slideshow and variable name for images (global?)

D

drillbit_99

I have an HTML page of thumbnail images. Each image can begin a
slideshow of the images on the page by clicking on the image. This
opens another HTML page that begins the slideshow using large images of
the thumbnails. When the slideshow begins it always starts with the
first image. I would like to pass the name of the thumbnail to the
slideshow HTML page and begin the slideshow with the same image the
user clicks on. Is this asking too much? Does anyone have a solution?


-----------------------------------------------------------------
---------thumbnail page
-----------------------------------------------------------------
-----------------------------------------------------------------
-----------------------------------------------------------------


<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"
"http://www.w3.org/TR/1999/REC-html401-19991224/loose.dtd">
<html>
<head>
<title>DHS Homecoming 2005</title>
<meta http-equiv="content-type" content="text/html;
charset=iso-8859-1">
<link rel=stylesheet type="text/css" href="styles.css">
</head>

<body>
<h1 class=title>Homecoming 2005</h1>

<p class=desc>Munson Stadium, Forest Park - September 23,
2005<br><br>Click on any photo to see an enlarged version.
</p>

<br>

<center>
<table cellspacing="12">
<tr>
<td class=thumbnail width="192" height="192">
<a href="pictures/slides.html" name="dsc_0021"><img
src="thumbs/DSC00067.jpg" width="192" height="131" border="0"
alt="DSC00067.jpg"></a>
</td>
<td class=thumbnail width="192" height="192">
<a href="pictures/slides.html" name="dsc_0018"><img
src="thumbs/DSC00068.jpg" width="192" height="131" border="0"
alt="DSC00068.jpg"></a>
</td>
<td class=thumbnail width="192" height="192">
<a href="pictures/slides.html" name="dsc_0020"><img
src="thumbs/DSC00069.jpg" width="192" height="131" border="0"
alt="DSC00069.jpg"></a>
</td>
</tr>
<tr>
<td class=thumbnail width="192" height="192">
<a href="pictures/slides.html" name="dsc_0022"><img
src="thumbs/DSC00070.jpg" width="192" height="131" border="0"
alt="DSC00070.jpg"></a>
</td>
<td class=thumbnail width="192" height="192">
<a href="pictures/slides.html" name="dsc_0029"><img
src="thumbs/DSC00071.jpg" width="192" height="131" border="0"
alt="DSC00071.jpg"></a>
</td>
<td class=thumbnail width="192" height="192">
<a href="pictures/slides.html" name="dsc_0030"><img
src="thumbs/DSC00072.jpg" width="192" height="131" border="0"
alt="DSC00072.jpg"></a>
</td>
</tr>
<tr>
<td class=thumbnail width="192" height="192">
<a href="pictures/slides.html" name="dsc_0031"><img
src="thumbs/DSC00073.jpg" width="192" height="131" border="0"
alt="DSC00073.jpg"></a>
</td>
<td class=thumbnail width="192" height="192">
<a href="pictures/slides.html" name="dsc_0033"><img
src="thumbs/DSC00074.jpg" width="192" height="131" border="0"
alt="DSC00074.jpg"></a>
</td>
<td class=thumbnail width="192" height="192">
<a href="pictures/slides.html" name="dsc_0035"><img
src="thumbs/DSC00075.jpg" width="192" height="131" border="0"
alt="DSC00075.jpg"></a>
</td>
</tr>
<tr>
<td class=thumbnail width="192" height="192">
<a href="pictures/slides.html" name="dsc_0038"><img
src="thumbs/DSC00076.jpg" width="192" height="131" border="0"
alt="DSC00076.jpg"></a>
</td>
<td class=thumbnail width="192" height="192">
<a href="pictures/slides.html" name="dsc_0039"><img
src="thumbs/DSC00077.jpg" width="192" height="131" border="0"
alt="DSC00077.jpg"></a>
</td>
<td class=thumbnail width="192" height="192">
<a href="pictures/slides.html" name="dsc_0040"><img
src="thumbs/DSC00078.jpg" width="192" height="131" border="0"
alt="DSC00078.jpg"></a>
</td>
</tr>
<tr>
<td class=thumbnail width="192" height="192">
<a href="pictures/slides.html" name="dsc_0041"><img
src="thumbs/DSC00079.jpg" width="192" height="131" border="0"
alt="DSC00079.jpg"></a>
</td>
<td class=thumbnail width="192" height="192">
<a href="pictures/slides.html" name="dsc_0046"><img
src="thumbs/DSC00080.jpg" width="192" height="131" border="0"
alt="DSC00080.jpg"></a>
</td>

