Converting string to number in javascript jQuery

Question

Been trying to convert the following to number    lt button class  btn btn-large btn-info  data-votevalue  1  gt       lt strong gt 1 lt  strong gt   lt  button gt    var votevalue   parseInt   this  data  votevalue       I ve also tried Number   but I m still getting NaN when checking the result  What am I doing wrong   Here is the complete code    lt div class  span7  id  button-group  gt       lt div class  btn-group  gt           lt button class  btn btn-large btn-info  data-votevalue  1  gt  lt strong gt 1 lt  strong gt  lt  button gt           lt button class  btn btn-large btn-info  data-votevalue  2  gt  lt strong gt 2 lt  strong gt  lt  button gt           lt button class  btn btn-large btn-info  data-votevalue  3  gt  lt strong gt 3 lt  strong gt  lt  button gt           lt button class  btn btn-large btn-info  data-votevalue  4  gt  lt strong gt 4 lt  strong gt  lt  button gt           lt button class  btn btn-large btn-info  data-votevalue  5  gt  lt strong gt 5 lt  strong gt  lt  button gt           lt button class  btn btn-large btn-info  data-votevalue  6  gt  lt strong gt 6 lt  strong gt  lt  button gt           lt button class  btn btn-large btn-info  data-votevalue  7  gt  lt strong gt 7 lt  strong gt  lt  button gt           lt button class  btn btn-large btn-info  data-votevalue  8  gt  lt strong gt 8 lt  strong gt  lt  button gt           lt button class  btn btn-large btn-info  data-votevalue  9  gt  lt strong gt 9 lt  strong gt  lt  button gt           lt button class  btn btn-large btn-info  data-votevalue  10  gt  lt strong gt 10 lt  strong gt  lt  button gt       lt  div gt   lt  div gt        button-group button   each function           this  click function               this  addClass  active            var votevalue   parseInt   this  data  votevalue             var filename       mainimage   data  filename            var votes   parseInt     mainimage   data  numvotes             var totalscore   parseInt     mainimage   data  totalscore               ajax               type   POST               url   index php  category vote               data                     votevalue   votevalue                   filename   filename                            success  function                     votes                    alert votes                   var average     totalscore   votevalue    votes                       vote-incremenet   html votes                       display-average   html average                       display-average   show                        button-group button   each function                          this  unbind  click                                                     end ajax            end click        end each

User · Answer

It sounds like this is referring to something else than you think  In what context are you using it   The this keyword is usually only used within a callback function of an event-handler  when you loop over a set of elements  or similar  In that context it refers to a particular DOM-element  and can be used the way you do   If you only want to access that particular button  outside any callback or loop  and don t have any other elements that use the btn-info class  you could do something like   parseInt     btn-info   data  votevalue    10     You could also assign the element an ID  and use that to select on  which is probably a safer way  if you want to be sure that only one element match your selector

User · Answer

It sounds like this in your code is not referring to your  btn element  Try referencing it explicitly with a selector   var votevalue   parseInt     btn   data  votevalue    10     Also  don t forget the radix

User · Answer

var votevalue     map   this  data  votevalue    Number

User · Answer

For your case  just use   var votevalue      this  data  votevalue      There are some ways to convert string to number in javascript   The best way   var str    1   var num    str    simple enough and work with both int and float   You also can   var str    1   var num   Number str     without new  work with both int and float   or  var str    1   var num   parseInt str 10     for integer number var num   parseFloat str     for float number   DON T   var str    1   var num   new Number str      num will be an object  typeof num     object    Use parseInt only for special case  for example  var str    ff   var num   parseInt str 16     255  var str    0xff   var num   parseInt str     255

User · Answer

You should just use     before   this   That s going to convert the string to number  so   var votevalue      this  data  votevalue      Oh and I recommend to use closest   method just in case      var votevalue      this  closest   btn-group   data  votevalue

User · Answer

Although this is an old post  I thought that a simple function can make the code more readable and keeps with jQuery chaining code-style   String prototype toNum   function        return parseInt this  10       can be used with jQuery   var padding top       some div   css  padding-top      string   10px  var padding top       some div   css  padding-top   toNum      number  10    or with any String object    123  toNum      123  number

User · Answer

You can use parseInt string  radix  to convert string value to integer like this code below  var votevalue   parseInt    button   data  votevalue         DEMO

User · Answer

You can adding a   before the string without using parseInt and parseFloat and radix  Simply  sample   var votevalue       button   data  votevalue     alert typeof votevalue

User · Answer

var string   123  is string    parseInt parameter is string    var string    123    var int  parseInt string     console log int      Output will be 123

[javascript] Converting string to number in javascript/jQuery

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