How to allow only numeric (0-9) in HTML inputbox using jQuery?

You can try the HTML5 number input:

<input type="number" placeholder="enter the number" min="0" max="9">

This input tag element would now take value only between 0 to 9 as min attribute is set to 0 and max attribute is set to 9.

for more information on visit http://www.w3schools.com/html/html_form_input_types.asp

To elaborate a little more on answer #3 I'd do the following (NOTE: still does not support paste oprations through keyboard or mouse):

$('#txtNumeric').keypress(
            function(event) {
                //Allow only backspace and delete
                if (event.keyCode != 46 && event.keyCode != 8) {
                    if (!parseInt(String.fromCharCode(event.which))) {
                        event.preventDefault();
                    }
                }
            }
        );

I had a problem with the top-answer. It doesn't include the numerical keypad and if one presses shift+number the special-signs shouldn't be displayed either.. but this solution doesn't take care of it.

The best link I've found in this thread was this: http://www.west-wind.com/weblog/posts/2011/Apr/22/Restricting-Input-in-HTML-Textboxes-to-Numeric-Values

I'm new to stackoverflow so I don't know if I can just edit the better solution into the top-post.

If you have to solve diacritics and special characters, try to use this:

$(this).on( 'keypress', function( e )
{
    // Ensure that it is a number and stop the keypress
    if (e.shiftKey || (e.keyCode < 48 || e.keyCode > 57)) {
        e.preventDefault();
    }
});  

Here is way with regular expression:

$('input').bind('keypress', function (event) {
var regex = new RegExp("^[0-9]+$");
var key = String.fromCharCode(!event.charCode ? event.which : event.charCode);
if (!regex.test(key)) {
   event.preventDefault();
   return false;
}

});

https://jsfiddle.net/astrapi69/qbk2vjty/1/

And you can change the regular expression to anything else if you want to restrict other characters then numbers.

This is why I recently wrote to accomplish this. I know this has already been answered but I'm leaving this for later uses.

This method only allows 0-9 both keyboard and numpad, backspaces, tab, left and right arrows (normal form operations)

$(".numbersonly-format").keydown(function (event) {
    // Prevent shift key since its not needed
    if (event.shiftKey == true) {
        event.preventDefault();
    }
    // Allow Only: keyboard 0-9, numpad 0-9, backspace, tab, left arrow, right arrow, delete
    if ((event.keyCode >= 48 && event.keyCode <= 57) || (event.keyCode >= 96 && event.keyCode <= 105) || event.keyCode == 8 || event.keyCode == 9 || event.keyCode == 37 || event.keyCode == 39 || event.keyCode == 46) {
        // Allow normal operation
    } else {
        // Prevent the rest
        event.preventDefault();
    }
});

this one was very helpful http://jstepper.emkay.dk/Default.aspx the other ones accepts languages different than English

/**
Makes the textbox to accept only numeric input
*/

(function($) {
    $.fn.allowOnlyNumeric = function() {

        /**
        The interval code is commented as every 250 ms onchange of the textbox gets fired.
        */

        //  var createDelegate = function(context, method) {
        //      return function() { method.apply(context, arguments); };
        //  };

        /**
        Checks whether the key is only numeric.
        */
        var isValid = function(key) {
            var validChars = "0123456789";
            var validChar = validChars.indexOf(key) != -1;
            return validChar;
        };

        /**
        Fires the key down event to prevent the control and alt keys
        */
        var keydown = function(evt) {
            if (evt.ctrlKey || evt.altKey) {
                evt.preventDefault();
            }
        };

        /**
        Fires the key press of the text box   
        */
        var keypress = function(evt) {
            var scanCode;
            //scanCode = evt.which;
            if (evt.charCode) { //For ff
                scanCode = evt.charCode;
            }
            else { //For ie
                scanCode = evt.keyCode;
            }

            if (scanCode && scanCode >= 0x20 /* space */) {
                var c = String.fromCharCode(scanCode);
                if (!isValid(c)) {
                    evt.preventDefault();
                }
            }
        };

        /**
        Fires the lost focus event of the textbox   
        */
        var onchange = function() {
            var result = [];
            var enteredText = $(this).val();
            for (var i = 0; i < enteredText.length; i++) {
                var ch = enteredText.substring(i, i + 1);
                if (isValid(ch)) {
                    result.push(ch);
                }
            }
            var resultString = result.join('');
            if (enteredText != resultString) {
                $(this).val(resultString);
            }

