I have a question but I actually do not know how to ask.
I am trying to make a navigation bar stick on top when pass a point smoothly.
My reference is this -> http://blog.yjl.im/2010/01/stick-div-at-top-after-scrolling.html
My problem is when I use IE or Chrome to check it, there is a "blink" effect.
It is more like the scroll function will finish process after scroll over the point. So the things(HTML) after Nav will go on the top of the Nav on 0.1 ~ 0.3 secs then scroll function will finish process. Even through is short but it is visualize-able when the HTML over the nav.
However, If I use Firefox to check it, there is no such blink effect.....
May I ask what is the problem here I got?? What Should I check about??
My setting is a Anchor right before the Nav, Nav z-index = 99, and inside of the scroll function is below.
$(this).scrollTop() > $(anchor).offset().top
? nav.addClass('sticky')
: nav.removeClass('sticky')
jQuery(document).ready(function($) {
var my_nav = $('.navbar-sticky');
// grab the initial top offset of the navigation
var sticky_navigation_offset_top = my_nav.offset().top;
// our function that decides weather the navigation bar should have "fixed" css position or not.
var sticky_navigation = function(){
var scroll_top = $(window).scrollTop(); // our current vertical position from the top
// if we've scrolled more than the navigation, change its position to fixed to stick to top, otherwise change it back to relative
if (scroll_top > sticky_navigation_offset_top) {
my_nav.addClass( 'stick' );
} else {
my_nav.removeClass( 'stick' );
}
};
var initio_parallax_animation = function() {
$('.parallax').each( function(i, obj) {
var speed = $(this).attr('parallax-speed');
if( speed ) {
var background_pos = '-' + (window.pageYOffset / speed) + "px";
$(this).css( 'background-position', 'center ' + background_pos );
}
});
}
// run our function on load
sticky_navigation();
// and run it again every time you scroll
$(window).scroll(function() {
sticky_navigation();
initio_parallax_animation();
});
});
Related
I'm building a website with a sidebar that, once the user scrolls past a certain point it becomes fixed on the site. This code works fine.
The issue that I am coming into is that the sidebar is overlapping the footer when the user scrolls to the bottom of the page. I wrote code to detect when the bottom of the sidebar hits the same position as it's containing element - when that happens I am taking the position of the bottom of the containing element and subtract the height of the sidebar element and using that number to give the sidebar it's new "top" (while also changing the position to "absolute").
This is where I am running into the issue - once the sidebar is overtop of the footer as the user scrolls the code that is getting called alternates between the normal "fixed" position code and the "absolute" positioned code giving it this flickering effect.
For the life of me I can't figure out why the "fixed" code keeps getting called.
Here is the code:
( function( $ ) {
var sidebar_pos = $('#secondary')[0].getBoundingClientRect();
var pos_top = sidebar_pos.top + window.scrollY; //need this to get the pos of TOP in the browser - NOT the viewport
var main_pos = $('.main-content')[0].getBoundingClientRect();
var main_bottom = main_pos.bottom + window.scrollY;
var stop_pos;
var i = 0;
$(window).scroll(function(event){
var scroll = $(window).scrollTop();
var produce_pos = $('.produce')[0].getBoundingClientRect();
var pos_bottom = produce_pos.bottom + window.scrollY;
//console.log("scroll "+scroll);
//console.log("top " + pos_top);
console.log(main_bottom);
console.log('bottom ' + pos_bottom);
if( scroll >= pos_top){
if ( pos_bottom >= main_bottom ){
//if the sidebar would end up overlapping the footer
if(i == 0){
//only need to set this once, not on every scroll
stop_pos = main_bottom - $('#secondary').height() ;
}
$('#secondary').removeClass('hover').css({
position: 'absolute',
margin:0,
left: sidebar_pos.left,
top: stop_pos
});
i++;
} else {
$('#secondary').addClass('hover').css({
position: 'fixed',
left: sidebar_pos.left,
marginTop: '1.5em',
top: 20
});
setTimeout(() => {
$('*[data-widget="comet"]').addClass('active');
}, 5000);
setTimeout(() => {
$('*[data-widget="produce"]').addClass('active');
}, 7000);
}
} else if( scroll < pos_top && $('#secondary').hasClass('hover') ){ //if user scrolls up past original pos of sidebar, remove effects
$('#secondary').removeClass('hover').css({
position: 'relative',
left: 'auto',
top: 'auto'
});
i = 0;
}
});
}( jQuery ) );
I also have a codepen of the script in action.
https://codepen.io/antlaur00/pen/ExyrgYR
Any help is much appreciated! Thanks!
