Field message not showing on catalog variable

[DevtoSME]

I created a onchange client script to prevent special characters from being entered on the field but my field message is not displaying. can anyone help. is this not applicable or is there n issue with the code. i

function onChange(control, oldValue, newValue, isLoading) {
    if (isLoading) {
        return; 
    }

    // Disallow special characters in abbreviation name
    var alpha = /^[\s0-9a-zA-Z]*$/;

    // 
    var isValid = alpha.test(newValue);

    if (!isValid) {
        // Show an error message
        g_form.showFieldMsg('field_name', 'Special characters are not allowed.', 'error');

        // Clear the invalid input 
        g_form.setValue('field_name', oldValue);
    } else {
        // Remove any previous error message if the input is valid
        g_form.hideFieldMsg('field_name');
    }
}

[Brad Bowman · Accepted solution]

Try a more traditional regex approach

function onChange(control, oldValue, newValue, isLoading) {
    if (isLoading) {
        return; 
    }

    // Disallow special characters in abbreviation name
    var alpha = new RegExp("^[\s0-9a-zA-Z]*$");

    // 
    var isValid = alpha.test(newValue);

    if (!isValid) {
        // Show an error message
        g_form.showFieldMsg('field_name', 'Special characters are not allowed.', 'error');

        // Clear the invalid input 
        g_form.setValue('field_name', oldValue);
    } else {
        // Remove any previous error message if the input is valid
        g_form.hideFieldMsg('field_name');
    }
}

And if you are doing this on a Catalog Item variable as opposed to a form/table field, try the variable validation feature instead. 

[DevtoSME]

i looked up the variable validation feature and did it that way. I wasn't privy to this addition. Thankyou 

[SunnySharma]

Hi DevtoSME,

In above code you need to just 'set the value' before the Field Error Message is shown.

function onChange(control, oldValue, newValue, isLoading) {
    if (isLoading) {
        return; 
    }

    // Disallow special characters in abbreviation name
    var alpha = /^[\s0-9a-zA-Z]*$/;

    // 
    var isValid = alpha.test(newValue);

    if (!isValid) {
        // Clear the invalid input 
        g_form.setValue('field_name', oldValue);

        // Show an error message
        g_form.showFieldMsg('field_name', 'Special characters are not allowed.', 'error');

    } else {
        // Remove any previous error message if the input is valid
        g_form.hideFieldMsg('field_name');
    }
}