Search code examples
jqueryhtmlkeyuprate

jquery: percentage of two numbers

EDITED

Thank you for everyone who offered support... the best working script I will share with you in hope that I could help others who is looking for the same solution:

    $(document).ready(function(){
$("#price1, #price2").keyup(function() {
  var priceOne = parseFloat($("#price1").val());
  var priceTwo = parseFloat($("#price2").val());
  var rate = parseFloat($("#rate").val());
  if ($("#price1").val() && $("#price2").val()){     
  $('#rate').val(((priceTwo - priceOne) / priceOne * 100).toFixed(2));
}

});

$("#rate").keyup(function() {
  var priceOne = parseFloat($("#price1").val());
  var rate = parseFloat($("#rate").val());

   if ($("#rate").val() && $("#price1").val() && $("#price2").val()){
 $('#price2').val(((priceOne * rate)/ 100 + priceOne).toFixed(2));
}
});
})

Also you can test it following this LINK

INITIAL QUESTION:

Please help to calculate the percentage between two numbers. I tried one way, but I did not succeed. Please tell me what is wrong, or I will appreciate if you can recommend other script which could help me

my script:

<html>
<head>
 <script type="text/javascript">
$("#rate").text(function() {
    var result = (parseInt(($("#price1").text(), 10) * 100)/ parseInt($("#price2").text(), 10));
    if (!isFinite(result)) result = 0;
    return result;
});?
</script> 

</head>
<body>
<div id="price1"><label><input id="price1" type="text"></label></div>
<div id="price2"><label><input id="price2" type="text"></label></div>
<div id="rate"><label><input id="rate" type="text"></label></div>


</body>
</html>
Solution

  • use val() instead of text() for input element, use $(function(){}) to wait DOM is ready. And also don't use same ID to elements.

    <html>
<head>
<script src="https://ajax.googleapis.com/ajax/libs/jquery/1.7.2/jquery.min.js"></script>
<script type="text/javascript">
$(function() {
  $("#price1, #price2").change(function() { // input on change
    var result = parseFloat(parseInt($("#price1").val(), 10) * 100)/ parseInt($("#price2").val(), 10);
    $('#rate').val(result||''); //shows value in "#rate"
  })
});
</script> 
</head>
<body>
<div id="price-div1"><label>price1</label><input id="price1" type="text"></div>
<div id="price-div2"><label>price2</label><input id="price2" type="text"></div>
<div id="rate-div"><label>rate</label><input id="rate" type="text">%</div>
</body>
</html>