Preload Many Images
Jul 23, 2005
I have tried several preload scripts found here; plus, some of my own.
The only thing that works is the unsophisticated loading of those
tiny images. The download consist of 100+ images amounting to 50+mb;
and, normally completes in less than 1 minute without preload (using
DSL).
The preload terminates after 6 or 7 images and seems to time-out in the middle of an image. A reload will download a few more, etc. I have used the <body onLoad=function()>
approach as well as the non-function approach of JS that executes immediately with the page's loading. Getting the same results with Netscape-7 and IE-6.
I need to add: The source of the array containing the image references is a '.js' file. That doesn't seem pertinent as some of the images always load.
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Jun 1, 2004
I would like to preload all images on a certain page, without 'knowing' which pictures are on the page. (I want to write a .js file, put in the header of all the pages)... So, I don't know what pictures are on the particular pages.
Can this be done? If so, how?
Than another question (if the above is possible)... Say, one of the 'found' pictures can't be loaded (it's not in the correct folder)... can this pictures be replaced with another picture? (for instance: pic_not_found.jpg).
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Dec 5, 2010
the first 4 tabs are showing some images as background:clicking the tabs will trigger a fading-effect, but as long as the user hasn't watched the 4 images, the effect is "interupted" by the loadingprocess of the images. is it possible to preload those images so that they are in the browsercache or something?
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Jul 23, 2005
I'm preloading images with the standard code:
default1 = new Image(); default1.src = "images/image1.gif";
changed1 = new Image(); changed1.src = "images/image1-on.gif";
default2 = new Image(); default2.src = "images/image2.gif";
changed2 = new Image(); changed2.src = "images/image2-on.gif";
And this is my rollover code:
var iName="";
function Ichange(p) {
var pSrc=eval(p+ ".src");
document[iName].src = pSrc;
}
But for some reason on the first mouseover it doesn't seem like the
image has been preloaded. There is a delay, like it's looking for the
rollover image, which should have already been preloaded. Anyone have
any ideas why?
Here is the inline code for a mouseover:
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Nov 25, 2006
I think to preload an image I should us something like:
img = new Image();
img.src = 'images/img.jpg'
Could someone tell me how to create a loop which would preload a list
of images? Something like:
ImagesFolder = '...'
ImagesNames = '...'
For i = 0 to ImagesNames.Count
img = new Image();
img.src = imagesFolder + imagesNames(i)
End
Is this a good approach? Could someone tell me the javascript code for this?
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Feb 3, 2009
i am making a gallery and i was advised by philip m to preload my images before hand, so that the gallery runs smooth. i have done so but in a different way to what ive seen on some of the other posts on this forum and i was just wondering if this was practical javascript or am i over doing it.bascially, the images are external hrefs loaded into place holders.the external hrefs are stored as strings in an array.
so the loop runs for however many image hrefs are in the array.so the first iteration of the loop, an image is created and is given the href of whateever value the loop is of the array.then for each iteration of the loop, the var img, is overwritten with the next href in the array.so technically, iam not creating as many images as there are in the array, i am just creating 1 then overwriting it, but still loading the image data in to the browser cache.
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Mar 28, 2011
I have some images 5 or 6 that are 800 x 300 i use in my website banner.The start loading but when number one is 1/3 of the way teh next one starts then the next, it looks real messy nee some way to preload them ... like black square or something .code i used below
<script language="JavaScript">
// configuration structure
var A_TPL = {[code].....
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May 27, 2009
I want to create a preload for images but do not want to have to specify every single image file name.Is there a way to just specify a folder and all images in ti will be preloaded?
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Nov 18, 2009
i want all of the images to preload, but i want to do it in such a way that i don't have to list all of the images a second time.. I want it to somehow grab all the images from the array and load them. is there a simple or relatively easy way of doing that?
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Jun 24, 2003
I have a site that I have a bunch of rollovers for..
I have a preload image script as follows:
<SCRIPT LANGUAGE="JavaScript">
<!-- Begin
image1 = new Image();
image1.src = "/images/image1-over.jpg";
image2 = new Image();
image2.src = "/images/image2-over.jpg";
// End -->
</script>
This works just fine for NETSCAPE... it preloads it, so you can cruise over the rollovers perfectly without wait the first time you load.
However, with IE, it doesn't work the way it should, and it still takes time to load each rollover when you hover the first time. And they don't seem to cache properly and you're constantly reloading them.
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Mar 29, 2005
can I use JS to preload images used later on the nav? So when a user uses it, it doesn't have to download the image, just take it from the cache?
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May 14, 2007
I have a site that uses image navigation with a CSS rollover. The images flicker for about a second while the rollover images load. I'd like to preload the images with JS. Now, they're about 10 images in one directory, is there a way to just preload all the contents of the directory?
