Image Preload With A For Loop
Dec 8, 2005
This isn't working and I can't figure out what I'm doing wrong:
var c_imgs = new Array(
'images/champascari.jpg',
'images/champfangio.jpg',
'images/champhawthorn.jpg',
'images/champhill.jpg',
'images/champsurtees.jpg',
'images/champlauda.jpg',
'images/champschumacher.jpg');
var pre_img;
for (var i = 0; i < c_imgs.length; i++)
{
pre_img[i] = new Image();
pre_img[i].src = c_imgs[i];
}
If this code is correct, should I put it in a function and then call for
it ?
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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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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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Aug 28, 2009
I have this working fine, and I can append the preloaded image to a hidden div then fade the div in for a smooth effect.
Problem is I want to set this preloaded image as a css background image, not as a <img /> in a container. But if when the image is loaded, instead of .prepend() I do .css() and set the css property of a background-image to be the preloaded images URL, then when it carries on with displaying it the browser loads the image again. Rather than using the preloaded one.
I want the image to be a background image as I want it centered in the page background, even if it is too large for the viewport.
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Jan 8, 2005
I got a script that rotates my images, but I have almost 300 in stock and it is preloading all 300 once the script is started. How do I get it to preload one at a time, or nothing at all? Code:
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Aug 23, 2005
My question is can I use home page preload some images which will not be used for this page, but will be (potentially) used for later pages?
My problem is the home page does not have any images at all, I use following code in head section:
<script language="javascript>
img0 = new Image();
img1 = new Image();
img2 = new Image();
img3 = new Image();
img4 = new Image();
img5 = new Image();
img0.src = "./images/arrowUp.gif";
img1.src = "./images/arrowUp.gif";
img2.src = "./images/track.gif";
img3.src = "./images/drag.gif";
img4.src = "./images/arrowDown.gif";
img5.src = "./images/bottom.gif";
</script>
This cause the home page display nothing.
Any ideas or thought?
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Jul 8, 2009
I trying to:
- preload an image
- then call it as a a background image.
But cant get it to work- here is my code...
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Aug 10, 2011
I want to use an image as a CSS background-image so I used the Image constructor to load the image: [URL] but I noticed that the browser (Firefox) load the image from the URL and not from the memory when changing the background-image property (it takes about 1.5 seconds before showing the image, and every time I reload the page!)
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Aug 2, 2005
Will this code suffise to preload two given images into the browsers' cache, before the page has loaded?
// preload images
tipTransparentImage = new Image();
tipTransparentImage.src = 'images/bg.png'
tipTransparentBgImage = new Image();
tipTransparentBgImage.src = 'images/bgs.png'
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Jul 30, 2010
I recently switched my image pre-loading to more "efficient" code I came across.
However, it doesn't seem to be working as the images only load on mouse over.code...
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Jun 11, 2003
Any way to have a "status bar" popup while images are loading???
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Feb 7, 2011
Basically what I'm trying to achieve is when a new image is selected(clicked), the 'click' passes the new image name (and width, height) to the 'changeimg' function, I want this function to fade the current img so we can see the back ground wait img. then when the new image has preloaded successully, replace the current image and fade it back to full. It appears to do this mostly, but its not preloading the image, sometimes the contain will exapand to the new size and I'll see the image loading into it.
I'm wondering if I'm using the preload (new Image()) correctly, I cant locate any examples similar to what I'm doing. Most exapmles I see all appear to be to do with image rollovers. Which isn't what I need, I also do not want to pre load any images until they have been requested.
[Code]...
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Oct 3, 2009
I'm trying to preload an image before it fades in and I'm using the following code to do so. Could someone please tell why it doesn't work? The layer fades in and then the image suddenly shows up.
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Feb 20, 2011
I have a large image that I change by clicking on some small images to change it.
I use this code to preload images and then fade in, but it doesn't look nice. Once the images are cached into the computer the fading is perfect, but the first time it seems like it fades at the same time as it loads. I wonder if it could be done in some other way? Perhaps use a callback or preload all images into an array, but I'm new and don't really knows how to put i together yet?
$("#bild1").click(function(){
$("#main_image").attr("src","bild1.jpg").hide().fadeIn(1000); });
I use the code above for each thumnail images.
