Script not working properly when page refreshed - javascript

I have the code of a scroll to top button as you can see at Jsfiddle The problem with the code is that at the time the page is loaded the button is displayed (which it should not, it should be displayed when the person scrolls below). Once scrolled down, on scrolling up the issue no longer prevails, the button vanishes at the top as it should. Refreshing the page again would let us see the button again without any scrolling down.
Since I am a javascript noob, I don't know what I am doing wrong.
<div class="scroll-top" style="display: block;">
<img src="data:image/svg+xml;utf8;base64,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" />
<span class="flame"></span>
<span class="flame"></span>
<span class="flame"></span>
</div>
<style>
.scroll-top img{
height:45px;
margin: -12px 0 0 5px;
border:0;
}
.scroll-top {height: 60px; width: 60px; position: fixed; bottom: 100px; right: 30px; display: none; z-index: 9999;}.scroll-top:hover{animation-delay:0s;animation-duration:.1s;animation-iteration-count:infinite;animation-name:shake-little;animation-play-state:running;animation-timing-function:ease-in-out}.scroll-top .flame{-moz-border-bottom-colors:none;-moz-border-left-colors:none;-moz-border-right-colors:none;-moz-border-top-colors:none;border-color:#ffda44 transparent transparent;border-style:solid;border-width:25px 3px 3px;display:none;height:0;left:-4px;margin:-5px auto 0;position:absolute;right:0;top:66%;width:0}.scroll-top .flame+.flame{border-width:10px 2px 2px;left:20px;margin:0}.scroll-top .flame+.flame+.flame{border-width:10px 2px 2px;left:auto;margin:0;right:24px}.scrolling .flame{display:block}.nav-toggle,.owl-item .quote-icon,.price-box .price-box-head-shadow,.scroll-top .flame{transition:all .5s cubic-bezier(.25,.1,.25,1) 0s}#keyframes shake-little{0%{transform:translate(0,0) rotate(0)}14%,16%,2%,20%,24%,30%,48%,52%,54%,76%,8%,84%,86%,88%,92%,96%,98%{transform:translate(0,0) rotate(-.5deg)}10%,12%,22%,32%,4%,42%,44%,64%,72%,80%,90%{transform:translate(-1px,0) rotate(-.5deg)}18%,34%,36%,46%,6%,66%,68%,70%,74%,82%,94%{transform:translate(0,-1px) rotate(-.5deg)}26%,28%,38%,40%,50%,56%,58%,60%,62%,78%{transform:translate(-1px,-1px) rotate(-.5deg)}}
</style>
<script type="text/javascript">
// Scroll to top button
wnHeight = jQuery(window).height();
//Check to see if the window is top if not then display button
jQuery(window).scroll(function(){
if (jQuery(this).scrollTop() > wnHeight/2) {
jQuery('.scroll-top').fadeIn();
} else {
jQuery('.scroll-top').fadeOut().removeClass('scrolling');
}
});
//Click event to scroll to top
jQuery('.scroll-top').click(function(){
jQuery('html, body').animate({scrollTop : 0},800);
jQuery(this).addClass('scrolling');
});
</script>
Thanks.

Initialize the button with display: none (in CSS) and it doesn't how at the start of the script
.scroll-top { display: none; }
Then it works with your javascript code.
See it working: https://jsfiddle.net/0d5188ry/2/

Related

In-page anchors not working properly in combination with "scroll-then-fix" JS navbar code