</tr>
</table>
</center>



<br>
<br>
<table cellspacing="8">
<tr>
<td width="20" height="20"> </td>
</tr>
</table>


<p class=desc>Last updated: 6/10/2005
</p>

</body>
</html>


-----------------------------------------------------------------
----------slideshow page
-----------------------------------------------------------------
-----------------------------------------------------------------
-----------------------------------------------------------------



<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"
"http://www.w3.org/TR/1999/REC-html401-19991224/loose.dtd">
<html>
<head>
<title>SOSU Marching Contest</title> <script language="JavaScript">

<!-- Begin
NewImg = new Array (
"DSC00081.jpg",
"DSC00082.jpg",
"DSC00083.jpg",
"DSC00084.jpg",
"DSC00085.jpg",
"DSC00086.jpg",
"DSC00087.jpg",
"DSC00088.jpg",
"DSC00089.jpg",
"DSC00090.jpg",
"DSC00091.jpg",
"DSC00092.jpg"
);
var ImgNum = 0;
var ImgLength = NewImg.length - 1;


var delay = 3000;

var lock = false;
var run;
function chgImg(direction) {
if (document.images) {
ImgNum = ImgNum + direction;
if (ImgNum > ImgLength) {
ImgNum = 0;
}
if (ImgNum < 0) {
ImgNum = ImgLength;
}
document.slideshow.src = NewImg[ImgNum];
}
}
function auto() {
if (lock == true) {
lock = false;
window.clearInterval(run);
}
else if (lock == false) {
lock = true;
run = setInterval("chgImg(1)", delay);
}
}
</script>
<link rel="stylesheet" type="text/css" href="../styles.css">
</head>
<body>
<img src="DSC00081.jpg" name="slideshow" width="850">
<table border="10" frame="box" width="850" bgcolor="#FFCC33">
<tr>
<td align="center" width="100">
<a href="javascript:chgImg(-1)">Previous</a>
</td>
<td align="center">
<a href="javascript:auto()">Auto/Stop</a>
</td>
<td align="center" width="100">
<a href="javascript:chgImg(1)">Next</a>
</td>
</tr>
</table>
</body>
</html>
 
A

ASM

(e-mail address removed) a écrit :
I have an HTML page of thumbnail images. Each image can begin a
slideshow of the images on the page by clicking on the image. This
opens another HTML page that begins the slideshow using large images of
the thumbnails. When the slideshow begins it always starts with the
first image. I would like to pass the name of the thumbnail to the
slideshow HTML page and begin the slideshow with the same image the
user clicks on. Is this asking too much? Does anyone have a solution?
Click to expand...

I'll expect functions of slideshow work

----slideshow page----

[JS part]

funcion getImg() {
newImg = self.location.search.substring(1)
auto(newImg);
}

function auto(nbrImg) {
nbrImg = (nbrImg && nbrImg!='') nbrImg : 1;
if (lock == true) {
lock = false;
window.clearInterval(run);
}
else if (lock == false) {
lock = true;
run = setInterval("chgImg("+nbrImg+")", delay);
}
}

[HTML part]

<body onload="getImg()">

----end complement slideshow----

-----thumbnail page-----

links this way :

<a href="pictures/slides.html?67" name="dsc_0021"><img
src="thumbs/DSC00067.jpg" width="192" height="131" border="0"
alt="thumbnail" title="click me to get me in a slideshow"></a>

add number of image to load at end of href
don't forget the '?'
href="file.htm?number"
 
D

drillbit_99

I added the function "getImg" to the slideshow page and replaced the
function "auto" with your script. I also replaced the "body" tag.

I changed my link on the thumbnail page and made sure I kept the '?'.

