sir I want to lock my menu with div id menu fixed in top of window when scroll down the window, and also I want to set position as absolute when it scroll up I tried with this code. its doing the first job correctly. i can set the menu fixed at top of page. but it can't set the page absolute position when scroll up here is my code
<script type="application/javascript">
$(window).bind('scroll', function () {
if (window.scrollY=100){
document.getElementById("menu").style.position = "fixed";
document.getElementById("menu").style.top = "0px";
}
else if(window.scrollY < 100){
document.getElementById("menu").style.position = "absolute";
document.getElementById("menu").style.top = "100px";
}
});
</script>
You were assigning value instead of comparing window.scrollY=100
The code should be:
$(window).bind('scroll', function () {
if (window.scrollY>=100){
// ^^-----------use >= here
document.getElementById("menu").style.position = "fixed";
document.getElementById("menu").style.top = "0px";
}
else if(window.scrollY < 100){
document.getElementById("menu").style.position = "absolute";
document.getElementById("menu").style.top = "100px";
}
});
Related
I am trying to add a fadeIn to my navigation bar so when I get to a certain scroll point, the navigation bar fades in. However, my attempt is failing. I tried adding Jquery to regular javascript, so I am not sure if that is the issue or what the problem is. I am wanting the navigation bar to fadeIn only when it gets to the scroll point farther down the page where the navigation bar appears again.
This can be viewed at:
http://realtorcatch.com/test_index
My Javascript is:
window.onscroll = function() {
var scrollTop = (window.pageYOffset !== undefined) ? window.pageYOffset : (document.documentElement || document.body.parentNode || document.body).scrollTop;
if (scrollTop >= document.getElementById("d").offsetTop) {
document.getElementById("header").style.position = "fixed";
document.getElementById("d").style.marginTop = "50px";
document.getElementById("header").style.top = "0";
} else {
$(function() { // $(document).ready shorthand
$('#header').fadeIn('slow');
});
document.getElementById("header").style.position = "static";
document.getElementById("d").style.marginTop = "0px";
document.getElementById("header").style.marginTop = "0px";
}
}
Then I have the following div with all of my code in it:
<div id="header">
</div>
First, hide the header with .hide(), then the .fadeIn() call automatically removes the display: none when it fades the opacity to 100%.
$(function() { // $(document).ready shorthand
window.onscroll = function() {
var scrollTop = (window.pageYOffset !== undefined) ? window.pageYOffset : (document.documentElement || document.body.parentNode || document.body).scrollTop;
if (scrollTop >= document.getElementById("d").offsetTop) {
if (!$('#header').hasClass('header-fixed')) {
$('#header').addClass('header-fixed');
$('#header').hide().fadeIn();
document.getElementById("header").style.position = "fixed";
document.getElementById("d").style.marginTop = "50px";
document.getElementById("header").style.top = "0";
}
} else {
document.getElementById("header").style.position = "static";
document.getElementById("d").style.marginTop = "0px";
document.getElementById("header").style.marginTop = "0px";
$('#header').removeClass('header-fixed');
}
}
});
https://jsfiddle.net/jonathanzuniga/ogs9cem7/
Is Your Navigation Bar already hidden ?
Since the fadeIn() method gradually changes the opacity, for selected elements, from hidden to visible (fading effect).
If its not hidden than Please confirm weather you want to use FadeIn or FadeOut.
My site is www.to-hawaii.com. The length of the right panel is controlled by the length of the middle panel. In other words the middle panel will adjust to the length of the right panel which is naturally shorter. In some cases though the right panel is longer, see here http://www.to-hawaii.com/bg/ and this creates a strange scroll on the right. Is there a way to fix that? In other words if there is a way to have the script work like this: if the middle panel is longer than the right panel, match the right's panel width so it is as long as the middle panel and if the right panel is longer, match the middle panel's width so it is the same length as the right panel.
The function I am currently using to make the right panel width match the middle panel width is:
$(document).on('ready',function(){
if($(window).width() > 768){
var heightLeft = $(".leftpanel").height();
var heightMiddle = $(".midpanel").height();
if(heightLeft >= heightMiddle){
$(".rightpanel").css("height",heightLeft - 10);
$(".midpanel").css("height",heightLeft - 10);
}else{
$(".rightpanel").css("height",heightMiddle +2);
}
}
$(window).resize(function(){
if($(window).width() >= 768){
$(".rightpanel").css("height", "auto");
$(".midpanel").css("height", "auto");
var heightLeft = $(".leftpanel").height();
var heightMiddle = $(".midpanel").height();
if(heightLeft >= heightMiddle){
$(".rightpanel").css("height",heightLeft - 10);
$(".midpanel").css("height",heightLeft - 10);
}if(heightLeft < heightMiddle){
$(".rightpanel").css("height",heightMiddle +2);
}
}
if($(window).width() < 561){
$(".rightpanel").css("height", "auto");
$(".midpanel").css("height", "auto");
}
})
})
you could try something like this:
$(document).on('ready',function(){
var rightHeight = $('.rightPanel').height();
var leftHeight = $('.leftPanel').height();
var midHeight = $('.midPanel').height();
if (rightHeight > midHeight) {
midHeight = rightHeight;
$('.midPanel').css('height', midHeight);
}
else if (midHeight > rightHeight) {
rightHeight = midHeight;
$('.rightPanel').css('height', rightHeight);
}
// If window is resized
window.addEventListener("resize", adjustPanes);
function adjustPanes(rightHeight, midHeight) {
if (rightHeight > midHeight) {
midHeight = rightHeight;
$('.midPanel').css('height', midHeight);
}
else if (midHeight > rightHeight) {
rightHeight = midHeight;
$('.rightPanel').css('height', rightHeight);
}
}
});
Alternatively, you could set all three panels to the height of the wrapper div that you have created.
