Preloading Function Doesn't Actually Preload
Feb 10, 2010
im trying to extend a gallery jQuery plugin and have been succesfull as of now. I extented the gallery as to when i click next it doesnt only show the next image on the gallery, but also changes the src attr on 2 different images with id's "preview1" and "preview2". I am no expert in javascript but im studying software engineering, so im VERY familiar with JAVA(ye i know its different, but thats indicating im no programming nub).
What i want to do is create code that loads the 2 preview images, and then WHEN FULLY LOADED fade them in with the jQuery function.(.fadeIn('slow)What happens now is that images start fading in whilst they havent been fully loaded yet, so you still see the old images ~ half way through the fade. a way i can wait for the image i'm loading for "var preloadimg" to complete, and then continue? I'm puzzled and wasted too many time on this already. What i do not want to do is simply preload all images when loading the site, i only want to preload them when i want to fade them in.
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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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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 1, 2010
I'm using the Google AJAX APIs, but some reason google.load works when run through normal javascript, but if I call the method from my jquery ready function it doesn't work. Code and output is below
page.html
<script type="text/javascript">
loadGoogleStuff();
function loaded() {
console.debug("in loaded function");
}
[Code]...
window.loadFirebugConsole is not a function If I comment out line 3 in code.js, the console debug runs okay, so the ready function is running okay. Even though there's a reference to Firebug, the same error occurs in Safari too. Nothing on the page loads.
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Apr 21, 2011
Very simple code, and it won't work...
Code:
<script type="text/javascript">
function Toggler() {
Alert();
[code]....
For some reason, this doesn't work on my page. onClick="Alert();" DOES work, but "Toggler();" doesn't. I know, right?! Further weirdness, the code DOES work if I create a simple HTML page that contains nothing but the code contained above. But when I put it into my existing page, it stops working whenever it's embedded. Alert works, Toggler doesn't.
My page is an index.php file which pulls a pre-established "head.tpl" and "foot.tpl", and slots in the requested content between them. I'm trying to put this code in "head.tpl". This is the only JavaScript I'm using (so far), and other than that it's all HTML, CSS and PHP.
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Apr 14, 2011
I'm finding IE9 handles the preloading of images using the Image object differently to its earlier versions.For example:
This code in the <head>
Code:
<script type="text/javascript">
var picData = ['num1.jpg','num2.jpg','num2.jpg','num2.jpg'];
picO = new Array();
[code]....
Earlier versions of IE seem to work as FF4 does.It appears that the window.onload event in IE9 does not take into account if all the images have completed downloading via the above FOR loop whereas FF4 and the others do.
The workaround I am using is to preload the images in hidden <img>'s at the top of the <body> and then loading them into an Image object to get the jpg's actual width and height. This is working in IE9, FF4 and the other majors.
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Aug 18, 2004
You know how most Web pages load elements one-at-a-time? Well, I'd like to have my page appear all-at-once (all graphics, text, etc.).
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Apr 30, 2001
I'm using ie 5 and I was preloading these images for a rollover and I noticed the preloading wasn't working.
I looked at my code from all angles and couldn't figure it out - checked online examples on how to do it - same way I'm doing it.
Checked a different browser - worked fine.
So is there a security setting in IE that may disable preloading stuff? Or idoes my browser just need to be reinstalled?
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Jun 5, 2001
Is it possible to preload .js files the same way as pics (or any other way) ? The reason i ask is I have grabbed some nifty navigation code, but takes a little time to load first time.
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Oct 19, 2005
I´m using the following code to preload the hover images of my navigation:
Code:
menu_0101 = new Image();
menu_0101.src = "images/menu_0101_h.gif";
My question: When I enter the page the second time will the images be taken from the browser´s cache or from the server?
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Apr 14, 2011
I'm finding IE9 handles the preloading of images differently to IE8 and FF4 and the latest versions of other browsers.
In IE9 the preloading still works ok unless I want to use the width or height properties of the created Image object before the src of the new Image has been assigned to an <img>
For example:
This code in the <head>
Code:
outputs '0 0' in IE9 and '150 250' in FF4 and the latest versions of the major browsers. 150 and 250 are the actual width and height of mypic1.jpg
Earlier versions of IE seem to work as FF4 does.
It appears that the window.onload event in IE9 does not take into account if all the images have completed downloading via the above FOR loop whereas FF4 and the others do.
The workaround I am using is to preload the images in hidden <img>'s at the top of the <body> and then loading them into an Image object to get the jpg's actual width and height. This is working in IE9, FF4 and the other majors.
Have I missed or misunderstood something in the the way IE9 works?
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Aug 9, 2011
I am attempting to preload an array of images on my website so that they preload in order and only preload one at a time (the images are large and I want them to load in the order they will be viewed in.)So far I have this:
Code:
var images = new Array();
images[0]="website/users/user1/images/0001_000_808460.jpg"
images[1]="website/users/user1/images/0001_001_800872.jpg"
[code]....
