How do i load the original image so that when the user brings the cursor onto top of the image, it should change automatically without showing white background then loading the original pic? Is there any code that loads the original image wheh my webpage loads? Please let me know. my code is :
#middlefoto{
background-image:url(../images/middleblack.jpg);
margin-left:1px;
height:158px;
width:333px;
}
#middlefoto:hover{
background:#fff url(../images/middlecolor.jpg) 0 0 no-repeat;
}
Use sprites with positioning.
Find more information at W3 Schools
The reason you are seeing the blank background for an instant is because the hover image has not yet been loaded from the server. To avoid this, preload the images. There are several ways to do this but the concept is the same: force the browser to load the image before it is actually needed. Here's a simple way to do this using JavaScript:
function preloadImages(sources)
{
var img = new Image();
for (var i = 0; i < sources.length; i++) {
img.src = sources[i];
}
}
preloadImages([ '../images/middlecolor.jpg', 'image2.jpg', 'image3.jpg' ]);
Include the image in an off-screen element (push it off screen with CSS). This will cause the browser to download the image so it should be ready for the rollover. You could clean up the offscreen images after page load.
<img src="rollover image" class="preloader" style="position:absolute; margin-left:-99999px" />
(don't really use inline styles)
Then, if you're using jquery
$(document).ready(function(){ $('.preloader').remove(); });
to clean up.
Related
I am using Masonry (and imagesLoaded) with Wordpress:
<script src="http://cdnjs.cloudflare.com/ajax/libs/masonry/3.3.2/masonry.pkgd.min.js"></script>
and my site includes a number of images that ranges between 1 to 8 MB. I have noticed that the loading times are very long (I am using no pagination on Wordpress, so the page loads all content) and the grid keeps resizing until all images are loaded.
Is there a way to fix this?
This is my custom js:
$(document).ready(function() {
let $masonryGrid = $('.masonry-grid');
$masonryGrid.imagesLoaded(() => {
$masonryGrid.masonry({
columnWidth: '.grid-sizer',
itemSelector: '.grid-item',
gutter: 0,
percentPosition: true,
transitionDuration: 0
});
});
});
You can create a preview version for all of your images - same dimensions, but drastically downscaled quality. Maybe with a "Loading" text or symbol over them.
Those previews should have the same filename with a suffix. You will have pairs of images like this
image001.jpg
image001_thumb.jpg
Then the individual image elements will then automatically start loading the full version :
<img src="image001_thumb.jpg" onload="this.src=this.src.replace('_thumb','');" />
And if you cannot directly influence image elements like this, add this to your custom .ready function (this is an example that would affect all images, just to give you an idea, you have to filter out only the images that are inside the grid)
var images = document.getElementsByTagName('img');
for(var i=0;i<images.length;i++){
// If the image is already loaded, change it immediately
if(images[i].naturalWidth != 0) images[i].src = images[i].src.replace('_thumb','');
else // If not, give it an onLoad function to change after it does
images[i].onload = function(){
this.src = this.src.replace('_thumb','');
}
}
For a better experience, maybe you can try to reveal each item after its image has loaded.
See the extra exemples section on Masonry docs
Iteratively reveal items after each image is loaded. See explanation on issue #501
OK, so my problem is that I have a parallax website for a client and they would like a product description to fade-in when they scroll-down the parallax site. The problem I think I have is because the site is effectively one long page, the scripting is getting confused and fading the div in from "opacity:0" when the page is loaded. I have put a long fade-in on the div to understand what is happening and I have also made a rubbish box without proper formatting to test it. I have uploaded a temporary copy of the site (i'm working offline) to show what is happening.
http://ethicalincubator.com/parallax/parallax30.07/index_kmd.php#!images
Thank you for your help everyone!!! :-)
CSS
/* Hide any element */
.hideme {
Opacity:0;
}
HTML
<div
class="hideme fadein-on-view"
style="opacity:0;width:200px;height:80px;background-color:white;">Fade
In</div>
SCRIPT
<script>
// Scroller script for Fade-In when "div" is on screen
$(document).ready(function()
{
/* Every time the window is scrolled ... */
$(window).scroll( function(){
/* Check the location of each desired element */
$('.fadein-on-view').each( function(i){
var
bottom_of_object = $(this).position().top + $(this).outerHeight();
var
bottom_of_window = $(window).scrollTop() + $(window).height();
/* If the object is completely visible in the window, fade it it */
if(
bottom_of_window > bottom_of_object ){
$(this).animate({'opacity':'1'},5000);
}
});
});
})
</script>
To check the bottom of the window, instead of using .scrollTop, try window.pageYOffset.
Plus I think you're making the JS work too hard - I would try to calculate the bottom_of_object outside the .scroll() function so that it's not calculating the position every time the user is scrolling.
And for simple fade in/out, I would just do a display:none, .fadeIn().
I have few pages that I show from my main page inside iframe.
I got a background image in the main page, when I click the button to change the page inside the frame the frame background color is becoming white somtimes until the page is visible.
I added background-color:transpert to the pages themselves and to the main page CSS.