When I tried the code, a click on the second picture link (using '?68')
it performed as if nothing had changed. The link still opens the first
picture in the slideshow.

Should the '?' variable be 'DSC00068.jpg'? I tried that also and
nothing changed.
 
A

ASM

(e-mail address removed) a écrit :
I added the function "getImg" to the slideshow page and replaced the
function "auto" with your script. I also replaced the "body" tag.

I changed my link on the thumbnail page and made sure I kept the '?'.

When I tried the code, a click on the second picture link (using '?68')
it performed as if nothing had changed. The link still opens the first
picture in the slideshow.

Should the '?' variable be 'DSC00068.jpg'? I tried that also and
nothing changed.
Click to expand...
an error in a function ?
(a '?' forgoten)

try this :

function auto(nbrImg) {
nbrImg = (nbrImg && nbrImg!='')? nbrImg : 1;
if (lock == true) {
lock = false;
window.clearInterval(run);
}
else if (lock == false) {
lock = true;
run = setInterval("chgImg("+nbrImg+")", delay);
}
}
 
A

ASM

(e-mail address removed) a écrit :
I added the function "getImg" to the slideshow page and replaced the
function "auto" with your script. I also replaced the "body" tag.

I changed my link on the thumbnail page and made sure I kept the '?'.

When I tried the code, a click on the second picture link (using '?68')
Click to expand...

68 have to be the index of array corresponding
to photo to start with

that's to say i.e. "DSC00085.jpg" in your example :
link -> href="pictures/slides.html?4"
it performed as if nothing had changed. The link still opens the first
picture in the slideshow.

Should the '?' variable be 'DSC00068.jpg'? I tried that also and
nothing changed.
Click to expand...

sorry, some misunderstanding with your original script
hope this time it will be ok

----slideshow page----

[JS part]

// new function to start on correct image
funcion getImg() {
ImgNum = self.location.search.substring(1);
// alert to verify if that's ok (to delete after tests)
alert('image number : '+ImgNum);
lock == false;
chgImg(1);
auto();
}

// re-insert old function auto()
// and of course all complete old script you did have
function auto() {
nbrImg = (nbrImg && nbrImg!='') nbrImg : 1;
if (lock == true) {
lock = false;
window.clearInterval(run);
}
else if (lock == false) {
lock = true;
run = setInterval("chgImg(1)", delay);
}
}

<body onload="getImg();">

----- end ----

if that runs only after some delay
you can try without the onload in body tag
and puting in all end of page (before </body>)
the following :

<script type="text/javascript">
getImg();
</script>


====== variante ======

if you prefer a link this way :
(real photo number)

<a href="pictures/slides.html?0038" name="dsc_0038"><img
src="thumbs/DSC00076.jpg" width="192" height="131" border="0"
alt="DSC00076.jpg">

// new function to start on correct image
funcion getImg() {
var startImg = self.location.search.substring(1);
// alert to verify if that's ok (to delete after tests)
alert('image number : '+startImg);
for var(i=0;i<ImgLength;i++)
if(NewImg.indexOf(startImg)>0) ImgNum=i;
// alert to verify if that's ok (to delete after tests)
alert('image Array index = '+ImgNum);
lock == false;
chgImg(1);
auto();
}
 
D

drillbit_99

Well, I'm pretty stupid with Javascript. I placed the new code in the
slideshow page, but I don't see where the function 'getImg' is called.
Can you tell me how to make the call? Below is the revised code for
the slideshow page. Thanks for the help.