I use this nice little JavaScript to make my navigation bar (which is normally sitting 230px down from the top) stick to the top of the page once the page is scrolled down that 230 px. It then gives the "nav" element a "fixed" position.
$(document).ready(function() {
$(window).bind('scroll', function() {
if ($(window).scrollTop() > 230) {
$('nav').addClass('fixed');
} else {
$('nav').removeClass('fixed');
}
});
});
nav {
width: 90%;
display: flex;
justify-content: center;
max-width: 1400px;
height: 85px;
background-color: rgba(249, 241, 228, 1);
margin: auto;
border-top-left-radius: 0em;
border-top-right-radius: 0em;
border-bottom-left-radius: 2em;
border-bottom-right-radius: 2em;
}
.fixed {
position: fixed;
border-top: 0;
top: 0;
margin: auto;
left: 0;
right: 0;
z-index: 4;
}
<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
<nav>
<ul>
<li>One</li>
<li>Two</li>
<li>Three</li>
<li>Four</li>
</ul>
</nav>
Now, the problem: i have positioned the corresponding anchor targets
within the page and have given them some "padding-top" to account for the fixed navbar (about 90px), so that they don't disappear behind the bar when the page jumps to them after clicking.
.anchor {
padding-top: 90px;
}
<a class="anchor" id="three">
This works fine AS LONG AS the navbar is already fixed to the top.
But if you click on a link while the navbar is still in its original mid-page position (e.g. the first click the user will do), it just disregards the offset i gave the anchor target and jumps to a weird position where the anchor target is hidden behind the navbar (and not even aligned with the top of the page)!
If i THEN click on the link again (now in the fixed bar on top of the page), it corrects itself and displays the page as i want to. But that first click always misses - i can't figure out why! Please help
EDIT: WORKING DEMO here: http://www.myway.de/husow/problem/problem.html
1st Add a new class name spacebody to your first div with class="space"
<nav>
...
</nav>
<div class="space spacebody">
</div>
2nd JS use the following should fix your problem:
$(document).ready(function() {
$(window).bind('scroll', function() {
if ($(window).scrollTop() > 230) {
$('nav').addClass('fixed');
$('.spacebody').css('margin-top', '85px');
} else {
$('nav').removeClass('fixed');
$('.spacebody').css('margin-top', '0px');
}
});
});
Reason Why?
because when your nav is not fixed, it has a height of 85px, when you scroll down it has no height which is 0 height. Then everything below move up by 85px causing your to go below the target of ONE or TWO etc. It is not you are missing the first click, it is when the nav are not fixed and the click you will be scroll more down by 85px. If you scroll to top and click you will miss again.
You can easily see this if you change your CSS for nav with background-color: transparent;
With the code above should fix it when you nav become fixed to add a margin-top as 85px to the div below so they keep the same height as you clicked.

Div should appear when user scrolls down and back up again, but not on load

I'm a complete novice at javascript so this will probably be really easy for you.My website (http://www.pjsmusic.com) requires a div of 200px when the user scrolls 40px down the page to appear. I have added some javascript
$(document).scroll(function() {
$('#jerkBox').toggle($(this).scrollTop()> 40);
});
However, the div appears when the page loads even as the page isn't scrolled from the top at all. How could I make this div appear when the user scrolls 40px, and disappear when they scroll back up the page past 40px, but not appear on load? You'll see what I mean if you visitthe link. Thanks in advance!
JQuery .toggle() controls the display property of the element. You can set it as display: none on the css right from the start:
#jerkBox {
display: none;
}
$(document).scroll(function() {
$('#jerkBox').toggle($(this).scrollTop()> 40);
});
#jerkBox {
float: right;
width: 200px;
height: 200px;
background: red;
display: none;
}
<script src="https://ajax.googleapis.com/ajax/libs/jquery/1.11.1/jquery.min.js"></script>
<div id="jerkBox">
jerkBox div
</div>
<div style="height: 2000px">
</div>
You just have to hide #jerkBox by default. Either in the CSS style of the element, set it to display: none or hide it immediately on document ready in your script.
/* CSS */
#jerkBox {
display: none;
}
or
/* JavaScript */
$(document).ready(function() {
$('#jerkBox').hide();
}

How do I make the rest of the page fade to black once my div loads and fade out once the div is closed?

