数据处理逻辑
  return formattedValue;
});

Local filter:

<template>
  <p>{{ message | filterName }}</p>
</template>

<script>
  export default {
    filters: {
      filterName: (value) => {
        // 自定义数据处理逻辑
        return formattedValue;
      }
    }
  }
</script>

Example

A common filter example is to format a number as currency:

Vue.filter('currency', (value) => {
  if (!value) return 'N/A';
  return `$${value.toFixed(2)}`;
});

Benefits

Benefits of using filters include:

• Reusability: Filters can be easily reused across multiple components, making your code more efficient.
• Data readability: Filters make data more readable and understandable in templates.
• Template Simplicity: Templates can be made more concise and maintainable by moving data formatting logic to filters.

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