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();
        }
    });
}

你可以使用这个JavaScript函数:

function maskInput(e) {
    //check if we have "e" or "window.event" and use them as "event"
        //Firefox doesn't have window.event 
    var event = e || window.event 

    var key_code = event.keyCode;
    var oElement = e ? e.target : window.event.srcElement;
    if (!event.shiftKey && !event.ctrlKey && !event.altKey) {
        if ((key_code > 47 && key_code < 58) ||
            (key_code > 95 && key_code < 106)) {

            if (key_code > 95)
                 key_code -= (95-47);
            oElement.value = oElement.value;
        } else if(key_code == 8) {
            oElement.value = oElement.value;
        } else if(key_code != 9) {
            event.returnValue = false;
        }
    }
}

你可以像这样把它绑定到你的文本框:

$(document).ready(function() {
    $('#myTextbox').keydown(maskInput);
});

我在生产中使用了上面的方法，它工作得很好，而且是跨浏览器的。此外，它不依赖于jQuery，所以你可以用内联JavaScript将它绑定到你的文本框:

<input type="text" name="aNumberField" onkeydown="javascript:maskInput()"/>

这似乎牢不可破。

// Prevent NULL input and replace text.
$(document).on('change', 'input[type="number"]', function (event) {
    this.value = this.value.replace(/[^0-9\.]+/g, '');
    if (this.value < 1) this.value = 0;
});

// Block non-numeric chars.
$(document).on('keypress', 'input[type="number"]', function (event) {
    return (((event.which > 47) && (event.which < 58)) || (event.which == 13));
});

为了更详细地说明#3的答案，我将执行以下操作(注意:仍然不支持通过键盘或鼠标粘贴操作):

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

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;
    }
}

我希望这在所有浏览器上都能工作。

这就是我最近写这篇文章的原因。我知道这个问题已经有人回答了，但我把它留到以后使用。

该方法只允许0-9键盘和numpad，退格，制表符，左右箭头(正常形式操作)

$(".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();
    }
});