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Mar 4, 2002
I had opportunity to meet with Creole a few days ago and we were discussing some options to pursue in the Build forum. I thought I'd start here in javascript and find out methods users use to preload images. I realize that this information can likely be found in a google search, but if we can get some good insight, maybe start putting an FAQ of javascript issues for Sitepoint Forums together. What do you think?
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Oct 29, 2002
I am using the below preload images script and It seems to not be working... PHP Code:
<script>
function doPreload()
{
var the_images = new Array('/images/pd2.gif','/images/explore2.gif',
'/images/games2.gif','/images/shops2.gif','/images/chat2.gif',
'/images/mail2.gif','/images/help2.gif','/images/login2.gif',
'/images/logout2.gif');
preloadImages(the_images);
}
function preloadImages(the_images_array) {
for(var loop = 0; loop < the_images_array.length; loop++)
{
var an_image = new Image();
an_image.src = the_images_array[loop];
}
}
</script>
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Jul 20, 2005
I have a rolling image script that works fine except that the images do not seem to be preloading properly. The images are still being pulled on every interval from the
server according to the logs...is it because I am using the document.write method? Is that forcing a refresh? Code:
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Jul 18, 2009
i am using the javascript Image object to preload images, on FF everything works fine but ie always reload the images so i get some flicking.
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Dec 29, 2010
i am working on a facebook like photo viewer. I have used javascript to declare an array of about 200 images. I have the following approach to pre-load the images.I preload all the images when the page loads:
HTML: <body onload = "lodpic()">
JAVASCRIPT:
function lodpic()
{
for(i=0; i<=199; i++) {[code]....
The problem is the page tries to load all the images when opened. And when the user clicks "next" to view other photos, the other photo is still loading where as some are already loaded.I would like the code to be able to load the photo that the user is currently viewing as the user gets to that picture, before the page tries to finish loading all the photos.In other words, if the user wants to view a particular photo directly, that photo should get the priority of loading quickly.
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Nov 13, 2006
I have built a function that allows users to select a color tile and trim option for a cooking range. Here is a code snippet showing the function:
var color, trim, description;
function displayRange(selectColor, selectTrim, showDes)
{
var rangeName;
if (selectColor != '')
color = selectColor;
if (selectTrim != '')
trim = selectTrim;
rangeName = "images/cluny1400" + color;
if (trim == 'chrome')
rangeName += "_chrome";
rangeName += ".jpg";
var rangeDescription;
if (showDes != '')
description = showDes;
rangeDescription = description;
document.getElementById('rangePict').src = rangeName;
document.getElementById('rangeDes').innerHTML = rangeDescription;
}
Based on the users selections the range image in the selected color and trim is loaded into the interface. My problem is this:
The selected image is made up of three elements, based on the users selection, color and trim and the .jpg extension. This function works well.
However, I cannot work out how to use the image object to preload the images (of which there will be over 34). Normally you would assing a var to hold a new instance of the image object and then assign the src property to the image url. But how do I do that when the var rangeName is composed of three elements. I cannot use a simple var and then call that var in the function.
I have this code snippet, that illustrates my problem:
// create function to preload images
// eliminate older browsers by checking for image object support
function preload() {
if (document.images) {
cluny1400au = new Image(478, 314);
cluny1400au.src = "images/cluny1400au_fw.jpg";
cluny1400au_fw_chrome = new Image(478, 314);
cluny1400au_fw_chrome.src = "images/cluny1400au_fw_chrome.jpg";
}
}
The vars cluny1400au and cluny1400au_fw_chrome would be fine if I could use them in the function to call the images, but I don't think this will work as I believe that you have to use the same var name in the function as in the image object.
Can anyone tell me how the cluny1400au = new Image(478, 314); and cluny1400au_fw_chrome.src = "images/cluny1400au_fw_chrome.jpg"; should be constructed to work with the function.
Here is an html snippet from the page to aid clarity:
<body onLoad="preload()">
<div id="wrapper">
<p><img src="images/cluny1400_bw_chrome.jpg" name="rangePict" width="478" height="314" id="rangePict" /></p>
<p id="rangeDes" name="rangeDes">Description</p>
Thank you in advance for any help.
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Aug 4, 2003
This code seems so simple but I can not get it to work. I am trying to preload images for use in an image swap. This is the code I am using:
<body onLoad="preloadimages('ro_bui.jpg', 'ro_mar.jpg', 'ro_sto.jpg', 'ro_mec.jpg', 'ro_pai.jpg', 'ro_fib.jpg')">
<script language="JavaScript" type="text/javascript">
<!--
function preloadimages() {
var roimages=new Array();
var arguments=preloadimages.arguments;
for (i=0;i<arguments.length;i++){
roimages[i]=new Image();
roimages[i].src=preloadimages.arguments[i];
}
}
-->
</script>
In the mouseover event I have
<a href="marina.htm" onmouseover="document.images['ro'].src=roimage[0].src" onmouseout="document.images['ro'].src='ro_base.jpg'">
for each rollover....
