I need to convert the fallowing working script as so it works on scroll regardless of how the site is being scrolled.
// // HEADER
$(window).bind('mousewheel', function(event) {
if ($(document).scrollTop() <= 20 || event.originalEvent.wheelDelta > 0 && $(document).scrollTop() <= 105) {
//console.log('large');
headerLarge();
}
else if (event.originalEvent.wheelDelta > 0 && $(document).scrollTop() <= 120) {
//console.log('medium');
headerMed();
}
else if (event.originalEvent.wheelDelta < 0 && $(document).scrollTop() >= 100) {
//console.log('small');
headerSm();
}
});
I tried using the following without success:
$(document).on('scroll', function(event) { ...
This should work
$(window).scroll(function(){
});
You can do it using $(window).scroll() like this:
$(window).scroll(function() {
alert("scrolling!");
});
Taken From Infinite Scroll Paging
Related
I'm trying to add and remove some classes depending on the scroll position. The problem in my code is that it's not doing my else if conditions.
Also, can I use any other measurements? Such as document.body.scrollTop < 25%
<script>
window.onscroll = function() {scrollFunction()};
function scrollFunction() {
if (document.body.scrollTop < 800 || document.documentElement.scrollTop < 800) {
document.querySelector(".navbar").classList.add('nav-dark');
} else if(document.body.scrollTop === 0 || document.documentElement.scrollTop === 0){
document.querySelector(".navbar").classList.add('nav-transparent');
document.querySelector(".navbar").classList.remove('nav-dark');
}
}
</script>
0 will always be less than 800; as such, you need to change the order of your statements.
if(document.body.scrollTop === 0 || document.documentElement.scrollTop === 0){
document.querySelector(".navbar").classList.add('nav-dark');
} else if (document.body.scrollTop < 800 || document.documentElement.scrollTop < 800) {
document.querySelector(".navbar").classList.add('nav-transparent');
document.querySelector(".navbar").classList.remove('nav-dark');
}
Your code can be simplified by using window.pageYOffset instead to get the vertical amount scrolled. See my answer here if you want a robust cross browser solution.
if(window.pageYOffset === 0){
document.querySelector(".navbar").classList.add('nav-dark');
} else if (window.pageYOffset < 800) {
document.querySelector(".navbar").classList.add('nav-transparent');
document.querySelector(".navbar").classList.remove('nav-dark');
}
Reverse the condition i..e move condition with 0 first and then < 800. Since 0 is also less than 800 that's why it is not going into else if block.
I am trying to show 3 divs (sequentially and when scrolling), and only between two pixel values for each div, but there is something about my script that I don't understand:
What I want to show is:
div-1 only visible between 200 and 500 px
div-2 only visible between 900 and 1200 px
div-3 only visible between 1600 and 1900 px
What am I doing wrong here?
DEMO (JSFiddle)
And on the other hand, is there any simpler and more elegant way to do this?
Thanks in advance!
SCRIP:
$(window).scroll(function() {
if ($(this).scrollTop() > 200) {
//if (document.body.scrollTop > 200 || document.documentElement.scrollTop < 500) {
$('#div-1').fadeIn();
}
else {
$('#div-1').fadeOut();
};
if ($(this).scrollTop() > 900) {
//if (document.body.scrollTop > 900 || document.documentElement.scrollTop < 1200) {
$('#div-2').fadeIn();
}
else {
$('#div-2').fadeOut();
};
if ($(this).scrollTop() > 1600) {
//if (document.body.scrollTop > 1600 || document.documentElement.scrollTop < 1900) {
$('#div-3').fadeIn();
}
else {
$('#div-3').fadeOut();
};
});
HTML:
<div id="div-1">Radio</div>
<div id="div-2">Blog</div>
<div id="div-3">Store</div>
<div id="content"></div>
CSS:
#div-1,#div-2,#div-3 {
display:none;
position:fixed;
width:200px;
height:60px;
margin:0 auto;
text-align:center;
font-size:20px;
line-height:60px
}
#div-1{background:#ff0;color:#000}
#div-2{background:#000;color:#fff}
#div-3{background:green;color:#fff}
#content{text-align:center;height:2500px}
You were just missing &&.
if ($(this).scrollTop() > 200 && $(this).scrollTop() < 500) {
// ...
}
if ($(this).scrollTop() > 900 && $(this).scrollTop() < 1200) {
// ...
}
if ($(this).scrollTop() > 1600 && $(this).scrollTop() < 1900) {
// ...
}
"If scrolling is greater than 200 AND at the same time the scrolling is less than 500, then show div-1"...
Here is a working example: JSFiddle
You are missing a couple things:
All of your logic should use && instead of ||
You should check the visibility of items before showing or hiding them.
You should always store references to commonly accessed DOM elements, especially if you are accessing them inside a scroll event handler (which fires A BUNCH).