Well its pretty simple, just add Z-index property to your footer CSS, that way it will always overlap your sidebar .
You can refer to this article regarding the z-index property
https://www.w3schools.com/cssref/pr_pos_z-index.asp
This script makes it so when you scroll down in a browser the navigation bar disappears/hides behind the header. I was wondering if it was possible if instead it hid as soon as you scrolled down, hiding it after a user scrolls down a certain number of pixels (say 50px) to avoid touchy nav hiding on slightest scroll.
Thanks in advance for any direction.
// Nav scroll test
var prev = 0;
var $window = $(window);
var nav = $('#belowhead');
$window.on('scroll', function(){
var scrollTop = $window.scrollTop();
nav.toggleClass('hidden', scrollTop > prev);
prev = scrollTop;
});
You can put this inside your "window.on('scroll')" function:
if(scrollTop > 50) {
nav.addClass('hidden');
} else {
nav.removeClass('hidden');
}
2019 Update / Adjustment
The following could be useful for anyone else wishing to develop a header that disappears when you scroll down. I just finished making the following for a website I'm creating that required the top header to disappear when the user started scrolling, but then reappear when they start scrolling up; continuously applying this logic if you were to constantly keep scrolling up and down on the website.
For starters, a class is added to my header tag called nav-scrolled when the user scrolls past a certain point - 50px in this case. This new class can then be styled to change the background-color, add a box-shadow etc...
$(function() {
var header = $(".nav-container");
$(window).scroll(function() {
var scroll = $(window).scrollTop();
if (scroll >= 50) {
header.addClass("nav-scrolled");
} else {
header.removeClass("nav-scrolled");
}
})
});
However, this only solved the problem of not being able to edit the headers styles if the user is scrolling from the top of the page - not anywhere on the site - the following fixes this.
var userScroll;
var scrollTop = 0;
var delta = 5;
var navHeight = $('header').outerHeight();
$(window).scroll(function(event){
userScroll = true;
});
setInterval(function() {
if (userScroll) {
hasScrolled();
userScroll = false;
}
}, 250);
The next step for me was to sequentially add and remove classes show-nav and hide-nav that had been styled to display and hide the navigation menu. The following checks whether the user has scrolled (up or down) to a value higher than my delta variable. If the user is beginning to scroll up on the website, the class show-nav is added and the header transitions in from the top of the page. If the user is scrolling down the page the class hide-nav is added, and the header is hidden.
function hasScrolled() {
var st = $(this).scrollTop();
// Ensures a higher scroll than $delta
if(Math.abs(scrollTop - 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 > scrollTop && st > navHeight){
// Scroll Down
$('header').removeClass('show-nav').addClass('hide-nav');
$('.nav-toggle').removeClass('open');
$('.menu-left').removeClass('collapse');
} else {
// Scroll Up
if(st + $(window).height() < $(document).height()) {
$('header').removeClass('hide-nav').addClass('show-nav');
}
}
scrollTop = st;
}
I'm using this code to make the navigation bar stick to the top of the page after scrolling:
var nav=$('body');
var scrolled=false;
$(window).scroll(function(){
if(175<$(window).scrollTop()&&!scrolled){
nav.addClass('stuck');
$('.navigation-class').animate({marginTop:80},1000);
scrolled=true;
}
if(175>$(window).scrollTop()&&scrolled){
$('.navigation-class').animate({marginTop:0},0,function(){nav.removeClass('stuck');$('.navigation-class').removeAttr('style');});
scrolled=false;
}
});
The problem is, if the user scrolls the page up and down quickly, and the navigation is STILL animating, it will continue the animation and then suddenly jump into it's designed position, which gives a hiccup effect to the menu.
Try to scroll this page quickly to see it in live.
Is it possible to make it run smoothly like other websites?
Thanks are in order.
Edit:
After rereading the question, I realized the problem is probably that you're not cancelling the animation when the user scrolls back above 175px.
Presumably you're applying position: float to your nav element? Are you removing float as soon as the user scrolls up?
Try setting the queue option to false (see https://api.jquery.com/animate/), so the animation doesn't wait for the other one to complete.
Maybe you could try getting rid of the JQuery animation and replacing it with CSS transitions?