I've been piecing together code and tweeking it to eventually come together with this. The code itself is fairly simple and basically just saying that once someone visits the page for the first time then drop a cookie and no longer display it for the visitor when he visits the page, well for 365 days. My only issue is that once the div loads and loads out, I can't figure out how to fade in and fade out the background, I can only fade the div itself. I've tried wrapping it in a overlay div but I think I'm approaching it all wrong.
The code looks a bit much on here so I've attached a jsfiddle for a working example: http://jsfiddle.net/newbieturd/F29uv/
** Note: Once you run the fiddle once, you will have to clear your cookie. The DIV only appears once
CSS:
#welcome {
box-sizing:border-box;
padding:34px 18px 18px 18px;
height:120px;
width:300px;
background:Salmon;
color:#f9f9f9;
border-radius:6px;
position:absolute;
top:50%;
left:50%;
margin:-60px 0 0 -150px;
font:300 normal 1.4em/1.2 'Signika', sans-serif;
display:none;
}
#close {
height:30px;
width:30px;
background:url('http://www.omagdigital.com/images/articles/WebArticle-CloseButton.png') no-repeat;
position:absolute;
top:2px;
right:2px;
cursor:pointer;
}
JS:
<script type='text/javascript'>//<![CDATA[
$(window).load(function(){
(function(factory){if(typeof define==='function'&&define.amd){define(['jquery'],factory);}else{factory(jQuery);}}(function($){var pluses=/\+/g;function raw(s){return s;}function decoded(s){return decodeURIComponent(s.replace(pluses,' '));}function converted(s){if(s.indexOf('"')===0){s=s.slice(1,-1).replace(/\\"/g,'"').replace(/\\\\/g,'\\');}try{return config.json?JSON.parse(s):s;}catch(er){}}var config=$.cookie=function(key,value,options){if(value!==undefined){options=$.extend({},config.defaults,options);if(typeof options.expires==='number'){var days=options.expires,t=options.expires=new Date();t.setDate(t.getDate()+days);}value=config.json?JSON.stringify(value):String(value);return(document.cookie=[config.raw?key:encodeURIComponent(key),'=',config.raw?value:encodeURIComponent(value),options.expires?'; expires='+options.expires.toUTCString():'',options.path?'; path='+options.path:'',options.domain?'; domain='+options.domain:'',options.secure?'; secure':''].join(''));}var decode=config.raw?raw:decoded;var cookies=document.cookie.split('; ');var result=key?undefined:{};for(var i=0,l=cookies.length;i<l;i++){var parts=cookies[i].split('=');var name=decode(parts.shift());var cookie=decode(parts.join('='));if(key&&key===name){result=converted(cookie);break;}if(!key){result[name]=converted(cookie);}}return result;};config.defaults={};$.removeCookie=function(key,options){if($.cookie(key)!==undefined){$.cookie(key,'',$.extend({},options,{expires:-1}));return true;}return false;};}));
function setCookie() {
$.cookie("visited", "true", { expires: 365 });
}
if ($.cookie('visited') != 'true') {
$('#welcome').show(1800);
setCookie();
} else {
$('#welcome').remove();
}
$('#close').click(function() {
$('#welcome').hide(1800);
});
// $.cookie("visited", null);
});//]]>
</script>
HTML:
<div id="welcome">
<span id="close"></span>
Interstitial Message. You will only see this message once every 365 days.
</div>
<p> Hello World. </p>
Is this what you are looking for? I gave the popup a parent container that will serve as the overlay.
HTML:
<div class="overlay">
<div id="welcome">
<span id="close"></span>
This is the only time you will see this message :)
</div>
</div>
CSS:
.overlay {
position: absolute;
top: 0;
left: 0;
width: 100%;
height: 100%;
background: rgba(0, 0, 0, 0.4);
z-index: 99;
}
jQuery:
if ($.cookie('visited') != 'true') {
$('#welcome, .overlay').show(100); // If the condiditon is true then show overlay
setCookie();
} else {
$('#welcome').remove();
}
$('#close').click(function() {
$('#welcome').hide(100); // Can also be added to this jQuery selector but the animation was odd
$('.overlay').fadeOut(100); // Fades out on click
});
Finally the fiddle: DEMO
Give your #welcome div a z-index (11 for example) and add css to give your document body full height and width:
html, body {
height: 100%;
width: 100%;
}
You're going to add a glass pane div to the body and it needs a height and width to fill the body of the page which, in your current example, has no height or width set
And then add a background div with a color of your choosing and a z-index less than your #welcome div such as:
<div id="glass_pane" style="width: 100%; height: 100%; z-index: 10; position: absolute: top: 0px; left: 0px; background-color: #000;"></div>
Ans then fade it in or out, remove it when you like, change the transparency