        };

        //var _filterInterval = 250;
        //var _intervalID = null;

        //var _intervalHandler = null;

        /**
        Dispose of the textbox to unbind the events.
        */
        this.dispose = function() {
            $(this).die('change', onchange);
            $(this).die('keypress', keypress);
            $(this).die('keydown', keydown);
            //window.clearInterval(_intervalHandler);
        };

        $(this).live('change', onchange);
        $(this).live('keypress', keypress);
        $(this).live('keydown', keydown);
        //_intervalHandler = createDelegate(this, onchange);
        //_intervalID = window.setInterval(_intervalHandler, _filterInterval);
    }
})(jQuery);

The above $ plugin is written from the AjaxControlToolkit filter textbox extender.js.

However one behavior is not borrowed from the AjaxControlToolkit is that when the user copies and pastes any non-numeric value then the onchange event fires up and text box eats up the values. I went through the code and found out for this onchange was called after every 250ms, which is a performance hit, hence commented that part.

You could also use this jQuery plugin, jQuery alphaNumeric. I found it to be really great.

It may be overkill for what you are looking for, yet I suggest a jQuery plugin called autoNumeric() - it is great!

You can limit to only numbers, decimal precision, max / min values and more.

http://www.decorplanit.com/plugin/

You can use HTML5 input type number to restrict only number entries:

<input type="number" name="someid" />

This will work only in HTML5 complaint browser. Make sure your html document's doctype is:

<!DOCTYPE html>

For general purpose, you can have JS validation as below:

function isNumberKey(evt){
    var charCode = (evt.which) ? evt.which : event.keyCode
    if (charCode > 31 && (charCode < 48 || charCode > 57))
        return false;
    return true;
}

<input type="someid" name="number" onkeypress="return isNumberKey(event)"/>

If you want to allow decimals replace the "if condition" with this:

if (charCode > 31 && (charCode != 46 &&(charCode < 48 || charCode > 57)))

Source: HTML Text Input allow only Numeric input

JSFiddle demo: http://jsfiddle.net/Gagan_Gami/nSjy7/333/

This (jQuery numeric plugin) one works fine and has some neat features but you might have to adjust it a little bit for your needs and IE support.

I recommend to check event.metaKey as well. If that's set to true, the user might be doing something like cmd-A to select all the text in the field. You should allow that too.

I'm using in this form. Seems correct to me allow keys like home, end, shift and ctrl, with the drawback of the user to can print special chars:

$("#busca_cep").keydown(function(event) {
    if ( event.keyCode == 46 || event.keyCode == 8 || event.keyCode == 13 || event.keyCode == 16 || event.keyCode == 36 || event.keyCode == 35) {
        if (event.keyCode == 13) {
            localiza_cep(this.value);
        }
    } else {
        if ((event.keyCode < 48 || event.keyCode > 57) && (event.keyCode < 96 || event.keyCode > 105 )) {
            event.preventDefault(); 
        }   
    }
});

Use the jquery numeric value. Below function allows for decimal and numeric values.
Example: $("#inputId").numeric({ allow: "." });

Another approach is below. This will take care of pasting also. [it is for alpha-numeric validation]

//Input Validation
var existingLogDescription = "";

$('.logDescription').keydown(function (event) {
    existingLogDescription = this.value;

});


$('.logDescription').keyup(function () {
    if (this.value.match(/[^a-zA-Z0-9 ]/g)) {
        alert("Log Description should contain alpha-numeric values only");
        this.value = this.value.replace(/[^a-zA-Z0-9 ]/g, '');
        this.value = existingLogDescription;
    }
});

This jQuery code filters out characters typed while Shift, Ctrl or Alt is held down.

