Two Dimensional Arrays
2 dimensional array is a tough concept for a lot of people to grasp.
But once it clicks, it's usually pretty easy from then on. The best
way to think of a 2 dimensional array is as a table in your database.
The first dimension would be the name of your fields across the top.
The second dimension would be your rows of information. Consider this
create a 2 dimensional array.
we've done here is create an array that in the first dimension has
2 constants which we will define in a minute. The second dimension
defines how many rows of information this array can hold, in this
case 100. Now we define the constants that will be contained in our
example_field_1 = 0
CONST example_field_2 = 1
take a look at the constants we've just defined and compare them with
the array defined earlier and the graphic shown above. When you understand
how this works, move on to the next part.
we need to assign values (or input rows) into our array. Think of
it as simply filling in info in our fields in our database table.
First we need to fill in our example_field_1 field.
= "some text"
we fill in our 2nd field in our table...keep in mind we're just using
the words table and fields to keep the picture straight. An array
does not actually contain a table and a field...it's just a concept
we're using here.
= "some more text"
we will fill in 2 more rows in our array.
cart(1,1) = "test 2"
cart(0,2) = "more stuff"
cart(1,2) = "even more stuff"
the above array with the table graphic above and you should start
to see how the two are very much alike and start to understand 2 dimensional
arrays. Now we want to loop through the contents of our array and
display them. Here's how we do it. We're going to use a for loop.
For i = 0 to ubound(cart)
<%=cart(example_field_1,i)%> : <%=cart(example_field_2,i)%>
we've done is set up a for loop, assign the value of 0 to i for the
starting point in our loop, and then assign the upper bound of our
array as the ending point of our loop. Then we loop through our array
by printing out the contents of our values. Let us know if you run
into problems or any questions by posting them on our messageboard.
I know this kind of an array can be difficult to get, but just imagine
3 and 4 dimensional arrays...arghhh. We'll deal with those sometime
later when I have had more sleep:) Good luck! See ya next time.