Pure CSS parallaxing (not fixed) background for single row in layout - css

I'm wondering if it's possible to use only CSS to create a parallax scrolling background that meets the following specifications.
It works on an element that sits inside an otherwise static layout (i.e. my whole page layout isn't a group of parallaxing items)
The background isn't entirely fixed in place; it moves, just not as fast as the rest of the page.
I've looked up tons of tutorials for parallaxing backgrounds, and have found some seemingly great tutorials, but they all have one of the following problems.
They rely on the whole page being a parallax group so that you're actually scrolling over a container via an "overflow: auto" specification
The background is totally fixed in place
they use JavaScript.
Sooo, I can accomplish what I want with JavaScript fairly easily. Here's a full working example on JSFiddle that you can try out.
CSS
.parallax-row {
background-image: url(http://lorempixel.com/output/nature-q-c-781-324-3.jpg);
background-size: auto 150%;
}
JavaScript
/**
* Update the parallaxing background img to partially scroll
*/
jQuery(document).ready(function($) {
$(window).on('scroll', function() {
$('.parallax-row').each(function(index, el) {
var $el = $(el);
var fromTop = $el.offset().top + ($el.outerHeight() / 2) - $(window).scrollTop();
var windowHeight = $(window).height();
var percent = (fromTop * 100 / windowHeight);
$el.css('background-position', '0 ' + percent + '%');
});
});
});
Is it possible to accomplish that same effect with just CSS?

Related

Footer at bottom of page (not sticky) even when there's little content

I'm new to SO, but I've been learning to code for the past couple years. I just launched my webpage and everything looks good except for the About/Contact page.
There isn't enough content for the footer to stick to the bottom and the Sticky Footer code makes it always present. I only want it to be at the bottom of the page and underneath content. It looks fine on small browsers but not on larger screens or when you zoom out.
Positioning absolute and fixed doesn't work, and bottom: 0 doesn't work either. I'm running out of ideas on how to stick it to the bottom.
Any ideas???
Here's my site: http://yasminpanjwani.com/aboutcontact.html
Thanks!
You could calculate the height of the viewport and set a min-height to your main element
If your using jQuery
$(document).ready(function() {
var viewportHeight = $(document).height();
$('main').css('min-height', viewportHeight - 200 ); // minus size of your header & footer
});
If not;
var $main = document.getElementsByTagName('main'),
body = document.body,
html = document.documentElement;
var height = Math.max(
body.scrollHeight, body.offsetHeight, html.clientHeight, html.scrollHeight, html.offsetHeight
);
$main.style.minHeight = height + 'px';

Full Height gmap in primefaces

I'm using primefaces ronin theme and I'm trying to make a full screen gmap no matter what the resolution of the screen is. how ever, unless I state the height in pixels, it won't work.
for example, if i set the height css attribute of the map to 100%, it doesn't show, and if I wrap the gmap with a div container with 100% height, it still doesn't work. how can I make a full screen responsive gmap?
You can show a full screen responsive p:gmap on following way:
Lets assume that p:gmap is defined like this (no need for style attribute)
<p:gmap id="gmap" center="41.381542, 2.122893" zoom="13" type="hybrid" />
Place following JavaScript on your page that will do the trick
<script>
function resizeElement(elementId,width,height){
console.log("Resizing element " + elementId + " W/H="+ width + "/" + height);
var element = document.getElementById(elementId);
element.style.width=width+"px";
element.style.height=height+"px"
}
function resizePfGmapFullScreen() {
var width = window.innerWidth - 20;
var height = window.innerHeight - 20;
resizeElement("gmap", width, height);
}
window.onload = function() {
window.dispatchEvent(new Event('resize'));
};
window.onresize = function(event) {
console.log("Screen is resized");
resizePfGmapFullScreen();
};
</script>
Advantage of this solution is that p:map will be automatically resized when screen is resized including screen orientation change on mobile devices.
It is tested running on the latest Primefaces version 6.1.

How to create vertical "pages" where each page is height of the viewport using Bootstrap and Angular?

I am using Angular 1.3 and Bootstrap 3.2. I want to create a single webpage that does exactly this: http://lewisking.net. i.e. I want to be able to have vertically stacked divs that are the height of the viewport. I'm thinking of making a directive that watches the browser height/width and updates the style accordingly.
Any other ideas? Any tips for implementing with a directive?
This is the perfect use case for vh and vw.
Simply set:
.wrapper {
width: 100vw;
height: 100vh;
}
And it will work out the box. If you have to support any old browsers you can easily do a quick JS fall back.
CSS will get you part of the way, but you will need JS to update your 100% height on resize
and scrollTop points etc. And you will also need a way to animate the scroll anyway. This isn't exactly what I would do but it explains the basic idea.
$($window).on('resize', function() {
$scope.winWidth = $(window).width();
$scope.winHeight = $(window).height();
});
...
$scope.getSectionStyle = function(){
return {width:$scope.winWidth, height:$scope.winHeight} ;
}
...
<section id="sectionId" ng-style="getSectionStyle()"
To animate the scroll I just use jQuery like. If you're a angular purist there is $achorScoll but it has no animating at this point so you need to do some extra factory or directive like https://github.com/durated/angular-scroll/
$rootScope.scrollTo = function(_to){
$("html, body").delay(300).animate({scrollTop:_to},{ easing: "easeOutExpo"}, 2000);
}
To get _to you just find the elements offset().top something like :
var offset = $('#sectionId').offset();
$rootScope.scrollTo(offset.top);

Infinity.js - Issues with rendering inline-block elements & a grandpa container with defined height