This preloads the images all at once. I have yet to figure out a way so that "images[0]" loads first and completely before "images[1]" (and so on).
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Nov 23, 2010
What am doing wrong? The script works -- identifies blank fields -- but the second function (change_subject) is ignored.[code]
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Jan 18, 2010
I have a very simple webpage which plays music from youtube, only top 2000 records from the Netherlands URL...For that i've made a database with music links from youtube, and it works fine. But i want more quality.Therfore I've made a Push button and link with a function within it.if sombody want to say to me if its bad quality music that my database is updated by push the button or link. (part -->php script)[code]
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Jul 23, 2005
Is this the correct way to preload an image...?
Var Image1 = new Image()
....And then when I'm ready to use the image I can do this...?
Button1.src=Image1.src
....Or am I just telling Button1 to use the same source path as Image1?
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Sep 14, 2005
I now have, in the header,
[Code]...
The above is in the first page where only the first image above, the before-and-after.gif image, is displayed. The rest are displayed in the second page linked to the first and are shown by using an array
[Code]...
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Oct 9, 2010
Is it possible to preload a single div with jquery? or simple Javascript?
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Aug 31, 2009
I have a function that changes the src of an image:
JavaScript Code:
function ChangeSRC(url_src)
{
document.getElementById("photo").src = url_src;
}
[code]....
Neither of these methods seem to work; especially in IE. Is there a better way to preload dynamic images?
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May 16, 2009
I'm working on an embedded system that I want to stream images from a webcam and having a world of problems.I originally started out using mime's multipart/x-mixed-replace to send the images to the browser and it worked well but IE has no support for it and it simply didnt work on slow connections.So i've changed to creating an image object and preloading it with JS but I cant get any onload functionality to work :crying: I want the page to preload a picture, display it, repeat with the next picture etc.
This is a rough version of what I have so far and it works while the timer is quite high >1sec, but just below that random images don't get displayed. With small delays, say 0.1sec the images are loaded but never displayed. why can't i get it to SHOW the image, THEN load the next one
PHP Code:
<script>
var image = new Image();
var tmr = -1;
[code]...
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Mar 14, 2009
I just spent 3 hours analyzing tons of lightboxes, image galleries, jQuery plugins. Now I'm a bit frustrated.I don't want a snazzy animation effect.I don't want a pre-made layout.This is what I want:On page load, 12-15 bigger images are preloaded into browser cache.Div#container contains a default image.When user clicks a thumbnail link, the corresponding (bigger) preloaded image shows inside #container.
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May 11, 2009
I'm trying to combine two scripts I found online to make a preloader for all the images in a folder. The javascript part works when you manually enter in a list of images, so I was trying to make a php array to get all the names of the images in one directory, then use that to list them. Here's what I tried:
<?php
function dirList ($directory)
{
[code]...
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Jun 13, 2003
I just thought this might be useful - short little pre-loading of images on webpage.
Code:
<body onload="preImages()">
<script>
function preImages(){
if (document.images){
aImgSrc = new Array("image1","image2","image3");
aImgLst = new Array ();
for(counter in aImgSrc){
aImgLst[counter] = new Image();
aImgLst[counter].src = "images/" + aImgSrc[counter] + ".jpg";
}}}
</script>
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Jul 6, 2011
I am developing a website for my budding photographer son, Tom, and I want to provide an gallery where the user clicks on a thumbnail and this displays a larger image. The only way I see that I can do this is to have a link on the thumbnail to load the page again passing the image name or id to the page using a query string and processing this using PHP. If I preload all of the larger images when the site first loads will these images be available in the cache for other pages.Another way is to hover the thumbnails and display the larger image but I need to find a way to keep the image displayed until the user hovers over another thumbnail.
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Mar 16, 2005
I issue a css rule for my table that will contain the masthead thus:
table.banner{background-image:url(background.gif);background-repeat:no-repeat;}
Afterwhich i preloaded the background image using javascript thus:
<script>
banner=new Array();
banner[1]=new Image();
banner[1].src="background.gif";
</script>
when i tested this script i didn't notice that the background image got pre loaded pls am i doing anything wrong?
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Dec 11, 2005
The two pages for preloading below seemed to preload images IF I used an absolute path but they don't preload the images if I just used relative paths like the ones below.
Give it a try. The two pages below using relative paths won't work. Then try changing the paths of the images in both pages to use absolute path(with http://) which will work.
But I want to use relative paths. What can be done? Other than inserting 1x1 size of the images I want to preload. Code:
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May 1, 2010
I have a page where there are 4 images that are loaded as a div background via css file.
When I try to use javascript to preload them it just does not look like its pre loading them.
I tried doing the following but the images don't pre loaded. They appear one after another.
Code:
<SCRIPT language="JavaScript">
<!--
pic1= new Image(100,25);
pic1.src="http://someplace.com/image1.gif";
//-->
</SCRIPT>
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