Prompt user for numbers only (integer?)

Questions & Suggestions
1

Prompt user for numbers only (integer?)

How can I get the user to only input numbers, so that there isn't errors when you input for instance a number?

I'm a total noob, sorry for the dumb question!

Prompt for User Input.kmactions (809 B)

Keyboard Maestro Export.png1148×624 41.6 KB

2

Hey Gideon,

Not dumb at all. You just need to learn your way around Keyboard Maestro, and that takes time plus effort.

You cannot limit the input in a Prompt for User Input action. Everything is text.

You can validate the prompt after the user fills it in, and redisplay it for editing.

I'm using a regular expression to do this in the second action below.

Keyboard Maestro Actions.kmactions (3.3 KB)

You could even put that in a loop that would continue until the user provided the correct input.

The only way to force the correct input in the user-prompt would be to construct and use a Custom HTML Prompt action instead of using a plain old Prompt for User Input action -- but that's pretty advanced usage.

-Chris

3

and you could also use an IF THEN ELSE branch on a value returned by the built-in JavaScript isNaN function.

(It provides a broader check on whether a string is numeric – integer, decimal, scientific notation)

Check that input is numeric.kmmacros (24.7 KB)
mac2

(() => {
    'use strict';

    const main = () =>
        validatedLR(
            Application('Keyboard Maestro Engine')
            .getvariable('inputString')
        );


    // VALIDATED NUMBER STRINGS ---------------------------

    // validatedLR :: String -> Either String Num
    const validatedLR = s =>
        !s || isNaN(s) ? (
            Left(`Expected a number, but saw: '${s}'`)
        ) : Right(parseFloat(s, 10));

    // GENERIC FUNCTIONS ----------------------------------

    // https://github.com/RobTrew/prelude-jxa

    // Left :: a -> Either a b
    const Left = x => ({
        type: 'Either',
        Left: x
    });

    // Right :: b -> Either a b
    const Right = x => ({
        type: 'Either',
        Right: x
    });

    // showJSON :: a -> String
    const showJSON = x => JSON.stringify(x, null, 2);

    // MAIN ---
    return main();
})();
4

Super thanks, used Ccstone's suggestion, just put it into a loop :slight_smile:
Thanks you guys

1 Like