hello group,
I have a long (large) script that shows a random picture when a
webpage is refreshed. It's long because i have a lot of pictures: 246
Here is some code:
-----------------------------------------------------------------------------------------------
<!--
image1="smallpi cs/001-smallpic.jpg"
alt1="Ugly little picture!"
image2="smallpi cs/002-smallpic.jpg"
alt2="Ugly little picture!"
<<<you get the idea???>>>
image244="small pics/244-smallpic.jpg"
alt244="Ugly little picture!"
image245="small pics/245-smallpic.jpg"
alt245="Ugly little picture!"
image246="small pics/246-smallpic.jpg"
alt246="Ugly little picture!"
len=246
now=new Date()
now=now.getSeco nds()
rnd=now%len
image=eval("ima ge"+rnd)
alt=eval("alt"+ rnd)
document.write( "<img src='" + image + "' alt='" + alt + "'
border=0></a>")
//-->
-----------------------------------------------------------------------------------------------
Can someone make it shorter for me?
The number of pics will grow and grow and i don't want to
copy/paste/adjust the [image***=] every time.
The pics are in seperate map on server.
The server does not support php :-(
Hope to hear from you.
tia
kind regards,
Buchw@ld 5 1214
Buchwald said the following on 2/19/2006 12:53 PM: hello group,
I have a long (large) script that shows a random picture when a webpage is refreshed. It's long because i have a lot of pictures: 246
Its long because you wrote it wrong. It is also bad code.
Here is some code: -----------------------------------------------------------------------------------------------
<!--
If all the pictures are named as you have them, the image# variable is
not needed.
image###="small pics/###-smallpic.jpg"
Is the format for the image name. You can generate that without having
to define it 246 times.
Then you create an Array to hold the alt text:
var altText = new Array();
altText['001'] = "Alt text for image 001";
altText['002'] = "Alt text for image 002";
....
altText['245'] = "Alt text for image 245";
altText['246'] = "Alt text for image 246"; len=246
len now equals altText.length, no need to hard-code it. now=new Date() now=now.getSeco nds() rnd=now%len
function Random(x) { return Math.floor(x*Ma th.random()) }
rnd = Random(altText. length);
image=eval("ima ge"+rnd)
eval, and it's use, especially in this case, is indicative of bad code.
It's not needed.
imageRef = window['image' + rnd];
But, it is not needed.
alt=eval("alt"+ rnd)
ditto.
document.write( "<img src='" + image + "' alt='" + alt + "' border=0></a>")
document.write( '<img src="img'+rnd+' smallpics/'+rnd+'-smallpic.jpg"
border="0" alt="'+altText[rnd]+'">');
all on one line. -----------------------------------------------------------------------------------------------
Can someone make it shorter for me?
var altText = new Array();
altText['001'] = "Alt text for image 001";
altText['002'] = "Alt text for image 002";
.......
altText['245'] = "Alt text for image 245";
altText['246'] = "Alt text for image 246";
function Random(x) { return Math.floor(x*Ma th.random()) }
rnd = Random(altText. length);
document.write( '<img src="img'+rnd+' smallpics/'+rnd+'-smallpic.jpg"
border="0" alt="'+altText[rnd]+'">');
But, all of that would be better done on the server.
Now, all you have to do is add an altText'###' definition.
--
Randy
comp.lang.javas cript FAQ - http://jibbering.com/faq & newsgroup weekly
Javascript Best Practices - http://www.JavascriptToolbox.com/bestpractices/
JRS: In article <fM************ ********@comcas t.com>, dated Sun, 19 Feb
2006 13:20:43 remote, seen in news:comp.lang. javascript, Randy Webb
<Hi************ @aol.com> posted : var altText = new Array(); altText['001'] = "Alt text for image 001"; altText['002'] = "Alt text for image 002"; ...... altText['245'] = "Alt text for image 245"; altText['246'] = "Alt text for image 246";
function Random(x) { return Math.floor(x*Ma th.random()) } rnd = Random(altText. length); document.write ('<img src="img'+rnd+' smallpics/'+rnd+'-smallpic.jpg" border="0" alt="'+altText[rnd]+'">');
But, all of that would be better done on the server. Now, all you have to do is add an altText'###' definition.
Was that tested?
There seems to be extra material after src= and the indices should
perhaps be not strings '001' to '246' but numbers 0 to 245 (or add one
to rnd) and rnd may then need extending to three digits.
Question :
The FAQ has that code for generating a random Number in 0..N-1 ; from
that one can build a random string of M digits representing 0..N-1. Is
there a better way, and if so might it be worth having in the FAQ?
S = String(Random(N )+1e10).substr( 11-M)
( String.substr(-M) does not work for me)
OP : please use an informative Subject line.