Disable scrolling while popup active

I created a jQuery popup by following an online tutorial (http://uposonghar.com/popup.html).
Due to my low knowledge on jQuery I am not able to make it work as of my requirements.
My problem:
I want to disable scroll of webpage while popup is active.
Background fade color of popup while active is not working on full webpage.
CSS:
body {
background: #999;
}
#ac-wrapper {
position: absolute;
top: 0;
left: 0;
width: 100%;
height: 100%;
background: rgba(255,255,255,.6);
z-index: 1001;
}
#popup{
width: 555px;
height: 375px;
background: #FFFFFF;
border: 5px solid #000;
border-radius: 25px;
-moz-border-radius: 25px;
-webkit-border-radius: 25px;
box-shadow: #64686e 0px 0px 3px 3px;
-moz-box-shadow: #64686e 0px 0px 3px 3px;
-webkit-box-shadow: #64686e 0px 0px 3px 3px;
position: relative;
top: 150px; left: 375px;
}
JavaScript:
<script type="text/javascript">
function PopUp(){
document.getElementById('ac-wrapper').style.display="none";
}
</script>
HTML:
<div id="ac-wrapper">
<div id="popup">
<center>
<p>Popup Content Here</p>
<input type="submit" name="submit" value="Submit" onClick="PopUp()" />
</center>
</div>
</div>
<p>Page Content Here</p>
A simple answer, which you could use and would not require you to stop the scroll event would be to set the position of your #ac-wrapper fixed.
e.g.
#ac-wrapper {
position: fixed;
top: 0;
left: 0;
width: 100%;
height: 100%;
background: rgba(255,255,255,.6);
z-index: 1001;
}
this will keep the container of the popup always visible (aligned top - left) but would still allow scrolling.
But scrolling the page with a popup open is BAD!!! (almost always anyway)
Reason you would not want to allow scrolling though is because if your popup isn't fullscreen or is semi transparent, users will see the content scroll behind the popup. In addition to that, when they close the popup they will now be in a different position on the page.
A solution is that, when you bind a click event in javascript to display this popup, to also add a class to the body with essentially these rules:
.my-body-noscroll-class {
overflow: hidden;
}
Then, when closing the popup by triggering some action or dismissing it with a click, you simply remove the class again, allowing scroll after the popup has closed.
If the user then scrolls while the popup is open, the document will not scroll. When the user closes the popup, scrolling will become available again and the user can continue where they left off :)
To disable scrollbar:
$('body').css('overflow', 'hidden');
This will hide the scrollbar
Background-fade-thing:
I created my own popup-dialog-widget that has a background too. I used the following CSS:
div.modal{
position: fixed;
margin: auto;
top: 0;
bottom: 0;
left: 0;
right: 0;
z-index: 9998;
background-color: #000;
display: none;
filter: alpha(opacity=25); /* internet explorer */
-khtml-opacity: 0.25; /* khtml, old safari */
-moz-opacity: 0.25; /* mozilla, netscape */
opacity: 0.25; /* fx, safari, opera */
}
I had a similar problem; wanting to disable vertical scrolling while a "popup" div was displayed.
Changing the overflow property of the body does work, but also mess with the document's width.
I opted jquery to solve this using and used a placeholder for the scrollbar.
This was done without binding to the scroll event, ergo this doesn't change your scrollbar position or cause flickering :)
HTML:
<div id="scrollPlaceHolder"></div>
CSS:
body,html
{
height:100%; /*otherwise won't work*/
}
#scrollPlaceHolder
{
height:100%;
width:0px;
float:right;
display: inline;
top:0;
right: 0;
position: fixed;
background-color: #eee;
z-index: 100;
}
Jquery:
function DisableScrollbar()
{
// exit if page can't scroll
if($(document).height() == $('body').height()) return;
var old_width = $(document).width();
var new_width = old_width;
// ID's \ class to change
var items_to_change = "#Banner, #Footer, #Content";
$('body').css('overflow-y','hidden');
// get new width
new_width = $(document).width()
// update width of items to their old one(one with the scrollbar visible)
$(items_to_change).width(old_width);
// make the placeholder the same width the scrollbar was
$("#ScrollbarPlaceholder").show().width(new_width-old_width);
// and float the items to the other side.
$(items_to_change).css("float", "left");
}
function EnableScrollbar()
{
// exit if page can't scroll
if ($(document).height() == $('body').height()) return;
// remove the placeholder, then bring back the scrollbar
$("#ScrollbarPlaceholder").fadeOut(function(){
$('body').css('overflow-y','auto');
});
}
Hope this helps.
If simple switching of body's 'overflow-y' is breaking your page's scroll position, try to use these 2 functions (jQuery):
// Run this function when you open your popup:
var disableBodyScroll = function(){
window.body_scroll_pos = $(window).scrollTop(); // write page scroll position in a global variable
$('body').css('overflow-y','hidden');
}
// Run this function when you close your popup:
var enableBodyScroll = function(){
$('body').css('overflow-y','scroll');
$(window).scrollTop(window.body_scroll_pos); // restore page scroll position from the global variable
}
Use below code for disabling and enabling scroll bar.
Scroll = (
function(){
var x,y;
function hndlr(){
window.scrollTo(x,y);
//return;
}
return {
disable : function(x1,y1){
x = x1;
y = y1;
