JavaScript - Multiple Random Link Generators On One Page

Hi

I implemented some coding tor create a random image on the page with a corresponding 'alt' tag and all was fine for a while...

Then I got ambitions and modified the script to generate code that would generate two seperate sets of random image and associated 'alt' tag pairs.... and all seemed fine for a while....

... however after having used the code on my page for a while I notice that occasionally I get a broken file link to the image which then fails to show... and shows the 'alt' text of "undefined".

All the code links to images are correct and all images DO show from time to time with the tags.... only occasionally this extra blank/undefined pair is generated. Anyone have any ideas?

Here's the code...

Code:

		<SCRIPT LANGUAGE="JavaScript">
			<!-- Begin
			// Set up the image files to be used.
			var theImages = new Array() // do not change this
			// To add more image files, continue with the
			// pattern below, adding to the array.
			
			theImages[0] = 'images/240 Images/belmarsh-peat-240.jpg'
			theImages[1] = 'images/240 Images/98-florence-rd-maidstone240.jpg'
			theImages[2] = 'images/240 Images/boxgrove-biface-240.jpg'
			theImages[3] = 'images/240 Images/Fieldwalking2-240.jpg'
			theImages[4] = 'images/240 Images/Hawkinge-Pot-240.jpg'
			theImages[5] = 'images/240 Images/Justin_Barton-240.jpg'
			theImages[6] = 'images/240 Images/StaffPages/Hadrians-Wall.jpg'
			theImages[7] = 'images/240 Images/Chilley_Farm_Pevensey240.jpg'
			// do not edit anything below this line
			
			var theImages2 = new Array() // do not change this
			// To add more image files, continue with the
			// pattern below, adding to the array.
			
			theImages2[0] = 'images/LeafletImages/Fronts/Building/Building4.jpg'
			theImages2[1] = 'images/LeafletImages/Fronts/Fieldwork/Fieldwork4.jpg'
			theImages2[2] = 'images/LeafletImages/Fronts/Finds/Finds4.jpg'
			theImages2[3] = 'images/LeafletImages/Fronts/Forensic/Forensic4.jpg'
			theImages2[4] = 'images/LeafletImages/Fronts/GeoArch/GeoArch4.jpg'
			theImages2[5] = 'images/LeafletImages/Fronts/Heritage/Heritage4.jpg'
			theImages2[6] = 'images/LeafletImages/Fronts/Landscape/Landscape4.jpg'
			// do not edit anything below this line

			var theAlts = new Array() // do not change this
			// To add more image files, continue with the
			// pattern below, adding to the array.
			
			theAlts[0] = 'Peat bog excavations at Belmarsh Prison.'
			theAlts[1] = 'An archaeological watching brief underway in Maidstone, Kent.'
			theAlts[2] = 'A flint biface hand-axe the from Boxgrove excavations, West Sussex.'
			theAlts[3] = 'Fieldwalking.'
			theAlts[4] = 'Excavation of a cremation urn at Hawkinge, Kent.'
			theAlts[5] = 'An MA Student from University College London a records ceramic vessel.'
			theAlts[6] = 'The Hadrian’s Wall Management plan was prepared in consultation with Archaeology South-East (Copyright - Image by Simon Warner).'
			theAlts[7] = 'Historic Building Recording at Chilley Farm, Pevensey.'


			var theAlts2 = new Array() // do not change this
			// To add more image files, continue with the
			// pattern below, adding to the array.
			
			theAlts2[0] = 'Building Recording Services.'
			theAlts2[1] = 'Fieldwork Services.'
			theAlts2[2] = 'Finds and Environmental Specialist Services.'
			theAlts2[3] = 'Forensic Archaeology.'
			theAlts2[4] = 'Geoarchaeological Services.'
			theAlts2[5] = 'Heritage Management Services.'
			theAlts2[6] = 'Landscape Research Services.'
			
