Sum of two input value by jquery

Question

I have code    function compute         if     input name type  checked   val      undefined            var a      input name service price    val            var b      input name modem price    val            var total   a   b              total price   val a   b             In my code I want sum values of two text inputs and write in a text input that has an id of  total   My two numbers don t sum together for example    service price value   2000 and modem price 4000  in this example total input value must be 6000 but it is 20004000

User · Answer

if in multiple class you want to change additional operation in perticular class that show in below example       like   click function        var like    this  text      this  text  like    1

User · Answer

Your code is correct  except you are adding  concatenating  strings  not adding integers  Just change your code into   function compute         if      input name type  checked   val      undefined             var a   parseInt    input name service price    val             var b   parseInt    input name modem price    val             var total   a b              total price   val a b             and this should work   Here is some working example that updates the sum when the value when checkbox is checked  and if this is checked  the value is also updated when one of the fields is changed   jsfiddle

User · Answer

Because at least one value is a string the   operator is being interpreted as a string concatenation operator  The simplest fix for this is to indicate that you intend for the values to be interpreted as numbers   var total    a    b    and      total price   val  a    b     Or  better  just pull them out as numbers to begin with   var a       input name service price    val    var b       input name modem price    val    var total   a b      total price   val a b     See Mozilla s Unary   documentation   Note that this is only a good idea if you know the value is going to be a number anyway  If this is user input you must be more careful and probably want to use parseInt and other validation as other answers suggest

User · Answer

use parseInt as a   parseInt    input name service price    val

User · Answer

use parseInt     var total   parseInt a    parseInt b             total price   val total

User · Answer

x000D   x000D   lt script gt  x000D    document  ready function    x000D  var a  parseInt     a   val     x000D  var b  parseInt     b   val     x000D      submit   on  click  function    x000D  var sum   a   b  x000D  alert sum   x000D      x000D      x000D   lt  script gt  x000D   x000D   x000D

User · Answer

Cast them to a Number        total price   val Number a  Number b      But before you do that    if   isNaN    input name service price    val

[javascript] Sum of two input value by jquery

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