Javascript Callback when variable is set to X
- by Erik
Hey everyone,
Have an issue I can't seem to wrap my head around. I'm wanting to write a generic javascript function that will accept a variable and a callback, and continue to execute until that variable is something other than false.
For example, the variable SpeedFeed.user.sid is false until something else happens in the code, but I don't want to execute a particular callback until it has been set.
The call:
SpeedFeed.helper_ready(SpeedFeed.user.sid, function(){
alert(SpeedFeed.user.sid);
// Run function that requires sid to be set.
});
The function:
helper_ready: function(vtrue, callback){
if(vtrue != false){
callback();
} else {
setTimeout(function(){
SpeedFeed.helper_ready(vtrue, callback);
}, SpeedFeed.apiCheckTime);
}
}
The issue I've narrowed it down to appears to be that because in the setTimeout I call vtrue instead of the actual SpeedFeed.user.sid, it's going to be set to false always. I realize I could write a specific function for each time that just evaluates the SpeedFeed.user.sid, but I'd like to have a generic method that I could use throughout the application.
Thanks for any insight :)