			var j = 0
			var p = theImages.length;
			var preBuffer = new Array()
			for (i = 0; i < p; i++){
			   preBuffer[i] = new Image()
			   preBuffer[i].src = theImages[i]
			}
			var whichImage = Math.round(Math.random()*(p-1));
			
			
			
			function showImage(){
			document.write('<img src="'+theImages[whichImage]+'" border="1" alt="'+theAlts[whichImage]+'">');
			}
			
			function showImage2(){
			document.write('<img src="'+theImages2[whichImage]+'" border="0" alt="'+theAlts2[whichImage]+'">');
			}

			//  End -->
		</script>

and its called by the code...

Code:

              <SCRIPT LANGUAGE="JavaScript">
	 		 <!-- Begin
	  			showImage(); 
	 		 //  End -->
	 	    </script>

and..

Code:

              <SCRIPT LANGUAGE="JavaScript">
	 		 <!-- Begin
	  			showImage2(); 
	 		 //  End -->
	 	    </script>

Many thanks in advance.

I have a script which allows me to select random users from one select field to another and works like a charm, but...

I want to be able to get random users from one select field to multiple (lets say 2) other select fields...

So lets say that I have 5 users in the first field (select1):
James
Bill
Jennifer
Bob
Karen

Now when I press a button:
<input value="" type="button" onClick="randomusers();" />

2 users should be moved to select2 and other 2 users moved to select3.

My current script is as follows:
Code:

function randomusers(){
 
    var given = 2, used = {}, randnum, opts = $('#select1 option'), olen = opts.length, hiddiv = $('#hiddendiv');
    function ran() { // generate a unique random number
      randnum = Math.floor(Math.random() * olen);
      return used['u'+randnum] ? ran() : randnum;
    }
    for (var i = 0; i < given; i++) { // get the correct quantity of randoms
      used['u'+ran()] = true;
    }
    var players = opts.filter(function(index) { // remove all options that are not one of the randoms
      return !!used['u'+index];
    }).appendTo('#select2');
    
}

Hoping for help...

Thanks in advance :-)

Question about random link generator http://www.javascriptkit.com/script/cut1.shtml

I want to use this script to hold a hundred odd links and show 8 random urls at a time in a list separated by a couple of line breaks. (Instead of just one).


Could someone pls alter the code to allow me to do this please ...
I also hope to keep the js file off the main html page. (naming the file list.js)

Could someone also indicate how I do this.


Hopefully these questions are easy if you know how etc. So far i havent been able to do it...
Would be good if i could add a line to prevent duplicate randomly drawn links appearing in the list of eight....


thanks very much if you able to indicate it.....

Hi guys,

As a relative newcomer to Javascript this is killing me! Maybe someone can help...

I am trying to put an image on the front page of my website that changes to one of two random images on mouseover. This part was easy, and has been done (I got the code from http://www.joemaller.com/javascript/randomroll.shtml).

But what I am finding difficult is to make each image link to a different page.

For example, if the user mouseovers the main image and sees the 'thumbs up' image, then clicks on it, they should be taken to the 'thumbs up' page. And if the user mouseovers the main image and sees the 'thumbs down' image, then clicks on it, they should be taken to the 'thumbs down' page.

The site is he www.uninvitedcritic.com

I think using 2 arrays is the way to go, but am not sure. Any help would be appreciated!

hi,

I am now building my website as a final project for my year. I am doing graphic design, so the website is actually some kind of portfolio. The idea of this website (which is not yet online) is this : it is some kind of big pasteboard on which i will display all the work i have done in my academy since a couple of years. The pasteboard is at the moment a background image/color field of given dimension (i figure that was the only way to do what i wanted...see further)

Every works/image load on a random place and then can be dragged, and dropped (this part i already figured out). At the moment, every image (for every project), is inside a <div>.