$('#AmountText').keydown(function (e) {
    if (e.shiftKey || e.ctrlKey || e.altKey) { // if shift, ctrl or alt keys held down
        e.preventDefault();         // Prevent character input
    } else {
        var n = e.keyCode;
        if (!((n == 8)              // backspace
        || (n == 46)                // delete
        || (n >= 35 && n <= 40)     // arrow keys/home/end
        || (n >= 48 && n <= 57)     // numbers on keyboard
        || (n >= 96 && n <= 105))   // number on keypad
        ) {
            e.preventDefault();     // Prevent character input
        }
    }
});

jQuery("#no_of").keypress(function(event){
    //Allow only backspace and delete
    if (event.keyCode != 46 && event.keyCode != 8) {
        if (!parseInt(String.fromCharCode(event.which))) {
            event.preventDefault();
        }
    }
});

jQuery("#no_of").keyup(function(e){
    var temp_s= jQuery("#no_of").val();
    var multiply_val= temp_s*10;
    jQuery("#ex-r").html(multiply_val);
});

Check if decimal point already used:-

        // Stop: Multiple decimal points
        if((e.keyCode == 190 || e.keyCode == 110) && ((this.value).indexOf(".") >= 0))
            e.preventDefault(); 

$(document).ready(function()
{
    $("#textBoxId").bind("change",checkInput);
});

function checkInput()
{
    // check if $('#textBoxId').val() is under your constraints
    // then change its value, removing the last character
    // since this event will be called each time you
    // type a character
}

Not moving towards answer, i used accepted, but here is an implementation with some added logic to format the number in real time

https://gist.github.com/chrisallick/5560840

This answer was perfect, but we can even make it better and more powerful by combining it with the jQuery.Validation plugin.

By using the number() method, we can develop something like this:

$('.numberOnly').keydown(function (event) { 
  if ((!event.shiftKey && !event.ctrlKey && !event.altKey) && 
    ((event.keyCode >= 48 && event.keyCode <= 57) || (event.keyCode >= 96 && event.keyCode <= 105))) 
  // 0-9 or numpad 0-9, disallow shift, ctrl, and alt 
  { 
    // check textbox value now and tab over if necessary 
  } 
  else if (event.keyCode != 8 && event.keyCode != 13 && event.keyCode != 46 && event.keyCode != 37 
    && event.keyCode != 39 && event.keyCode != 9 && event.keyCode != 109 
    && event.keyCode != 189 && event.keyCode != 110 && event.keyCode != 190) 
  // not backsapce (8), enter (13), del (46), left arrow (37), right arrow (39), tab (9), negetive sign (- : 109, 189), or point (. : 110, 190) 
  { 
    event.preventDefault(); 
  } 
  // else the key should be handled normally 
}); 
// _____________________________________________
jQuery.validator.setDefaults({ 
  debug: true, 
  success: "valid" 
}); 
// _____________________________________________
$(document).ready(function(){ 
  $('#myFormId').validate({ 
    rules: { 
      field: { 
        required: true, 
        number: true 
      } 
    } 
  }); 
}); 

So, any Textbox in the "#myFormId" form, with "numberOnly" class, accept only number including decimal, float, and even negative number. Voila :)

PS: In my case, for some reason I used jQuery.validator.addMethod() instead of .validate():

jQuery.validator.addMethod("numberOnly", function (value, element) { 
var result = !isNaN(value); 
return this.optional(element) || result; 
}, jQuery.format("Please enter a valid number.")); 

(it works fine inside my ASP.NET MVC 3 project + unobtrusive JavaScript validation, hooooooooray!)

Refactored the accepted answer so that comments no longer need to used because I hate comments. Also this is easier to test with jasmine.

    allowBackspaceDeleteTabEscapeEnterPress: function(event){
    return ($.inArray(event.keyCode, [46, 8, 9, 27, 13, 190]) >= 0);
},
allowContorlAPress: function(event){
    return (event.keyCode == 65 && event.ctrlKey === true)
},
allowHomeEndLeftRightPress: function(event){
    return (event.keyCode >= 35 && event.keyCode <= 39)
},
theKeyPressedIsEditRelated: function (event) {
    return (this.allowBackspaceDeleteTabEscapeEnterPress(event)
            || this.allowContorlAPress(event)
            || this.allowHomeEndLeftRightPress(event));
},
isNotFromTheNumKeyPad: function (event) {
    return (event.keyCode < 96 || event.keyCode > 105);
},
isNotFromTopRowNumberKeys: function (event) {
    return (event.keyCode < 48 || event.keyCode > 57);
},
theKeyIsNonNumeric: function (event) {
   return (event.shiftKey
           || (this.isNotFromTopRowNumberKeys(event)
                && this.isNotFromTheNumKeyPad(event)));
},
bindInputValidator: function(){
    $('.myinputclassselector').keydown(function (event) {
        if(this.validateKeyPressEvent(event)) return false;
    });
},
validateKeyPressEvent: function(event){
    if(this.theKeyPressedIsEditRelated(event)){
        return;
    } else {
        if (this.theKeyIsNonNumeric(event)) {
            event.preventDefault();
        }
    }
}

add below code in document.ready

    $('.class of text box').keyup(function () 
    {
    this.value = this.value.replace(/[^0-9]/g, '');
    });  

Use below simple jQuery to allow only numeric characters in a tetbox. You do not need to filter all the special characters manually so there is no danger of missing some special char. This will allow only numbers 0-9: (Place below code in document ready and change the class name as per your numeric text fields class name.)

