Image changer

[Barely Audible]

Anyone recommend a good javascript image changer - preferably one that
does a random image with the ability to post a certain image on a day?

TTFN
Jim

 

[ASM]

Barely Audible a écrit :

Anyone recommend a good javascript image changer - preferably one that
does a random image with the ability to post a certain image on a day?

or it is a random image
or it is the image of the day

or do you mean : random image except on sunday ?

 

[richard8701]

Barely Audible a écrit :


or it is a random image
or it is the image of the day

or do you mean : random image except on sunday ?

It's quite simple. Please refer to a snippet here:
http://education.lcweblink.info

Choose Javascript, then Javascript Images

 

[Barely Audible]

or it is a random image or it is the image of the day

or do you mean : random image except on sunday ?

No what I meant was a random image on a normal day but on say xmas day,
easter sunday etc or any other day I nominate a certain image would be
shown.

TTFN

 

[ASM]

Barely Audible a écrit :

No what I meant was a random image on a normal day but on say xmas day,
easter sunday etc or any other day I nominate a certain image would be
shown.

So you'l have
-1- an array for images to randomize
-2- an array with your special images
-3- a function to chose image relatively to the date



var randomImages = new Array();
var specialImages = new Array();

randomImages[0] = '0.jpg';
randomImages[1] = '1.jpg';
....
randomImages[12] = '12.jpg';

specialImages[0] = 'xmas.jpg'
specialImages[1] = 'grd_pa_birthday.jpg'
....
specialImages[56] = 'grd_ma_birthday.jpg'

function choseImage() {
ar pict = '';
var i = Math.random()*randomImages.length;
i = Math.floor(i*10);
var D = new Date();
var d = D.getDate(); if(d<10) d = '0'+d;
var m = D.getMonth()+1*1; if(m<10) m = '0'+m;
D = m+d+''; // D = month + day ( = 1225 for xmas)
var k = false;
switch(i) {
case '1225': k = 0; break;
case '0228': k = 1; break;
...
case '0508': k = 56; break;
}
if(k) pict = specialImages[k];
else pict = randomImages;
return pict;
}

onload = function() { document.images['day_img'].src = choseImage(); }

 

[Dr J R Stockton]

In comp.lang.javascript message <[email protected]
r>, Sun, 25 Feb 2007 20:07:38, ASM <[email protected]
nvalid> posted:

function choseImage() {
ar pict = '';
var i = Math.random()*randomImages.length;
i = Math.floor(i*10);
var D = new Date();
var d = D.getDate(); if(d<10) d = '0'+d;
var m = D.getMonth()+1*1; if(m<10) m = '0'+m;
D = m+d+''; // D = month + day ( = 1225 for xmas)
var k = false;
switch(i) {
case '1225': k = 0; break;
case '0228': k = 1; break;
...
case '0508': k = 56; break;
}
if(k) pict = specialImages[k];
else pict = randomImages;
return pict;
}

No point in choosing your random i until you know it's needed.

One can simplify - consider :

function Random(M) { return Math.floor(M*(Math.random()%1)) }

SI = []
SI[1225] = "Xmas.pic"
SI[229] = "Leap.pic"

RI = ["P0", "P1", "P2"]

D = new Date("2024/02/29")
i = (D.getMonth()+1)*100 + D.getDate()

pict = SI

if (!pict) pict = RI[Random(RI.length)] // FAQ function

pict

 

[ASM]

Dr J R Stockton a écrit :

In comp.lang.javascript message <[email protected]
r>, Sun, 25 Feb 2007 20:07:38, ASM <[email protected]
nvalid> posted: (...)
No point in choosing your random i until you know it's needed.

Hello Doc,

Sure you're right
But ... you know ... and I allready said :
not too much difficult in first approach

Thanks for the shorter view point.

 

[ASM]

David Golightly a écrit :

var randomImages = new Array();
var specialImages = new Array();

randomImages[0] = '0.jpg';
randomImages[1] = '1.jpg';
...
randomImages[12] = '12.jpg';

specialImages[0] = 'xmas.jpg'
specialImages[1] = 'grd_pa_birthday.jpg'
...
specialImages[56] = 'grd_ma_birthday.jpg'

Or (nowadays more common):
var randomImages = ['0.jpg', '1.jpg', '2.jpg', /*...*/ '12.jpg'];

but perhaps less comprehensive ?

Or:

function randomImage(n) { return n+'.jpg'; }

no, because I suppose images could have "normal" names
(as those "special")
I wouln't have had to give them index of array as name :-(

Do you mean "D" ?

it could be :-/

case '1225': k = 0; break;
case '0228': k = 1; break;
...
case '0508': k = 56; break;
}
if(k) pict = specialImages[k];

So what happens if i == '1225'?

Are you mad ? why not 125546789 images ?
Hope OP uses only 3 or 4 images
(999 images could be enough no ?)

else pict = randomImages;

Maybe:

// For your normal images:
images = ['1.jpg', '2.jpg' /* ... */ ];

yeap, but it is for lighted users.

// Then, for your special images:
images['1225'] = 'xmas.jpg';
// etc.
// if you have less than 1000 rotating images and your dates always
have 4 digits, just index the array:

if (!(D in images)) D = i;
return images[D];

instead of the switch statement. You keep all your indexing in one
place that way, and don't have arbitrary 'go-between' indices.

Just some thoughts.

not bad, not bad

-David

I ask myself why anybody did answer to this question, if so much guys
know better how to do and how to teach it.