If you use FluentValidation and set a maximum length for a string or a maximum value for a numeric property, JQuery validation is used to show an error message when the user inputs too many characters or a numeric value which is too big. On a recent project we wanted to use input’s maxlength attribute to prevent a user from entering too many characters rather than cure the problem with an error message, and I added this JQuery to add maxlength attributes based on JQuery validation’s data- attributes.

$(function () {
        .each(function (i, e) {
            var input = $(e);
            var maxlength = input.is("[data-val-range-max]")
                ? input.data("valRangeMax").toString().length
                : input.data("valLengthMax");
            input.attr("maxlength", maxlength);