# Iterate Array And Grab X Numbers Based On Pointer?

Jul 1, 2009

I'm trying to figure out how to do this via Javascript.

Lets say I have an array like so:

var myArray = [11, 33, 44, 23, 32, 43];
var finalArray = new Array();

And I have the following variables

var lastNumber = 33;
var getNext = 2;

I want to use the lastNumber for a starting point in the array and then based on getNext, grab the next x numbers that getNext specifies and shove into finalArray.

That case moves forward in the array.

Second case would be the opposite, get the previous x numbers based on getPrevious in the array. So I'd start at lastNumber and then grab x numbers before it based on getPrevious.

var lastNumber = 33;
var getPrevious = 2;

I'm not sure if you can traverse backwards in JavaScript. But more importantly I'm not sure how to point to lets say 33. How can I do myArray[1] essentially based on I'm pointing to 33 and then how can I grab the next x in myArray ?

## For In To Iterate Sparse Array

Jul 10, 2007

I know that using for in loop to iterate over array elements is a bad
idea but I have a situation where it is tempting me to use it. I have
a two dimensional sparse array say "arr" which will have length to be
some 50 but will have some elements like arr[1], arr[10], arr[23] at
random locations. Each of these elements is again an array (since it
is two dimensional) say arr[1][30], arr[1][24] & so on for arr[10 &
23] also. Currently I've coded it like this:

for (var i = 0; i < arr.length; i++) {
for (var j = 0; j < arr[i].length; j++) {
if (arr[i] && arr[i][j]) {
// do stuff with arr[i][j]
}
}
}

but i am tempted to do following

for (var i in arr) {
if (!arr.hasOwnProperty(i)) {
continue;
}
for (var j in arr[i]) {
if (arr[i].hasOwnProperty(j)) {
// do stuff with arr[i][j]
}
}
}

thinking it to be faster. What are your views?

## Iterate Through An Array Using CharAt?

Sep 14, 2010

In this program i attempting to iterate through an array using the charAt () function and then store these element positions in a new array called elementPositions.

The user selects a flightDestination from the flightDestinations array which is stored elsewhere, and what my program needs to do, is find all the array elements positions where the same flight destination name occurs in my array.

I then need to store these positions so i can use them elsewhere, and i'm pretty sure i need to use charAt() but i think my syntax may be wrong - contained in the for loop.

var title = "<B>" + "You asked about Flights to " + "<B>" + "<BR>";
var flightInfo;
var solution = "";

[Code]....

## Iterate Through An Anonymous Array?

Oct 11, 2009

Is it possible to iterate through an anonymous array of strings with a for loop?

Here's what I'm trying to do:
for ( i in ['country', 'city', 'state'] ) {
doSomethingWithString(i);
}

What I want is the string, but what I'm getting is the index number of the array, which I can't use because the array isn't named.

## Using A String As A Pointer To An Array?

Apr 26, 2011

So i've written up the code to do a lightbox esque overlay image gallery. everything is working smooth and fine. The only concern is that I have the following:

lets say that I have a page that has multiple galleries. Obviously I would have to make each literal array with the gallery data different names, ex:

var _gallery1 = {
'images': [
{ 'id' : 1, 'src' : "" }
]

[Code]....

obviously "galVariable" would be undefined... as i'm trying to get "_gallery2.images" but trying to use "galVariable" to point to "_gallery2"

I'm familiar with solving a problem like this in PHP, not so much javascript. is there a JS function that can be used to ensure that it's using whatever "galVariable" equals to, and then that array's content is? Or is there a different way to go on about this.

## Need To Display Id Of The Element Under The Pointer Below The Current Pointer Location

Apr 21, 2007

Is there a way of displaying the id of the element under the pointer ?

Please dont ask why I need it, but I do, i found tools that needs
installation that provide the same funcitonality. However, I would
like to turn on this feature using a flag in my url. Something like
debug=1.

## JQuery :: Using JQuery.each() To Iterate Through An Array Of Objects

May 5, 2010

I'm trying to interate through an array of objects. Here's my code:

\$('form').submit(function(){
var serializeArr = \$(this).serializeArray();
jQuery.each(serializeArr, function(i, obj){
}
});

However, this just fails. It seems like its getting stuck on the serializeArray aka an array of objects. I've gone the for loop route and it worked fine up until I started doing some ajax stuff...the variable binding behavior was all over the place and unusable.