What i need help for is this:
at the moment, my function successfully load 1 element at random position.
I now want this function to work separately, for every <div>, so that every image is randomly placed on load, on the background image (and not the browser window, which is smaller).

Here is the code i have for the moment (sorry for the mess, i really am just beginning! and truely, i don't get half of this, i just know it is working at the moment):


Code:

<head>

	<!--// function random start position-->
<script>

var aDOM = 0, ieDOM = 0, nsDOM = 0; var stdDOM = document.getElementById; if (stdDOM) aDOM = 1; else {ieDOM = document.all; if (ieDOM) aDOM = 1; else { var nsDOM = ((navigator.appName.indexOf('Netscape') != -1) && (parseInt(navigator.appVersion) ==4)); if (nsDOM) aDOM = 1;}}
function xDOM(objectId, wS) { if (stdDOM) return wS ? document.getElementById(objectId).style: document.getElementById(objectId); if (ieDOM) return wS ? document.all[objectId].style: document.all[objectId]; if (nsDOM) return document.layers[objectId]; }

// More Object Functions
function setObjVis(objectID,vis) {var objs = xDOM(objectID,1); objs.visibility = vis;}
function moveObjTo(objectID,x,y) {var objs = xDOM(objectID,1); objs.left = x; objs.top = y;}

// Browser Window Size and Position
function pageWidth() {return window.innerWidth != null? window.innerWidth: document.body != null? document.body.clientWidth:null;}
function pageHeight() {return window.innerHeight != null? window.innerHeight: document.body != null? document.body.clientHeight:null;}
function posLeft() {return typeof window.pageXOffset != 'undefined' ? window.pageXOffset:document.documentElement.scrollLeft? document.documentElement.scrollLeft:document.body.scrollLeft? document.body.scrollLeft:0;}
function posTop() {return typeof window.pageYOffset != 'undefined' ? window.pageYOffset:document.documentElement.scrollTop? document.documentElement.scrollTop: document.body.scrollTop?document.body.scrollTop:0;}

// Random Position Script

var xxx = Math.floor(Math.random()* (pageWidth()-230));
var yyy = Math.floor(Math.random()* (pageHeight()-50));

function start() 
{var x = (posLeft()+xxx) + 'px'; 
var y = (posTop()+yyy) + 'px'; 
moveObjTo('myobj',x,y); 
setObjVis('myobj','visible');}
window.onload = start;
window.onscroll = start;// JavaScript Document

</script>
</head>

<body bgcolor="#9A9B95" background="../website/background.jpg">


<div id="myobj" style="position:absolute" >
	<img src="oblique strategies holes.jpg" width="595" height="842" style="position:absolute" class="dragme"/>
</div>

<div id="div2">
  <img src="oblique strategies choices.jpg" width="842" height="595" style="position:absolute" class="dragme" />
</div>

</body>

now, what i really want is this function to work for every <div>

but i know there are also some flaws (that i'm unfortunately unable to fix myself):
the integers "230 and 50" in the "random position script" should be replaced byt the width and heigh of the image/div (so i guess i should find a function that can get those numbers, name them "ImgWeidth" and "ImgHeigh" so that those integer can be called in this "random position" function.
also, once the div 'myobj' is loaded, randomly, it behaves like if position=fixed (so stays on the spot when i scroll down the window). I think this is because it calculates the position according to the browser window and not my background. this has be fixed, because i don't want all my images to load only in the browser window (but on the whole pasteboard/background image).

well, i guess this is already 3 questions in one. so i will let it like that for the moment. Sorry if i'm saying too much/not enough... beginners mistake!:confused:

thanks in advance for any help you will give me!

Another homework assignment that I can't quite seem to get to work...

I've been asked to do the following using javascript:
-Create a function named randInt() with one parameter of "size". Declare a variable named "rNum" equal to a random integer between 1 and the value of the size variable. Return the value of the "rNum" varialbe from the function.