This would make them each the same length.
$(document).on('ready',function(){
var wrapperHeight = $('#wrapper').height();
$('.midPanel').height(wrapperHeight);
$('.leftPanel').height(wrapperHeight);
$('.righttPanel').height(wrapperHeight);
});
I've been trying to make my navbar stick to top when I scroll by it and achieved it. The only problem is that my content kind of kicks up when the navbar transition to position fixed is executed.
Here is an example of this behavior: http://jsfiddle.net/7HHa5/4/
JavaScript
window.onscroll = changePos;
function changePos() {
var header = document.getElementById("header");
if (window.pageYOffset > 70) {
header.style.position = "absolute";
header.style.top = pageYOffset + "px";
} else {
header.style.position = "";
header.style.top = "";
}
}
I am using bootstrap and jQuery.
How can I avoid this behavior?
When you set the header to position: absolute, it leaves an empty space which gets filled by the content. You need to add a margin to the top of the content when the header becomes fixed, like this:
window.onscroll = changePos;
function changePos() {
var header = document.getElementById("header");
var content = document.getElementById("content");
if (window.pageYOffset > 70) {
header.style.position = "absolute";
header.style.top = pageYOffset + "px";
content.style.marginTop = '55px'
} else {
header.style.position = "";
header.style.top = "";
content.style.marginTop = '0'
}
}
See http://jsfiddle.net/2EhLs/1/ for an example.
However, there is a better way.
Since you are already using Bootstrap, you should consider using the built-in Affix feature.
The best example is this one from another question:
$('#nav-wrapper').height($("#nav").height());
$('#nav').affix({
offset: { top: $('#nav').offset().top }
});
In my page, I wish to detect whether the page has vertical scrollbars, and if so, need to detect the width of the scrollbar, so I can reduce my body by the width and thus prevent my sidebar from changing location from viewing a non-scrolling page to a scrolling page.
I have the following jQuery/Javascript code:
$(document).ready(function () {
var parent, child, width;
if (width === undefined) {
parent = $('<div style="width:50px;height:50px;overflow:auto"><div/></div>').appendTo('body');
child = parent.children();
width = child.innerWidth() - child.height(99).innerWidth();
parent.remove();
}
if ($("body").height() > $(window).height()) {
//change width of body here
}
});
Unfortunately, this code doesn't work for me. Can someone please let me know where I'm going wrong?
(function($) {
$.fn.ScrollBarWidth = function() {
if (this.get(0).scrollHeight > this.height()) { //check if element has scrollbar
var inner = document.createElement('p');
inner.style.width = "100%";
inner.style.height = "200px";
var outer = document.createElement('div');
outer.style.position = "absolute";
outer.style.top = "0px";
outer.style.left = "0px";
outer.style.visibility = "hidden";
outer.style.width = "200px";
outer.style.height = "150px";
outer.style.overflow = "hidden";
outer.appendChild(inner);
document.body.appendChild(outer);
var w1 = inner.offsetWidth;
outer.style.overflow = 'scroll';
var w2 = inner.offsetWidth;
if (w1 == w2) w2 = outer.clientWidth;
document.body.removeChild(outer);
return (w1 - w2);
}
}
})(jQuery);
Runs like so :
var scrollbarWidth = $('body').ScrollBarWidth();
console.log(scrollbarWidth); //prints the scrollbar width to the console
FIDDLE
You shouldn't need to change the width of the body. By default, it's 100% of the window's width and will adjust when scrollbars appear.
However, if you can't for some reason set the width to 100%, first see if disabling the horizontal scrollbar helps you:
overflow-x: hidden;
If that doesn't cut it, use the function from here to get the scrollbar's width. Then, listen to the window resize event:
var $window = $(window),
$body = $('body');
function resize() {
if ($body.height() > $window.height()) {
$body.width($body.width() - getScrollBarWidth());
}
}
$(window).resize(resize);
I added some special features to the sidebar of my webapplication. You can see a concept of the user interface on my testing site. (It's about the right sidebar)
The sidebar stops scrolling if it is scrolled to its end.
