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How can I add form values ​​using javascript?

this is the code that I came up with, but all it does is 1 + 1 = 11, I need it to do 1 + 1 = 2.

<head> <script type="text/javascript"> function startCalc(){ interval = setInterval("calc()",1); } function calc(){ one = document.form1.quantity.value; two = document.form1.price.value; c = one + two document.form1.total.value = (c); } function stopCalc(){ clearInterval(interval); } </script> </head> <body> <form name="form1"> Quantity: <input name="quantity" id="quantity" size="10">Price: <input name="price" id="price" size="10"><br> Total: <input name="total" size="10" readonly=true><br> <input onclick="startCalc();" onmouseout="stopCalc()" type="button" value="Submit"> </form> </body>

Of course, this is a really simple form, but you get the idea, please help me tell you what I'm doing wrong here.

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5 answers

You need to use parseInt() to convert the string to an integer.

 c = parseInt(one, 10) + parseInt(two, 10)
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use this

 c = parseInt(one,10) + parseInt(two, 10);
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You need to convert the price values ​​to numeric.

use parseFloat for the price, since it can have decimal values.

use parseInt with a base.

e, g:

 function calc(){ one = parseInt(document.form1.quantity.value, 10); two = parseFloat(document.form1.price.value); c = one + two document.form1.total.value = (c); }
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You can use + to convert a string to a number (integer or floating)

 c = +one + +two;
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You can use this

  one = document.form1.quantity.value/1; two = document.form1.price.value/1;
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Source: https://habr.com/ru/post/1340736/

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