这是我用来验证整数或浮点值的数字输入(不显眼的jQuery风格):

$('input[name="number"]').keyup(function(e) { var float = parseFloat($(this).attr('data-float')); /* 2 regexp for validating integer and float inputs ***** > integer_regexp : allow numbers, but do not allow leading zeros > float_regexp : allow numbers + only one dot sign (and only in the middle of the string), but do not allow leading zeros in the integer part *************************************************************************/ var integer_regexp = (/[^0-9]|^0+(?!$)/g); var float_regexp = (/[^0-9\.]|^\.+(?!$)|^0+(?=[0-9]+)|\.(?=\.|.+\.)/g); var regexp = (float % 1 === 0) ? integer_regexp : float_regexp; if (regexp.test(this.value)) { this.value = this.value.replace(regexp, ''); } }); <script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script> <input type="text" data-float="1" id="number" name="number" placeholder="integer"> <input type="text" data-float="0.1" id="number" name="number" placeholder="float">

检查输入值是否为数字的简单方法是:

var checknumber = $('#textbox_id').val();

    if(jQuery.isNumeric(checknumber) == false){
        alert('Please enter numeric value');
        $('#special_price').focus();
        return;
    }

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));
});

在document.ready中添加以下代码

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

这将在添加非数字字符时保持先前的值。

$(document).on('input', '.digit-input', function() {
    var prevVal = $(this).attr('ov') ? $(this).attr('ov') : '';
    var newVal = this.value.replace(/[^0-9]/g, '');
    this.value = newVal != '' ? newVal : prevVal;
    $(this).attr('ov', this.value);
});

$(文件)。据(’input’'。digit-input'，函数(){ var prevVal = $(this).attr('ov') ?$(this).attr('ov'): "; var newVal = this.value。回想起(^ [0 - 9]/ g '); this。= = " ? "newVal: prevVal; $ (this)。attr(’ov’this.value); }); < script " src = " https://cdnjs.cloudflare.com/ajax/libs/jquery/3.3.1/jquery.min.js " > / < script > <input type="text" class=" digital -input">

下面是一个使用jQuery UI小部件工厂的答案。您可以轻松地自定义允许的字符。

$('input').numberOnly({
    valid: "0123456789+-.$,"
});

这将允许数字、数字符号和美元金额。

$.widget('themex.numberOnly', {
    options: {
        valid : "0123456789",
        allow : [46,8,9,27,13,35,39],
        ctrl : [65],
        alt : [],
        extra : []
    },
    _create: function() {
        var self = this;

        self.element.keypress(function(event){
            if(self._codeInArray(event,self.options.allow) || self._codeInArray(event,self.options.extra))
            {
                return;
            }
            if(event.ctrlKey && self._codeInArray(event,self.options.ctrl))
            {
                return;
            }
            if(event.altKey && self._codeInArray(event,self.options.alt))
            {
                return;
            }
            if(!event.shiftKey && !event.altKey && !event.ctrlKey)
            {
                if(self.options.valid.indexOf(String.fromCharCode(event.keyCode)) != -1)
                {
                    return;
                }
            }
            event.preventDefault(); 
        });
    },

    _codeInArray : function(event,codes) {
        for(code in codes)
        {
            if(event.keyCode == codes[code])
            {
                return true;
            }
        }
        return false;
    }
});