JSFiddle - React, Tailwind, and code Playground
by Kishan Patel
HTML
<link rel="stylesheet" href="https://cdnjs.cloudflare.com/ajax/libs/twitter-bootstrap/3.3.7/css/bootstrap.min.css">
<script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/3.2.1/jquery.min.js"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/twitter-bootstrap/3.3.7/js/bootstrap.min.js"></script>
<form class="form-horizontal">
<div class="form-group">
<label class="control-label col-md-2 col-xs-2" for="batch">2000</label>
<div class="col-md-1 col-xs-4 mul_by">
<span>x </span> <input type="text" class="form-control">
</div>
<div class="col-md-3 col-xs-5 mul_val">
<span style="font-size: 18px;">= </span> <input type="text" class="form-control">
</div>
</div>
<div class="form-group">
<label class="control-label col-md-2 col-xs-2" for="batch">500</label>
<div class="col-md-1 col-xs-4 mul_by">
<span>x </span> <input type="text" class="form-control">
</div>
<div class="col-md-3 col-xs-5 mul_val">
<span style="font-size: 18px;">= </span> <input type="text" class="form-control">
</div>
</div>
<div class="form-group">
<label class="control-label col-md-2 col-xs-2" for="batch">100</label>
<div class="col-md-1 col-xs-4 mul_by">
<span>x </span> <input type="text" class="form-control">
</div>
<div class="col-md-3 col-xs-5 mul_val">
<span style="font-size: 18px;">= </span> <input type="text" class="form-control">
</div>
</div>
<div class="form-group">
<hr>
<label class="control-label col-md-2 col-xs-2" for="batch">total:</label>
<div class="col-md-3 col-xs-5 mul_val">
<span style="font-size: 18px;">= </span> <input type="text" class="form-control total">
</div>
</div>
</form>JavaScript
$(document).ready(function () {
$('.mul_by').each(function (i) {
var _this = $(this),
//set default input value to zero inside .mul-by div
setZero = _this.find('.form-control').val(0),
//set default input value to zero inside .mul-val div
setDenominationVal = _this.siblings('.mul_val').find('.form-control').val(0),
//set default input value to zero inside .total div
setTotalVal = $('.total').val(0);
setZero.on('change', function () {
//watch and store input val. inside .mul_by
var getUpdatedVal = _this.find('.form-control').val(),
//get label text
getDenominationVal = parseInt(_this.siblings('label').text()),
//update mul_by div after multiplication
updateDenominationVal = _this.siblings('.mul_val').find('.form-control');
if(getUpdatedVal > 0){
var vals = updateDenominationVal.val(getUpdatedVal * getDenominationVal);
total = parseInt(setTotalVal.val()) + parseInt(vals.val());
setTotalVal.val(total);
} else{
updateDenominationVal.val(0);
}
});
});
});