Restrict user to enter alphanumeric, lowercase and underscore(optional) only in variable

[Atheher Fathima]

Hi All,

My Requirement is to make a variable restriction where we allow users to enter only alphanumeric , lower case and underscore (optional). we need to restrict all other special characters spaces and line breaks.

I have created a catalog client script on change as below

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

var regex = new RegExp("^[a-z0-9]*_");

if(!regex.test(newValue)){

alert('Please note that application ID should not contain special characters or spaces.Please user lower case only');

g_form.setValue('u_application_id_tag','');

}
}

However I see that it is mandatory to have "_" or a number using this script. I would like to have the ability to fill the field with alphanumeric lower case only that may or may not contain numbers or underscore. How do i achieve this?

any assistance on this is greatly appreciated.

[Community Alums]

Hi @Atheher Fathima ,

so only alphabets a to z lowercase and A to Z uppercase and only 1 special character i.e. underscore is allowed.

use this script in client side

I believe this you want in onchange client script

function onChange(control, oldValue, newValue, isLoading, isTemplate) {
if (isLoading || newValue === '') {
return;
}

if(!/^[a-zA-Z_]+$/i.test(newValue)){
alert('Please enter only upper/lower case alphanumeric & underscore character');

g_form.clearValue('fieldName');

}

}