## How To Print Out Numbers Array

Dec 10, 2010

I have an assignment that just asks you to input some numbers and then if the number isn't between 100-999 just to enter the final number and whatever the final number is to print out everything that is less then that number. For example: I enter 120, 128, and 1. It will then prompt me to enter the final number which I put 124. Now I have it set as 124 so everything less than 124 it will print. So I want the array to print 124, 120 and 1.

Code so far:
<html>
<title>Homework 5</title>
<body>
<script>
var num = new Array();
var x = 0;
var lastnum;
for (x = 0; x < 3; x++){
num[x] = window.prompt("Please enter a number between 100-999:");
if((num[x] < 100) || (num[x] > 999)){
lastnum = window.prompt("Enter your last number:");
for (x = 0; x < 1; x++){
num.sort();
} break;
</script>
</body>

## Sort Array Of Numbers And Letters

Jul 6, 2010

I have an array which is populated by a count of instances from another array, so its ends up with data like:

I need to sort this by the number before the 'x'.

At present, a .sort() would put 1 - 9 before anything greater than 10, obviously not what I'm after.

How can I make it put this array into the correct order (e.g 22 x something else, 17 x another event, 5 x that event, 2 x this event)

## Sum Of An Array - Ignoring The Spaces Between Numbers?

Nov 9, 2010

I want to get the sum of all numbers in an text area irrespective of the spaces before between or after them. e.g. " 1 2 12 15 " =30

In the code below I can have multiple spaces or CR between numbers and it works giving me their sum But if i have a space before the first number or after the last number I get a NAN (

<html>
<title>Calc Numbers</title>

[code]....

## Array Sort With Numbers And Strings?

Jun 23, 2011

I use the below file function to sort the html table

[Code]...

## Array :: How Would I Make The Buttons For The Numbers?

Jul 30, 2011

I am starting to learn javascript and have been trying to make a image gallery. I was hoping to take an array of src and create a link for each one which when clicked on changes the src of an already existing img.My question though is how would I make the buttons for the numbers.I feel like a loop would work for this but I just can't seem to figure it out. I don't know how far off I am in thinking that through a loop I could create functions with a name plus the i variable.And in each function there could be something like:

Code:
document.images["destination"].src = images[i]
That would then produce an <a> with the href equal to the function name + "i" with the title being "i" as well.

Am I way off? How would I execute that? A little explanation about my code. I am going to be using a loop to add the images that will vary in amount for each page that is why I have the push function just for this test. And the document.ready is because I've been using some jQuery.

Code:
<script type="text/javascript">

## Multiple Array And Random Numbers ?

Nov 10, 2010

I have a quick question with multiple array and random numbers. If i generate my random numbers in one array, how would i take a selection of those numbers and put them in another array?

Ex: array 1: 25, 34, 38, 40, 22, 49

Want to move numbers between 30 and 50 to another array.

array 2: 34, 38, 40, 49

Is it as simple as for loops and if statements setting the conditions? do i use a sorting method? (selection? bubble?)

## Using For Loop To Give An Array 10 Random Numbers?

Feb 18, 2009

I am working on a problem that wants me to use a for loop to give an array a random number for each of it's elements (total of 10) and then using a second loop to add them up and display the result.

<script type="text/javascript">
var sum;
var i=0;

[code]....

## Create An Array Of Numbers Counting From 1 To A Given Number?

Mar 20, 2009

I just want to create an array of numbers counting from 1 to a given number.

At the moment I have the for loop running like this:

var i=0;
for (i=1;i<=10;i++)
{
if (i == 1)

[Code]....

This outputs 1, 2, 3, 4, 5, 6, 7, 8, 9, 10

How can I put this output into this variable: 'var ids' so I get out

var ids= [1, 2, 3, 4, 5, 6, 7, 8, 9, 10];

## Output Two Maximum Numbers Of An Array If They Are Equal?

Jun 20, 2010

How can i output two maximum numbers of an array if they are equal?

var flower["roses", "violets", "buttercups", "daisies"];
var flowerAmounts[9, 8, 3, 9];

Output should be: The maximum amount of flowers is 9. There are 9 roses and 9 daisies.