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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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Jan 22, 2006
I've got 2 questions if that's OK. I have a number of scripts running on a site i'm working on and I think I may be getting a clash with the image preload and another font resizing script. As I am new to javascript I have picked up the code from elsewehere. I am trying to get my head around it reading tutorials etc but am getting stuck when it comes to multiple scripts on the page
There are a number of scripts running: browser detect, png opacity, image preload, layer show/hide and a font resize.
here is the site
Q1 In IE5.5+ on the PC neither the font sizer nor the image preload is working - i think it is a clash of onload events. Can anyone suggest a fix?
Q2 I think there must be a better way to have my images preload. The current code is the dreamweaver version. Is there a better way?
function MM_swapImgRestore() { //v3.0
var i,x,a=document.MM_sr; for(i=0;a&&i<a.length&&(x=a[i])&&x.oSrc;i++) x.src=x.oSrc;
}
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];}}
}
function MM_findObj(n, d) { //v4.01
var p,i,x; if(!d) d=document; if((p=n.indexOf("?"))>0&&parent.frames.length) {
d=parent.frames[n.substring(p+1)].document; n=n.substring(0,p);}
if(!(x=d[n])&&d.all) x=d.all[n]; for (i=0;!x&&i<d.forms.length;i++) x=d.forms[i][n];
for(i=0;!x&&d.layers&&i<d.layers.length;i++) x=MM_findObj(n,d.layers[i].document);
if(!x && d.getElementById) x=d.getElementById(n); return x;
}
function MM_swapImage() { //v3.0
var i,j=0,x,a=MM_swapImage.arguments; document.MM_sr=new Array; for(i=0;i<(a.length-2);i+=3)
if ((x=MM_findObj(a[i]))!=null){document.MM_sr[j++]=x; if(!x.oSrc) x.oSrc=x.src; x.src=a[i+2];}
}
onload = function()
{
MM_preloadImages(
'../images/icons/iconO_01.gif',
'../images/icons/iconO_02.gif',
'../images/icons/iconO_03.gif',
'../images/icons/iconO_04.gif',
'../images/menu/menuDown_01.gif',
'../images/menu/menuDown_02.gif',
'../images/menu/menuDown_03.gif',
'../images/menu/menuDown_04.gif',
'../images/menu/menuDown_05.gif',
'../images/menu/menuDown_06.gif',
'../images/menudrop/coD_01.gif',
'../images/menudrop/coD_02.gif',
'../images/menudrop/coD_03.gif',
'../images/menudrop/coD_04.gif',
'../images/menudrop/coD_05.gif',
'../images/menudrop/prD_01.gif',
'../images/menudrop/prD_02.gif',
'../images/menudrop/prD_03.gif',
'../images/menudrop/seD_01.gif',
'../images/menudrop/seD_02.gif',
'../images/menudrop/seD_03.gif',
'../images/menudrop/seD_04.gif',
'../images/menudrop/seD_05.gif',
'../images/menudrop/seD_06.gif',
'../images/menudrop/soD_01.gif',
'../images/menudrop/soD_02.gif',
'../images/menudrop/soD_03.gif',
'../images/menudrop/soD_04.gif',
'../images/menudrop/paD_01.gif',
'../images/menudrop/paD_02.gif',
'../images/menudrop/paD_03.gif',
'../images/menudrop/neD_01.gif',
'../images/menudrop/neD_02.gif',
'../images/menudrop/neD_03.gif',
'../images/disc/discCD_01.gif',
'../images/disc/discCD_02.gif',
'../images/disc/discCD_03.gif'
);
}
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Nov 24, 2006
Does anyone have a code snippet that would preload and entire directory (and sub-directories)?
I'm using a basic JS array to load individual images but was hoping I could find a more scaleable/efficient way of doing it?
var yourImages = new Array("images/1.jpg", "images/2.jpg")
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Sep 23, 2010
I'm trying to find a JQuery plugin that will:
a) preload all img's and background's on a given page
b) display an animated gif in the center of the original's img's or background's container
c) fade out showing each image once it's downloaded
d) as a consequence of (a) allow the page to render (show) quicker even if (depending on server speed, connection speed and user computer speed) the remaining images are still in a 'load state'.
e) is based on JQuery so not to increase page's footprint via adding Mootools, Prototype, YUI or the like (unless the additional 100KB or so is so worth it).
I've scouted Google and there a few out there but amazingly none seem to focus on doing this for a web page's image's but rather seem to focus on galleries/lightbox windows and so forth.