Moreover there are selected listitems in the sidebar wich stay on the top or the bottom of the sidebar if they would scroll out of the view.
My code is written in Javascript using jQuery. Unfortunately scrolling on my page is lagging now. Here are the links to my demo page (rightclick -> show sourcecode) and its javascript file.
How can I speed up the code (and let is still abstract) ?
I paste the javascript code here for those of you who don't want to follow the links.
HTML: (example)
<ul id="right">
<li><h3>Headline</h3></li>
<li><a>Item</a></li>
<li><a>Item</a></li>
<li><a class="selected">Active Item</a></li>
<li><a>Item</a></li>
<li><h3>Headline</h3></li>
<li><a>Item</a></li>
<li><a>Item</a></li>
</ul>
Javascript:
var Scrollers = $('#content,#left,#right');
var Scrollable = new Array(Scrollers.length);
var TopOffset = new Array(Scrollers.length);
var BottomOffset = new Array(Scrollers.length);
var OuterHeight = new Array(Scrollers.length);
var OuterHeightAndOffsets = new Array(Scrollers.length);
function ScrollInit(){
Scrollers.each(function(i){
// constants
TopOffset[i] = parseInt($(this).css("margin-top").replace("px",""));
BottomOffset[i] = parseInt($(this).css("margin-bottom").replace("px",""));
OuterHeight[i] = parseInt($(this).outerHeight());
OuterHeightAndOffsets[i] = TopOffset[i] + BottomOffset[i] + OuterHeight[i];
// classes
$(this).removeClass('snapped top bottom');
if(OuterHeightAndOffsets[i] < $(window).height()){
$(this).addClass('snapped top');
Scrollable[i] = false;
} else {
Scrollable[i] = true;
}
});
}
ScrollInit();
var SelectedListitems = $('li.selected');
var SelectedListitemsActive = new Array(SelectedListitems.length); for(var i=SelectedListitems.length; i<0; i++) SelectedListitemsActive[i] = false;
function ScrollCalc(){
// list item locking
SelectedListitems.each(function(i){
if(!($(this).parent().hasClass('snapped top'))){
var ListItemOffset = $(this).offset().top - $(window).scrollTop();
var ListItemState=0; // 0:in, 1:above, 2:under
if(ListItemOffset <= $(this).parent().offset().top){ ListItemState=1; }
else if(ListItemOffset + $(this).outerHeight() >= $(window).height()){ ListItemState=2; }
// no snapped clone so far
if(ListItemState){
if(SelectedListitemsActive[i]!=true && !$(this).parent().hasClass('snapped')){
var AppendClasses = 'clone snapped '; if(ListItemState == 1) AppendClasses += 'top '; else AppendClasses += 'bottom ';
$(this).parent().append($(this).clone().addClass(AppendClasses + i));
SelectedListitemsActive[i] = true;
}
// already snapped, clone existing
} else {
if(SelectedListitemsActive[i]==true){
$('.clone.snapped.' + i).remove();
SelectedListitemsActive[i] = false;
}
}
}
});
// scroll container locking
Scrollers.each(function(i){
if(Scrollable[i]){
if($(window).scrollTop()+$(window).height() > OuterHeightAndOffsets[i]){
$(this).addClass('snapped bottom');
} else {
$(this).removeClass('snapped bottom');
}
}
});
ScrollEvent = false;
}
ScrollCalc();
$(window).scroll(function(){
ScrollCalc();
});
I've just have a look at you link and believe that the lagging is not because of your javascript. If you don't think so try to disable all scripts in window.scroll event, still lagging right?
Now try to remove all shadow properties - box-shadow and text-shadow. Also remember to disable changing shadow opacity in simple.js (changing shadow during scroll event always laggy).
Now you can see it run very fast!!! Back to css file and enable each shadow properties and find out what is most suitable for you.
There is a much faster, easier way to get the effect you want.
Try this: when the window scrolls down far enough, set your sidebar's css position property to fixed. When it scrolls up, set the position of the sidebar back to relative.
var sidebar = document.getElementById('side'),
section;
sidebar.style.position = 'relative';
sidebar.style.bottom = '0px';
sidebar.style.right = '0px';
window.onscroll = function(){
var scrollTop = document.documentElement.scrollTop || document.body.scrollTop,
maxTop = section ? section.offsetTop : sidebar.offsetHeight - window.innerHeight;
sidebar.style.top = sidebar.style.bottom = null;
if (scrollTop > maxTop) {
if (section) {
sidebar.style.top = - section.offsetTop + 'px';
} else {
sidebar.style.bottom = '0px';
}
sidebar.style.position = 'fixed';
} else {
sidebar.style.position = 'relative';
}
}
You can see it working here - http://jsfiddle.net/cL4Dy/