How to use the filter function in vue

The filter function of Vue.js is used to format data and display it in a specific format in the view. It can receive a conversion function as a parameter. Usage: {{ value | filterName }}. Multiple filters can be connected in series, and custom filters can be registered on the instance or globally.

How to use the filter function in Vue.js

Question: What is the usage of the filter function in Vue.js ?

Answer:
The filter function of Vue.js is used to format data and display it in a specific format in the view. It receives as argument a function that converts the input value into the desired output value.

Usage:

<code class="html">{{ value | filterName }}</code>

Where:

• value is the data value to be formatted.
• filterName is the name of the registered filter function.

Example:

Convert number to currency format:

<code class="html">{{ price | currency }}</code>

Format date to dd/mm/yyyy:

<code class="html">{{ date | date('dd/mm/yyyy') }}</code>

Register a custom filter:

<code class="javascript">Vue.filter('capitalize', function(value) {
  if (!value) return '';
  return value.charAt(0).toUpperCase() + value.slice(1);
});</code>

The above defines a filter function named capitalize, capitalizing the first letter.

Note:

• The filter function only works in the view and does not modify the data itself.
• You can use Vue.js’s pipe operator (|) to concatenate multiple filters.
• Custom filters can be registered in the Vue instance or globally.

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