Trying to limit the size of a field. 

View from the debugger.

Code Source:

https://community.nintex.com/community/build-your-own/blog/2014/12/08/nintex-forms-how-to-limit-maximum-length-of-input-field-during-typing

NWF$(document).ready(function(){
NWF$("body").append('<div id="charCounter";></div>'); // create div for counter
var zaehlerFeld = NWF$('#charCounter'); // save as jquery object
zaehlerFeld.hide(); // hide the div
NWF$(""class*=kob-maxtextlen-]").each(function () { // for all html elemts with class name beginning with kob-maxtext-len
var classes = this.className.split(" "); // splitt class names
for (var i = 0; i < classes.length; i++) { // for all class names of the actual html
if (classes.substr(0, 15) == "kob-maxtextlen-") { // check if class name begins with kob-maxtext-len
var maxlen = parseInt(classes.split('kob-maxtextlen-'))1]); // extract the number at the end of the class name
NWF$(this).on('focus input blur', function () { // define an event function
zaehlerFeld.show(); // show counter
zaehlerFeld.css({ // format counter
"text-align":"center",
"display":"inline-block",
"background-color":"#FFF",
"border":"1px solid",
"box-shadow":"3px 3px 3px #888",
"height":"16px",
"width":"22px"
});
MaxTextLaenge(NWF$(this), maxlen, zaehlerFeld); / call check function
});
NWF$(this).blur(function () {
zaehlerFeld.text(' ');
zaehlerFeld.hide();
});
}
}
});
});

function MaxTextLaenge(textFeld, maxAnzahl, zaehlerFeld) {
zaehlerFeld.position({ // positioning the counter
my: "left top-16",
at: "left top",
of: textFeld,
collision: "fit"
});
if (textFeld.val().length > maxAnzahl) { // more then max characters enterd
textFeld.val(textFeld.val().substr(0, maxAnzahl)); // limit to max text length
textFeld.css('border-color', 'red'); // show control border in red
zaehlerFeld.text(0); // no more input allowed
} else {
zaehlerFeld.text(maxAnzahl - textFeld.val().length); // count down counter
textFeld.css('border-color', ""); // normal border
}
}