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Javascript String to Int

12 Comments »

• dav7

  Wow, thanks for that. First hit in Google and exact result to my problem (“start = parseInt(document.getElementById(‘text’).value);”).

  My function was returning an array with missing values when I tried to access `start – 1′ but as soon as I parseInt’ed it all was well \o/

  -dav7

  Comment | May 20, 2007
• Scott

  Perfect, thanks! I was lamenting having to use eval(), so this is perfect!

  Comment | May 20, 2007
• Airor

  Instead I use the built in typecasting
  myInt = 0 + str;
  myStr = ” + i + ‘ number of things.’;

  Comment | October 5, 2007
• Leonardo

  Nice one,
  tkx

  Comment | January 22, 2008
• johnsmith

  Ja pierdole ale niemoc pisać tak zjebane artykuły.

  Nice

  Comment | July 10, 2008
• norma savage

  thanks!
  

  Comment | July 15, 2008
• Barnaby

  haha, to jest całkiem bez sensu artykuł

  Pretty cool, thanks

  Comment | September 13, 2008
• Luong Xuan Thuy

  ———————————–
  var yourInt;
  yourInt = parseInt(str);
  ———————————–

  You can not use this code fragment if your string is “009″. parseInt(“099″)=0;
  Because “000″ not is a octal digits.

  Thanks.

  Comment | September 26, 2008
• Luong Xuan Thuy

  Sorry, I mean : Because “099″ not is a octal digits.

  Comment | September 26, 2008
• Istvan

  You should always explicitly specify the radix to be safe:

  var yourInt;

  yourInt = parseInt(str,10);

  In this case you won’t have problems with strings that can be interpreted as octal numbers.

  From the javascript specification:

  If the radix parameter is omitted, JavaScript assumes the following:

  If the string begins with “0x”, the radix is 16 (hexadecimal)

  If the string begins with “0″, the radix is 8 (octal). This feature is deprecated

  If the string begins with any other value, the radix is 10 (decimal)

  Not all browsers implement the specification in the same way, so if you want your code to work consistently everywhere you shouldn’t omit the radix.

  Comment | October 23, 2008
• brandonh

  thank you so much lstvan. i was kicking myself trying to see why 08 was returning 0. you rule.

  Comment | November 22, 2008
• I&Mdesign

  Thanks a lot for your explanation about hexadecimal and octal numbers espesially. It works!

  Comment | December 4, 2008

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