-Create a function named getQuote() with one parameter anemd "qNum". The function should create an array named mtQuotes with five quotes; there should be no quote for the array index "0". Return the value of the mtQuotes array for the qNum index.

- In the div element of "quotes" insert a script with the following commands: Declare a variable named "randValue" which is euqal to a random integer between 1 and 5 (use the randInt() function). Declare a variable named "quoteText" containing the quote whose array index value is equal to randValue. Write the value of quoteText to the web page.

Here is what I have...it returns undefined. thanks.

Code:

<html>
<head>

<script type="text/javascript">
function randInt(size) {
	var rNum=Math.ceil(Math.random()*5);
	return(rNum);
}
</script>


<script type="text/javascript">
	function getQuote(qNum);
	var mtQuotes = new Array();
	mtQuotes[0] = "";
	mtQuotes[1] = "I smoke in moderation, only one cigar at a time.";
	mtQuotes[2] = "Be careful of reading health books, you might die of a misprint.";
	mtQuotes[3] = "Man is the only animal that blushes or needs to.";
	mtQuotes[4] = "Clothes make the man. Naked people have little or no influence on society.";
	mtQuotes[5] = "One of the most striking differences between a cat and a lie is that a cat has only nine lives.";
	return mtQuotes[qNum];
</script>
</head>

<body>


     <div id="quotes">
	<script type="text/javascript">
        	var randValue=randInt(5);
	var quoteText=getQuote(randValue);
        	document.write(quoteText);
   	 </script>
   </div>

Hey All,

So to start out, this is my first post on CodingForums! I've only recently started learning web development so I figured it would be a good idea to get involved with some active forums.

I am trying to open a random page in a frame, but I am trying to call the Javascript to do so in another frame. I currently have an html page with a frameset which has two frames. One of the frames is a toolbar that sits at the top of the page and it has an image that acts as button. When the user clicks on this image, the bottom frame generates a random page from an array of links I have hardcoded into the Javascript. The bottom frame is just set to google.com as a default because I couldn't really think of anything to put in an html file there.

The problem I'm having is when I click on the image to open a random page in the bottom frame, nothing happens. The code for all the files are below.


Home.html
Code:

<head>
</head>

<frameset rows='44,*' cols="*" frameborder='no'>
<frame name="toolbar" noresize="noresize" src="toolbar.htm" marginwidth="5px" marginheight="10px" scrolling="no">
<frame name="main" noresize="noresize" src="http://www.google.com" marginwidth="5px" marginheight="5px" scrolling="auto" >
</frameset><noframes></noframes>

<body>
</body>

</html>

The code for the frame, toolbar.htm:
Code:

<head>
<title></title>
<script type="text/JavaScript" src="random.js"></script>
</head>

<body>

<div id="wrapper">
  <div id="toolbar">
    <a href="javascript:getaPage()"><img src="Images/nextpage.png" align="right" /></a>
  </div>
</div>
</body>
</html>

And finally the Javascript, random.js:
Code:

function get_random()
{
var ranNum= Math.floor(Math.random()*3);
return ranNum;
}

function getaPage()
{
var randomPage=get_random();

var page=new Array(3)
Page[0]="http://www.google.com";
Page[1]="http://www.yahoo.com";
Page[2]="http://www.myspace.com";



top.main.location.href=page[randomPage];

}

And as a follow-up question, how difficult would it be to set up this entire random page generating script via php? I'm learning php so I can eventually set up a database of urls in mysql and have tags associated with each url.

Thanks in advance!

Hello, I am using the following script on my site RCENO .com in a easyadsense plugin, it is working well, because it is adding the elements after the posts on the page, but instead of rotating (This causes a problem when a Video is playing, and it rotates out in the middle of it) I would like for it to be Random when the posts load or refreshed....This is a Wordpress CMS site that provides News and Event Information to the local area, I am using this to display Holiday Greetings from area merchants in the form of Videos.......

