jquery - Cannot add two numbers correctly without using parseFloat in JavaScript -
i came across problem. adding numbers using parsefloat or parseint. if textbox1 value 4 , textbox2 value 2 got output (see script)
my doubt why in addition alone
parsefloat($('#txt1').val()) + parsefloat($('#txt2').val())
gives correct value
parsefloat($('#txt1').val() + $('#txt2').val())
is not giving correct value whereas
parsefloat($('#txt1').val() - $('#txt2').val()),parsefloat($('#txt1').val() / $('#txt2').val()),parsefloat($('#txt1').val() * $('#txt2').val())
are giving correct value. simple couldn't find solution.
=====jquery
function calculate() { //--> output $('#lbl1').html(parsefloat($('#txt1').val() + $('#txt2').val())); //--> 42 $('#lbl2').html(parsefloat($('#txt1').val()) + parsefloat($('#txt2').val())); //--> 6 $('#lbl3').html(parsefloat(4 + 2)); //--> 6 $('#lbl4').html(parsefloat($('#txt1').val() - $('#txt2').val())); //--> 2 $('#lbl5').html(parsefloat($('#txt1').val() * $('#txt2').val())); //--> 8 $('#lbl6').html(parsefloat($('#txt1').val() / $('#txt2').val())); //--> 2 } =====html
<table> <tr> <td> <input type="text" id="txt1" /> </td> <td> <input type="text" id="txt2" /> </td> </tr> <tr> <td> <input type="button" value="calculate" onclick="calculate()" /> </td> <td> <label id="lbl1"> </label> | <label id="lbl2"> </label> | <label id="lbl3"> </label> | <label id="lbl4"> </label> | <label id="lbl5"> </label> | <label id="lbl6"> </label> </td> </tr> </table>
$.val() returns string value.
so in first example convert both returned strings numbers , calculation fine.
if use parsefloat($('#txt1').val() + $('#txt2').val()) + not work arithmetic operator, string concatenation. concatenate both strings , convert them afterwards, gives wrong result.
the examples using - work, there no string operation using - , alls values implicitly converted number before operation applied.
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