I'm new to jQuery and javascript. I'm trying to create a single page website. The navigation is fixed at the top. When at a new 'part' of the single page I want the navigation to show that and the part currently on to be highlighted in the navigation.
I managed to somewhat do it with the scroll() but it only works if the variable 'top' is greater than 0. I know it is something probably really stupid I'm doing wrong but I'm new to this so I hope this doesn't bother you.
$(document).scroll( function() {
var top = $(document).scrollTop();
if ( 200 > top > 0 )
$(".navLinkTop").css("border-bottom", "5px solid #fff568");
else
$(".navLinkTop").css("border-bottom", "none");
if ( 400 > top > 200 )
$(".navLinkAbout").css("border-bottom", "5px solid #fff568");
else
$(".navLinkAbout").css("border-bottom", "none");
if ( 400 > top > 0 )
$(".navLinkWork").css("border-bottom", "5px solid #fff568");
else
$(".navLinkWork").css("border-bottom", "none");
if ( 400 > top > 0 )
$(".navLinkContact").css("border-bottom", "5px solid #fff568");
else
$(".navLinkContact").css("border-bottom", "none");
});
When you do something like a > b > c
it does not read out as "a is greater than b and b is greater than c". Rather, what happens is the following:
a > b > c
evaluates to (true) > c
(assuming a is indeed greater than b) which evaluates to Number(true) > c
since there is type conversion, which evaluates to 1 > c
which is pretty random So, 3 > 2 > 0
is true, but 3 > 2 > 1
is false. Generally, you just need to use &&
when you're doing AND .
This is because the >
operator is binary, that is it takes two arguments.
What you need to do is (a > b) && (b > c)
, &&
means "and"
In your case, this means changing statements like 200 > top > 0
to (top < 200) && (top > 0)
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