I am currently doing a photography site.I would like to do a 'portfolio' page, but would like to pre-load the images so that they appear on-screen faster.Do I need to connect code to <body onload>?
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Anyone loading a bunch of CSS or Javascript via <link> tags on a web page knows about "blocking": where the browser stops the loading of the page because it has to go fetch (and read/parse) an external file. If you have a lot of these, or even if you don't and the user has a slow connection, you have a slow page. Users hateses teh slow pages, hatses them.
At the 2010 Fronteers Conference, Stoyan Stefanov gave a talk on Progressive Downloads and Rendering, where he listed some tricks to get around blocking by Javascript or other external files to make page load speed up. One trick was adding a <script> tag in the body (near the bottom, so after the important stuff has loaded) which adds a <script> tag to the <head> dynamically and runs it. While that file is being fetched, the rest of the page can continue to load. This is a bit asynchronous, isn't it (similar to web pages still loading content while also fetching images)?
As a follow-up to his Higher Order Javascript article (see SitePoint thread about it), Piers Cawley has gone further with Asynchronous Streams, where he uses jQuery (as an example) to load external files asynchronously to avoid blocking of the HTML document loading. In my web development career I haven't worried about blocking, but plenty of folks around here are loading ginormous files, and lots of them, for large sites. As developers, what do you do to get around slow page loads? Have you done anything like this asynchronous calling of the external files?
I'm having difficulty loading images via Ajax on a site that I've been working on.I'm performing the ajax by using the Request.HTML object of the MooTools framework. Basically, I'm just passing some parameters to a php script which outputs some image tags and then I insert that HTML into a pre-defined content div. For some reason though, it seems that big images don't seem to load consistently when using this technique. Usually, they will just show up as broken images, but when I navigate to the url of the image that is 'broken', it displays just fine. Also, occasionally after navigating to the actual url of the image, my browser will cache the image and then it will display just fine when loading it through Ajax.
View 3 Replies View RelatedI am an asp.net developer and I wanted to display user popup (kind of) which freezes the screen so that user won't click anything else on the screen. There are some predefined controls in asp.net, but I wanted do this using Javascript.
View 1 Replies View RelatedI have a basic page which has a PHP form. It creates a record and uploads a picture. When they user clicks submit, I need it to display a "loading" notice of some description. I was using this:
[Code]....
and then placed a div in the page but it shows the message right at the top of the screen. As the form is long, the user cannot see the message. I need to create some sort of notice so users know the form is being processed.
I've run into a roadblock I just can't seem to get past. I'm developing a website for work (internal) and I have a lot of javascript calculations going on when someone enters data. What I want to do is to have a div apear when it begins calculating and goes away when it ends. I'm using:
// CSS code
div.loading-invisible{ display: none; }
div.loading-visible { display: block; ... various formatting here ... }
// Javascript
function calculate(evalForm) {
document.getElementById("loading").className = "loading-visible";
[Code]...
It works great in firefox. The div display appropriately, calculates, then disappears when it's finished. However, in IE it seems to want to calculate everything before anything is displayed. I placed alerts in the code to be able to pause it mid way and it worked. But without alerts it just hangs while everything is being calculated and the code for the loading screen just seems to cancel itself out. I attempted to put some waits in the code such as:
[Code]...
It's for a photo gallery like this http:[url].....php but the one I need it for has 100 images so the page loads much slower. I can't just put the loading gif behind the images (as you would normaly) because you can see it with each image fade in and out. how I can have a loading gif show "only" while the images are initially loading, and then it goes away?
View 1 Replies View RelatedThis might be a combo Javascript / CSS question I'm building a website, and I'm wanting to have small, approx 100px x 100px pop up display that has a "page loading" spinning gif. I also want the page to fade out while this image is displayed. For instance, someone submits a form that takes 3-4 seconds to load. Once they hit submit, the screen darkens, the new window comes into focus, center of screen, and it has some kind of rotating gif, basically a trigger 'on submit'..
View 3 Replies View Relatedthere I am using the below code to resize images posted on a forum, however when the page is loading it loads the images full size on sreen stretching the page to however wide the largest picture is and only resizes them once every picture has loaded and the page then goes back to normal width.oes anyone know how I could make it so the images only display once they've resized ?
<script>
window.onload = resizeimg;
function resizeimg()
[code]....
I have a web application with an aspanel, users can add images, the program automatically make the thumbnail. when user click on thumbnail they can see a pop up modal page.
Images are in different sizes, so what I need to achieve is to get the screen resolution or browser visible area and re-size the image according to this resolution. (users could have different type of computer screen with different resolution), I need a Javascript or jquery code.
I have a web application with an aspanel, users can add images, the program automatically make the thumbnail. when user click on thumbnail they can see a pop up modal page.Images are in different sizes,so what I need to achieve is to get the screen resolution or browser visible area and re-size the image according to this resolution.(users could have different type of computer screen with different resolution), I need a JavaScript or jquery code.
