In reference to this:
http://sqllessons.com/categories.html
Change parentid NULL to 0
Let's say I have 6 levels of subcategories.
How do I have chained select dropdown based on the main category which has a 0 value under parentid, then show it's subcategoryLevel1 > SubcategoryLevel2 > and so on.
Stops when there are no more subcategory.
$sql = "SELECT name FROM criteria WHERE parentid='0'"; //main category
** codes to show 1st level of category**
if a user selects main category with id ___
$sql = "SELECT name FROM criteria WHERE parentid='$id'"; //sub category
and loop goes on.
Please help. Thank you in advance!
Another example:
http://lvasquez.github.io/2013/08/19/dynamic-combobox-with-codeigniter/
Though it's only 1 level.
