For anyone else wanting to do the same I did come up with a work-around.
My multi-select list was populated with a list of records from a database table so I created another recordset on the same page (for the same table) and create a loop to write out the ID number of each record in the table separated by a comma (i.e. 1,2,3,4,5,etc). I then called this string by a variable name and in the multi-select list I entered that variable in the "selected" option. That way when I load the page all the options are selected by default - I know this means having two recordsets on the same page (for the same table) but it's not a very long table and doesn't seem to affect the speed of the page loading. |
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