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XtremeOS Obsessive-Compulsive (I) Inmate From: BAtavia, Il, USA Insane since: Feb 2004	posted 02-24-2004 04:55 i just got into java and html and im readin through a java book and this is a exercise, i just cant get it working it looks good but wont load the other pictures, can anyone help? here is the link http://home.earthlink.net/~mr_vercetti/Precaching%20Images.htm its set up on my ftp <HTML> <HEAD> <TITLE>Image Object</TITLE> <script language="JavaScript"> <!-- function SymError() { return true; } window.onerror = SymError; //--> </script> <SCRIPT LANGUAGE="JavaScript"> // pre-cache four images image1 = new image(120,90) image1.src = "http://home.earthlink.net/~mr_vercetti/chick.bmp" image2 = new image(120,90) image2.src = "http://home.earthlink.net/~mr_vercetti/jenna.jpg" image3 = new image(120,90) image3.src = "http://home.earthlink.net/~mr_vercetti/Mechina/Mechina-Banner.gif" image4 = new image(120,90) image4.src = "http://home.earthlink.net/~mr_vercetti/Mechina/a.jpg" // load an image chosen from select list function loadCached(list) { var img = list.options[list.selectedIndex].value document.thumbnail.src = eval(imag + ".src") } </SCRIPT> </HEAD> <BODY> <H2>Image Object</H2> <IMG SRC="chick.bmp" NAME="thumbnail" HEIGHT=90 WIDTH=120> <FORM> <SELECT NAME="cached" onChange=loadCached(this)"> <OPTION VALUE="image1">Funny <OPTION VALUE="image2">Funny as Hell!! <OPTION VALUE="image3">haha <OPTION VALUE="image4">yea right </SELECT> </FORM> </BODY> </HTML> haha
MedHead Nervous Wreck (II) Inmate From: Insane since: Feb 2004	posted 02-24-2004 06:32 Well, I'm not great at debugging javascript, but it appears to me that you're missing the declaration of what the images are. You have the images there, but they're not defined as anything, so that when your javascript calls for LoadCached(this), there isn't any Cached list. That or because the name for your drop down combo box is "cached" and your javscript calles for "Cached". As I said, not that great at debugging javascript, especially when I'm not warmed up. First post too, by the way.
Wes Paranoid (IV) Mad Scientist From: Inside THE BOX Insane since: May 2000	posted 02-24-2004 14:40 Incidentally, Java does not equal JavaScript. May help you avoid some confusion in the future.
DL-44 Maniac (V) Inmate From: under the bed Insane since: Feb 2000	posted 02-24-2004 19:10 Yep, Java != Javascript, and this != an HTML question
Slime Lunatic (VI) Mad Scientist From: Massachusetts, USA Insane since: Mar 2000	posted 02-24-2004 19:17 You have a JavaScript error: line 27, unterminated string constant. Looks like you forgot the opening quotation mark in onChange=loadCached(this)".

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XtremeOS
Obsessive-Compulsive (I) Inmate

From: BAtavia, Il, USA
Insane since: Feb 2004

posted 02-24-2004 04:55

i just got into java and html and im readin through a java book and this is a exercise, i just cant get it working it looks good but wont load the other pictures, can anyone help?

here is the link http://home.earthlink.net/~mr_vercetti/Precaching%20Images.htm
its set up on my ftp

<HTML>
<HEAD>
<TITLE>Image Object</TITLE>

<script language="JavaScript">

</script>

<SCRIPT LANGUAGE="JavaScript">
// pre-cache four images
image1 = new image(120,90)
image1.src = "http://home.earthlink.net/~mr_vercetti/chick.bmp"
image2 = new image(120,90)
image2.src = "http://home.earthlink.net/~mr_vercetti/jenna.jpg"
image3 = new image(120,90)
image3.src = "http://home.earthlink.net/~mr_vercetti/Mechina/Mechina-Banner.gif"
image4 = new image(120,90)
image4.src = "http://home.earthlink.net/~mr_vercetti/Mechina/a.jpg"

// load an image chosen from select list
function loadCached(list) {
var img = list.options[list.selectedIndex].value
document.thumbnail.src = eval(imag + ".src")
}
</SCRIPT>
</HEAD>

<BODY>
<H2>Image Object</H2>
<IMG SRC="chick.bmp" NAME="thumbnail" HEIGHT=90 WIDTH=120>
<FORM>
<SELECT NAME="cached" onChange=loadCached(this)">
<OPTION VALUE="image1">Funny
<OPTION VALUE="image2">Funny as Hell!!
<OPTION VALUE="image3">haha
<OPTION VALUE="image4">yea right
</SELECT>
</FORM>
</BODY>
</HTML>

haha

MedHead
Nervous Wreck (II) Inmate

From:
Insane since: Feb 2004

posted 02-24-2004 06:32

Well, I'm not great at debugging javascript, but it appears to me that you're missing the declaration of what the images are. You have the images there, but they're not defined as anything, so that when your javascript calls for LoadCached(this), there isn't any Cached list. That or because the name for your drop down combo box is "cached" and your javscript calles for "Cached". As I said, not that great at debugging javascript, especially when I'm not warmed up.

First post too, by the way.

Wes
Paranoid (IV) Mad Scientist

From: Inside THE BOX
Insane since: May 2000

posted 02-24-2004 14:40

Incidentally, Java does not equal JavaScript. May help you avoid some confusion in the future.

DL-44
Maniac (V) Inmate

From: under the bed
Insane since: Feb 2000

posted 02-24-2004 19:10

Yep, Java != Javascript, and this != an HTML question

Slime
Lunatic (VI) Mad Scientist

From: Massachusetts, USA
Insane since: Mar 2000

posted 02-24-2004 19:17

You have a JavaScript error: line 27, unterminated string constant. Looks like you forgot the opening quotation mark in onChange=loadCached(this)".

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