Javascript Page Wipe Transition with Superscrollorama - javascript

What I am trying to do is have different parts of a page slide up and cover up the previous part. I found what I wanted to do at http://johnpolacek.github.com/superscrollorama/, specifically the "Wipe It" portion. I tried copying some of the code and including the same javascript files.
In Firefox, it works. However, in Chrome and IE, when I try to scroll down, the scrollbar jitters and snaps back to the top of the page.
I don't have it up on a site, but I do have the files that I'm using: http://www.mediafire.com/?h28etrbr5t24qyw
Any help (or more practical alternatives) would be greatly appreciated.

Yea that looks pretty cool. I would just create the code from scratch so you can get it exactly how you want. I just created something real basic. A blue main div with a red div that wipes down. Obviously you can put whatever you want on both divs.. Heres the code:
<!doctype html>
<html>
<head>
<style type='text/css'>
body{
margin: 0px;
}
#wipeScreen{
position: fixed;
width: 100%;
background-color: red;
}
#mainScreen{
position: absolute;
background-color: blue;
height: 200%;
width: 100%;
}
</style>
<script type='text/javascript'>
var visHeight;
function loadConstants(){
visHeight = Math.ceil(document.getElementById("mainScreen").offsetHeight/2);
var wipeScreen = document.getElementById("wipeScreen");
wipeScreen.style.height = visHeight+"px";
wipeScreen.style.top = -visHeight+"px";
window.onscroll = runScroller;
}
function runScroller(){
document.getElementById("wipeScreen").style.top = pageYOffset-visHeight+"px";
}
</script>
</head>
<body onload='loadConstants()'>
<div id='mainScreen'></div>
<div id='wipeScreen'></div>
</body>
</html>
Copy and paste it into an HTML document and you will see what I mean

Related

How to make an alert banner have height and float?

We have an position: fixed; alert banner which appears at the top of the page to display different alerts. We want it to have a height (or appear to have height) so that it doesn't cover up the top menu of the page, but rather pushes the page content down. When the user accepts or x's out of the banner, the page should pop back to the top. When the user scrolls down the page, the banner should float at the top of the window, remaining on screen the whole time.
The current strategy is very kluge and uses a setBannerHeight() function all over the place that gives a above our banner a set height, pushing the main page content down and allowing the banner to appear to 'take up space'.
It's proven to be non future proof and does things like prevents our iOS Smart App Banners (a totally different banner) from appearing properly.
Is there a way I can either give a fixed element a height, make a sticky element float (so far I can't, this is in a self contained alert.component.ts component so don't think I can give a parent element height), OR, perhaps a 3rd party alert library you'd recommend that already has this solved?
This may help. It's simple, using position: sticky in CSS and some vanilla JavaScript. The alert stays at the top of the page when a user scrolls. It disappears when a user clicks on it.
<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<meta name="viewport" content="width=device-width, initial-scale=1">
<link rel="stylesheet" type="text/css" href="style.css">
</head>
<body>
<div id="container">
<div id="alert">Alert</div>
<nav>Menu</nav>
<section>
<p>Add enough content here so you can scroll the page.</p>
</section>
</div>
<script type="text/javascript" src="script.js"></script>
</body>
</html>
#container {
width: 600px;
margin: 0 auto;
}
nav {
width: 600px;
height: 100px;
background: lightblue;
}
#alert {
width: 600px;
height: 40px;
position: sticky;
top: 0;
background: orangered;
cursor: pointer;
}
section {
width: 600px;
}
const alert = document.getElementById("alert");
alert.addEventListener("click", function() {
alert.style.position = "static";
alert.style.display = "none";
})
One way to do it is by toggling a CSS class to the <body> that matches the state of the alert (open or closed). This class affects the behavior of the body, specifically his top-padding which should equal the height of alert.
Now all you have to worry about is to toggle the class on the proper show/hide events of the alert component.
body.alert-on {
padding-top: 60px;
}
.alert {
position: fixed;
}

Use .animate to scroll text

I'm trying to create something similar this web page, where a video is used as the background and as the user scrolls up and down the text/background video change appropriately so as to tell a story.
Right now getting the video to play is about the only thing working. The video will load, and play, as intended. However the <div> elements are simply stacked below the video one by one. When the user clicks anywhere on the page, I'd like the text to scroll up, from the bottom, and finish scrolling once they reach the same position on the page as the previous text... however I don't think I'm using the .animate() function properly.
This seems like it'd be relatively easy to do, so here's my admittedly weak first attempt.
fiddle: http://jsfiddle.net/f06w76bv/
<!DOCTYPE html>
<html>
<head>
<style>
.textConatiner{
position: absolute;
background-color: rgba(0, 0, 0, 0.9);
color: #fff;
left:10%;
}
video.bgvid{
position: fixed;
right: 0;
bottom: 0;
min-width: 100%;
min-height: 100%;
width: auto;
height: auto;
z-index: -100;
background: url(TurbineStill.png) no-repeat;
background-size: cover;
}
</style>
</head>
<body>
<video autoplay loop poster="TurbineStill.png" class="bgvid">
<source src="Turbine.mp4" type="video/mp4">
</video>
<section>
<div class="textConatiner" id="one" style="top:50%;">
<h2>Video Backgrounds One</h2>
</div>
</section>
<section>
<div class="textConatiner" id="two" style="top:150%;">
<h2>Video Backgrounds One</h2>
</div>
</section>
</body>
<script src="js/jquery-1.11.1.js"></script>
<script>
$(document).ready(function () {
$(document).click(function () {
var myDiv = $("#two");
var scrollto = myDiv.offset().top + (myDiv.height() / 2);
myDiv.animate({ scrollTop: scrollTo }, 1000);
});
});
</script>
</html>
EDIT
By adding the position to the div container I'm able to get the original div positions exactly where I want them when the page loads. However, I still cannot get the animate method to move the second div into the page from below.
Your question isn't exactly new, it's just a bunch of questions in one really.
First of all - for your positioning, you'll be able to use plain CSS like you would with any DOM element. Tutorial on that are at W3Schools for example.
Scrolling to an Element using JQuery is answered in this stackoverflow-Question.
And another stackoverflow-question about moving a video by scrolling can be found here.

