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I want a save function to check if a session is set (using another function) and stop the base function from continuing, but the function seems to continue (not executable below):

//1. Base save function

$("#save").click(function (e) 				
 e.preventDefault();
 //step 0 check if logged in
 checksession();
 console.log("teststop"); //just for testing
 //steps x continue execution of session exists
);

//2. Session check function
function checksession()	
 $.ajax( 
	type: "GET",
	url:"xxxx/sessioncheck.php",
	dataType: "text",
	cache: false,
	success: function(data)
	 if(data == "no")
		return;
 else //continue	
 
 );

let checksession's AJAX success callback be the function that performs the "save" operation (or not)

//1. Base save function

$("#save").click(function (e) 
 e.preventDefault();
 //step 0 check if logged in
 checksession();
);


//2. Session check function

function checksession() 
 $.ajax( 
 type: "GET",
 url:"xxxx/sessioncheck.php",
 dataType: "text",
 cache: false,
 success: function(data)
 if(data == "no")
 
 console.log( "stop" );
 else 
 console.log( "continue" ); 
 doSave();
 
 
 );



//3. Perform save operation

function doSave() 
 //
 // proceed with the save operation
 //

Try this:

 $("#save").click(function (e) 


 e.preventDefault();
 //step 0 check if logged in
 check();
if(check()==true)
continue;
else
stop

 console.log("teststop"); //just for testing
 //steps x continue execution of session exists
);

//2. Session check function
function check()
var result=false;
 function checksession() 
 $.ajax( 
 type: "GET",
 url:"xxxx/sessioncheck.php",
 dataType: "text",
 cache: false,
 success: function(data)
 if(data == "no")
 return;
 else 
result=true;
 //continue 
 
 );
 
return result;