//Event of data being keyed in to textbox with class="numericField".
$(".numericField").keyup(function() {
    // Get the non Numeric char that was enetered
    var nonNumericChars = $(this).val().replace(/[0-9]/g, '');                                  
    // Now set the value in text box 
    $(this).val( $(this).val().replace(nonNumericChars, ''));    

});

I have combined all the answers in one and come up with the following code:

jQuery('#input_id', function(e){
    // Allow: backspace, delete, tab, escape, enter
    if (jQuery.inArray(e.keyCode, [46, 8, 9, 27, 13, 110]) !== -1 ||
        // Allow: Ctrl+A
        (e.keyCode === 65 && e.ctrlKey === true) ||
        // Allow: Ctrl+C
        (e.keyCode === 67 && e.ctrlKey === true) ||
        // Allow: Ctrl+X
        (e.keyCode === 88 && e.ctrlKey === true) ||
        // Disallow several dots (allow 190 only if no dots found)
        (e.keyCode === 190 && jQuery(this).val().indexOf('.') == -1) ||
        // Bug in some Android devices where it is always 229
        (e.keyCode === 229) ||
        // Allow: home, end, left, right
        (e.keyCode >= 35 && e.keyCode <= 40)) {
        // let it happen, don't do anything
        return;
    }
    // Ensure that it is a number and stop the keypress
    if ((e.shiftKey || (e.keyCode < 48 || e.keyCode > 57)) && (e.keyCode < 96 || e.keyCode > 105)) {
        e.preventDefault();
    }
});

In addition the form should have autocomplete="off". Without this option you might have issues with auto-complete algorithms on mobile devices.

put a class in input text and name it only_numbers

put the jquery code in the page

$(document).ready(function() {
    $('.only_numbers').keyup(function() {
        var numbers = $(this).val();
        $(this).val(numbers.replace(/\D/, ''));
    });
});

have fun :-)

Try this one

$('.plan_eff').keyup(function () {     
  this.value = this.value.replace(/[^1-9\.]/g,'');
});

function validate_profile(frmid) {
    var form = $('#' + frmid);
    var error = $('.alert-danger', form);
    var success = $('.alert-success', form);
    form.validate({
        errorElement: 'span', //default input error message container
        errorClass: 'help-block', // default input error message class
        focusInvalid: true, // do not focus the last invalid input
        ignore: "",
        rules: {
            contact_no: {
                required: true,
                minlength: 10,
                maxlength: 10,
                number: true
            }, email_id: {
                required: true,
                email: true
            }
        },
        invalidHandler: function (event, validator) { //display error alert on form submit   
            success.hide();
            error.show();
            Metronic.scrollTo(error, -7000);
        },
        highlight: function (element) { // hightlight error inputs
            $(element)
                    .closest('.form-group').addClass('has-error'); // un set error class to the control group
            $(element)
                    .closest('.form-group').removeClass('has-success'); // set success class to the control group
        },
        unhighlight: function (element) { // revert the change done by hightlight
            $(element)
                    .closest('.form-group').removeClass('has-error'); // un set error class to the control group
            $(element)
                    .closest('.form-group').addClass('has-success'); // set success class to the control group
            error.hide();
        },
        success: function (label) {
            label.closest('.form-group').removeClass('has-error');
            label.closest('.form-group').addClass('has-success');
        },
        submitHandler: function (form) {
            success.show();
            error.hide();
            form.submit();
        }
    });
}

function Numbers(e)
{
    if($.browser.msie)
    {
        if(e.keyCode > 47 && e.keyCode < 58)
            return true;
        else
            return false;
    }
    else
    {
        if((e.charCode > 47 && e.charCode < 58) || (e.charCode == 0))
            return true;
        else
            return false;
    }
}

I hope this will work on all browsers.