计算使用具有千位分隔符格式的 key up 函数

Question

我想在用户键入时进行计算，结果将显示在其他字段中。带有千位分隔符的格式编号，如 2,500.00

所以如果我对 2,500.00 + 2,500.00 求和，结果必须是 5,000.00

但我的代码显示 4.00

function isNumberKey(evt) {
  var theEvent = evt || window.event;
  var key = theEvent.keyCode || theEvent.which;
  key = String.fromCharCode(key);
  if (key.length == 0) return;
  var regex = /^[0-9.,\b]+$/;
  if (!regex.test(key)) {
    theEvent.returnValue = false;
    if (theEvent.preventDefault) theEvent.preventDefault();
  }
}

function toFloat(z) {
  var x = document.getElementById(z);
  x.value = parseFloat(x.value).toFixed(2).replace(/\d(?=(\d{3})+\.)/g, '$&,');
}

$( ".fn" ).keyup(function() {
 var nmi = $('#nmi').val();
  var a = $('#a').val();

  var total = parseFloat(nmi) + parseFloat(a);
  $("#total").val(parseFloat(total).toFixed(2).replace(/\d(?=(\d{3})+\.)/g, '$&,'));
});

<script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/3.3.1/jquery.min.js"></script>
<input onchange="toFloat('nmi')" type="text" maxlength="10" onkeypress="return isNumberKey(event)" required="required" class="form-control fn" placeholder="RM" name="nmi" id="nmi">

<input onchange="toFloat('a')" type="text" maxlength="10" onkeypress="return isNumberKey(event)" required="required" class="form-control fn" placeholder="RM" name="a" id="a">
<br> total
<input onchange="toFloat('total')" type="text" maxlength="10" onkeypress="return isNumberKey(event)" required="required" class="form-control fn" placeholder="RM" name="total" id="total">

Answer 1

当parseFloat('2,500.00')会return 2 因为,.

parseFloat: parses its argument, and returns a floating point number. If it encounters a character other than a sign (+ or -), numeral (0-9), a decimal point, or an exponent, it returns the value up to that point and ignores that character and all succeeding characters

使用 replace()

从值中删除 ,

function isNumberKey(evt) {
  var theEvent = evt || window.event;
  var key = theEvent.keyCode || theEvent.which;
  key = String.fromCharCode(key);
  if (key.length == 0) return;
  var regex = /^[0-9.,\b]+$/;
  if (!regex.test(key)) {
    theEvent.returnValue = false;
    if (theEvent.preventDefault) theEvent.preventDefault();
  }
}

function toFloat(z) {
  var x = document.getElementById(z);
  x.value = parseFloat(x.value).toFixed(2).replace(/\d(?=(\d{3})+\.)/g, '$&,');
}
$( ".fn" ).keyup(function() {
 var nmi = $('#nmi').val().replace(/,/g,'');
 
  var a = $('#a').val().replace(/,/g,'');

  var total = parseFloat(nmi) + parseFloat(a);
  $("#total").val(parseFloat(total).toFixed(2).replace(/\d(?=(\d{3})+\.)/g, '$&,'));
});

<script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/3.3.1/jquery.min.js"></script>
<input onchange="toFloat('nmi')" type="text" maxlength="10" onkeypress="return isNumberKey(event)" required="required" class="form-control fn" placeholder="RM" name="nmi" id="nmi">

<input onchange="toFloat('a')" type="text" maxlength="10" onkeypress="return isNumberKey(event)" required="required" class="form-control fn" placeholder="RM" name="a" id="a">
<br> total
<input onchange="toFloat('total')" type="text" maxlength="10" onkeypress="return isNumberKey(event)" required="required" class="form-control fn" placeholder="RM" name="total" id="total">

Answer 2

您的代码更改很简单。

$(document).ready(function() {
  $('.fn').on('input', function() {
    this.value = this.value.match(/^\d+\.?\d{0,2}/);
    calculate();
  });
});

function calculate() {
  var t = 0;
  nmi = ($("#nmi").val() ? parseFloat($("#nmi").val()) : 0);
  a = ($("#a").val() ? parseFloat($("#a").val()) : 0);
  $("#total").val(nmi + a);
}

<script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/3.3.1/jquery.min.js"></script>
<input type="text" maxlength="10" required="required" class="form-control fn" placeholder="RM" name="nmi" id="nmi">

<input type="text" maxlength="10" required="required" class="form-control fn" placeholder="RM" name="a" id="a">
<br> total
<input type="text" maxlength="10" required="required" class="form-control fn" placeholder="RM" name="total" id="total">

Answer 3

让我们试试这个，，，对我有用 "Dial Gtg"

$('input.CurrencyInput').on('blur', function() {
  const value = this.value.replace(/,/g, '');
  this.value = parseFloat(value).toLocaleString('en-US', {
    style: 'decimal',
    maximumFractionDigits: 2,
    minimumFractionDigits: 2
  });
});

$('input.CurrencyInput2').on('blur', function() {
  const value = this.value.replace(/,/g, '');
  this.value = parseFloat(value).toLocaleString('en-US', {
    style: 'decimal',
    maximumFractionDigits: 2,
    minimumFractionDigits: 2
  });
});


$( ".fn" ).keyup(function() {
 var a = $('#a').val().replace(/,/g,'');
 
  var b = $('#b').val().replace(/,/g,'');

  var total = parseFloat(a) + parseFloat(b);
  $("#total_nya").val(parseFloat(total).toFixed(2).replace(/\d(?=(\d{3})+\.)/g, '$&,'));
});

<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
<input class="CurrencyInput fn" id="a">

<input class="CurrencyInput2 fn" id="b">

<input class="total_nya" id="total_nya">

计算使用具有千位分隔符格式的 key up 函数

Calculation use key up function with a thousand separator format

javascript

php

jquery

sum

keyup