Develop Reference

jQuery scroll function does not work

I have this function:
$(document).ready(function() {
if ($(".splash").is(":visible")) {
$(".site").css({"opacity":"0"});
}
});
$(window).scroll(function(){
$(window).off("scroll");
$(".splash").slideUp("800", function() {
$("html, body").animate({"scrollTop":"0px"},100);
$(".site").delay(100).animate({"opacity":"1.0"},800);
});
})
I use this to pass from splash page to home in animation way. But when I'm in home page the scroll is still off and I need it to make a change in hte header. I use this code:
$(document).ready(function( $ ) {
$(window).scroll(function() {
var sT = $(this).scrollTop();
if (sT >= 200) {
$('header').addClass('scroll-header')
} else {
$('header').removeClass('scroll-header')
}
});
});
This two parts fight together!! How can I put on scroll after splash page to go out? Thanks!

In the end i have try to not use scroll off, and change with a simple
.show_splash{position: fixed;}
In this way finely work!!!

How do I use multiple functions in jQuery?

I've added jQuery function that shows and hides navbar when scrolled. I also want to hide a div when the button 'start' is clicked. After i add new function none of them works longer. I have tried to add it to various places, but I still get no result at all. So how do I add multiple functions and make them to work?
Heres my code:
<script>
// function that hides text on click
(function($) {
$('#start').click(function() {
$('.lead').hide());
});
});
// my original function that stopped working after i added new one
(function($) {
$(document).ready(function() {
$(".masthead").css("background-color", "inherit");
// fade in .navbar
$(function() {
$(window).scroll(function() {
// set distance user needs to scroll before we fadeIn navbar
if($(this).scrollTop() > 600) {
$('.masthead').fadeIn();
$(".masthead").css("background-color", "black");
} else if($(this).scrollTop() === 0) {
$('.masthead').fadeIn();
$(".masthead").css("background-color", "inherit");
} else {
$('.masthead').fadeOut();
}
});
});
});
}(jQuery));
</script>

I think the problem is in the closing tag of the function you're adding.
Try like this:
(function ($){
$('#start').click(function(){
$('.lead').hide();
});
}(jQuery));
// my original function that stopped working after i added new one
(function ($) {
$(document).ready(function(){
$(".masthead").css("background-color","inherit");
// fade in .navbar
$(function () {
$(window).scroll(function () {
// set distance user needs to scroll before we fadeIn navbar
if ($(this).scrollTop() > 600) {
$('.masthead').fadeIn();
$(".masthead").css("background-color","black");
} else if($(this).scrollTop() === 0){
$('.masthead').fadeIn();
$(".masthead").css("background-color","inherit");
} else {
$('.masthead').fadeOut();
}
});
});
});
}(jQuery));

At least, closing bracket is wrong here. $('.lead').hide());
Tip: always check developer console first. Have fun coding.

Edit : Note that you have an extra closing bracket in the first function $('.lead').hide());.
You can use the following. Both functions can be combined in to a single block. And you can use $(document).ready() directly. If there is a problem with name conflict for $ use jQuery.noConflict();
<script>
$(document).ready(function() {
$(".masthead").css("background-color", "inherit");
// fade in .navbar
$('#start').click(function() {
$('.lead').hide();
});
$(window).scroll(function() {
// set distance user needs to scroll before we fadeIn navbar
if ($(this).scrollTop() > 600) {
$('.masthead').fadeIn();
$(".masthead").css("background-color", "black");
} else if ($(this).scrollTop() === 0) {
$('.masthead').fadeIn();
$(".masthead").css("background-color", "inherit");
} else {
$('.masthead').fadeOut();
}
});
});
</script>

Execute function only if window width is greater than something else don't

function dropdownHover() {
jQuery('ul.nav li.dropdown').hover(function() {
jQuery(this).find('.dropdown-menu').stop(true, true).delay(200).fadeIn();
}, function() {
jQuery(this).find('.dropdown-menu').stop(true, true).delay(200).fadeOut();
});
}
$(window).on('resize', function(event){
var windowSize = $(window).width();
if(windowSize > 992){
dropdownHover();
}
});
I need this function dropdownHover() to fire only when window is greater than 992px, both on load and on resize, else if window is < 992px, both on load or on resize i dont want to fire this function on hover i want regular bootstrap dropdown on click. I tried to do this with css but i cant add animation on dropdown because its just display: none/block. I also tried to add class on resize to fire this function if element has that class else dont but it doesnt work either.
Edit: Final working version
$('.dropdown').on('mouseenter', function(){
if(!$(this).is('.open') && $(window).data('wide'))
$('.dropdown-menu', this).dropdown('toggle').hide()
.stop(true, true)
.delay(200)
.fadeIn(function(){
this.style.display = '';
}).find('a').on('touchstart click', function (e) {
e.stopPropagation();
});
}).on('mouseleave', function(){
if($(this).is('.open') && $(window).data('wide'))
$('.dropdown-menu', this).dropdown('toggle');
});
$('.dropdown').on('click', function(e){
if( $(window).data('wide')) {
$('.dropdown-menu', this).dropdown('toggle');
} else {
$('.dropdown-menu', this)
.stop(true, true).slideToggle()
.closest('.dropdown').removeClass('open');
}
});
// not entirely necessary. Not sure which is faster: this or just checking the width in all three places.
$(window).on('resize', function(){
$(window).data('wide', $(window).width() > 992);
// reset the open menues
$('.dropdown').removeClass('open');
$('.dropdown-menu').css({
display: '',
left: '',
position: '',
});
// because we are checking the width of the window, this should probably go here although this really should be a media query style
$('.dropdown-menu.pull-center').each(function() {
var menuW = $(this).outerWidth();
if ($(window).width() > 1000) {
$(this).css({
left: - menuW / 2 + 60 + 'px',
position: 'absolute'
});
} else {
$(this).css({
left: '',
position: ''
});
}
});
}).trigger('resize');