if(window.addEventListener){
window.addEventListener("scroll",hndlr);
}
else{
window.attachEvent("onscroll", hndlr);
}
},
enable: function(){
if(window.removeEventListener){
window.removeEventListener("scroll",hndlr);
}
else{
window.detachEvent("onscroll", hndlr);
}
}
}
})();
//for disabled scroll bar.
Scroll.disable(0,document.body.scrollTop);
//for enabled scroll bar.
Scroll.enable();
https://jsfiddle.net/satishdodia/L9vfhdwq/1/
html:-
Open popup
Popup
pop open scroll stop now...when i will click on close automatically scroll running.
close
**css:-**
#popup{
position: fixed;
background: rgba(0,0,0,.8);
display: none;
top: 20px;
left: 50px;
width: 300px;
height: 200px;
border: 1px solid #000;
border-radius: 5px;
padding: 5px;
color: #fff;
}
**jquery**:-
<script type="text/javascript">
$("#open_popup").click(function(){
$("#popup").css("display", "block");
$('body').css('overflow', 'hidden');
});
$("#close_popup").click(function(){
$("#popup").css("display", "none");
$('body').css('overflow', 'scroll');
});
</script>
I had the same problem and found a way to get rid of it, you just have to stop the propagation on touchmove on your element that pops up. For me, it was fullscreen menu that appeared on the screen and you couldn't scroll, now you can.
$(document).on("touchmove","#menu-left-toggle",function(e){
e.stopPropagation();
});
This solution works for me.
HTML:
<div id="payu-modal" class="modal-payu">
<!-- Modal content -->
<div class="modal-content">
<span class="close">×</span>
<p>Some text in the Modal..</p>
</div>
</div>
CSS:
.modal-payu {
display: none; /* Hidden by default */
position: fixed; /* Stay in place */
z-index: 1; /* Sit on top */
padding-top: 100px; /* Location of the box */
left: 0;
bottom: 0;
width: 100%; /* Full width */
height: 100%; /* Full height */
overflow: auto; /* Enable scroll if needed */
background-color: rgb(0,0,0); /* Fallback color */
background-color: rgba(0,0,0,0.4); /* Black w/ opacity */
}
/* Modal Content */
.modal-content {
background-color: #fefefe;
margin: auto;
padding: 20px;
border: 1px solid #888;
width: 80%;
}
/* The Close Button */
.close {
color: #aaaaaa;
float: right;
font-size: 28px;
font-weight: bold;
}
.close:hover,
.close:focus {
color: #000;
text-decoration: none;
cursor: pointer;
}
JS:
<script>
var btn = document.getElementById("button_1");
btn.onclick = function() {
modal.style.display = "block";
$('html').css('overflow', 'hidden');
}
var span = document.getElementsByClassName("close")[0];
var modal = document.getElementById('payu-modal');
window.onclick = function(event) {
if (event.target != modal) {
}else{
modal.style.display = "none";
$('html').css('overflow', 'scroll');
}
}
span.onclick = function() {
modal.style.display = "none";
$('html').css('overflow', 'scroll');
}
</script>
I ran into the problem and tried several solutions,
here is the article that solved my problem (https://css-tricks.com/prevent-page-scrolling-when-a-modal-is-open/) and it is quite simple!
It uses the 'fixed body' solution, which is quite common to find in lots of posts.
The problem with this solution is, when the popup is closed, the body will scroll back to the top.
But the article points out: by manipulating the CSS top and position attributes while using the solution, we can recover the scroll position.
Another issue of the solution is, you can't apply the solution with the multiple popup scenario.
So I added a variable to store the count of the popup, just to make sure the program won't trigger the initiating process nor the reset process at the wrong timing.
Here is the final solution I get:
// freeze or free the scrolling of the body:
const objectCountRef = { current: 0 }
function freezeBodyScroll () {
if (objectCountRef.current === 0) { // trigger the init process when there is no other popup exist
document.body.style.top = `-${window.scrollY}px`
document.body.style.position = 'fixed'
}
objectCountRef.current += 1
}
function freeBodyScroll () {
objectCountRef.current -= 1
if (objectCountRef.current === 0) { // trigger the reset process when all the popup are closed
const scrollY = document.body.style.top
document.body.style.position = ''
document.body.style.top = ''
window.scrollTo(0, parseInt(scrollY || '0') * -1)
}
}
You can also see the demo on my Codepen: https://codepen.io/tabsteveyang/pen/WNpbvyb
Edit
More about the 'fixed body' solution
The approach is mainly about setting the CSS position attribute of the body element into 'fixed' to make it unscrollable.
No matter how far it has been scrolled, when the body is fixed, it will scroll back to the top, which is the behavior that I don't expect to see. (Imagine the user is browsing a long content and almost scrolls to the bottom of the page, suddenly a popup shows up and make the page scroll right back to the top, that's a bad user experience)
The solution from the article
Base on the 'fixed body' approach, additionally, the solution sets the CSS top of the body as the value of '-window.scrollY px' to make the body looks like it stays in the current scrolling position while it is fixed.
Furthermore, the solution uses the CSS top of the body as a temporary reference, so that we can retrieve the scrolling position by the attribute when we want to make the body scrollable again. (Notice you have to multiple the position you get to -1 to make it positive)

