MYSQL_linked_select

I've tried to access the form with linked select input, exactly the file test_mysql_linked_select.php

but when I enter nothing happens. I've modified the code to fit my database but nothing happens. Some suggestion

Problem solved. bad sintax!

New Problem and new question.

How can I make a linked_selection with a multiple selection input??

And in the mysql_linked_select

what is the difference between groupsquery and optionsquery?

How could I get the values of the select_input, the right side values.

Here's an example because I'm not explaining it very well

In the test_linked_select.php file we make a select input with this values:

$countries=array(
""=>array(
""=>"Select country",
),
"na"=>array(
""=>"Select country",
"us"=>"United States",
"ca"=>"Canada"
)......
}

In the example if I choose USA, when the form is submitted you show the
right side value "United States" calling the function
$country=$form->GetInputValue("countryt");

But I really need the left value, that is "us".

Any suggestion?? Thx

Just specify MULTIPLE in the target linked select input.

That is explained in the documentation.

OptionsQuery is an SQL query string that should be executed to retrieve the list of options for a given group.

GroupsQuery is an SQL query string that should be executed to retrieve the list all groups.

No, GetInputValue gets the country codes, not the country names.

In the example it is displayed the country name by looking at $countries array.