strange javascript error only when value =9 or 8

Question

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Workarounds for JavaScript parseInt octal bug

well i have this http://jsfiddle.net/gMDfk/1/ The alert returns 0 The code in jsfiddle works perfect when value is equal to eight or nine.. Wtf is going on here?

ok man, i will thing about this tip in my future questiions:P — Chris P, Dec 27 '11 at 20:44
Indeed. I used to ask people to do that, but now I just settle on the fact that the OP doesn't want future visitors to get any benefit from the Q&A; my interest falls apart after that realisation. — Lightness Races in Orbit, Dec 27 '11 at 20:44

score 7 · Accepted Answer · answered Dec 27 '11 at 20:39

7

add a , 10 to parseInt:

parseInt( val, 10 );

which tells JS to treat is as a base-10 number. By default, anything starting with 0 is treated as an octal, base-8 number. Since 09 isn't a valid base-8 number, you'll get 0

answered Dec 27 '11 at 20:39

2

Good answers contain explanations. 12.4k users know that! – Lightness Races in Orbit Dec 27 '11 at 20:41
3

Then you accidentally pressed "submit" _before_ you'd finished writing? – Lightness Races in Orbit Dec 27 '11 at 20:41
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No, I just decided to write more instead of leaving just the "do this" answer :) – Dec 27 '11 at 20:42
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@cwolves: Draft answers are discouraged. It's not a race! – Lightness Races in Orbit Dec 27 '11 at 20:45
@TomalakGeret'kal -- You've never looked at an answer and thought "I should type more..."? – Dec 27 '11 at 20:46
@cwolves: I've never written such a non-answer in the first place ;) – Lightness Races in Orbit Dec 27 '11 at 20:46
pfft. My first line alone is sufficient enough an answer in this case -- people need to learn to look up answers sometimes, and that tells them exactly what to look up :) – Dec 27 '11 at 20:47

score 2 · Answer 2 · answered Dec 27 '11 at 20:40

Prefixing a number with a 0 means it's interpreted as octal by javascript. Try this:

alert(parseInt("010")); //shows "8"

You can fix it by passing 10 as a second param to parseInt, this lets it know you want it parsed in decimal.

alert(parseInt("010", 10)); //shows "10"

score 1 · Answer 3 · answered Dec 27 '11 at 20:40

1

Parseint should use radix parameter: parseint (value, radix). In your case, radix is 10. Otherwise, it will take it as octal.

answered Dec 27 '11 at 20:40

Alfabravo

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score 0 · Answer 4 · answered Dec 27 '11 at 20:43

0

specify the base

parseInt(some_id_value,10);

answered Dec 27 '11 at 20:43

Deept Raghav

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strange javascript error only when value =9 or 8

4 Answers4