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Jul 28, 2005
I want to create a javascript function which preloads a few images.
The function preloadImages should receive a variable which indicates the web site current culture.
If culture = "pt-PT" then should use arrayptPT
If culture = "en-GB" then should use arrayenGB
and so on...
Then all images of the array should be loaded using a For loop.
All the images in the array are in path: images/ culture value /.
So the ideal would be to have only the image filenames in the arrays.
Then the loop would go throught the right culture array and load all the images there from folder images/ culture value /...
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Nov 11, 2005
Ever had the problem that when creating mouseover buttons using CSS and Javascript, it takes a little while to load the second image? This script will automatically loop through all loaded stylesheets and will preload them into your browser, so no need to create an image-list by hand.. Code:
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Mar 31, 2009
Am using jquery and javascript to load images.Everthing is working fine, but I would like the user to be taken to a webpage for each of the images below.
Code:
function PreloadImg(){
$.ImagePreload("/images/slash2.jpg");
[code]....
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Oct 26, 2002
Who can tell me about some function which just preload some little poor images 4 me?
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Jul 23, 2005
I'm using HTML 4 Strict and looking for a way to preload a sound.....
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Jul 20, 2005
I´m using dreamweaver´s built in preloader for a menu. it looks like this:
function MM_preloadImages() { //v3.0
var d=document; if(d.images){ if(!d.MM_p) d.MM_p=new Array();
var i,j=d.MM_p.length,a=MM_preloadImages.arguments; for(i=0; i<a.length;
i++)
if (a[i].indexOf("#")!=0){ d.MM_p[j]=new Image; d.MM_p[j++].src=a[i];}}
Then, in the body tag you have the preload:
<body onload="MM_preloadimages('/images/image1.jpg','/images/image2.jpg')">
But I don´t want the function calls to be in the file itself, BUT linked to
an extenal js file.....
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Jul 20, 2005
Has anyone else had this issue? Basically, the preload of images for a
rollover effect for the navigation is really really slow when using IE
6.0 but when i view the site using Netscape, it's fast like it should
be(no lag!)
My problem is that since 96% of users use IE, i need to figure a way
to fix this. Below is the javascript currently being used. The
arguments are passed in before the script is called.
MM_preloadImages(
'<%=assets_path%>/left_nav/manage_view_wthr_on.gif',
'<%=assets_path%>/left_nav/manage_admin_guide_on.gif',
'<%=assets_path%>/left_nav/manage_terms_cond_on.gif',
'<%=assets_path%>/left_nav/manage_reports_on.gif',
'<%=assets_path%>/left_nav/manage_account_info_on.gif',
)
function gn_rollover_preload(){
//preloads middle images for the navigation
if (document.images){
var argLength = gn_rollover_preload.arguments.length;
for (arg=0; arg < argLength; arg++){
eval(arguments[arg] + "_off = new Image()");
eval(arguments[arg] + "_on = new Image()");
eval(arguments[arg] + "_left = new Image()");
eval(arguments[arg] + "_right = new Image()");
eval(arguments[arg] + "_off.src = '" + ASSET_PATH_HEADER +
"button_nav_"+ arguments[arg] + "_off.gif'");
eval(arguments[arg] + "_on.src = '" + ASSET_PATH_HEADER +
"button_nav_"+ arguments[arg] + "_on.gif'");
eval(arguments[arg] + "_left.src = '" + ASSET_PATH_HEADER +
"button_nav_"+ arguments[arg] + "_left.gif'");
eval(arguments[arg] + "_right.src = '" + ASSET_PATH_HEADER +
"button_nav_"+ arguments[arg] + "_right.gif'");
}
// Now Preload all "corner" images for faster swapping
corner1 = new Image();
corner2 = new Image();
corner2_both = new Image();
corner3 = new Image();
corner3_both = new Image();
corner4 = new Image();
corner4_both = new Image();
corner5 = new Image();
corner1.src = eval("'" + ASSET_PATH_HEADER +
"button_nav_corner_1.gif'");
corner2.src = eval("'" + ASSET_PATH_HEADER +
"button_nav_corner_2.gif'");
corner2_both.src = eval("'" + ASSET_PATH_HEADER +
"button_nav_corner2_both.gif'");
corner3.src = eval("'" + ASSET_PATH_HEADER +
"button_nav_corner_1.gif'");
corner3_both.src = eval("'" + ASSET_PATH_HEADER +
"button_nav_corner3_both.gif'");
corner4.src = eval("'" + ASSET_PATH_HEADER +
"button_nav_corner_1.gif'");
corner4_both.src = eval("'" + ASSET_PATH_HEADER +
"button_nav_corner4_both.gif'");
corner5.src = eval("'" + ASSET_PATH_HEADER +
"button_nav_corner_2.gif'");
}
}
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