JavaScript - Creating Arrays Dynamically, Need Help Looping An Array To Make Arrays. : (

Hello there, I was having some trouble with 2D arrays (or array of arrays). Essentially, the array has 100 rows, with two columns. The first column of every row holds a name, and the second holds a sales amount. With the use of a do while loop, the user can continuously add up to 100 names and sales amounts. After all the information the user wishes to add is stored into the 2D array I'm attempting to pass that very same 2D array as a parameter to a function called printRow as can be seen in the code below:

Note: the function call and the actual function are found in two separate javascripts.

Code:

var salesPerson=new Array(100)
for (i=0; i <=100; i++)
{
	salesPerson[i]=new Array(2);	
}

var x = 0;

do
{
 
salesPerson[x][0] = getName();
salesPerson[x][1] = getSales();
x++;
}while(x != 100 && confirm("Enter more employee information?"));

printRow(salesPerson[][]);

Code:

function getName()
{
	var nameEntered = prompt("What is your first name?");
	return nameEntered;
}

function getSales()
{	
	var error;
	var salesEntered;
	
	do
	{
	 	salesEntered = prompt("What were your sales?");
	 	error = false;	 	 	
		if (isNaN(salesEntered) || salesEntered == null || salesEntered == "") error = true;			
	}while(error);	
	
	return salesEntered;
}

function printRow(salesPerson[][])
{
	for (i =0; i<salesPerson.length; i++)
	{
		document.write(salesPerson[i][0] + "     " + salesPerson[i][1]);
	}

}

At the moment I'm only looking to print the contents of the 2D array that I pass as a parameter to the document. As is, the javascipt doesn't seem to execute at all, it worked fine up until I added the printRow function call and function which leads me to believe I may not be passing it as a parameter correctly. Any tips on how to do this correctly would be greatly appreciated!

I apologize in advance for my ignorance. I'm relatively new to javascript. I am trying to dynamically create a page based on information in a .txt. So far the code works. But only for a spacific line in the .txt. I would like it to create numbered divs and fill with approprate info from .txt for each line in .txt. Does that make sense?
Any help you can provide would be greatly appriciated. Oh and I'm not worried about cross browser function this is for intra-net and all clients use Mozilla.


P.S.: I will paste full code if necessary and it is explained exactly how. Is it:

[ "my code goes here" ]

or

[code]
my code goes here
[code]

I was looking at that old Strawberry Fields problem and I thought I'd see about solving it in JavaScript. What I want is an array of chars so that I can set individual elements in the array of arrays. Strings are apparently immutable and can't directly be changed? Here's my code.

Code:

		var field = new Array();
	var string0 = "..@@@@@..............."
	var string1 = "..@@@@@@........@@@..."
	var string2 = ".....@@@@@......@@@..."
	var string3 = ".......@@@@@@@@@@@@..."
	var string4 = ".........@@@@@........"
	var string5 = ".........@@@@@........"

	for (var i = 0; i < 6; i++) {
		field[i] = new Array();
		field[i] = eval("string" + i + ".slice('')");
	}
	document.write("field's type is " + typeof field + "<br>"); // object? but it should be explicit array
	document.write(typeof field[1])  // string? it should explicitly be an array, then it was filled with array elements
	document.write(typeof field[1][2]); // string - ok, I understand this bit
	document.write(field[1].length);
	document.write("<br>");
	
	for (var i = 0; i < field.length; i++) {
		field[i] = new Array();
		for (var k = 0; k < eval("string" + i + ".length"); k++) {
			field[i][k] = eval("string" + i + ".charAt(" + k + ")");
		}
		document.write("<br>");
	}
	
	document.write("field's type is " + typeof field + "<br>"); // seriously, an object?
	document.write(typeof field[1]) // why is this an object instead of an array?
	document.write(typeof field[1][2]); // string, yeah, I understand this as well
	document.write(field[1].length);
	document.write("<br>");

Also, it looks like I can't overwrite a 1-length string that's in the array of arrays. For instance:
Code:

newField = field;
//for loops
newField[i][k] = 0; // does nothing, newField's elements remain the same.

ok so I am trying to create a function that creates an array comprised of filenames based on a given range. I.E if 2-8 is selected and a foldername of UMCP/ and a common name of college is also given, the function should return and array such as [UMCP/college2.jpg,UMCP/college3.jpg.....UMCP/college8.jpg]. Here is what I've got but the alert that should tell me the filename of the first image says it is undefined, how can i fix this?

