I searched very long but haven't found a soulution yet.
I want to scroll to the next element on scroll.
$(window).load(function(){
var scroll = false;
$(function() {
//Create an Array
var sites = $('.site');
var position = 0; //Start Position
var next = $('#next');
var lastScrollTop = 0;
$(window).scroll(function(event){
if(scroll == false){
scroll = true;
$(document).off('scroll');
var st = $(this).scrollTop();
if (st > lastScrollTop){
if (position !== sites.length - 1) {
scrollToPosition(sites[position += 1]),5000;
}
} else {
if (position !== 0) {
scrollToPosition(sites[position -= 1]),5000;
}
}
lastScrollTop = st;
}
});
})
function scrollToPosition(element) {
if (element !== undefined) {
scrollToElement($(element).attr('id'));
}
}
function scrollToElement(selector, time, verticalOffset) {
time = typeof(time) != 'undefined' ? time : 500;
verticalOffset = typeof(verticalOffset) != 'undefined' ? verticalOffset : 0;
selector = "#" + selector;
var element = $(selector);
offset = element.offset();
offsetTop = offset.top + verticalOffset;
$('html, body').animate({
scrollTop: offsetTop
}, time);
scroll = false;
}
});
the html has many of these with different ids
<div id="test" style="width:100%; height:100vh;" class="site">
</div>
So the containers are fullscreen hight. and when the user scrolls a bit he should get to the next container.
At the moment it scrolls till the end and or more.
It would help if you could create an example in jsFiddle or CodePen, but the first thing I would do is stop any current jQuery animations before launching new ones:
$('html, body').stop().animate({
scrollTop: offsetTop
}, time);
You should keep in mind that scroll handler is executed many times when user is scrolling.
Also, unrelated - your scrollToPosition calls have brackets at the wrong place and should probably be like this:
scrollToPosition(sites[position += 1], 5000);
Edit:
Another thing that might cause problems - you should unset the 'scroll' flag/variable only when the animation has finished, something like this:
$('html, body').stop().animate({
scrollTop: offsetTop
}, time, function () {
scroll = false;
});
Related
I'm facing a very strange error, which is animation on body during mouse scroll. I think its happening because of the jQuery event window.scroll. I have tried a lot of things like unbinding of animation on mouse scroll, but nothing works. Below is my code.
$(document).on("scroll", function () {
var lastScrollTop = 0;
var windowHeight = $(window).scrollTop();
var seccion1 = $("#seccion1").height();
var seccion2 = $("#seccion2").offset().top;
var alturaseccion2 = $("#seccion2").height();
//this function returns in which section is the user with the scroll
var localizacion = comprobarSeccion(seccion1, seccion2);
if (windowHeight > lastScrollTop) {
// down scroll
console.log("scrollabajo");
if (localizacion == 1) {
$("html, body").animate({
scrollTop: $("#seccion2").offset().top
}, 2);
$(document).bind("scroll");
} else if (localizacion == 2) {
if (windowHeight >= ((alturaseccion2 * 0.80) + seccion2) && windowHeight <= (alturaseccion2 + seccion2)) {
} else {
}
}
} else {
// up scroll
console.log("scrollarriba");
}
lastScrollTop = windowHeight;
});
ยดยดยด
I'm not sure what you are trying to accomplish, but if your trying to trigger an event with a specific scroll value you can use the code below
$(window).scroll(function () {
var scroll = $(window).scrollTop();
if (scroll >= 500) {
alert("scroll is greater than 500 px)
} else if(scroll==500){
alert("scroll has hit 500px");
}
});
Is it possible to detect if the user scrolls more than 20px wherever it's on the page??
I mean, in a one page design, I need to remove a class when the user scrolls more than 20px but not only from the top of the document.
Each time he opens a popup, a class is added to the popup in question, once the user scrolls, I would like to remove this class.
Repeat this function no matter where it's on the page.
My current code :
$(window , 'body').on('scroll', function() {
$('.navbar-collapse').collapse('hide');
$("#wrapper").removeClass('newsletter-opened');
$("#newsletter").removeClass('opened');
});
Thank you!
You can use jQuery for that.
With my solution, if user has scroll 200px when he come on your page if he scroll to top or bottom with minumum 20px of scroll your changes was called.
var userScroll = $(document).scrollTop();
$(window).on('scroll', function() {
var newScroll = $(document).scrollTop();
if(userScroll - newScroll > 20 || newScroll - userScroll > 20){
$('.navbar-collapse').collapse('hide');
$("#wrapper").removeClass('newsletter-opened');
$("#newsletter").removeClass('opened');
}
}
EDIT:
After look your jsFiddle, i know what you want, just check that :
Just define the scroll at the moment when popin is enable and make your job only when the popin has class opened
$(document).ready(function(){
$("a.open-newsletter").on( "click", function() {
$("#newsletter").toggleClass('opened');
userScroll = $(document).scrollTop();
return false;
});
$(window , 'body').on('scroll', function() {
if ( $("#newsletter").hasClass('opened') ) {
var newScroll = $(document).scrollTop();
if (userScroll - newScroll > 100 || newScroll - userScroll > 100) {
$("#newsletter").removeClass('opened');
}
}
});
});
Actually, the Scroll function will take effect on every pixel the page is scrolled, which is too heavy in terms of performance.