<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"
"http://www.w3.org/TR/1999/REC-html401-19991224/loose.dtd">
<html>
<head>
<title>Homecoming</title> <script language="JavaScript">
<!-- Original: Mike Canonigo ([email protected]) -->
<!-- Web Site: http://www.munkeehead.com -->

<!-- This script and many more are available free online at -->
<!-- The JavaScript Source!! http://javascript.internet.com -->

<!-- Begin
NewImg = new Array (
"DSC00067.jpg",
"DSC00068.jpg",
"DSC00069.jpg",
"DSC00070.jpg",
"DSC00071.jpg",
"DSC00072.jpg",
"DSC00073.jpg",
"DSC00074.jpg",
"DSC00075.jpg",
"DSC00076.jpg",
"DSC00077.jpg",
"DSC00078.jpg",
"DSC00079.jpg",
"DSC00080.jpg"
);
var ImgNum = 0;
var ImgLength = NewImg.length - 1;

//Time delay between Slides in milliseconds
var delay = 3000;

var lock = false;
var run;
function chgImg(direction) {
if (document.images) {
ImgNum = ImgNum + direction;
if (ImgNum > ImgLength) {
ImgNum = 0;
}
if (ImgNum < 0) {
ImgNum = ImgLength;
}
document.slideshow.src = NewImg[ImgNum];
}
}



// new function to start on correct image
function getImg() {
ImgNum = self.location.search.substring(1);
// alert to verify if that's ok (to delete after tests)
alert('image number : '+ImgNum);
lock == false;
chgImg(1);
auto();

}

// re-insert old function auto()
// and of course all complete old script you did have
function auto() {
nbrImg = (nbrImg && nbrImg!='') nbrImg : 1;
if (lock == true) {
lock = false;
window.clearInterval(run);
}

else if (lock == false) {
lock = true;
run = setInterval("chgImg(1)", delay);
}

}
</script>
<link rel="stylesheet" type="text/css" href="../styles.css">
</head>
<body onload="getImg();">
<img src="DSC00067.jpg" name="slideshow" width="850">
<table border="10" frame="box" width="850" bgcolor="#FFCC33">
<tr>
<td align="center" width="100">
<a href="javascript:chgImg(-1)">Previous</a>
</td>
<td align="center">
<a href="javascript:auto()">Auto/Stop</a>
</td>
<td align="center" width="100">
<a href="javascript:chgImg(1)">Next</a>
</td>
</tr>
</table>
</body>
</html>
 
A

ASM

(e-mail address removed) a écrit :
Well, I'm pretty stupid with Javascript. I placed the new code in the
slideshow page, but I don't see where the function 'getImg' is called.
Can you tell me how to make the call? Below is the revised code for
the slideshow page. Thanks for the help.
Click to expand...

ok,
with, in other page, links with real photo number
(I don't know if photo number would be 0038 or 0076 ?)

<a href="pictures/slides.html?0038" name="dsc_0038"><img
src="thumbs/DSC00076.jpg" width="192" height="131" border="0"
alt="DSC00076.jpg"></a>

You can also do :
href="pictures/slides.html?DSC00070.jpg"
if you prefer
but take care : sensitive case (a 'D' is not a 'd')

here is your page (tested)

<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"
"http://www.w3.org/TR/1999/REC-html401-19991224/loose.dtd">
<html>
<head>
<title>Homecoming</title> <script language="JavaScript">
<!-- Original: Mike Canonigo ([email protected]) -->
<!-- Web Site: http://www.munkeehead.com -->

<!-- This script and many more are available free online at -->
<!-- The JavaScript Source!! http://javascript.internet.com -->

<!-- Begin
NewImg = new Array (
"DSC00067.jpg",
"DSC00068.jpg",
"DSC00069.jpg",
"DSC00070.jpg",
"DSC00071.jpg",
"DSC00072.jpg",
"DSC00073.jpg",
"DSC00074.jpg",
"DSC00075.jpg",
"DSC00076.jpg",
"DSC00077.jpg",
"DSC00078.jpg",
"DSC00079.jpg",
"DSC00080.jpg"
);
var ImgNum = 0;
var ImgLength = NewImg.length - 1;

//Time delay between Slides in milliseconds
var delay = 3000;

var lock = false;
var run;

function chgImg(direction) {
if (document.images) {
ImgNum = ImgNum + direction;
if (ImgNum > ImgLength) {
ImgNum = 0;
}
if (ImgNum < 0) {
ImgNum = ImgLength;
}
document.images['slideshow'].src = NewImg[ImgNum];
}
}

function auto() {
if (lock == true) {
lock = false;
window.clearInterval(run);
}
else if (lock == false) {
lock = true;
run = setInterval("chgImg(1)", delay);
}
}

function getImg() {
var startImg = self.location.search.substring(1);
for (var i=0;i<ImgLength;i++)
if(NewImg.indexOf(startImg)>0) ImgNum = +i-1;
lock == false;
chgImg(1);
auto();
}

