将输入字段限制为一个小数点和两个小数位

问题描述：

我有一个输入字段，限制为6个字符。如何验证我的输入字段，以便用户不能放置多个小数点（即19..12），加上它只能是两位小数（即19.123）？

I have an input field which is limited to 6 characters. How can I validate my input field so that a user can't put more than one decimal point (i.e. 19..12), plus it can only be to two decimal places as well (i.e. 19.123)?

这是我的输入字段

<input type="text" name="amount" id="amount" maxlength="6" autocomplete="off"/><span class="paymentalert" style="color:red;"></span>

这是我的验证脚本。

$(function(){
$("#amount").keypress( function(e) {
    var chr = String.fromCharCode(e.which);
    if (".1234567890NOABC".indexOf(chr) < 0)
        return false;
});
});

$("#amount").blur(function() {
    var amount = parseFloat($(this).val());
    if (amount) {
        if (amount < 40 || amount > 200) {
            $("span.paymentalert").html("Your payment must be between £40 and £200");
        } else {
            $("span.paymentalert").html("");
        }
    } else {
        $("span.paymentalert").html("Your payment must be a number");
    }
});

Jonah

答

这应该做：

var ok = /^\d*\.?\d{0,2}$/.test(input);

（如果我正确理解你不想在点之后超过2位数）

(if I correctly understood that you don't want more than 2 digits after the dot)

代码如下：

$("#amount").blur(function() {
    var input = $(this).val();
    if (/^\d*\.?\d{0,2}$/.test(input)) {
        var amount = parseFloat(input);
        if (amount < 40 || amount > 200) {
            $("span.paymentalert").html("Your payment must be between £40 and £200");
        } else {
            $("span.paymentalert").html("");
        }
    } else {
        $("span.paymentalert").html("Your payment must be a number");
    }
});

将输入字段限制为一个小数点和两个小数位

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