I've been trying to integrate infinity inside a defined scrolled area.
My UI is a bunch of inline-block thumbnails (not floated). Grid Layout.
Infinity works perfect inside my page when it occupy the whole page width & height, and each element is block level, with simple DOM inside.
But when create a little more advanced UI, with grid interface, and an infinity area to scroll inside a container (ListView's height isn't defined. It's container does), then all gets wrong.
Even more than that. If I give 100% to HTML & Body, infinity fails. it calculates wrong listView`s height.
How to solve this? Grid UI is a desired & common one.
JS Fiddle Demos:
All 1300 elements are block-level - #OK
ListItem (CSS) Width & Height defined - #OK
ListItem as inline-block - #Broken
Code Example (Infinity NG Integration)
var demoApp = angular.module("demo", []);
demoApp.controller("demoCtrl", function($scope) {
$scope.items = [];
for(var i = 0; i < 1300; i++) {
$scope.items.push({ title: "Item " + i });
}
});
demoApp.directive("infinityScroll", function() {
'use strict';
return {
restrict: "A",
transclude: true,
link: function(scope, elm, $attrs) {
scope.listView = new infinity.ListView($(elm));
}
};
});
demoApp.directive("infinityItem", function() {
'use strict';
return {
restrict: "A",
link: function(scope, element, attrs) {
scope.listView.append(element);
}
}
});
PostScript: I noticed in the API Reference, that ListItem has width & Height properties. Same as ListView.
I couldn't find how to implement it, Inside the build code itself, i haven't seen how to pass this properties to the object.
Sorry if its obvious thing, and its possible to do that.
Will appreciate any help.
Thanks.
Actually right now I discovered my problem.
2 elements that messed up with my UI where actually - Overflow:Hidden for my Body,HTML, and Height:100% for a page container.
I have removed Overflow:Hidden, and Height from the page container (not ListView!) and all is fine.
'useElementScroll:true' and .scrollable classname did not assisted me, and prevented me from needing do this actions.
Now my UI is impacted, and I need to see how I`ll solve it.
Edit:
I have opened an issue at airbnb git, and I hope they will pay attention to this. Not been able to set a father and relate only to him, is an issue that adds complexity.
https://github.com/airbnb/infinity/issues/46

Large background images using css

How can I load images to cover the whole background like some websites, using CSS. Not the usual background-image property but I want to load the images quickly.
Examples:
http://www.marinayachting.it/
http://alexandraowen.co.nz/
background-image is the only way to place images in CSS. If you want it to be vary large put it on the body element or a container div that fills the entire viewport.
body {
margin: 0;
padding: 0;
width: 100%;
background-image: url('my_big_image.jpg') norepeat;
}
If you use a container div you can set position:fixed; top:0; left:0 and the image will remain stationary when the page scrolls.
There's no magic to it. As far as getting it to load quickly I don't think there's much you can do if it doesn't repeat. If it does repeat then make sure your image is the size of one module. This can be as little as one pixel tall or wide depending on the content.
There is no magic to making a background image load quickly, you just:
Have a fast server.
Compress the image as much as possible.
Make your page HTML small so that the rest can start loading as soon as possible.
Don't have many other images that also has to load.
Don't have a lot of scripts and other external files that has to load.
I found this tutorial helpful. ->
http://css-tricks.com/perfect-full-page-background-image/
Bing is loading a normal background image with a fixed size. It´s not particularly fast (for me...), but perhaps it seems fast because the image is cached after the first time you load it.
You can set the style inline so that the image can start downloading without waiting for any css file to be ready.
If you set an image let's say a picture as a background you need to make it large enough to accommodate large screen sizes. You don't want the experience on your site to be, that your picture repeats multiple times on the screen. Probably at the least width should be 1260px. If background is just a simple gradient, you can cut a small part of it in photoshop and apply it on the body like this:
body {
margin:0;
padding:0;
background:#fff url(your/image/location.jpg) repeat-x scroll 0 0;
}
This method could be applied to divs too, Good luck.
In your second example site, alexandraowen.co.nz, if you took a second to look at the JS they use, you would have seen the following:
// backgrounds --------------------------------------------------------------//
var Backgrounds = {};
Backgrounds.init = function()
{
$('body').each
(
function()
{
var imgsrc = $(this).css('background-image');
if(imgsrc != 'none')
{
imgsrc = imgsrc.slice( imgsrc.indexOf('(') + 1 , -1);
$(this).css('background-image', 'none');
$(this).prepend('');
if($.browser.msie)
{
// ie 7 is the slow kid and we have to strip out quote marks ffs!
$(this).find('div.bg img').attr('src', imgsrc.split('"').join(''));
}
else
{
$(this).find('div.bg img').attr('src', imgsrc);
}
}
}
);
Backgrounds.resizeHandler();
$(window).resize(Backgrounds.resizeHandler);
$('div.bg img').load(Backgrounds.resizeHandler);
}
Backgrounds.resizeHandler = function()
{
var w = $(window).width();
var h = $(window).height();
$('div.bg img').each
(
function()
{
var wr = w / $(this).width();
var hr = h / $(this).height();
var r = Math.max(wr, hr);
var imgw = Math.round($(this).width() * r);
var imgh = Math.round($(this).height() * r);
$(this).width( imgw );
$(this).height( imgh );
var l = Math.round((w/2) - (imgw/2));
$(this).css('margin-left', l+'px');
}
);
}
As well as the HTML on the page:
<body style="background-image: none; ">
If you dig into their scripts a bit more, you can see what they did. But I guarantee you it's nothing faster than just setting the background-image property.
<img id="foo" src="bar" alt=""> with #foo { width: 100%; height: 100%; }(use position: absolute; / position: relative; & z-index for layering as desired)
Here's an old example.

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