What is File Size filter in Vue.js?

Creating a file size filter in Vue.js allows us to format file sizes for display in a user-friendly manner, such as converting bytes to kilobytes, megabytes, etc. Let's create a simple file size filter:

Create the Filter

// FileSizeFilter.js

const FileSizeFilter = function(size) {
  if (isNaN(size)) return "Unknown";
  if (size < 1024) return size + " Bytes";
  if (size < 1024 * 1024) return (size / 1024).toFixed(2) + " KB";
  if (size < 1024 * 1024 * 1024) return (size / (1024 * 1024)).toFixed(2) + " MB";
  if (size < 1024 * 1024 * 1024 * 1024) return (size / (1024 * 1024 * 1024)).toFixed(2) + " GB";
  return (size / (1024 * 1024 * 1024 * 1024)).toFixed(2) + " TB";
};

export default FileSizeFilter;

JavaScript

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This filter function takes a file size in bytes as input and returns a human-readable string representing the size in bytes, kilobytes, megabytes, gigabytes, or terabytes, depending on the size.

In this filter, we define a function that takes a file size (in bytes) as input and returns a formatted string representing the size in a human-readable format (e.g., KB, MB, GB, TB).

Register the Filter Globally

You can register the filter globally so it can be used in any component without importing it explicitly:

// main.js or wherever you initialize your Vue app

import Vue from 'vue';
import FileSizeFilter from './FileSizeFilter';

Vue.filter('fileSize', FileSizeFilter);

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Use the Filter in a Vue Component:

<template>
  <div>
    <p>File size: {{ fileSize | fileSize }}</p>
  </div>
</template>

<script>
export default {
  data() {
    return {
      fileSize: 1024 // Example file size in bytes
    };
  }
}
</script>

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In this example, we're using the fileSize filter on a variable named fileSize, which represents the size of a file in bytes.

Result

When rendered, the file size will be displayed in a user-friendly format according to the filter:

• If the file size is less than 1 KB, it will be displayed in bytes.
• If it's between 1 KB and 1 MB, it will be displayed in kilobytes with two decimal places.
• If it's between 1 MB and 1 GB, it will be displayed in megabytes with two decimal places.
• If it's between 1 GB and 1 TB, it will be displayed in gigabytes with two decimal places.
• If it's greater than 1 TB, it will be displayed in terabytes with two decimal places.

We've created a file size filter in Vue.js that formats file sizes into a human-readable format. Now, we can easily use this filter throughout your Vue.js application to display file sizes in a more understandable way.