Created
March 7, 2018 00:50
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loancalc
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<script src="https://code.jquery.com/jquery-3.2.1.min.js"></script> | |
<script type="text/javascript"> | |
function calcPayment(loan, termRate, numberOfTerms, loanType, count){ | |
if (count < 1) return 0; | |
if (loanType == "payment_equal") { | |
return calcPaymentEqual(loan, termRate, numberOfTerms) * count; | |
}else{ | |
return calcPrincipalEqual(loan, termRate, numberOfTerms) | |
+ calcPayment(loan * (numberOfTerms - 1) / numberOfTerms, termRate, numberOfTerms - 1, loanType, count - 1); | |
} | |
} | |
function calcPaymentEqual(loan, termRate, numberOfTerms){ | |
return Math.floor( | |
loan * termRate * Math.pow(1 + termRate, numberOfTerms) | |
/ (Math.pow(1 + termRate, numberOfTerms) - 1) | |
); | |
} | |
function calcPrincipalEqual(loan, termRate, numberOfTerms){ | |
return Math.floor( | |
(loan / numberOfTerms) + loan * termRate | |
); | |
} | |
function calc (){ | |
function isInteger(val) { | |
return $.isNumeric(val) && (val % 1 == 0); | |
} | |
$("#error_message").html(""); | |
$("#monthly_payment").html(""); | |
$("#bounus_payment").html(""); | |
$("#annual_payment").html(""); | |
$("#total_payment").html(""); | |
if (isInteger($("input[name=loan]").val()) == false) { | |
$("#error_message").html("借入額は整数を入力してください。"); | |
} | |
if ($("input[name=loan]").val() < 1) { | |
$("#error_message").html("借入額は1万円以上を入力してください。"); | |
} | |
if ($("input[name=bounus_payment]").val() == "") $("input[name=bounus_payment]").val(0); | |
if (isInteger($("input[name=bounus_payment]").val()) == false) { | |
$("#error_message").html("ボーナス支払い額は整数を入力してください。"); | |
} | |
if ($("input[name=bounus_payment]").val() < 0) { | |
$("#error_message").html("ボーナス支払い額は0円以上を入力してください。"); | |
} | |
if (isInteger($("input[name=priod]").val()) == false) { | |
$("#error_message").html("支払い年数は整数を入力してください。"); | |
} | |
if ($("input[name=priod]").val() <= 1 ) { | |
$("#error_message").html("支払い年数は1年以上を入力してください。"); | |
} | |
if ($.isNumeric($("input[name=rate]").val()) == false) { | |
$("#error_message").html("利率は数値を入力してください。"); | |
} | |
if ($("input[name=rate]").val() <= 0 || 15 <= $("input[name=rate]").val()) { | |
$("#error_message").html("利率額は0%より大きく~15%より小さい値を入力してください。"); | |
} | |
loan = parseInt($("input[name=loan]").val()) * 10000; | |
bounusloan = parseInt($("input[name=bounus_payment]").val()) * 2 * parseInt($("input[name=priod]").val()) * 10000; | |
rate = parseFloat($("input[name=rate]").val()) / 100; | |
priod = parseInt($("input[name=priod]").val()); | |
type = $("input[name=loan_type]:checked").val(); | |
if(loan < bounusloan){ | |
$("#error_message").html("ボーナス支払い額が借入に対して大きすぎます。"); | |
} | |
if ($("#error_message").html() != "") return; | |
$("#monthly_payment").html(calcPayment(loan - bounusloan, rate / 12, priod * 12, type, 1)); | |
$("#bounus_payment").html(calcPayment(bounusloan, rate / 2, priod * 2, type, 1)); | |
$("#annual_payment").html( | |
calcPayment(loan - bounusloan, rate / 12, priod * 12, type, 12) | |
+ calcPayment(bounusloan, rate / 2, priod * 2, type, 2)); | |
$("#total_payment").html( | |
calcPayment(loan - bounusloan, rate / 12, priod * 12, type, priod * 12) | |
+ calcPayment(bounusloan, rate / 2, priod * 2, type, priod * 2)); | |
} | |
</script> | |
<div id="loan_simulater"> | |
<div>借入額 | |
<input type="text" name="loan"> | |
万円 | |
</div> | |
<div>ボーナス支払い額(年2回) | |
<input type="text" name="bounus_payment"> | |
万円 | |
</div> | |
<div>支払い年数 | |
<input type="text" name="priod"> | |
年 | |
</div> | |
<div>利率 | |
<input type="text" name="rate"> | |
% | |
</div> | |
<div>元利均等返済 | |
<input type="radio" name="loan_type" value="payment_equal" checked=""> | |
</div> | |
<div>元本均等返済 | |
<input type="radio" name="loan_type" value="principal_equal"> | |
</div> | |
<div id="error_message" style="color:red" ></div> | |
<div> | |
<input type="button" name="calc" onclick="calc()" value="計算"> | |
</div> | |
<div>返済額 | |
<div id="monthly_payment" >0</div> | |
円(元本一括払いのとき1回目の支払い金額) | |
</div> | |
<div>ボーナス払い | |
<div id="bounus_payment" >0</div> | |
円(元本一括払いのとき1回目の支払い金額) | |
</div> | |
<div>年間返済額 | |
<div id="annual_payment" >0</div> | |
円 | |
</div> | |
<div>総返済額 | |
<div id="total_payment" >0</div> | |
円 | |
</div> | |
</div> | |
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