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Nov 21, 2011
I am trying to use a for loop to call images of custom text. For example, I have images named uppera.png and lowera.png for a custom font. I need the image of the letter to show up as they type into a text area, but also have backspace work correctly to delete the last image added. Here is the code I have thus far:
<script type="text/javascript">
function callimage() {
var chars = document.getElementById('userinput').value.split("");[code]....
When I test this out it takes the previously entered text and adds it to the new text and combines them. For instance if you entered "a" it would show up as "a"; if you entered "a" again it would show up as "aaa" and then "aaaaaa" and so on. Also, it will add the existing characters again if any key is pressed, like just shift. I think I would need to write an else statement to fix that part, but I don't know what to put there, either.
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Jan 26, 2007
I want to build a loop, which cycles through a set of images and displays each image for a few seconds. In Firefox everything works fine, IE6 also executes the code but gives an script error in the status bar ("not implemented"). The relevant line of code is in red in the code below.
What could cause this ugly error in IE?
Code:
var imgpath = "imgtest/";
var errpic = 1;
var maxpic = 5;
function imgloop(actno) {
if(actno==maxpic) {
actno=1;
} else {
++actno;
}
preload(actno);
}
function imgshow(actno) {
document.mainpic.src = imgpath + actno + ".jpg";
imgloop(actno);
}
function delay(actno) {
setTimeout("imgshow(" + actno + ")", 5000);
}
function preload(actno) {
img = new Image();
img.onload = delay(actno);
img.src = imgpath + actno + ".jpg";
}
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Jun 21, 2011
I'm trying to change the src attribute of an image within a loop and I only get the last image in the sequence. I've put a break-point and I can see that listItems contains the right source for all my 3 images, but I only see the last after the initial change from the original source. pausecomp is a delay function.Here's the code for that loop (this is part of a bigger program within SharePoint)
[Code]...
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Dec 14, 2010
I'm having a little bit of trouble with an image slider I am doing. I need it to loop to the beginning of the slide show when it reaches the end of the images
Here is my markup:
Code:
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "[URL]">
<html xmlns="[URL]">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8" />
<title>Twin Tiers Technologies - Image Slider</title>
<link href="styles.css" rel="stylesheet" type="text/css" />
<script src="jquery-1.4.4.min.js" type="text/javascript"></script>
<script src="scripts.js" type="text/javascript"></script> .....
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May 15, 2011
I'm having problems with my script I wanted to change my script into a loop, but I can't seem to make it work
Here is the sample: [url]
I wanted to make it loop from image 1 to image 7 when the mouse pointer is on the image. So basically your mouse pointer goes in and out.
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Apr 13, 2011
Here is my code:
Code:
if (!goBook)
{
if (V == "*")[code]....
What I am trying to do is display a different image for each car type in the loop (eg carpic1, carpic2, carpic3 etc).
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Jan 11, 2011
I found a simple image rotating script online and it works like a charm. I have several business logo images on my site and the script randomly selects and displays the images. However, since it selects the images at random you don't get an even mix of logos. Sometimes one or another logos will show up more frequently than others. To avoid this I added a simple DO-WHILE loop with an array. Now it will go through my whole list of logos once in random order, which is just what I want to happen. The trouble is, once it goes through the list of logos once, it freezes up.
I want it to reset after it goes through the whole list. Then it can keep running indefinitely. I tried adding a simple increment counter (counter++; ) and an IF-THEN line in the getNextImage() function so when the counter reached the number of images it would restart via the restart function, but now the images won't show up at all. I tried adding the counter++ at different locations but the result is the same: it doesn't work, so I took it out. Here is the site it will go on, complete with two rotating images (I doubled up on the rotate code) which rotate completely randomly. The one in the center doesn't change: [URL].
Here's a working, stripped down version of the code which shows the images at random: [URL]. And here's the same code with the DO-WHILE loop and the myArray added, which rotates once then locks up:
Code:
<html>
<head>
<title>test</title>
<link rel="stylesheet" href="file:///D|/Downloads/dw_rotate/css/ex.css" type="text/css" />
<script type="text/javascript">
var interval = 2;
var random_display = 1;
interval *= 1000;
function restartImage() {
var counter = 0;
rotateImage('rImage');
} .....
Any way on adding something to count the number of times the images are displayed, and resetting the count once the total number of images has been reached.
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