As a result, if you just take the difference between newScroll & userScroll, the result may be wrong sometimes (because the new and old scroll positions will be updated shortly as the page is moving along)
Therefore, we can just set a time interval which checks the scroll position every 250 milliseconds (this will both increase performance and give time for users to scroll more than 20px as your requirement):
var didScroll;
var lastScrollTop = 0;
var delta = 20;
$(window).scroll(function(event){
didScroll = true;
});
setInterval(function() {
if (didScroll) {
hasScrolled();
didScroll = false;
}
}, 250);
function hasScrolled() {
var st = $(this).scrollTop();
// Return if they scroll less than 20px (delta)
if(Math.abs(lastScrollTop - st) <= delta)
return;
// Do what you want here
console.log("lastScrollTop: ",lastScrollTop, " - newScroll: ", st);
$('.navbar-collapse').collapse('hide');
$("#wrapper").removeClass('newsletter-opened');
$("#newsletter").removeClass('opened');
lastScrollTop = st;
}
EDITED VERSION BELOW:
(according to your fiddle, I deleted "use strict" and commented out the $('.navbar-collapse') & $('#wrapper'))
Would you mind trying this again (seems that some previous errors just prevented my code from executing)
$(document).ready(function(){
$("a.open-newsletter").on( "click", function() {
$("#newsletter").toggleClass('opened');
return false;
});
var didScroll;
var lastScrollTop = 0;
var delta = 20;
$(window).scroll(function(event){
didScroll = true;
});
setInterval(function() {
if (didScroll) {
hasScrolled();
didScroll = false;
}
}, 250);
function hasScrolled() {
var st = $(this).scrollTop();
// Return if they scroll less than 20px (delta)
if(Math.abs(lastScrollTop - st) <= delta)
return;
// Do what you want here
console.log("lastScrollTop: ",lastScrollTop, " - newScroll: ", st);
//$('.navbar-collapse').collapse('hide');
//$("#wrapper").removeClass('newsletter-opened');
$("#newsletter").removeClass('opened');
lastScrollTop = st;
}
});
I have two menus on a page, I am trying to show the one when the page is loaded and the other when there is a scroll.
This is my page Link
I would like to show the white part when position is at the top
and the blue part when there is a scroll past the top position
This is what am trying presently
<script type="text/javascript" src="//code.jquery.com/jquery-git.js"></script>
<script type='text/javascript'>//<![CDATA[
$(function(){
// Hide Header on on scroll down
var didScroll;
var lastScrollTop = 0;
var delta = 5;
var navbarHeight = $('header').outerHeight();
$(window).scroll(function(event){
didScroll = true;
});
setInterval(function() {
if (didScroll) {
hasScrolled();
didScroll = false;
}
}, 250);
function hasScrolled() {
var st = $(this).scrollTop();
// Make sure they scroll more than delta
if(Math.abs(lastScrollTop - st) <= delta)
return;
// If they scrolled down and are past the navbar, add class .nav-up.
// This is necessary so you never see what is "behind" the navbar.
if (st > lastScrollTop && st > navbarHeight){
// Scroll Down
$('header').removeClass('nav-bar-below op-page-header cf').addClass('banner include-nav');
} else {
// Scroll Up
if(st + $(window).height() < $(document).height()) {
$('header').removeClass('banner include-nav').addClass('nav-bar-below op-page-header cf');
}
}
lastScrollTop = st;
}
});//]]>
</script>
can some one please help its not working for me
You can just detect if the scroll is at the top of the page or not whenever scroll event fired. if yes, show white header, and vice versa
$(window).scroll( function() {
var scrollPosition = $(window).scrollTop();
if(scrollPosition === 0) {
//show white header
}
else {
//show blue header
}
}
Of course you have to make sure when page first load, it show the white one first (use css). since the code above won't run Until user do scroll (fire this event)
*EDIT
for this :
"and the blue part when there is a scroll past the top position"
you can try this plugin
http://stickyjs.com/
sample code for fix the menu at top position.
$(document).scroll(function() {
var y = $(document).scrollTop()
var header = $('.include-nav');
var blue-menu = $('.cf');
var screenHeight = header.height();
if (y >= screenHeight) {
blue-menu.css({
position : "fixed",
"top" : "0",
"left" : "0"
});
header.css("position", "relative");
} else {
blue-menu.css("position", "relative");
}
});
I'm creating a page with sticky nav and it doesn't stick to the top immediately after the header image moves away (it's less than full page size). It only sticks after the size of one full page image has passed. The text inside the nav bar also moves after it sticks.