</script>
<link rel="stylesheet" type="text/css" href="../styles.css">
<style type="text/css">
p, button { text-align: center; }
img { margin: auto; margin-bottom: 10px; width: 850px; }
p.buttons { background-color: #fc3; margin: 10px; border: 1px solid black; }
button { border: outset goldenrod 3px; background: #ff9;
color: maroon; margin: 4px 10px; width: 100px; }
button:hover { border-style: inset; }
button:active { background: orange; color: white; }
</style>
</head>
<body>
<p><img src="DSC00067.jpg" name="slideshow" width="850"></p>
<p class="buttons">
<button onclick="delay=delay*1.2;auto();auto();">Slower</button>
<button onclick="chgImg(-1)">Previous</button>
<button onclick="auto()">Auto/Stop</button>
<button onclick="chgImg(1)">Next</button>
<button onclick="delay=delay*.8;auto();auto();">Faster</button>
</p>
<script type="text/javascript">
getImg();
</script>
</body>
</html>
 
R

Richard Cornford

ASM wrote:
function auto(nbrImg) {
nbrImg = (nbrImg && nbrImg!='') nbrImg : 1;
if (lock == true) {
lock = false;
window.clearInterval(run);
}
else if (lock == false) {
lock = true;
run = setInterval("chgImg("+nbrImg+")", delay);
}
}
Click to expand...
<snip>

What a very bad example of programming. Beyond the omission of the
question mark in the conditional expression, what values for - nbrImg -
are expected to type convert to boolean true and then possibly equal the
empty string? The possible value of - nbrImg - that will producde false
in - nbrImg != '' - are boolean false, +/- zero and the empty string,
all of which either are false or would type-convert to false in the
right hand side of the logical expression.

It is invariable unwise to perform type-converting comparison with a
boolean value without a specific reason. The values that do equal true
with type-converting comparison are: boolean true, the number 1 and the
string "1". It is unusual to want to only allow this particular set of
values to trigger the entry into a branch in an if/else statement. It is
much more likely that the intention is that the - lock - value be
exclusively boolean and so that requirement would be enforced with a
strict comparison operation (===), or taken advantage of by allowing the
internal ToBoolean call implicit in the - if - expression to react to
the true-ness of the value, eliminating the then redundant comparison,
and the - if - statement in the else branch. So either:-

Only when boolean:-

if(lock === true){ //only if boolean true
....
}else if(lock === false){ //else if boolean false
...
}

-or, reacting to type-converted true-ness:-

if(lock){ // any 'true' value including boolean true
...
}else{ //else any 'false' value including boolean false
...
}

If the global - lock - variable is initialised (as it mist be for the
original function to work at all) then it would be logical to initials
it to boolean false, and then use the second if/else formulation where
only boolean values are assigned to - lock -.

Richard.
 
A

ASM

Richard Cornford a écrit :
ASM wrote:


<snip>

What a very bad example of programming. Beyond the omission of the
question mark in the conditional expression,
Click to expand...

I've seen it too late
what values for - nbrImg -
are expected to type convert to boolean true and then possibly equal the
empty string? The possible value of - nbrImg - that will producde false
in - nbrImg != '' - are boolean false, +/- zero and the empty string,
all of which either are false or would type-convert to false in the
right hand side of the logical expression.
Click to expand...

I want only to know if nbrImg exists and if is not empty
-> answer waited : false or true
boolean or not is JS's problem.

histories about 'look' are not mine

you forgot to see in thread : <script language="JavaScript">

tell all that to :
<!-- Original: Mike Canonigo ([email protected]) -->
<!-- Web Site: http://www.munkeehead.com -->
<!-- This script and many more are available free online at -->
<!-- The JavaScript Source!! http://javascript.internet.com -->

as I understood this script comes
Certainly a lot of job to correct all oldies and mal writed scripts
is waiting a good soul.
 

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