I need some concept of threading java script.Actually I struck in one problem .Problem is that I have one function A () calling function B and C.
function A(){
B();
C();
}
function B(){
//doing some task
i=something;
alert(i);
}
function C(){
// i need value I here.
alert(i) //getting undefined
}
I need to synchronised call ...
How about
function A(){
C(B());
}
function B(){
//doing some task
var i=something;
return i;
}
function C(i){
// i need value I here.
alert(i)
}
or split out for readability
function A(){
var resultFromB = B(); //
C(resultFromB);
}
function B(){
//doing some task
var result=something;
return result; // return it to calling function
}
function C(resultOriginallyFromB) { // passing it
alert(resultOriginallyFromB);
}
B() is returning something to be passed along later, but it does save on memory by not re-declaring a variable.
var returnedFromB=B(); in C?Set i as global like,
var i=null;// global i
function A(){
B();
C();
}
function B(){
//doing some task
i=something;
alert(i);
}
function C(){
i need value I here.
alert(i) //getting undefined
}
Read this also
Alternatively, you can use return in B() like,
function A(){
i=B();
C(i);//passing i in C()
}
function B(){
//doing some task
i=something;
alert(i);
return i;//return i
}
function C(i){
// value i has been passed in.
alert(i);
}
Actually it should not really be alerting undefined in function C. As i would have become globally defined already, without the use of var.
Besides try doing it this way, so that you don't clutter the global space:
(function() {
var i;
function A(){
B();
C();
}
function B(){
//doing some task
i=4; // --- or something
alert(i); // --- will alert 4
}
function C(){
// i need value I here.
alert(i) // --- will alert 4
}
A(); // --- Assuming you were calling 'A' earlier as well
})();
And yes, nothing related to threading here.
ias a global variable.B()will be called and completed, before the call toC(). So I'm not sure why you're talking about Threading, when it looks like you're talking about Scope.