Variable Scope

[slarson8821]

      function initialize() {

        function successCallback(pos){
	  LAT = pos.coords.latitude;
	  LON = pos.coords.longitude;
	  load();
        }

	function errorCallback(){
	  alert("FAIL");
	}

        if(navigator.geolocation) {
          navigator.geolocation.getCurrentPosition(successCallback, errorCallback, {enableHighAccuracy: true});
        }else {
          alert('Sorry, your browser does not support geolocation.');
        }

      }

 

Makes the LAT and LON available outside the function, i thought since I didnt do var LAT = 0; and var LON = 0; outside of the function that it would be function access only.

[kicken]

You have to use the var keyword to limit the scope.  When you use a variable, JS will walk up the scope chain to find it.  If it gets up to the global scope before finding it, it will create it there.  Using the 'var' keyword will declare the variable at that scope level so JS will find it and not look further.

 

Though not really technically correct, you can think of it as:

Variables are global by default, and you use 'var' to make them local.

 

[gizmola]

You have to use the var keyword to limit the scope.  When you use a variable, JS will walk up the scope chain to find it.  If it gets up to the global scope before finding it, it will create it there.  Using the 'var' keyword will declare the variable at that scope level so JS will find it and not look further.

 

Great summary.