[英]javaScript multiply two numbers and show the result into third html input
[英]How do I add two numbers and them multiply it with the 3rd number and show the total in a disabled input in a html form with javascript?
This is the html code:
ID 是:num1、num2、num3 總輸入是“總計” 我希望計算 function 是 (num1+num2)*num3
<div class="row">
<div class="col">
<label> Tarif Colet</label>
<input type="num1" onfocus="calculare()" onkeyup="calculare()" onclick="calculare()" onblur="calculare()" value="0" id="tarifcolet" id="num1" class="form-control" placeholder="Tarif Colet">
</div>
<div class="col">
<label>Alte Taxe</label>
<input type="num2" value="0" onfocus="calculare()" onkeyup="calculare()" onclick="calculare()" onblur="calculare()" id="num2" class="form-control" placeholder="Alte Taxe">
</div>
<div class="col">
<label>Tva</label>
<input type="percent" name="num3" id="num3" value="19%" class="form-control" placeholder="TVA">
</div>
<div class="col">
<label>Total</label>
<input type="number" name="total" disabled="disabled" id="total" class="form-control" placeholder="total">
</div>
您可以使用您閱讀的相同屬性為禁用的輸入框分配一個值:
function calculare() {
var num1 = parseFloat(document.getElementById('num1').value);
var num2 = parseFloat(document.getElementById('num2').value);
var num3 = parseFloat(document.getElementById('num3').value);
document.getElementById("total").value = ((num1 + num2) * num3/100).toFixed(2);
}
在這里小提琴: https://jsfiddle.net/9s1d2nac/1/
(在小提琴中,我修復了您分配給第一個輸入的重復輸入,只留下“num1”作為 id。)
使用返回方法。
function myFunction(a, b, c) {
return (a+b)*c;
}
然后添加按鈕 onclick 事件(您也可以在其他事件中使用)。
<div class="row">
<div class="col">
<label> Tarif Colet</label>
<input type="num1" onfocus="calculare()" onkeyup="calculare()" onclick="calculare()" onblur="calculare()" value="0" id="tarifcolet" id="num1" class="form-control" placeholder="Tarif Colet">
</div>
<div class="col">
<label>Alte Taxe</label>
<input type="num2" value="0" onfocus="calculare()" onkeyup="calculare()" onclick="calculare()" onblur="calculare()" id="num2" class="form-control" placeholder="Alte Taxe">
</div>
<div class="col">
<label>Tva</label>
<input type="percent" name="num3" id="num3" value="19%" class="form-control" placeholder="TVA">
</div>
<div class="col">
<label>Total</label>
<input type="number" name="total" disabled="disabled" id="total" class="form-control" placeholder="total">
</div>
<button type="button" onclick="getValue() ">
function getValue(){
var num1 = document.getElementById("num1").value;
var num2 = document.getElementById("num2").value;
var num3 = document.getElementById("num3").value;
var displayResult = document.getElementById("total");
var result = myFunction(num1, num2, num3);
displayResult.value = result;
}
我希望這有效
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