Initial Solution
Your question is twofold. First, you need it to not show the menu at smaller sizes. For that, you check on resize what the window width is. The problem is that it only works once. It triggers the event listeners for hover and it doesn't kill those event listeners if the screen is then larger at some point. For that, you can set a flag. There are a lot of ways to do this, but for my answer, I've chosen to use jQuery .data() method.
$(window).on('resize', function(event){
var windowSizeWide = $(window).width() > 600; // reduced for testing purposes
jQuery('ul.nav li.dropdown').data('dropdown-enabled', windowSizeWide);
}).trigger('resize');
Then when we listen for the hover events (which are mouseenter and mouseleave events), we simply return out of the function if the screen is too small.
jQuery('ul.nav li.dropdown').on('mouseenter', function() {
if(!jQuery(this).data('dropdown-enabled')) return;
jQuery(this).find('.dropdown-menu').stop(true, true).delay(200).fadeIn();
}).on('mouseleave', function() {
if(!jQuery(this).data('dropdown-enabled')) return;
jQuery(this).find('.dropdown-menu').stop(true, true).delay(200).fadeOut();
}).find('.dropdown-menu').hide();
Finally, you also want the event to trigger on load. You can do that by simply adding .trigger('resize') as seen in the first snippet. You can see a functioning demo here: http://jsfiddle.net/jmarikle/xw9Ljshu/
Possible Alternative Solution
Alternatively, you can also use CSS to handle this with media queries. The simplest way to do this is to force display: none on smaller screens. I don't recommend completely hiding the element because it becomes inaccessible at that point, but this is the general idea:
#media(max-width: 600px) {
ul.dropdown-menu {
display:none !important;
}
}
Note that !important is used because jQuery adds inline styles when you fadeIn or fadeOut.
Second demo: http://jsfiddle.net/jmarikle/xw9Ljshu/1

window.screen.availWidth to get the window size. i am yet not tested your code.But i think this will ok.
function dropdownHover() {
jQuery('ul.nav li.dropdown').hover(function() {
jQuery(this).find('.dropdown-menu').stop(true, true).delay(200).fadeIn();
}, function() {
jQuery(this).find('.dropdown-menu').stop(true, true).delay(200).fadeOut();
});
}
$(document).ready(function(){
$(window).on('resize', function(event){
var windowSize = window.screen.availWidth;
if(windowSize > 992){
dropdownHover();
}
});
})

Showing/hiding bootstap's .hidden-xs in jQuery

I'm trying to create an 'up' button, which will take user to the very top of the landing page. jsFiddle
I would like this button to be shown only on devices with large screens, so I'm using bootstrap3's hidden-xs class. This class applies display: none!important for small devices and display: block!important for large screens.
But now, I would like to make this button visible only, when scrolled down at least 50 pixels.
So, I would like to do something like:
$(document).ready(function() {
$(window).scroll(function() {
if($(window).scrollTop() < 50) {
// Near top.
$('#scrollUp:visible').slideUp();
}
else {
$('#scrollUp:hidden').slideDown();
}
});
});
jQuery's slideUp() and slideDown() apply display: none and display: block, but without !important.
This means that display: block!important applied by .hidden-xs is more important than css applied by slideDown() and slideUp().
It worked great until I started using .hidden-xs.
I tried $.animate({'display': 'none!important'}) instead of $.slideUp, but then I get another problem -- jQuery isn't properly selecting elements with :hidden. jsFiddle
Do you have an idea, what may I do wrong? Is there a way to do this nicely?
Thanks in advance!

Try
(function () {
var timer;
$(window).scroll(function () {
clearTimeout(timer)
timer = setTimeout(function () {
if ($(window).scrollTop() < 50) {
// Near top.
console.log('If elemnt is visible it should be hidden here');
$('#scrollUp:visible').stop(true, true).slideUp(function () {
$(this).removeClass('hidden-xs');
});
} else {
console.log('If element is hidden it should be displayed here');
$('#scrollUp:hidden').addClass('hidden-xs').stop(true, true).slideDown(function () {
$(this).css('display', '')
});
}
}, 100);
});
})()
Demo: Fiddle

Fade in/out div scrollTop

I have a floating menu that i want to fade in when you start to scroll down the page, then fade out when you are back at the top of the page. I have got it working without the fade, but im not sure how to add the fades. Any help appreciated. Thanks.
$(document).scroll(function() {
$('#floatingnav').toggle($(this).scrollTop()>250)
});
css
#floatingnav {
position:fixed;
display:none;
}

You can use fadeToggle with some duration as an argument(just incase you want) instead of plane toggle.That will do your job.
$(document).scroll(function() {
$('#floatingnav').fadeToggle($(this).scrollTop()>250)
});

You can try this to test if div has reached top
$(window).scroll(function () {
var d = $('div'); // this is your fixed div
if (d.offset().top > 250) {
d.fadeIn();
} else {
d.stop().fadeOut();
}
});
TEST FIDDLE

$(window).bind("scroll", function() {
if ($(this).scrollTop() > 250) {
$("#floatingnav").fadeIn();
} else {
$("#floatingnav").stop().fadeOut();
}
});