The number of elements in a Javascript array??!?!

[sandie]

I am trying to get the number of elements in an array in Javascript. Tried "my_array.length" but this returns the length liek it says but not the number of elements.

Anyhelp will be appreciated!!!

[requestcode]

That does return the number of elements in the array. If your array is set up like this:
myarray[0]="some value"
myarray[1]="some value"

Then the statement var len=myarray.length will return 2. Since Javascript starts counting at zero instead of one then to use this in a for loop you would do this:
for(i=0;i<len;i++)
{do something}

The first time through it would reference the first entry and the second time through it would reference the second entry. Hope that helps.

[sandie]

Thanks Requestcode for replying.

Let me give a scenario:-
var my_array = new Array();
my_array[0] = "Test"
my_array[6] = "Another test"

This maybe a silly example but it's for illustration purposes only.
Now my_array.length = 7 not 2

Is there some property like
my_array."elements" which yields 2 ??????

[Garadon]

cause ur array got 7 elements 0-6

u could get the elements that is assigned a value by
var I,J=0;
var my_array = new Array();
my_array[0] = "Test";
my_array[6] = "Another test";

for(i=0;i<my_array.length ;i++)
{
if(my_array[I]!="")
{
J++;
}
}


that code would result in J being the number of elements in ur array with a value

[requestcode]

Ok now I see what you mean. I was able to get the number of elements this way:
<SCRIPT LANGUAGE="JavaScript">
var count=0
var myarray = new Array()
myarray[0]="0"
myarray[6]="1"
for(i=0;i<myarray.length;i++)
{
if(myarray[i]!=null)
{count++}
}
alert(count)
</SCRIPT>

[sandie]

Thank you very much gentleman.

Requestcode, please check my "silly" example,thoroughly.
You will notice the array has 7 elements(according to the length property) but there are only two elements indexed at 0 and 6

Garadon,I have tried it(your code), it worked.

Thanks a lot!!!!

[adios]

Just FYI:

;) Sparse Arrays. (http://caucuscare.com/~roth/JAVASCRIPT/ch08_05.htm)