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richardELeach
Inspiring
August 13, 2013
Question

Test for specific array position?

  • August 13, 2013
  • 11 replies
  • 1716 views

Hi

I have a 2 dimensional array stored in sessions scope:

     <cfset Session.POarCart=#arrayNew(2)#>

and it can have as many as 7 elements (for example):

     Session.POarCart[1][1]

     Session.POarCart[1][2]

     Session.POarCart[1][3]

     Session.POarCart[1][4]

     Session.POarCart[1][5]

     Session.POarCart[1][6]

     Session.POarCart[1][7]

... however elements 6 and 7 (Session.POarCart[1][6] and Session.POarCart[1][7]) don't always get filled (or populated, or set, whatever the nomenclature....)

Does anyone know how to check if a specific array element "contains something"? "is not null"? "has length"? I can test that the array exists, and it does, but I don't know how to test for the exact position of the array.

My code is failing when I attempt to reference Session.POarCart[1][6] because it doesn't contain anything.

Anyone?

Thanks,

Rich

    This topic has been closed for replies.

    11 replies

    A
    Adam Cameron.
    Inspiring
    August 14, 2013

    What I'd like to know is why the hell you're using a two-dimensional array for what seems to be a shopping cart. It should be an array of structs, surely?

    --

    Adam

    R
    richardELeachAuthor
    Inspiring
    August 14, 2013

    ...previously stated business requirements that I inherited. Didn't know we had to present the entire use case for help on this forum.

    Your response was not helpful at all.

    Regards,

    Rich

    A
    Adam Cameron.
    Inspiring
    August 14, 2013

    How am I to know you're maintaining existing code, not writing new code?

    Because if you are writing new code, then the approach is likely to be a substandard one, so whilst you're struggling with it, now might be the perfect moment to take a step back and have a closer look at a good solution.

    Pull your head in.

    --

    Adam

    Carl Von Stetten
    Carl Von Stetten
    Legend
    August 13, 2013

    Rich,

    You could use ArrayLen() to find the length of your array.  If you find that a 6th or 7th element exists, you'd still have to check the value to see if they are empty or not.

    -Carl V.

    R
    richardELeachAuthor
    Inspiring
    August 13, 2013

    Carl

    arrayLen() only gives me the length of the entire array, it does not tell me how long each array's "entry" is. For example,

    <cfset arrayLength=arrayLen(Session.POarCartEDIT)>

    arraylength: #arrayLength#<br />

    Displays "2".

    Each array entry can have up to 7 positions; what I need is to know inside of each of the 2 array entries, is there a value of [1][6], or [1][7].

    How do you do that?

    Thanks,

    Rich

    Carl Von Stetten
    Carl Von Stetten
    Legend
    August 13, 2013

    Right, so you have an Array inside of an Array.  So <cfset arrayLength=ArrayLength(Session.POarCart[1])>.  Assuming your Session.POarCart array has multiple arrays inside, you would probably wrap the logic inside a loop, and loop over the outer array.

    <cfset innerArrayLength = 0>

    <cfloop index="i" from="1" to="#ArrayLen(Session.POarCart)#">

         <cfset innerArrayLength = ArrayLen(Session.POarCart)>

         <!--- DO STUFF HERE --->

    </cfloop>

    HTH,

    -Carl V.

    Message was edited by: Carl Von Stetten

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