Place animated footer under other divs

so I wanted an animated footer for my webpage using jquery. There's supposed to be a button which should trigger the animation. I found a nice example for all this, and everything is fine and dandy. Except that the button (including the footer) has this code that makes it stick to the bottom of your web browser, rather than to the bottom of the page. I do [i]not[/i] want it to, like, "scroll" along with the page, I realy want it to be underneath all my other divs. I tried putting it in the div container (which has all my other divs in it as well), but that doesn't seem to work.
Now, (after 2.5 hours of googling) I found out that it might/may/could have something to do with "absolute" positioning in the CSS, so I tried switching some things around such as giving the footer's container a relative position or giving it an "overflow: hidden;" along with the rest a left float but nothing seemed to solve my problem. (I could've done something wrong, not that great with CSS after all :-/)
I hope someone is able/willing to help.
P.S. Here's the example I used:
http://return-true.com/2010/04/jquery-pop-up-footer-version-2/
and here's the code:
Javascript:
jQuery(function($) {
var open = false;
$('#footerSlideButton').click(function () {
if(open === false) {
$('#footerSlideContent').animate({ height: '300px' });
$(this).css('backgroundPosition', 'bottom left');
open = true;
} else {
$('#footerSlideContent').animate({ height: '0px' });
$(this).css('backgroundPosition', 'top left');
open = false;
}
});
});
HTML:
<div id="footerPlacement">
<div id="footerSlideContainer">
<div id="footerSlideButton"></div>
<div id="footerSlideContent">
<div id="footerSlideText">
<h3>Hey! I'm a Sliding Footer</h3>
<p>What's a Sliding Footer? Well I'm a cool little element which can be hidden from view, and revealed when the user wants to see me.</p>
<p>What can you use me for? Well look at all this stuff:</p>
<ul>
<li>Sales information</li>
<li>Important updates</li>
<li>Unobtrusive about panel</li>
<li>Or just a good ol' footer</li>
</ul>
<p>There are obviously many other uses, but these are the few useful ones I can think of.</p>
</div>
</div>
</div>
</div>
CSS:
#footerPlacement {
margin-bottom: 0px;
width: 1000px;
margin-left: auto;
margin-right: auto;
}
#footerSlideContainer {
position: fixed;
margin-left: 0px;
bottom:0px;
width: 1000px;
}
#footerSlideButton {
background: url('../images/footer/footerbtn.png') top left no-repeat transparent;
position: absolute;
top: -55px;
right: 20px;
width:50px;
height:50px;
border: none;
cursor: pointer;
}
#footerSlideContent {
width: 100%;
height: 10px;
background: #251b15;
color: #CCCCCC;
font-size: 0.8em;
border: none;
font-family: DejaVuSansBook, Sans-Serif;
}
#footerSlideText {
padding: 15px 10px 25px 25px;
}
Thanks in advance!
if you change your #footerPlacement to include position:relative, you can change #footerSlideContainer to be position:absolute and then your footer will sit below any content above it.
However you will need to make the content have a min-height of around 350px for the footer to work properly and if your content isn't long enough, the footer won't be at the bottom of the browser.
I also added overflow:hidden to #footerSlideContent. I have made a fiddle to demonstrate:
http://jsfiddle.net/tc6b8/

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