Check if object exist

[Mateo]

Hi!

Let's say that I have generated var SomeVariable = true; from server.
On client side I have:
if (SomeVariable == true) {
do something
}

How could I first check if my variable is undefined? Or how can I say if
some exception occures please don't report error, just continiue?
If variable is not generated from server, it will report me an error....


Thanx guys!

 

[RobG]

Hi!

Let's say that I have generated var SomeVariable = true; from server.
On client side I have:
if (SomeVariable == true) {
do something

}

How could I first check if my variable is undefined?

if (typeof someVariable != 'undefined')
{
// someVariable is not undefined, but
// might be null, or false, or whatever...
}

But if you are expecting it to be boolean true, why not:

if (someVariable) ...

 

[Mateo]

if (typeof someVariable != 'undefined')
{
// someVariable is not undefined, but
// might be null, or false, or whatever...
}

thank u, this works fine....

But if you are expecting it to be boolean true, why not:

this produces error to...

 

[Mateo]

thank you, your solution works fine too... this looks like old browsers
compatibile....