Angular 2 Pipe Parameters: How to Specify for Number Pipe

When working with the Angular 2 framework, pipes provide a powerful tool for transforming data before it is rendered in the view. One of the built-in pipes, the number pipe, allows you to format numbers in a variety of ways. However, you may need to specify parameters to customize the formatting to your specific needs. In this article, we'll explore how to specify parameters for the number pipe.

Using the Number Pipe

First, let's take a look at how to use the number pipe. The number pipe is used by adding the | number pipe to the end of a number expression in the template. For example:

<p>{{ 1234.567 | number }}</p>

This will output 1,234.57, as the default behavior of the number pipe is to display two decimal places and comma separators for thousands.

Specifying Parameters

Now, let's say we want to customize the output to display only one decimal place and use a period as the decimal separator. We can do this by specifying parameters for the number pipe.

To specify parameters for the number pipe, we use the following syntax:

| number:'format':'locale'

The format parameter is a string that specifies the format of the number. The locale parameter is a string that specifies the locale to use for formatting the number.

For our example, we can use the following code:

<p>{{ 1234.567 | number:'1.1-1':'en-US' }}</p>

This will output 1,234.6, as we specified one digit before the decimal point, one digit after the decimal point, and one digit for the thousands separator. We also specified the locale as en-US to use a period as the decimal separator.

Conclusion

The Angular 2 number pipe provides a powerful tool for formatting numbers in your templates. By specifying parameters, you can customize the formatting to your specific needs. Use the | number pipe with the format and locale parameters to achieve the desired output.