Global Variable In A Function

[SamMan]

I have a .js file that receives a value from an html page. I'd like this
value to be a global variable that all functions in the .js file can use. I
have tried just declaring a var at the top of my .js file, but when the
value comes into the function and gets assigned to that variable, it is not
global.

Any help, hints, etc. would be appreciated.

Thanks,
Sam

 

[Jérôme VUIBERT]

Strange it works for me but the global variable is in the <script> part of
the html document.

jerome

 

[SamMan]

What I'm trying to do is to pass a value from "first.html" to a function in
the .js file (works fine). This value should get assigned to a global
variable (not working) and within the same function, a new window is opened.
"second.html". This second pop-up window then calls (onLoad) another
function within the same .js file and writes the value of the global
variable to the page.

Thanks,
Sam

 

[Martin Honnen]

I have a .js file that receives a value from an html page. I'd like this
value to be a global variable that all functions in the .js file can use. I
have tried just declaring a var at the top of my .js file, but when the
value comes into the function and gets assigned to that variable, it is not
global.

If you declare
var varName;
outside of any function then you have declared a global variable which
you can then use as
varName = expression

 

[SamMan]

If you declare
var varName;
outside of any function then you have declared a global variable which
you can then use as
varName = expression

Thanks Martin,

I'm aware of what you are saying, but the problem I'm having is that unless
I initialize the var (var varName = "someValue"), the variable remains null,
or undefined. In the code below, when "text" is assigned to "print", it is
not global, and "print" retains the value of "null".

Thanks for the help,
Sam

var print="null";

function testWindow(text) { //called by first page
print = text;
alert("first -" + print)
var newWin;
newWin = window.open("dataPage.html","", "height=80,width=250");
}

function passVar() { //called by pop-up page
alert("second function -" + print);
document.write(print);
}