3 ways Jquery limits text boxes to alphanumeric types

OnlyNum (), onlyAlpha(), and onlyNumAlpha() are 3 Jquery extension methods

Number. Js

// ----------------------------------------------------------------------

// <summary>

//Limit the number to 

// </summary>

// ----------------------------------------------------------------------

$.fn.onlyNum = function () {

    $(this).keypress(function (event) {

        var eventObj = event || e;

        var keyCode = eventObj.keyCode || eventObj.which;

        if ((keyCode >= 48 && keyCode <= 57))

            return true;

        else

            return false;

    }).focus(function () {

    //Disable the input method 

        this.style.imeMode = 'disabled';

    }).bind("paste", function () {

    //Gets the contents of the clipboard 

        var clipboard = window.clipboardData.getData("Text");

        if (/^d+$/.test(clipboard))

            return true;

        else

            return false;

    });

};

Letter. Js

// ----------------------------------------------------------------------

// <summary>

//Limit the input to 

// </summary>

// ----------------------------------------------------------------------

$.fn.onlyAlpha = function () {

    $(this).keypress(function (event) {

        var eventObj = event || e;

        var keyCode = eventObj.keyCode || eventObj.which;

        if ((keyCode >= 65 && keyCode <= 90) || (keyCode >= 97 && keyCode <= 122))

            return true;

        else

            return false;

    }).focus(function () {

        this.style.imeMode = 'disabled';

    }).bind("paste", function () {

        var clipboard = window.clipboardData.getData("Text");

        if (/^[a-zA-Z]+$/.test(clipboard))

            return true;

        else

            return false;

    });

};

Number_letter. Js

// ----------------------------------------------------------------------

// <summary>

//Limit input to Numbers and letters 

// </summary>

// ----------------------------------------------------------------------

$.fn.onlyNumAlpha = function () {

    $(this).keypress(function (event) {

        var eventObj = event || e;

        var keyCode = eventObj.keyCode || eventObj.which;

        if ((keyCode >= 48 && keyCode <= 57) || (keyCode >= 65 && keyCode <= 90) || (keyCode >= 97 && keyCode <= 122))

            return true;

        else

            return false;

    }).focus(function () {

        this.style.imeMode = 'disabled';

    }).bind("paste", function () {

        var clipboard = window.clipboardData.getData("Text");

        if (/^(d|[a-zA-Z])+$/.test(clipboard))

            return true;

        else

            return false;

    });

};

Use. Js

$(function () {

    //Controls that use the onlyNum class style are limited to entering Numbers 

    $(".onlyNum").onlyNum();

    //Controls that use the onlyAlpha class style are restricted to typing the letter 

    $(".onlyAlpha").onlyAlpha();

    //Controls that use the onlyNumAlpha class style are restricted to entering Numbers and letters 

    $(".onlyNumAlpha").onlyNumAlpha();

The above methods can achieve the project requirements, we according to their own specific needs free choice