Скачать или смотреть How to Ensure Your p:inputNumber Only Accepts Numeric Input in PrimeFaces

Discover how to restrict input in PrimeFaces using JavaScript to allow only numeric entries in the `p:inputNumber`.
---
This video is based on the question https://stackoverflow.com/q/67484403/ asked by the user 'Nasir Abbas' ( https://stackoverflow.com/u/7824150/ ) and on the answer https://stackoverflow.com/a/67679715/ provided by the user 'Nasir Abbas' ( https://stackoverflow.com/u/7824150/ ) at 'Stack Overflow' website. Thanks to these great users and Stackexchange community for their contributions.

Visit these links for original content and any more details, such as alternate solutions, latest updates/developments on topic, comments, revision history etc. For example, the original title of the Question was: inputNumber does not work i.e. allows alphabets

Also, Content (except music) licensed under CC BY-SA https://meta.stackexchange.com/help/l...
The original Question post is licensed under the 'CC BY-SA 4.0' ( https://creativecommons.org/licenses/... ) license, and the original Answer post is licensed under the 'CC BY-SA 4.0' ( https://creativecommons.org/licenses/... ) license.

If anything seems off to you, please feel free to write me at vlogize [AT] gmail [DOT] com.
---
Ensuring Numeric Input in PrimeFaces Using p:inputNumber

When developing web applications using PrimeFaces, you might encounter an issue with the p:inputNumber component. Although it's intended to accept only numeric input, you may find that it allows non-numeric characters as well, such as alphabets. This can lead to potential data quality issues and user frustration. Fortunately, there is a straightforward solution to ensure your input fields behave as expected.

The Problem Explained

In your application, you might have implemented a PrimeFaces component as follows:

[[See Video to Reveal this Text or Code Snippet]]

While expecting this component to only accept numbers, you notice that users can input letters and other invalid characters. This issue can undermine data integrity in scenarios where only numeric input is required.

The Solution: Customized Input Validation

To resolve this issue effectively, we can implement a JavaScript function that restricts what users can type into the input field. Here's how we can go about it:

Step 1: Replace p:inputNumber with p:inputText

Since validating input for alphabets is simpler through p:inputText, we shall modify our component as follows:

[[See Video to Reveal this Text or Code Snippet]]

Step 2: Implement the JavaScript Function

Now, we need to define the JavaScript function keyPressCheck that will check every keystroke against specific conditions. Here’s the code for the function:

[[See Video to Reveal this Text or Code Snippet]]

Breakdown of the Function

Parameters:

kp: The keycode of the pressed key.

cv: The current value in the input field.

isN: A flag indicating whether the input type is numeric.

Logic:

If isN is set to 1 (indicating numeric input), the function:

Checks for Decimal: Allows the decimal point (key code 46) only if it’s not already in use.

Restricts Non-Numeric Input: Blocks all keys outside the range of ASCII codes for digits (48-57).

If isN is not 1, the function returns true, allowing other types of input.

Conclusion

By implementing this JavaScript validation function alongside your PrimeFaces input, you ensure that the field accepts only valid numeric input, enhancing the user experience and maintaining data integrity. This method is efficient and can easily be adapted for different input types or validation rules. With these changes, you can confidently collect the right data from your users without the hassle of unwanted inputs.

Feel free to try this approach in your application and share your experiences. Happy coding!