View 1 Replies View RelatedI need to display a set of images. NOT a slideshow that automatically changes, but a very simple display, one image at a time, that moves to next or previous by mouse click or arrow.
I can retrieve the set of filespecs in php with no problem. And I've got the setup in php to display the file, one at a time.
I"ve figured out how to open a full-screen window in javascript.
What I need (I started in php and they sent me over here for specific javascript info), is to put everything together...
1. I'd LIKE to automatically set the resolution on the system to 1024x768. I've been told html and javascript can't do that, so it'll have to be done by the user.
2. I figured out how to open a full-screen window in javascript.
3. What I need is to display the image from php and have it show up in the full-screen window I created. Then it just sits there until the user presses an arrow key (or hopefully something with the mouse) to go to the next (or previous) image. Back to php for the next file and display...
Once the last image in the set is displayed I'd like to have the window I created go away, sending me back to the screen from which all that got started...
So, as far as I know, the two things I need to know are how to display an image in a particular window from php. And, how to get mouse-clicks and/or arrow keys back to php so I can use them....
I am try to make images float across the screen horizontally. Ideally I would like them to come from both sides and be at different y positions.
The problem I am having is that I can only seem to get one to move at a time.
Another problem is that when they move off to the right of the screen it expands the viewable size of the site.
So here's what I've come up with thus far.
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html><head>
<title>Image Mover</title>
<style>
[Code]....
If the paths to images are hard-coded into an a global array, does that mean
that they are pre-loaded? If not, what is the algorithm to do so?
I am trying to load an image into a div using AJAX.Instead on loading the image, I get PNG as the result in the div.Does anyone know how to load an image into a div?
View 5 Replies View RelatedI have following type of code in the header
function pre_load_pics()
{
if (document.images)
{
var image1 = new Image(400,265);
image1.scr = "pic1.jpg";
var image2 = new Image(400,265);
image2.scr = "pic2.jpg";
etc etc
}
and the following in the body
<script>
pre_load_pics();
</script>
but images are not downloaded until the app needs them later. Something wrong ? I thought they should be downloaded earlier?
I feel like a complete fool! I should know the answer to the Q:
How do I load an image with JS and replace the default image?
Some background: My final objective is to have a web site where it
is VERY difficult to copy images off the site. The first thing I
was going to do was force folks to turn on JavaScript so that I
could disable the right click pop up menu. To force this, I thought
I would have all the default images say that JavaScript is required
to view the images. The problem is that I cannot figure out for the
world in me how to load the good image.......
I am currently using the scrollable jquery plugin to scroll some images of thumbnails in a gallery. What I'm trying to do now, is figure out how to load the large version of those thumbnails into a div when they are clicked.
Here is a link to the webpage where the source can be viewed. [URL]
I want to pre-load images for my gallery, but I'm not sure of the best way to go about it. Currently, I have php code that generates thumbnail images on page load and while this works fine, it at times can be very time consuming. For reference, below is my php code. how I could/should pre-load images?
<div id="galleryReel">
<ul>
<?php[code]......
I have some rollover images on my website, and they don't switch until the page is finished loading.Is this standard? Is there a way to have the rollovers work when the page is still in the process of loading all the images?
View 2 Replies View RelatedIn my website I constructed a script that changes the image.sources of several images. The changes are made by calling a JS-function. The function is invoked by selecting an option in an html-form. In my second post below I pasted the code.
The problem is that each time the images are changed the browser starts to load them all again, although all images were PRELOADED in the <head> section of my HTML page. It takes time every time a user invokes image changings, and also the visual effects are worsened.
How can I prevent the browser from loading the images again each time?
I am using Lightbox v2.04 with ASP.Net 2008. The issue i am finding is that the images that are controlled by the java script are not loading if the page is in a sub folder. I have my main folder that contains a folder for my java script folder, a folder for my images, and a folder that contains some pages.
This is the code in the lightbox.js file that i believe may be the cause.
LightboxOptions = Object.extend({
fileLoadingImage: '../images/loading.gif',
fileBottomNavCloseImage: '../images/closelabel.gif',
Is there something specific that needs to be done so that the pages in the sub folder can have this work?
I'm looking for a Javascript function that will display a loading icon in place of some large images I have on my website.
On a slow connection the large images take a while to load and I need something in place of those images until they have loaded fully.
I would like to display a different set of images each time a person visits a web site. I have seen this done in many banner advertisments and product photos. Can someone tell me how this can be done with Javascript?
View 2 Replies View RelatedI have php script that reads an image from database and outputs it.If i send request via AJAX i get the "inside" of the image into responseText, how to output it to a browser.so i can see an image instead an text?
View 1 Replies View RelatedI am currently working on a new tool that changes the websites header based on the option from the navigation list the user clicked on, so far so good.But now I want to make this easy to maintain so that the class name of the list retrieves an image from the folder with the exact same name, so eventually I would only have to insert the option and the image is automatically loaded.
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