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.


Populate A Dropdownlist Based On The Selection Made In Another Dropdownlist?

How do I automatically populate the second dropdown based on the selection made in the first one. Say if I choose a contry in the first dropdown, then I want to display a list of cities from that country in the second dropdown. Is there a way to do this with jQuery?

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it really does work. the next thing i would like to do is to insert into the database everything that were chosen that were moved to List2[] using queries with PHP and Mysql..

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(Main FORM)
<form name="NewBar" method="post" onsubmit="return validateFormOnSubmit(this)" action="AssignContactDetailToBar_f.php">
<td width="150"><b>Bar:</b></td>
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List A: Car Manufactures (honda, nissan, etc)
List B: Models (accord, civic, etc)

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Just like the title says i'm having difficulties in achieving it. Here's my dropdownlist:

$query = "SELECT data, rel_id FROM $tbl_rel_balansas INNER JOIN $tbl_balansas ON $tbl_rel_balansas.rel_id = $tbl_balansas.id WHERE $tbl_rel_balansas.member_id = '$_SESSION[id]' group by data";
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Here's the buttonclick:


After I press it, it retrieves the data I want from the date I've chosen from the drop down list and also reset whole drop down list showing the first value of the dates from sql database, not the one I selected. If anyone knows how to keep the selected value in the list

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<option value="?lang=eng">US English</option>
<option value="?lang=esp">Español</option>
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excname = dfgdg
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dummy code
if today
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<select name="my_ddl">
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When the form is posted, I want to be able to get both the $value_id and $value_text of the selected option. How can I do this?

$_POST['my_ddl'] only gets one value not both.

In asp.net I could do this simply by referring to my_ddl.Value and my_ddl.Text.

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here is the code:

<form name="psform" action="pistonsingle.php" method="post">
$display = displaymaincat(1);
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its working. it displays the data but the problem is when the user click the submit button even he/she select a certain manufacturer or model, what my code do is just display all the aircrafts and not a certain aircraft that belong to a certain manufacturer and model.

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the subname
the price
the stock in one shop
the stock of the other shop
the group name
the brandname

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Here is the selection of code at the moment.

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