I checked the site with FireFox and IE and it look fine (the background of the frame doesn't change) but with Chrome it somtimes rendering fine like I wanted it to be and other times the iframe background goes White.
Can i do anything that will fix that?
As this is browser behavior I doubt it can be really "fixed".
One workaround is to hide the frame while it's loading (only for Chrome) - here is the code:
var isChrome = (navigator.userAgent.indexOf("Chrome") >= 0);
function LoadFrame(url) {
var oFrame = document.getElementById("myframe");
if (isChrome) {
oFrame.style.visibility = "hidden";
oFrame.onload = function() {
oFrame.style.visibility = "visible";
};
}
oFrame.src = url;
}
Live test case. (Reloading same frame there but the concept is the same)
I used very similar attitude. This approach works only in case the page inside your iFrame is under your controll.
The change is that the page inside iframe finds the iframe in parent window and makes it visible again:
<iframe style="visibility: hidden;" id="iframe_id" src="my_page.html" />
// inside my_page.html:
window.onload = function() {
// make sure the parent iframe is visible
if (window.parent)
{
var nodeIframe = window.parent.document.getElementById(window.name);
if (nodeIframe)
{
nodeIframe.style.visibility = "visible";
}
}
};
ok there are several similar questions but not quite anything that I want.
I have few ajax requests on page and I want to show the image in the center of the screen, and its all working OK.
Just to make it look more prominent, I wanted to place that image on a div with translucent background, so its more obvious for the end users. Now comes the tricky part.
I made the div with css like this:
.divLoadingBackground
{
filter: Alpha(Opacity=40); -moz-opacity:0.4; opacity: 0.4;
width: 100%;
height: 100%;
background-color: #333;
position: fixed;
top: 0px;
left: 0px;
}
This fills the page up alright, or, I should say, this fills the viewport. If I scroll the page down, the page is again normal. I want this div to span the ENTIRE LENGTH of the page, no matter how long the page is.
Here is an example mockup of the problem I made to quickly demonstrate:
As you can see, I took the example of SO for the mockup ;) image 1 shows that its okay when it appears. image 2 shows that it goes up with the page on scroll.
I'm a c# developer and css is as alien to me as ancient latin.
How to make this divLoadingBackground div to fill out the entire length of the page?
Many thanks for any help.
If you need any additional info, please comment!
One thing I dont see in your css is z-index. Fixed, although, fixes this problem, sometimes, based on how other divs are positioned, your divLoadingBackground div could end up in one of the divs.
try adding
z-index: 9999;
or something similar and see if it works.
Would have put this in a comment, but it seems I have too low rep to comment.
Where is the .divLoadingBackground div located in the DOM tree? Since it has fixed position, it shouldn't scroll with the page. This makes me belive that the element is too deeply nested. Try putting it right in the body level of the page and see if that helps.
Also, are you sure that some other css directive isn't changing the position attribute to absolute or something?
Also, make sure to use the right DOCTYPE. That has some impact on fixed position elements.
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN"
"http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd">
Oh, and ofcourse, fixed position isn't supported in IE6 and below.
I believe you will need JavaScript/jQuery to dynamically set the height of the div in question to the height of the page once rendered.
And if you're entering the world of web, it's time to learn that new language "CSS" as well as perpahs-not-quite-as-daunting JavaScript.
When I needed such a functionality some years ago, I examined how Google Calendar did it.
Basically, they use a timer-driven JavaScript file that checks for the height of the window and adjust the height of a contained DIV tag accordingly (or of an IFRAME tag, just any container tag that you like).
Here is a code snippet from a page I worked on:
<script type="text/javascript">
document.getElementsByTagName("body")[0].style.height = "100%";
document.getElementsByTagName("html")[0].style.height = "100%";
document.getElementsByTagName("body")[0].style.minHeight = "100%";
document.getElementsByTagName("html")[0].style.minHeight = "100%";
function height()
{
try
{
height_iframe();
}
catch(err)
{
}
}
window.onload=height;
// --
var ie6WorkaroundIFrameResize = 1;
function height_iframe()
{
var any = false;
var offset = 300;
var c = document.getElementById("iframecontent");
if ( c!=null )
{
c.style.height = (GetClientHeight()-offset)+"px";
any = true;
var d = document.getElementById("iframeie6");
if ( d!=null )
{
d.style.height = (GetClientHeight()-(offset+ie6WorkaroundIFrameResize))+"px";
any = true;
ie6WorkaroundIFrameResize = 0;
}
}
if ( any )
{
setTimeout( 'height_iframe()', 300 );
}
}
function GetClientHeight()
{
return document.documentElement.clientHeight;
}
</script>
Basically, the script regularly checks for the height of the window via the GetClientHeight() function and adjusts the element in concern ("iframecontent") accordingly.
I subtract some offsets of fixed-height headers and footers.
AFAIK you would need to set the size of this divthrough javascript. I would recommend using jQuery, in this way :
//$(document).height() gives the size of the document
//(as opposed to $(window).height() that would give the size of the viewport
$("div#overlay").css('height',$(document).height());
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.