Length of Multiple Array

[thegentleman]

Hi,

I am creating a function that requires large arrays of products split into 4 levels:

ar[0] = new Array();
ar[0][0] = new makeOption("NONE","0"
ar[1] = new Array();
ar[1][0] = new makeOption("NONE","0"
ar[2] = new Array();
ar[2][0] = new makeOption("NONE","0"
ar[3] = new Array();
ar[3][0] = new makeOption("NONE","0"
ar[3][1] = new makeOption("James Bond","11"
ar[3][1][0] = new makeOption("NONE","0"
ar[3][1][1] = new makeOption("40th Anniversary","18"
ar[3][1][1][0] = new makeOption("NONE","0"
ar[3][1][2] = new makeOption("Anniversary Expansion","19"
ar[3][1][2][0] = new makeOption("NONE","0"

I can assign the length of the first level arrays to a variable without any problem using the following code:

var curAr = ar[3].length

But I cannot seem to get the length of the second level array with the following:

var curAr = ar[3][1].length

I do not get an error but in this scenario curAr is always 0 or Null. Here is the full function:

-----------------------------------------------

function relate_s1(form) {
var options = form.cid_s2.options;
for (var i = options.length - 1; i > 0; i--) {
options = null;
}
var curAr = ar[form.cid.selectedIndex][form.cid_s1.selectedIndex];
for (var j = 0; j < curAr.length; j++) {
options[j] = new Option(curAr[j].text,curAr[j].value);
}
options[0].selected = true;

}

-------------------------------

Any ideas?

~tg

 

[BabyJeffy]

But I cannot seem to get the length of the second level array...

There is no second level array defined. I think it may have something to do with the following snippet from your code:

ar[3] = new Array();
ar[3][0] = new makeOption("NONE","0");

I think that by setting ar[3][0] to something, you revoke any attempt on the previous to create a new array.

The following code snippet sets up a similar set of arrays and alerts some information about the length of them:

<script type=&quot;text/javascript&quot;>
var myArray = new Array();

myArray[0] = new Array();
myArray[0][0] = new Array();
myArray[0][1] = new Array();
myArray[1] = new Array();
myArray[1][0] = new Array();
myArray[2] = new Array();
myArray[2][0] = new Array();
myArray[2][0][0] = &quot;Array : Option 2 : Option 0 : Option 0&quot;;
myArray[2][0][1] = &quot;Array : Option 2 : Option 0 : Option 1&quot;;
myArray[2][0][2] = &quot;Array : Option 2 : Option 0 : Option 2&quot;;
myArray[2][1] = &quot;Array : Option 2 : Option 1&quot;;

alert(myArray[0].length); // 2
alert(myArray[1].length); // 1
alert(myArray[2].length); // 2
alert(myArray[0][0].length); // 0
alert(myArray[2][0].length); // 3
alert(myArray[2][1].length); // 27
</script>

Maybe if you looked at my code snippet and then applied some of the ideas to your own... you will find a solution that suits.

See how you go... there are plenty of people here that can offer suggestions... mine may not be the most appropriate for your needs.

Jeff

 

[thegentleman]

Thanks for the input Jeff.

I adjusted the code to reflect your first point and the code now looks like this:

ar[0] = new Array();
ar[0][0] = new Array();
ar[0][1] = new makeOption(&quot;NONE&quot;,&quot;0&quot;
ar[1] = new Array();
ar[1][0] = new Array();
ar[1][1] = new makeOption(&quot;NONE&quot;,&quot;0&quot;
ar[2] = new Array();
ar[2][0] = new Array();
ar[2][1] = new makeOption(&quot;NONE&quot;,&quot;0&quot;
ar[3] = new Array();
ar[3][0] = new Array();
ar[3][1] = new makeOption(&quot;NONE&quot;,&quot;0&quot;
ar[3][2] = new makeOption(&quot;James Bond&quot;,&quot;11&quot;
ar[3][2][0] = new Array();
ar[3][2][1] = new makeOption(&quot;NONE&quot;,&quot;0&quot;
ar[3][2][2] = new makeOption(&quot;40th Anniversary&quot;,&quot;18&quot;
ar[3][2][2][0] = new Array();
ar[3][2][2][1] = new makeOption(&quot;NONE&quot;,&quot;0&quot;

But it still isn't working. I may have got myself confused here but from what you say does it mean that I cannot have an item in both 'ar[3][2]' and 'ar[3][2][0]' in the array because if I have something in 'ar[3][2][0]' then 'ar[3][2]' has to define the next level array?

I really appreciate the help.

~tg

 

[thegentleman]

Any further help with this would be greatly appreciated.

~tg

 

[BillyRayPreachersSon]

tg,

You are correct - having something in ar[3][2] that wasn't an array would mean that ar[3][2][0] wouldn't exist.

The 'parent' of any array element must be an array.

Hope this clarifies things.

Dan

 

[thegentleman]

Thanks Dan,

I eventually worked out a way around this. The reason why it got so complicated is because this is all being generated from a database.

var l1 = new Array();
var l2 = new Array();
var l3 = new Array();

l1[0] = new Array();
l1[1] = new Array();
l1[2] = new Array();
l1[3] = new Array();
l1[4] = new Array();
l1[5] = new Array();
l1[6] = new Array();
l1[7] = new Array();

l1[0][0] = new makeOption(&quot;NONE&quot;,&quot;0&quot;
l1[0][1] = new makeOption(&quot;01&quot;,&quot;0&quot;

l2[0] = new Array();
l2[0][1] = new Array();

l2[0][1][0] = new makeOption(&quot;NONE&quot;,&quot;0&quot;
l2[0][1][1] = new makeOption(&quot;011&quot;,&quot;0&quot;

l3[0] = new Array();
l3[0][1] = new Array();
l3[0][1][1] = new Array();

l3[0][1][1][0] = new makeOption(&quot;NONE&quot;,&quot;0&quot;
l3[0][1][1][1] = new makeOption(&quot;0111&quot;,&quot;0&quot;

l1[1][0] = new makeOption(&quot;NONE&quot;,&quot;0&quot;
l1[1][1] = new makeOption(&quot;11&quot;,&quot;0&quot;

This code evntually leads to 4-tear dependant drop-down lists. Thanks for all the help.

~tg