Does this make sense?

Adrian MacNair

Because it's not working...

I want a condition where if only the images are all preloaded then the slide
show will work:

<script type="text/javascript">
var imagesdone=false;
window.onload=loadimages;
function loadimages() {
var images=new Array();
for (var i=0;i<myImages.length;i++) {
images[i]=new Image();
images[i].src=myImages[i];
}
imagesdone=true;
}
// This is an onClick event
function startslideshow() {
if (imagesdone) {
do slideshow stuff
} else {
alert('Sorry, images are not loaded for viewing yet')
}
}
</script>

Jul 23 '05 #1

Subscribe Post Reply

980

Randy Webb

Adrian MacNair wrote:

Because it's not working...

I want a condition where if only the images are all preloaded then the slide
show will work:

<script type="text/javascript">
var imagesdone=false;
window.onload=loadimages;
function loadimages() {
var images=new Array();
for (var i=0;i<myImages.length;i++) {
images[i]=new Image();
images[i].src=myImages[i];
}
imagesdone=true;
That doesn't ensure the images are loaded, it only ensures that the
request was made for the image. The imagesdone is set to true before the
first image is even downloaded.
Have the images preloaded while the page loads, then the window.onload
won't fire until they are loaded. Another possibility is to add an
onload to each preloaded image that will call a function that
incremements a counter, then checks the counter. If the counter matches
myImages.length then they are all loaded and it will set imagesdone to true.
}
// This is an onClick event
function startslideshow() {
if (imagesdone) {
do slideshow stuff
} else {
alert('Sorry, images are not loaded for viewing yet')
}
}
</script>

--
Randy
comp.lang.javascript FAQ - http://jibbering.com/faq & newsgroup weekly

Jul 23 '05 #2

alu

Another possibility is to write the images into the page but not display
them; the <body> onload would fire only when all images are loaded.
-alu
<script type="text/javascript">

var imagesdone=false;

// This is an onClick event
function startslideshow() {
if (imagesdone) {
alert("do slide show") ;
} else {
alert('Sorry, images are not loaded for viewing yet')
}
}
</script>
</head>
<body onload="imagesdone=true;">

<a href="#" onclick="startslideshow()">test images loaded?</a>

<script>
for (var im=0;im<myImages.length;im++) {
document.write('<img src="'+myImages[im]+'" alt=""
style="display:none">')
}

</script>

</body>

Jul 23 '05 #3

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