OK, that last point is just a performance thing... but you should know it!. Here is an updated fiddle:
http://jsfiddle.net/xebgpduv/
Here's what a block of logic looks like:
if (scrollTop > 200 && scrollTop < 500) {
if(!$div1.is(':visible')) {
$div1.fadeIn();
}
} else if($div1.is(':visible')) {
$div1.fadeOut();
};
jQuery won't remove the class after scrolling
This is my script:
$(window).scroll(function(){
if($(window).scrollTop() >= $("#white").offset().top -70) {
$('.burger-menu').addClass('white');
} else {
$('.burger-menu').removeClass('white');
}
});
$(window).scroll(function(){
if($(window).scrollTop() >= $("#color-main").offset().top -70) {
$('.burger-menu').addClass('color-main');
} else {
$('.burger-menu').removeClass('color-main');
}
});
$(window).scroll(function(){
if($(window).scrollTop() >= $("#yellow").offset().top -70) {
$('.burger-menu').addClass('yellow');
} else {
$('.burger-menu').removeClass('yellow');
}
});
This is my HTML:
<section class="home-page" id="white">Blablabla</section>
<section class="wrap" id="color-main">Blablabla</section>
<section class="wrap" id="yellow">Blablabla</section>
but my <div>
<div class="burger-menu white color-main yellow">
still has the classes "white" and "color-main", which should be removed. :(
I made a codepen for you to see it.
There are 2 fixes I would recommed you try:
Don't do multiple .scroll(function(){...}) calls, they overwrite each other.
Use $("body").scroll(function(){...}), because that's the element you (usally) scroll in
The below example uses only the IF statement and deletes the other classes. Try this and see if you get the result you desire. Instead of relying on an ELSE that could be broken by another scroll function else statement we simply remove all classes and only add the class you want.
Example:
$(window).scroll(function () {
if ($(window).scrollTop() >= $("#white").offset().top - 70) {
$('.burger-menu').removeClass("color-main").removeClass("yellow").addClass('white');
}
});
$(window).scroll(function () {
if ($(window).scrollTop() >= $("#color-main").offset().top - 70) {
$('.burger-menu').removeClass("white").removeClass("yellow").addClass('color-main');
}
});
$(window).scroll(function () {
if ($(window).scrollTop() >= $("#yellow").offset().top - 70) {
$('.burger-menu').removeClass("color-main").removeClass("white").addClass('yellow');
}
});
I agree with those who suggest putting them all in a single .scroll() function. This worked for me:
(function($) {
$(window).scroll(function () {
if ($(window).scrollTop() >= $("#white").offset().top - 70) {
$('.burger-menu').addClass('white');
} else {
$('.burger-menu').removeClass('white');
}
if ($(window).scrollTop() >= $("#color-main").offset().top - 70) {
$('.burger-menu').addClass('color-main');
} else {
$('.burger-menu').removeClass('color-main');
}
if ($(window).scrollTop() >= $("#yellow").offset().top - 70) {
$('.burger-menu').addClass('yellow');
} else {
$('.burger-menu').removeClass('yellow');
}
});
})(jQuery);
To have only one class active at a time, use removeClass to remove the others. You can use a single scroll event handler, and rearrange the code to look for the last section first, that makes the code simpler:
$(window).scroll(function(){
var top = $(window).scrollTop() + 70;
if (top >= $("#yellow").offset().top) {
$('.burger-menu').removeClass('white color-main').addClass('yellow');
} else if(top >= $("#color-main").offset().top) {
$('.burger-menu').removeClass('white yellow').addClass('color-main');
} else if (top >= $("#white").offset().top) {
$('.burger-menu').removeClass('color-main yellow').addClass('white');
} else {
$('.burger-menu').removeClass('white color-main yellow');
}
});
Demo: https://jsfiddle.net/Guffa/yka8nzt4/1/
Another way would be to determine the status for each class:
$(window).scroll(function(){
var top = $(window).scrollTop() + 70;
var white = top >= $("#white").offset().top;
var main = top >= $("#color-main").offset().top;
var yellow = top >= $("#yellow").offset().top;
$('.burger-menu')
.toggleClass('white', white && !main)
.toggleClass('color-main', main && !yellow)
.toggleClass('yellow', yellow);
});
I am trying to create a active state of the page navigation depending on where you are down the page.
this is what I have so far....
$(window).scroll(function () {
var scroll = $(window).scrollTop();
if (scroll >= 0) {
$(".nav1").addClass("active");
} else if (scroll >= 500) {
$(".nav1").removeClass("active");
$(".nav2").addClass("active");
} else {
$(".active").removeClass("active");
}});
but not working as expected
$(window).scrollTop(); cannot be negative. So your code will always execute the first if statement. This one
if scroll >= 0) {
$(".nav1").addClass("active");
}
The rest of your code will never be executed.
Try seperate your if statements.
if (scroll >= 0) {
$(".nav1").addClass("active");
}
if (scroll >= 500) {
$(".nav1").removeClass("active");
$(".nav2").addClass("active");
} else {
$(".active").removeClass("active");
}});
$(function() {
$(document).scroll(function() {
var windowscroll = $(this).scrollTop();
if($(window).scrollTop() >= 900)
{
$("#scrollhome").css("opacity",(1-($(window).scrollTop()-900)/75))
}
else
$("#scrollhome").css("opacity",1)
if(windowscroll > 900 && windowscroll < 1300)
{
$("#scrollabout").css("opacity",($(window).scrollTop()-900)/75)
}
else
$("#scrollabout").css("opacity",0)
if(windowscroll > 1200 && windowscroll < 1500)
{
$("#scrollabout").css("opacity", (-1($(window).scrollTop()-1200)/75))
$("#scrolldesign").css("opacity",($(window).scrollTop()-1200)/75)
}
else
$("#scrolldesign").css("opacity",0)
});
});
the first overlap between scrollhome and scrollabout works nice but when it comes to the second overlap between scrollabout and scroll design i don't know how to hide the scrollabout funktion in a smooth way again, i need help! how can i make the scrollabout hidden again using scrolltop?
you misstyped it as -1($(window)...... it should also be 1-($(window)