jqModal not working

I was trying to test out some working code from http://dev.iceburg.net/jquery/jqModal/ to get an idea of how this works, but I am unable to get the code to work. I'm trying to use the pop up dialog box part, and I am testing the code from the defaults, which is the first example, in the examples section. here is what I had copied and tried testing out. the part that is not working is the dialog box popping up. i receive an error say.... Uncaught ReferenceError: $ is not defined
<html>
<head>
<title> test </title>
<style type = "text/css">
.jqmWindow {
display:none;
position: fixed;
top: 17%;
left: 50%;
margin-left: -300px;
width: 600px;
background-color: #EEE;
color: #333;
border: 1px solid black;
padding: 12px;
}
.jqmOverlay { background-color: #000; }
# html .jqmWindow {
position: absolute;
top: expression((document.documentElement.scrollTop || document.body.scrollTop) + Math.round(17 * (document.documentElement.offsetHeight || document.body.clientHeight) / 100) + 'px');
}
</style>
<script type = "text/javascript">
$().ready(function() {
$('#dialog').jqm();
});
</script>
</head>
<body>
view
...
<div class="jqmWindow" id="dialog">
Close
<hr>
<em>READ ME</em> -->
This is a "vanilla plain" jqModal window. Behavior and appeareance extend far beyond this.
The demonstrations on this page will show off a few possibilites. I recommend walking
through each one to get an understanding of jqModal <em>before</em> using it.
<br /><br />
You can view the sourcecode of examples by clicking the Javascript, CSS, and HTML tabs.
Be sure to checkout the documentation too!
<br /><br />
<em>NOTE</em>; You can close windows by clicking the tinted background known as the "overlay".
Clicking the overlay will have no effect if the "modal" parameter is passed, or if the
overlay is disabled.
</div>
</body>
</html>
If your code is indeed your entire HTML, then the reason $ is not defined is that you have not included jQuery (which defines $ and uses it a lot as shorthand). Your code includes neither the jQuery library nor the jqModal script. (Admittedly all of the examples on the jqModal site are extracts rather than full code so they take this step for granted.)
Add
<script type="text/javascript" src="http://ajax.googleapis.com/ajax/libs/jquery/1.8.3/jquery.min.js"></script>
<script type="text/javascript" src="/assets/js/jqModal.js"></script>
in your <head>, adjusting the path for jQModal.js as appropriate.

Displaying placeholder HTML when Javascript is disabled

I need to display a banner in a my HTML file when java script is disabled as in stackoverflow site. In stackoverflow site, it is displayed a red banner when java script is disabled. It is good to whole HTML page goes little bit down and display a red message as in this stackoverflow site when JS is disabled. Can any one help me to do this..
Thanks in advance..
Use <noscript> tag:
https://developer.mozilla.org/en/HTML/Element/noscript
I don't know if it's still the way to do it, but noscript works for that.
<noscript>Javascript is disabled</noscript>
So I suppose that a specific div inside the noscript should do the job.
<html>
<head>
<title>noscript test</title>
<style>
#nojs {
top: 0px;
width: 100%;
position: absolute;
background-color: red;
color: white;
border-bottom: solid 5px black;
}
</style>
</head>
<body>
<noscript><div id="nojs">You should enable javascript!!</div></noscript>
</body>
</html>
Display the banner and hide it with JavaScript. Thus it is shown if JavaScript is not enabled!
For example
<img src="myimage.gif" id="myImage" />
<script type="text/javascript">
window.onload = function(){
document.getElementById("myImage").style.display="none";
}
</script>

"overflow:hidden" invalid in ie

<html>
<head>
<style>
html{ overflow:hidden;}
body{ overflow:hidden; height:100%; background-color:blue; margin:0px;}
div{ height:3000px; background-color:red; margin:30px;}
</style>
</head>
<body>
<div>dasdasd</div>
</body>
</html>
Here is the html code. When it running on a standard browser, the div tag keep showing in the window.
But it run in ie, when you select the words "dasdasd" and drag down, the body tag will scroll and the words "dasdasd" will hide unless you disable the select function.
Could someone give me other solution?
Like Spudley's answer,the DOCTYPE cause the problem,but when in the standard mode,the body tag still scroll, anyone can solve the problem?
The problem is that you're missing the <!DOCTYPE> declaration.
When IE sees HTML code without a DOCTYPE, it goes into quirks mode.
In quirks mode, the browser is effectively rendering the page to be backward compatible with IE5. It changes the way it renders the basic box layout, and removes support for a lot of standard CSS.
Add the following doctype to the top of your page (above the <html> tag), and you should see things come right:
<!DOCTYPE html>
Try this:
body {
background-color: blue;
height: 100%;
margin: 0 auto;
overflow: auto;
}
div {
background-color: red;
margin: 30px;
overflow: auto;
}
Hope it works...Best Luck.

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