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How to use an empty String ?

lepierrotlepierrot Members
edited November -1 in Sahi - Open Source
Hi,

I have a String in my program that is setable by the user. I'd like to do a specific action if this string is empty, but how do I use it ?

$string = "192.168.155.4"; // this is setable by the user

if(_condition( $string != null)){
_click(_link(...));
}

So, if $string exists I want to do some specific action...And if it soesn't exist, I want to do nothing. But I dunno how to use the fact that the string is empty . Is it with " " or 'null' or 'undefined' ? And how the user lust set $string to make possible the use of the emptiness..

Any ideas ?
:)

Comments

  • pankaj.nithpankaj.nith Members
    Hi,

    An empty string means "".
    i.e $string = "";
    If you talk about a string that does not exist, it is undefined.

    Regards,
    Pankaj.
  • lepierrotlepierrot Members
    Ok, so :
    var $ip2start="";

for($i=0; $i<5; $i++){

  if(_condition($ip2start == "")){
    $k = _random ( 253 ) + 1;
    $ipaddress2[$i] = $ip2start + $k;
  }

}
    should work...?

    ( don't pay attention to the meaning of the code, it's a snippet of a bigger one and it does not have meanings ...!)
  • pankaj.nithpankaj.nith Members
    Hi,

    This should work :)

    Pankaj.
  • lepierrotlepierrot Members
    Yes but it doesn't ...

    _saveCondition("" == "");
    _saveCondition("" == "");
    _saveCondition("" == "");
    _saveCondition("" == "");

    ... :)
  • pankaj.nithpankaj.nith Members
    Hi,

    Check the source code of your application and see what is the value of $ip2start when the string is empty.
    It may be the case that when it has no value it may not be present in the code at all. in that case you will have to use null in place of "".

    Regards,
    Pankaj.
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