Develop Reference

scroll-to-top button on a mobile website

I'm trying to make the Scroll To Top button appear once the user started scrolling down, instead of it always being present, even when being at the top. Quick note, I barely have experience with JS, so I have no idea what I'm doing.
Anyway here is the page I'm having an error on: http://www.m.evans-carpentry.com/gallery/projects/
<script>
$(function() {
var $elem = $('#content');
$('#nav_up').fadeIn('slow');
$('#nav_down').fadeIn('slow');
$(window).bind('scrollstart', function(){
$('#nav_up,#nav_down').stop().animate({'opacity':'0.2'});
});
$(window).bind('scrollstop', function(){
$('#nav_up,#nav_down').stop().animate({'opacity':'1'});
});
$('#nav_down').click(
function (e) {
$('html, body').animate({scrollTop: $elem.height()}, 800);
}
);
$('#nav_up').click(
function (e) {
$('html, body').animate({scrollTop: '0px'}, 800);
}
);
});
</script>
Thanks!

you call jquery earlier announcements of jquery on line 30
<script>$('#nav Li: has (ul)').doubleTapToGo ();</script>
insert this line after the call jquery

Your code is too complex, try this:
$(document).ready(function(){
//Check to see if the window is top if not then display button
$(window).scroll(function(){
if ($(this).scrollTop() > 100) {
$('.scrollToTop').fadeIn();
} else {
$('.scrollToTop').fadeOut();
}
});
//Click event to scroll to top
$('.scrollToTop').click(function(){
$('html, body').animate({scrollTop : 0},800);
return false;
});
});
".scrollToTop" is the thing to be clicked that scrolls back to the top of the page.

I need a jQuery function to only work above 700px screen size, cant spot the error in my code

I have a jquery function that i want to disable below 700px. I have the following function:
<script>
$(document).ready(function() {
$(window).resize();
});
</script>
and
<script>
$(window).resize(function() {
if( $(this).width() > 700 ) {
$(window).load(function() {
$('.dh-container').directionalHover();
});
}
});
</script>
This seems like it should work, but i'm a noob to jquery, and can't find the error in my code, and the chrome inspector isn't displaying any errors.
If someone could spot my error, that would be great. And in the future, how would i go about diagnosing a jquery error that the chrome inspector doesn't point out?
Thank you

Your code works fine
<script>
$(document).ready(function() {
$(window).resize();
});
$(window).resize(function() {
if( $(this).width() > 700 ) {
$(window).load(function() {
alert("It's Working above 700px width");
});
}
});
</script>
Always start by testing simple procedures to find out mistakes.
Another way:
<script>
var width = $(window).width();
if (width > 700) {
alert('Display Above 700px');
} else {
alert('Do nothing since it's under 701px');
}
</script>

Javascript add class not working

Hi anyone got any ideas why my jQuery code wont work? Its embedded at the bottom of a joomla index.html file
$(window).load(function(){
if ($(window).scrollTop() > 10) {
$("#t3-mainnav").removeClass("arrowNav");
$("#t3-mainnav").addClass("darken")
} else {
$("#t3-mainnav").removeClass("darken");
$("#t3-mainnav").addClass("arrowNav");
}
});
this seems to work fine though,
$( document ).ready(function() {
console.log( "document loaded" );
});

Try something like this:
$(document).ready(function(){
$(window).scroll(function(){
if ($(window).scrollTop() > 10) {
$("#t3-mainnav").removeClass("arrowNav");
$("#t3-mainnav").addClass("darken")
} else {
$("#t3-mainnav").removeClass("darken");
$("#t3-mainnav").addClass("arrowNav");
}
})
});

$(function(){
$(window).scroll(function(){
if($(this).scrollTop()>=10){
$("#t3-mainnav").removeClass("arrowNav");
$("#t3-mainnav").addClass("darken")
} else {
$("#t3-mainnav").removeClass("darken");
$("#t3-mainnav").addClass("arrowNav");
}
});
});
This seemed to work guys, don't know why though :S
Thank you Alex and Sam

jquery menu bar fadein fadeout error

so after some questioning i wrote a jsfiddle page to show you what im tried. When going over the link the div shows up but when the mouse goes over it it fadesout and again fadesin. Isnt posible that when going above the div it just stays there until you move the mouse away?
the example on jsfiddle works when you go above the menubar Crepes..
here´s my jquery code.. the css and html are on jsfiddle
thanks for the help!
http://jsfiddle.net/DFxB7/
<script type="text/javascript">
$("#crep, #front").hover(function (e) {
e.preventDefault();
$("#front").fadeIn();
},
function(){
$("#front").fadeOut();
});
</script>

add the event .stop() like this:
$("#crep, #front").hover(function (e) {
e.preventDefault();
$("#front").stop().fadeIn();
},
function(){
$("#front").stop().fadeOut();
});
DEMO

I believe this may give you the functionality you're after...
var toggle = 0;
$("#crep, #front").hover(function (e) {
if(toggle == 0)
{
toggle = 1;
$("#front").stop().fadeIn();
}else{
toggle = 0;
$("#front").stop().fadeOut();
}
});

jQuery Scroll function after 100px

Using this script:
<script>
$(function() {
$(window).scroll(function(){
$('#Your element id').slideUp('slow');
});
});
</script>
Is it possible only to perform the action after the user has scrolled 100px or more?

You do need scrollTop as said. It would be wise to include an 'else' function as well, so that when you scroll back to the top the toggled element gets hidden again. As such:
$(document).ready(function() {
$('#scrollDiv').hide();
$(window).scroll(function() {
if ($(document).scrollTop() > 100) {
$('#scrollDiv').fadeIn('slow');
}
else {
$('#scrollDiv').fadeOut('slow');
}
});
});​
Here is a quick jsfiddle

You can use .scrollTop() to get how far the page has been scrolled
<script>
$(function() {
$(window).scroll(function(){
if($(this).scrollTop() > 100) {
$('#Your element id').slideUp('slow');
}
});
});
</script>