Code:

function getArrayPhotosNames (total,count,first,last) {
				/*window.alert("get Array Photo Names");*/
				
				var folderName = document.getElementById("photofold").value;
				var Alias = document.getElementById("commonName").value;
				
				for (var i=0; i>=total; i+=1) {
					var imageNum = i+first;
					var filename = folderName + Alias + imageNum + ".jpg";
					window.alert("image will be stored as"+filename);
					photosArrayGlobal[i]= filename;
				}
				
				
				window.alert("the first photo is" +photosArrayGlobal[0]);
				var countnum = count.value;
				if (count === 0) {
					window.alert("randomize time")
					var randomArray = photosArrayGlobal.sort( randomize() );
					var randomPhoto= document.getElementById("myImage");
					randomPhoto.setAttribute("src", randomArray[photoIndexGlobal]);
				}
				else {
					var firstPhoto=document.getElementById("myImage");
					firstPhoto.setAttribute("src", photosArrayGlobal[photoIndexGlobal])
				}
				
				
			}

Code:

<HTML>

<HEAD>
<TITLE>Listing 4.4</TITLE>

<SCRIPT TYPE="text/javascript">

//DEFINE METHOD
function displayInfo() {
  document.write("<H1>Employee Profile: " + this.data[0] + "</H1><HR /><PRE>");
  document.writeln("Employee Number: " + this.data[1]);
  document.writeln("Social Security Number: " + this.data[2]);
  document.writeln("Annual Salary: " + this.data[3]);
  document.write("</PRE>");
}

//DEFINE METHOD TO GET EMPLOYEE INFORMATION
function getInfo() {
  var menu="0-Exit/1-Name/2-Emp. #/3-Soc. Sec. #/4-Salary";
  var choice=prompt(menu,"0");
  if (choice != null) {
    if ((choice < 0) || (choice > 4)) {
      alert ("Invalid choice");
      this.getInfo();
    } else {
      if (choice != "0") {
        this.data[choice-1]=prompt("Enter information","");
        this.getInfo();
      }
    }
  }
}

//DEFINE OBJECT
function employee() {
  this.data = new Array(4);
  this.displayInfo=displayInfo;
  this.getInfo=getInfo;
}

newEmployee=new employee();

</SCRIPT>

</HEAD>

<BODY>

<SCRIPT TYPE="text/javascript">

newEmployee.getInfo();
newEmployee.displayInfo();

</SCRIPT>

</BODY>

</HTML>

I am currently taking a Javascript certification course, this is a exercise given (final code)

I don't completely understand what is going on though, could someone explain to me Code:

 this.data[choice-1]=prompt("Enter information","");

that part? I don't understand why, [choice-1]

I don't fully understand why an array is even needed here?

Hi could someone help with this javascript. i dont know where to start with the script which is in bold.
Program to report the results of an election.

// candidates
var candidateArray =
['Mr R Green...', 'Ms O Brown...', 'Ms Y Black...', 'Mr G White...', 'Ms B Grey....','Ms I Blue....', 'Mr V Pink....'];
// online votes
var onlineVotesArray = [21,47,23,11,56,47,30];
// paper votes
var paperVotesArray = [12,4,20,11,5,4,17];

// total votes -- to be initialised below
var totalVotesArray;
// Add code to
// -- initialise totalVotesArray with a new empty array of the same size as candidateArray
// -- use a for loop to add the online and paper votes for each candidate and store the result at the corresponding position in the total votes array.

Hi. I am fairly new to JavaScript.
I am having some troubles with arrays.
I am using Chrome 12 beta.

Here is a brief version of the code I am having trouble with
Code:

var array=new Array()
array[0]=new Array()
array[0][1]=new Array()

var array[0][1]=[
  3, 1, 4, 1, 5, 9, 2, 6, 5, ...
];

I do not want to use "array[0][1][n]" because my array has too many items to do that and it is just plain annoying to change the numbers that way.

I get an error on the "var buffers[0][1]=[" line saying:
"Uncaught SyntaxError: Unexpected token ["

What is the problem in my code?

Thank you ahead of time.
---mint

First of all thank you for reading my thread and giving time to help me. Here goes my question:

How to sort this array?

MY PRIORITY COLORS array:
------------
green , yellow

ALL COLORS array : <---- this will be your main array.
-----------------------
pink , green , orange

THE RESULTS: ( the results after you sort) (Not sorted by alphabetically, but sorted by the priority colors)
----------------
green , pink , orange



I hope you could help me solve this javascript sorting problem.

Thank you!

How do you format a if statment for a multidemensional array.

Hi again folks!

