Usage and function of filter in vue

The filter in Vue.js is a parser used to format or convert data. You can use the pipe symbol (|) followed by the filter name and parameters in the Vue.js template to format the data. , transform data, reuse code, and improve code readability.

The usage and function of filter in Vue.js

What is filter?

filter in Vue.js is a parser used to format or transform data. It allows you to convert raw data into the required format for display at the view layer.

Usage

Using filter in Vue.js is very simple, you can follow the following steps:

1. Define filter: Use the Vue.filter() method to define a filter.
2. Specify name: Specify a unique name for filter.
3. Write a conversion function: Write a function that accepts one or more parameters and returns the converted data.

The following is an example of defining a filter:

<code class="javascript">Vue.filter('uppercase', function (value) {
  return value.toUpperCase();
});</code>

Function

filter has the following functions in Vue.js:

• Format data: Convert raw data into the required format for display in the view layer.
• Convert data: Convert data as needed, such as converting numbers to currency format or dates to readable format.
• Reuse code: By encapsulating the data conversion logic in filter, it can be easily reused in multiple components.
• Improve readability: Using filter can make the template easier to read and maintain, because the conversion logic is no longer contained in the template.

How to use filter?

When using filter in a Vue.js template, use the pipe symbol (|) after the variable name or expression, and then specify the filter name and parameters.

For example:

<code class="html"><p>{{ message | uppercase }}</p></code>

In this example, the uppercase filter converts the value of the message variable to uppercase.

Conclusion

Filter in Vue.js is a powerful tool that can be used to format and transform data, thereby improving code readability and reusability . By using filters, you can easily convert raw data into the desired format for display in the view layer.

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