How can I change drop down box #2 based on input from drop down box #1?

Question

I have two drop down menus.

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Answer 1

Assuming your dropdowns are dynamically built, I'd have your server generate a little javascript for you - the PHP code can map them, so the output looks something like:

var _languageMap = {
    { 1: 12 },
    { 2: 11 },
    ...
    { 8: 14 }
};

Then set an eventhandler on change of your first dropdown, and set the second by looking up the value from your language map. If you're using jQuery, try something like:

jQuery("#asset_id").change(function() {
    var trailerId = jQuery(this).val();
    var languageId = _languageMap[trailerId];
    jQuery("#country_id").val(languageId);
});

If you're not using jQuery, you can do the same with regular javascript - you'll just need to look up event handlers for dropdown lists - I just don't remember how to do that the old-fashioned way.