--
© John Stockton, Surrey, UK. ?@merlyn.demon. co.uk Turnpike v4.00 IE 4 ©
<URL:http://www.jibbering.c om/faq/> JL/RC: FAQ of news:comp.lang. javascript
<URL:http://www.merlyn.demo n.co.uk/js-index.htm> jscr maths, dates, sources.
<URL:http://www.merlyn.demo n.co.uk/> TP/BP/Delphi/jscr/&c, FAQ items, links.
Dr John Stockton said the following on 2/19/2006 6:17 PM: JRS: In article <fM************ ********@comcas t.com>, dated Sun, 19 Feb 2006 13:20:43 remote, seen in news:comp.lang. javascript, Randy Webb <Hi************ @aol.com> posted : var altText = new Array(); altText['001'] = "Alt text for image 001"; altText['002'] = "Alt text for image 002"; ...... altText['245'] = "Alt text for image 245"; altText['246'] = "Alt text for image 246";
function Random(x) { return Math.floor(x*Ma th.random()) } rnd = Random(altText. length); document.write( '<img src="img'+rnd+' smallpics/'+rnd+'-smallpic.jpg" border="0" alt="'+altText[rnd]+'">');
But, all of that would be better done on the server. Now, all you have to do is add an altText'###' definition.
Was that tested?
Yes it was. There seems to be extra material after src= and the indices should perhaps be not strings '001' to '246' but numbers 0 to 245 (or add one to rnd) and rnd may then need extending to three digits.
Indeed there is extra, unneeded, material after the src=. There are more
errors/problems than just that though.
If the random number is between 1 and 100 then the script will fail. It
needs a routine to pad it to three digits. Dropping the array index as a
string and using digits removes that problem.
Question : The FAQ has that code for generating a random Number in 0..N-1 ;
The FAQ entry, to me, is misleading.
4.22 How do I generate a random integer in [1..N]?
function Random(x) { return Math.floor(x*Ma th.random()) }
Implies that Random gives that 1...N range. Even though it says in the
next sentence that it returns 0...(N-1).
--
Randy
comp.lang.javas cript FAQ - http://jibbering.com/faq & newsgroup weekly
Javascript Best Practices - http://www.JavascriptToolbox.com/bestpractices/
JRS: In article <3-*************** *************** @comcast.com>, dated
Sun, 19 Feb 2006 23:48:14 remote, seen in news:comp.lang. javascript,
Randy Webb <Hi************ @aol.com> posted : Question : The FAQ has that code for generating a random Number in 0..N-1 ;
The FAQ entry, to me, is misleading.
4.22 How do I generate a random integer in [1..N]?
function Random(x) { return Math.floor(x*Ma th.random()) }
Implies that Random gives that 1...N range. Even though it says in the next sentence that it returns 0...(N-1).
It's not the _next_ sentence; and ISTM that the part which you did not
quote explains, for those who need it, about adding 1. Its full
wording, references apart, is :-
4.22 How do I generate a random integer in [1..N]?
function Random(x) { return Math.floor(x*Ma th.random()) }
gives a random number in the range 0..(x-1); Random(N)+1 for [1..N]
But you could suggest that " use" should be inserted after the
semicolon.
--
© John Stockton, Surrey, UK. ?@merlyn.demon. co.uk Turnpike v4.00 IE 4 ©
<URL:http://www.jibbering.c om/faq/> JL/RC: FAQ of news:comp.lang. javascript
<URL:http://www.merlyn.demo n.co.uk/js-index.htm> jscr maths, dates, sources.
<URL:http://www.merlyn.demo n.co.uk/> TP/BP/Delphi/jscr/&c, FAQ items, links.
Dr John Stockton said the following on 2/20/2006 5:42 PM: JRS: In article <3-*************** *************** @comcast.com>, dated Sun, 19 Feb 2006 23:48:14 remote, seen in news:comp.lang. javascript, Randy Webb <Hi************ @aol.com> posted : Question : The FAQ has that code for generating a random Number in 0..N-1 ; The FAQ entry, to me, is misleading.
4.22 How do I generate a random integer in [1..N]?
function Random(x) { return Math.floor(x*Ma th.random()) }
Implies that Random gives that 1...N range. Even though it says in the next sentence that it returns 0...(N-1).
It's not the _next_ sentence;
My apologies King John. But anybody with common sense wouldn't have been
confused by what I said.
and ISTM that the part which you did not quote explains, for those who need it, about adding 1. Its full wording, references apart, is :-
4.22 How do I generate a random integer in [1..N]?
function Random(x) { return Math.floor(x*Ma th.random()) }
gives a random number in the range 0..(x-1); Random(N)+1 for [1..N]
But you could suggest that " use" should be inserted after the semicolon.
The entry, and its explanation, is misleading. Think what you want.
--
Randy
comp.lang.javas cript FAQ - http://jibbering.com/faq & newsgroup weekly
Javascript Best Practices - http://www.JavascriptToolbox.com/bestpractices/ This thread has been closed and replies have been disabled. Please start a new discussion. Similar topics |
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