Allowing User Input Between user1 to user100 Using jQuery Validation

Описание: Learn how to use jQuery to validate user input and ensure only codes between `user1` and `user100` are accepted. Improve your web forms with easy regex validation techniques!
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This video is based on the question https://stackoverflow.com/q/66115791/ asked by the user 'md server' ( https://stackoverflow.com/u/10644170/ ) and on the answer https://stackoverflow.com/a/66116166/ provided by the user 'Frenchy' ( https://stackoverflow.com/u/7380779/ ) at 'Stack Overflow' website. Thanks to these great users and Stackexchange community for their contributions.

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Validating User Input: Accepting Codes from user1 to user100 with jQuery

When it comes to web forms, ensuring that users enter valid data is crucial. Misformatted inputs can lead to errors down the line, cluttering your database with unwanted data. One common validation scenario is to limit user input to a specific range of codes. In this post, we’ll demonstrate how to use jQuery and regular expressions (regex) to validate that a user enters codes ranging from user1 to user100.

The Problem

Imagine a situation where you ask users to input codes in a specific format. For instance, you want to only accept codes like user1, user2, ..., up to user100. Any input outside of this range should prompt an error message, guiding the user to enter valid data.

Here’s a sample form where we want this functionality:

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The Solution: Regex and jQuery

Step 1: Understanding Regular Expressions

Regular expressions allow you to define a search pattern, which is extremely helpful in validating user input. To ensure that the input matches the desired codes, we can create a regex pattern that captures user followed by a number between 1 and 100.

For our use case, the regex pattern will be:

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This pattern means:

^ Start of the string

user Matches the literal text "user"

(?:...) A non-capturing group

[1-9][0-9]{0,1}: Matches numbers from 1-99 (1 or 2 digits).

|100: Matches the number 100 directly.

$ End of the string

Step 2: Implementing the Regex with jQuery

Now that we have our regex pattern ready, we can integrate it with jQuery to validate user input. Here’s the complete JavaScript solution:

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Step 3: Including jQuery in Your Project

To use jQuery for validation, you must include it in your HTML file. Here’s how to do it:

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Your complete HTML form with the validation logic might look like this:

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Conclusion

In this guide, we covered how to allow users to input a code between user1 and user100 using jQuery validation and regular expressions. Implementing this simple yet effective validation rule can greatly enhance the user experience on your web forms, reducing frustration and ensuring proper data entry. Happy coding!