将输入字段限制为一个小数点和两个小数位 [英] Limiting input field to one decimal point and two decimal places
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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 {
$("span.paymentalert").html("Your payment must be a number");
}
});
Jonah
推荐答案
这应该做:
var ok = /^\d*\.?\d{0,2}$/.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");
}
});
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