Jquery: Why will this if-else statement only follow the if, or the else, but wont follow both when they're different conditions that can be met..

Question

Question: Why wont the If and the Else both work, when both conditions can be met at different times by scrolling below or above '.fakeheading'? Is the Else-statement overpowering the If-statement?

JQUERY:
$(window).scrollTop(function() {

    $('.grid_12').find(function () {
        var $header = $(this);

         if ($header.offset().top < $(window).Top()) {
             $(".fakeheading").css({position:"fixed"})
         } else {
            $(".fakeheading").css({position:"absolute"}) 
        } 
    });
});

additional info/thoughts:
Why wont the 'if' statement work, if I have $(".fakeheading").css({position:"absolute"})
in the 'else' statement. Either the If, or the Else is working, but they will not both work together like they should. It's like my code wont obey the if-statement when I have the code that's contained in the else-statement. but if I mess up the else-statement code,(have it be

posssssition:"absolute"

then the if-statement part of my script works fine.

Answer 1

When you have and IF statement with and ELSE, only the first "true" condition is processed. Thus if the process looks like the following psuedo code:

 if (true) {do true stuff}
 else { do false stuff}

only the first one will actually process, the second will be not be.

On the other hand if you have:

 if (true) {do true stuff}
 if (other true stuff) {do other true stuff}

structure, they both could process if the condition is true

EDIT: One other note if you have:

if (true) {do true stuff} 
 else if (second true stuff) { do second true stuff} 
 else if (third true stuff) { do third true stuff}

only the first "true" process will execute, whichever one from the top down, equates to true first.