You can view the code here: https://jsfiddle.net/zinctan/7a436ojz/
This is my javascript:
$(function() {
// when we scroll down the window, do this:
$(window).scroll(function(){
//Getting the scroll percentage
var windowHeight = $(window).height();
var scrollHeight = $(window).scrollTop();
var scrollPercentage = (scrollHeight / windowHeight);
console.log(scrollPercentage);
// if we have scrolled past 200, add the alternate class to nav bar
if(scrollPercentage > 1) {
$('.navHighlighter').addClass('scrolling');
} else {
$('.navHighlighter').removeClass('scrolling');
}
});
$('a[href*=#]:not([href=#])').click(function() {
if (location.pathname.replace(/^\//,'') == this.pathname.replace(/^\//,'') && location.hostname == this.hostname) {
var target = $(this.hash);
target = target.length ? target : $('[name=' + this.hash.slice(1) +']');
if (target.length) {
$('html,body').animate({
scrollTop: target.offset().top - 80
}, 1000);
return false;
}
}
}); // code courtesy of CSS-Tricks
// apply the class of nav-active to the current nav link
$('a').on('click', function(e) {
e.preventDefault();
$('li.nav-active').removeClass('nav-active');
$(this).parent('li').addClass('nav-active');
});
// get an array of 'href' of each a tag
var navLink = $('ul.navHighlighter a');
console.log(navLink);
var aArray = [];
for(var i = 0; i < navLink.length; i++) {
console.log(i);
var aChild = navLink[i];
var navArray = $(aChild).attr('href');
console.log(navArray);
aArray.push(navArray);
console.log(aArray);
var selector = aArray.join(" , ");
console.log(selector);
}
$(window).scroll(function(){
var scrollTop = $(window).scrollTop();
var tops = [];
$(selector).each(function(){
var top = $(this).position().top - 90;
if(scrollTop > top) {
var id = $(this).attr('id');
$('.nav-active').removeClass('nav-active');
$('a[href="#'+id+'"]').parent().addClass('nav-active');
}
tops.push(top);
});
});
});
Any help would be useful! Thank you :)
First of all it is a good practice to use:
$(document).ready(function(){
});
and then write your jQuery code in that function in order to assure that your script code will run after your html web page is fully loaded.
Now, I think that that should work:
$(document).ready(function() {
var topDist = $(".navHighlighter").position(); //save the position of your navbar, better use an id for that
$(document).scroll(function () {
var scroll = $(this).scrollTop();
if (scroll > topDist.top) { //when the scrolling reaches the very top of your navbar
$('.navHighlighter').addClass('scrolling');
} else {
$('.navHighlighter').removeClass('scrolling');
}
});
*rest of your code goes here*
});
Also, add:
top:0;
width: 100%;
to your .scrolling class in order to command your navbar to start just at the top of the user's window and to cover the whole width of the web page (position:fixed creates some issues on that so you have to set the width of your element, remember that).
I hope I helped and I got your demands right. Happy coding! :)
Hey Guys I found this really useful java script sticky side nav, and it works great! I don't much about js, i was just wondering if there was away to slow down the scrolling?
function redrawDotNav(){
var topNavHeight = 50;
var numDivs = $('section').length;
$('#dotNav li a').removeClass('active').parent('li').removeClass('active');
$('section').each(function(i,item){
var ele = $(item), nextTop;
console.log(ele.next().html());
if (typeof ele.next().offset() != "undefined") {
nextTop = ele.next().offset().top;
}
else {
nextTop = $(document).height();
}
if (ele.offset() !== null) {
thisTop = ele.offset().top - ((nextTop - ele.offset().top) / numDivs);
}
else {
thisTop = 0;
}
var docTop = $(document).scrollTop()+topNavHeight;
if(docTop >= thisTop && (docTop < nextTop)){
$('#dotNav li').eq(i).addClass('active');
}
});
}
$('#dotNav li').click(function(){
var id = $(this).find('a').attr("href"),
posi,
ele,
padding = $('.navbar-fixed-top').height();
ele = $(id);
posi = ($(ele).offset()||0).top - padding;
$('html, body').animate({scrollTop:posi}, 'slow');
return false;
});
demo
The line in your JavaScript code doing that is this:
$('html, body').animate({scrollTop:posi}, 'slow');
You can change the 'slow', to 'fast', and see the difference.
Learn more about the animate function here.
You can precisely control the speed on animate with duration. Here is the function signature:
animate(params, [duration], [easing], [callback])
The strings fast and slow can be supplied to indicate durations of 200ms and 600ms, respectively. The default speed is 400ms. You can adjust your speed by replacing nnn with the exact speed in milliseconds you want.
$('html, body').animate({scrollTop:posi}, nnn);