Maybe something like this?
var nav=$('body');
var scrolled=false;
var scrollToggle = function(){
$(window).off('scroll');
if(175<$(window).scrollTop()&&!scrolled){
nav.addClass('stuck');
$('.navigation-class').animate({marginTop:80},1000, function() {
$(window).on('scroll', scrollToggle);
);
scrolled=true;
}
else if(175>$(window).scrollTop()&&scrolled){
$('.navigation-class').animate({marginTop:0},0,function({
nav.removeClass('stuck');
$('.navigation-class').removeAttr('style');
$(window).on('scroll', scrollToggle);
});
scrolled=false;
}
};
$(window).on('scroll', scrollToggle);
I have something similar in a WIP myself. I'll post it here only slightly edited, maybe it can be useful to you.
var headerFloat = function() {
//Header
var pageHeader = $('#pageHeader'), pos = '',
headerMain = $('#headerMain'), headerMainHeight = '',
content = $('#content'), contentPadding = '',
pageTitle = $('h1.currentPage'), pageTitleTop = '';
if($(window).scrollTop() >= 95) {
pos = "fixed";
headerMainHeight = '75px';
contentPadding = '225px';
pageTitleTop = '55px';
contentHeaderTop = '130px';
}
//Header
pageHeader.css('position', pos);
headerMain.css('height', headerMainHeight);
content.css('padding-top', contentPadding);
pageTitle.css({ 'transition': 'all 0s', 'position': pos, 'top': pageTitleTop });
pageTitle[0].offsetHeight; //force "reflow" of element -- stackoverflow.com/questions/11131875/#16575811
pageTitle.css('transition', '');
};
$(document).ready(function() {
/* *** SCROLL -> FLOAT HEADER *** */
$(window).on("scroll.float", headerFloat);
});
Inputting '' (empty string) in the JQuery css function resets it to the original value. You should do that instead of .removeAttr('style');
I would also avoid the scrolled boolean. I think you need it anyway, if scrollTop < 175, you'll never be scrolled, and vice versa.
I had made back to top icon which works as it should be but the problem is it appears when i open the page but i want back to top to be appeared only after i scroll page.Thank you for your help.
Try this:
(function() {
$(window).scroll(function() {
toggleBackToTop();
});
// Show and hide back to top button
function toggleBackToTop() {
var offset = 1, // Offset position when to show
scrollTop = 0,
$btn = $('.back-to-top');
scrollTop = $(window).scrollTop();
if(scrollTop >= offset) {
$btn.fadeIn();
} else {
$btn.fadeOut();
}
}
})();
Note: Update, your button selector
For Referance:
Output: http://output.jsbin.com/nojese
Code: http://jsbin.com/nojese/edit?html,css,js
Im new to jquery.
I want to create a fixed bottom banner, and when i scroll down.. that banner will stop at the end of selected div that i want (in this case between "container-content-top" and "container-content-bottom" with smooth transition (not jumping like i did).
i already create using jquery,
<script>
$(document).ready(function(){
var topOfrel = $("#banner1").offset().top;
var topOffooter = $("#container-content-bottom").offset().top - $("#banner1").height() - $("#header-nav").height() - 120;
$(window).scroll(function(){
var y = $(window).scrollTop();
if (topOffooter > y) {
jQuery("#banner1").css("position", "fixed");
} else {
jQuery("#banner1").css("position", "static");
}
});
})
</script>
But it seems the banner will move into the position that i want (between 2 div) after certain px scroll. I already working on this for 3 days :(.
I want the banner will not fixed and change to static to the position i want with smooth transition after i scroll and responsive too.
here's my full code : http://jsbin.com/IDonagi/1/edit?html,css,output
anyone have better solution ?
Thx before guys :)
You want to trigger the switch when bottom border of browser window crosses the top position of #container-content-bottom. The correct code to determine them would be:
// topOffooter is the top offset of content after the banner.
// Have to add banner height here because its initial position is fixed,
// and therefore not counted when determining position of #container-content-bottom.
var topOffooter = $("#container-content-bottom").offset().top + $("#banner1").outerHeight();
...
// y is top offset of current bottom border of browser window
var y = $(window).scrollTop() + $(window).height();
Thanks for Leo,This is my solution for this problem,
<script>
$(document).ready(function() {
var topOfrel = $("#banner1").offset().top;
var topOffooter = $("#container-content-bottom").offset().top + $("#banner1").outerHeight();
$(window).scroll(function() {
var y = $(window).scrollTop() + $(window).height();
if (topOffooter > y) {
jQuery("#banner1").css("position", "fixed");
} else {
jQuery("#banner1").css("position", "static");
}
});
})
</script>
and for mobile device ready i simply adda this to head :
<meta name="viewport" content="user-scalable=no, width=device-width,initial-scale = 1.0,maximum-scale = 1.0" />
hope this help someone if needed :)