Allow only numbers and symbols in a field

[kknm]

How to allow entering only numbers and certain characters in a table field :
+
-
=

[kev1n]

Hi,

Do you want the validation to happen in the browser using JavaScript?

[kknm]

I would like to have a field restriction on alphabetic characters

[kev1n]

alphabetic characters means letters A–Z and a–z, but initially you wrote "only numbers and certain characters".

[kknm]

For starters, you can only ban letters

[kev1n]

For example, to allow only digits and the characters +, -, =:
Add an oninput event to your input object and call validateInput(this);.
In the form’s Custom Code, declare the function:

Code: Select all

function validateInput(input) {
    // Allow digits, +, -, =
    let regex = /^(\d|[+\-=])*$/;
    if (!regex.test(input.value)) {
        input.value = input.value.slice(0, -1); // remove last invalid character
    }
}

You can use AI to help modify the regex if you need to allow additional characters or other patterns.

[kknm]

Brilliantly !! Thank you !