Populate A Second DropDownList Based On A Selected Value From Other DropDownList

I'm trying to link two dropdownlist depending on the value you select from the first dropdownlist. What I want to do is select a value from the first dropdownlist and depending on its value show some options in the second dropdownlist. I try doing this:

1-when the OnChange event of the first dropdownlist occurs, I call a javascript that redirects to a method in a controller (for example: index/mainController/firstMethod/selectedValue).

2-the method in the controller using the url helper extracts the “selectedValue” to do a database search of the value of the second dropdownlist.

3-the same method loads the view (the one that have the ddl)

Doing this I lose the selected value of the first ddl. I think this is not the right way to do it.



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[Code]...

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<?php
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[Code]....

Here's the buttonclick:

[Code]....

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[Code]...

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[Code]....

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[Code]...

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