## Array Sort Function Sorts On Chars Not Numbers

Jul 23, 2005

My question is ... How do I sort an Array on numeric, not character values ?

In the example below, after sorting the contents are 1,10,2,3 .

How do I get the contents to be 1,2,3,10 ? Code:

## Create A 4 X 4 Array Filled With Numbers Input By The User?

Jul 15, 2010

I'm trying to create a 4 x 4 array filled with numbers input by the user. I then need to rotate the grid clockwise like I've shown below.

01 02 03 04
05 06 07 08
09 10 11 12
13 14 15 16

13 09 05 01
14 10 06 02
15 11 07 03
16 12 08 04

I made all numbers double digit just for show in the example so the table is easier to read. So far the code I have is just trying to create the array and fill with numbers from the user. This asks for a number once then doesn't display anything at all.

<html>
<title>Rotate Array Matrix</title>
<body>

[Code].....

## Numerical Array - Convert The Inputs To Numbers Instead Of Strings?

Mar 29, 2011

convert the inputs to numbers instead of strings?I'm trying to make a calculator of sorts

var array = new Array();
function insert(val)
{[code].....

## String Variable Replace Index Numbers In Array

Jul 8, 2010

I have a string variable coming from a database, like 2,3,1,4,5,6,7.

The string is gotten from: <%=(Recordset2.Fields.Item("neworder").Value)%>.

And, have the following:

Is it possible to use the string variable to replace the index numbers so there will be a new position of the array?

## Generate Random Numbers 0-8 To Use To Access Array Indices

May 5, 2009

I'm trying to generate random numbers 0-8 to use to access array indices.[code]Every once in a while, I'm getting a -1 in my console log. I read on a site that this line:[code]will generate a number between 0 and 10 (so 1-9).How is -1 being generated?

## Browser To Display Numbers 0 Through 3 In A Vertical Appearance Using A Do/while Loop With An Array

Jul 15, 2009

Using the code below: I'm expecting the browser to display the numbers 0 through 3 in a vertical appearance using a do/while loop with an array!

<body>

## Find The Average Of The Values In An Array Of Numbers Passed As Argument To A Function?

Apr 20, 2009

How do i use a function to find the average of the values in an array of numbers passed as argument to a function.(using java script) thank you for your help...

## Make 422 (numbers) Works The Same Way As Just String Values In The Array/object Tree?

Oct 16, 2010

I have JS object w/ following structure:

PHP Code:

json_data_object.422.name

thta should of out put me "hello world" as it is what it is in array but it does not as there is 422 there That's my ID from database, and I gotta use itNow, if I change that ID to something in letters say to "i" then everything is fine. ex

PHP Code:

json_data_object.i.name

That one would work, but then I have to chnge JSON string thta pulls data from DB and i cant really do that...So the question is how can I make 422 (numbers) works the same way as just string values in the array/object tree?

## Joining Array Elements Based On Last Character

Sep 3, 2011

I have an array of strings. Some of the strings have a continuation character at the end (in this case '='). What I need to do is append the element that contains that character (eliminating it) with the next element and reduce the size of the array by 1. My problem is arising (I used variations of split/join) when that character occurs someplace other than the end of the string. How can I check the last character in a string element and join it with the next string element? TIA. I can do it using brute force but am looking for something more elegant if possible.

Code:
for (\$i=0; \$i<\$lines.length; \$i++) {
if (\$lines[\$i].substr(\$lines[\$i].length-1)=="=") {
\$lines[\$i]=\$lines[\$i].substr(0,\$lines[\$i].length1)+\$lines[\$i+1];
\$lines.splice(\$i+1,1);
\$i--;
}
}

## Collect All Divs In Array Based On Regex?

Apr 8, 2010

I am trying to get all the div tags in my page into an array but only the tags with the ID "image**". Below is what I came up with but this doesn't seem to work, even after googling a bit I couldn't find any solution. I can't seem to come up with a solution.

function divs() {
var divs = document.getElementsByTagName('div');
var ImageTags = [];
for (i=0; document.getElementsByTagName('div').length; i++) {

[Code]....