Thank You For Your assistance on This



<script type="text/javascript">

if (document.all || document.getElementById){ //if IE4 or NS6+
document.write('<style type="text/css">\n')
document.write('.dyncontent{display: none; width: 340px; height: 230px;}\n')
document.write('</style>')
}

var curcontentindex=0
var messages=new Array()

function getElementByClass(classname){
var inc=0
var alltags=document.all? document.all : document.getElementsByTagName("*")
for (i=0; i<alltags.length; i++){
if (alltags[i].className==classname)
messages[inc++]=alltags[i]
}
}

function rotatecontent(){
//get current message index (to show it):
curcontentindex=(curcontentindex<messages.length-1)? curcontentindex+1 : 0
//get previous message index (to hide it):
prevcontentindex=(curcontentindex==0)? messages.length-1 : curcontentindex-1
messages[prevcontentindex].style.display="none" //hide previous message
messages[curcontentindex].style.display="block" //show current message
}


window.onload=function(){
if (document.all || document.getElementById){
getElementByClass("dyncontent")
setInterval("rotatecontent()", 75000)
}
}

</script>

Season Greetings:
<div class="dyncontent" style="display: block">[flv:/files/videos/HolidayGreetings/FamilyVideoGreetings.flv 340 230]</div>
<div class="dyncontent">To Add Your Holiday Greetings, Contact Us at Roy@rceno.com or Call (336) 398-6003</div>
<div class="dyncontent">Happy Holidays</div>

Hi,
I am pretty much a noob when it comes to javascript. I am looking for a script that redirects random.html to 1 of 86 predefined pages, randomly. If someone could help me out, that would be great.

Thanks for your help

This script isnt working. Im not sure what im doing wrong. forgive me i havent programmed in javascript before.


titles.js
Code:

<script type="text/javascript" language="javascript">   
    <!--//  
 function random_Title(){
 if (parseInt(navigator.appVersion) >= 4) {  
        var num = 3;  
        var rantitle = new Array(num+1);  
        rantitle[1] = "Random Title1";  
        rantitle[2] = "Random Title1";  
        rantitle[3] = "Random Title1";  
        ranNumber = parseInt(num * Math.random() + 1);  
        document.title = rantitle[ranNumber];  
    }  
    //-->   
 }
</script>

html page
Code:

<html>
<head>

<script type='text/javascript' src='http://www.flashmajic.com/Google/titles.js'></script>
<script>
  document.title =   random_Title() ;  
</script>
</head

Hi guys,

i have posted this problem yesterday but maybe it just wasnt clear enough on what i wanted to acheiv.

basically i have 1 link throughout my site and its a "buy now" button.
i want it to be able to fetch possibly a value out my page content and then depending on that content direct the user to the correct page when they click that button?

is this feasible?

cheers,
ant.

Can a random page be loaded without a prior visit to a site?

I have a list of 15 people with a photo and contact information in a table with 3 columns and 5 rows. The issue is that the people near the bottom want a chance to be at the top the first time the page is viewed. It is unlikely that a second visit would happen.
Is this possible to load a random page for a site without it being viewed or logged into before, therefore no cookies will be used.

My knowledge of Java script code is limited so any help would be great.

Thanks

Motty

Hi. I am new here.
I wanted help for a JavaScript code.
You might think I'm lazy for not writing it myself, but the truth is I am not a JavaScript coder. I just have a really simple website and I am trying to do something for which I know JS is required but I don't know how to do it. I've also searched around but couldn't find the appropriate code.

What I want to do is to make an html page load a different background image every time it refreshes.
I will have a list of background images and I want to be able to add in this list, without having to change anything else in the codes after I do this (I think this is made by making an array of images and by putting .length somewhere in the codes, but I don't know exactly how I should do this).

I already know how to do an external file (.js) and link to it from my .html page.
Now I want the code to put in the .js file, and the code to put in the <body> of my .html file.

Please help me
Thanks