Thanks for the clear explanation. For me, it's not the use of arrays that is the problem, I'm a fan of arrays. My simple brain just has a hard time wrapping my head around when I can call the dg commands/functions directly, when I have to dispatch/send them, when I have to tag on "in zero seconds". I have been bitten by that many times!
On the other hand, the dgText is always easily accessible and I can turn it into an array if I need to. I have some homegrown handlers that are pretty much the equivalent of the dg command/functions but accessing the dgText instead of internal dg arrays and so far they have worked well for me and I have not had to worry if the scripts that use them are in the datagrid group path or not. Pete Haworth On Feb 1, 2011, at 4:01 PM, zryip theSlug wrote: > On Wed, Feb 2, 2011 at 12:29 AM, Bob Sneidar <[email protected]> wrote: >> Ok Peter helped me understand the GetDataOfIndex/SetDataOfIndex functions. I >> think when I read, "- Retrieves the internal array for key pIndex of the >> internal array in the data grid..." I just assumed that the returned value >> would always be an array. I see now that if you reference a column name for >> the second argument you get a value instead. >> > > Internally the datagrid works with arrays even if you populate with > the dgText property. > > For populating a datagrid of 3 columns with the dgData property we > could use a script such as: > > put "a1" into theData[1]["col1"] > put "b1" into theData[1]["col2"] > put "c1" into theData[1]["col3"] > put "a2" into theData[2]["col1"] > put "b2" into theData[2]["col2"] > put "c2" into theData[2]["col3"] > > Now if you transpose this code as bricks or pieces of puzzle and > encase each piece by index and column names you could get: > > theData[1]["col1"]["col2"]["col3"] > a1 b1 c1 > theData[2]["col1"]["col2"]["col3"] > a2 b2 c2 > > Now let's join the col names and extract each index > > theData["col1"]["col2"]["col3"] > 1 a1 b1 c1 > 2 a2 b2 c2 > > Then you have a double entry table: the datagrid. > > Understand how working with arrays is one of the key to understand the > datagrid object, I think. It make good sense why a name of a column > (not the label) must be filled and unique: its just a key in an array. > > getDataOfIndex simply read the corresponding value in a double entry > table such as you could do it in a spreadsheet, by using A2 or L2C1 > > > Best regards, > > -- > -Zryip TheSlug- wish you the best! 8) > http://www.aslugontheroad.co.cc > > _______________________________________________ > use-livecode mailing list > [email protected] > Please visit this url to subscribe, unsubscribe and manage your subscription > preferences: > http://lists.runrev.com/mailman/listinfo/use-livecode > _______________________________________________ use-livecode mailing list [email protected] Please visit this url to subscribe, unsubscribe and manage your subscription preferences: http://lists.runrev.com/mailman/listinfo/use-livecode
