Question

Is it possible? How to do this? When clicking on a button, I call function1. If the condition is true (i==1), the function1 pauses and the following code will only be executed after function2 is totally executed. Example:

function1(i){
    //some code here
    if(i == 1){
        function2(i);  // call function2 and waits the return to continue
    }
    //the following code
}

function2(i){
    //do something here and returns
}

Answer 1

Here you go:

function1(i){
    //some code here
    if(i == 1){
        function2(i);  // call function2 and waits the return to continue
    }
    //the following code
}

function2(i){
    //do something here and returns
}

In case you meant that function2 is actually async in some manner:

function1(i){
    //some code here
    if(i == 1){
        // call function2 and waits for return to continue
        function2(i, function() {
            // the following code
        });  
    }
    else {
        //the following code
    }
}

function2(i, callback){
    //do something async here and return when complete
    setTimeout(callback, 1000);
}