A code I did recently was that 10 football teams had to register and the program had to ask the question "please enter your team" ten times then show the display on screen.
This code works fine and does it jobs but I realized that I did this program a long winded way (shown below) :

<script type="text/javascript">

//ask to enter names
var enteredteam1= prompt("Please enter first team.", ""); //each team is shown as different variable
var enteredteam2= prompt("Please enter second team.", "");
var enteredteam3= prompt("Please enter third team.", "");
var enteredteam4= prompt("Please enter forth team.", "");
var enteredteam5= prompt("Please enter fifth team.", "");
var enteredteam6= prompt("Please enter sixth team.", "");
var enteredteam7= prompt("Please enter seventh team.", "");
var enteredteam8= prompt("Please enter eighth team.", "");
var enteredteam9= prompt("Please enter ninth team.", "");
var enteredteam10= prompt("Please enter final team.", "");

var team= [];

team[1]= enteredteam1 //the team should equal the entered value for the space
team[2]= enteredteam2
team[3]= enteredteam3
team[4]= enteredteam4
team[5]= enteredteam5
team[6]= enteredteam6
team[7]= enteredteam7
team[8]= enteredteam8
team[9]= enteredteam9
team[10]= enteredteam10

document.write("<h1>Registered Teams</h1>");

// display the teams on the screen beside number

document.write("<b>1.</b>" + team[1]); //write the entered value on the screen
document.write("<br><br><b>2.</b>" + team[2]);
document.write("<br><br><b>3.</b>" + team[3]);
document.write("<br><br><b>4.</b>" + team[4]);
document.write("<br><br><b>5.</b>" + team[5]);
document.write("<br><br><b>6.</b>" + team[6]);
document.write("<br><br><b>7.</b>" + team[7]);
document.write("<br><br><b>8.</b>" + team[8]);
document.write("<br><br><b>9.</b>" + team[9]);
document.write("<br><br><b>10.</b>" + team[10]);

</script>



I was wondering for future references could anyone suggest a simpler code to do something similar?
For instance what if I wanted to ask the question but I didn't know how many teams were going to be entered. It would ask the question (enter your team) until the user clicked on a button saying "finished" or something.

Once again, I am new to this field, so any code with comments would be helpful!

Code:

<script type="text/javascript">
var authors = ['Ernst Hemingway','Charlotte Bronte','Dante Alighieri','Emily Dickinson'];
</script>
<script type="text/javascript">
document.write('<p>The first author is <strong>');
document.write('authors[0] + '</strong> </p>');
</script>

I'm getting a syntax error on the last line ? I can't see the error, I closed the strong tag, closed the p tag. Put the line in a string, why won't it write the string ?

is it possible to embed something like this
Code:

<object classid='clsid:D27CDB6E-AE6D-11cf-96B8-444553540000' width='450' height='24'>
<param name='movie' value='http://youtubemp3.tv/player/player.swf'>
<param name='allowfullscreen' value='false'>
<param name='allowscriptaccess' value='always'>
<param name='wmode' value='transparent'>
<param name='flashvars' value='file=http://youtubemp3.tv/mp3embed-oeduvhv516z9.mp3&duration='>
<embed src='http://youtubemp3.tv/player/player.swf' width='450' height='24' allowscriptaccess='always' allowfullscreen='false' flashvars='file=http://youtubemp3.tv/mp3embed-oeduvhv516z9.mp3&duration=' />
</object>

into a array that will randomly pull things from it like this
Code:

<input type = "button" value="Call Out a Target" onclick="myFunction()"></button>

<div id = "demo1"></div>
<div id = "demo2"></div>

<script type="text/javascript">

function shuffle(array) {
var n = array.length, k, t;
if (n == 0) {return false};
while (--n) {
k = Math.floor(Math.random() * (n+1));
t = array[n];
array[n] = array[k];
array[k] = t;
}
}


function myFunction() {

var myarray=["red","blue", "yellow", "orange"];
shuffle (myarray);
document.getElementById("demo2").innerHTML = myarray[0];

}

</script>

Thanks!!!

I am working on making 2 for loops of 2 arrays to get the total of them. Then I need to get the average heights. This is for a test, yet I have not got a clue, so I need clues as I cant get it to work and I am a new coder to javascript.

Code:

var heights = [15,16,17,18,19];
var numbers = [2,1,6,4,2];
var average = new Array(5);

average = 0

for (var heights = 0; heights <= 5; heights = heights+ 1)
{
total = 0
}
for (var numbers = 0; numbers <= 5; numbers = numbers + 1)
{
total = 0
average = heights / numbers;
}

document.write('The average height is ' + average);

Am I on the right road? I need to use this format and not functions. I have got 2 for statements but maybe I could do this with one, it is so tricky this javascript.