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12-09-2011, 07:43 PM #1
- Join Date
- Dec 2011
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Can someone help me to understand this code?
I have seen this code-piece different places - to use to make a webpage redirect if it is a mobilephone.
I don't quit understand the code - especially the line:
if (redirectagent.indexOf(redirect_devices[i]) != -1)
- why -1 ? Please help me - I would be so thankful.
Last edited by VIPStephan; 12-10-2011 at 02:20 AM. Reason: fixed code BB tag
12-10-2011, 03:13 AM #2
The indexOf method returns -1 if the text you are searching for is *NOT* found.
So by saying
!= -1that is really saying "if the given text is found anywhere in the string...".
It's kind of weird coding. If the useragent string contained, for example, "mot" at *ANY* place in the string (e.g., "Mosilla FireFox with remote scripting support") then it will count as "found".An optimist sees the glass as half full.
A pessimist sees the glass as half empty.
A realist drinks it no matter how much there is.
12-10-2011, 06:20 AM #3
why -1 ?
Negative One condition check
LTAsk not what can I do for myself, but what can I do for others
"The greatest revenge is to accomplish what others say you cannot do."
I used to be indecisive, but now I'm not so sure.