Hello developers,

I'm at the end of trying, and was wondering if it is possible to have one apex:selectList control the content of another one, i've been trying to make a visualforce page where the user gets to select from a list of email templates where the list is variable based on which Folder was selected. I've tried alot of different ways, however I don't seem to be finding a solution. Could any of you point me in the right direction, or tell me what i'm doing wrong.

My VF Code:

<apex:pageBlockSectionItem >
				<apex:outputLabel value="Folder" for="folders"/>
                    <apex:selectList value="{!folderId}" size="1" id="folders" required="true">
			            <apex:selectOptions value="{!folders}"/>
			            <apex:actionSupport immediate="true" event="onchange" rerender="level2" /> 
			        </apex:selectList>
			</apex:pageBlockSectionItem>
			<apex:pageBlockSectionItem >
				<apex:outputLabel value="Template" for="templates"/>
				<apex:selectList value="{!templateId}" size="1" id="level2" required="true">
			            <apex:selectOptions value="{!templates}"/>
			        </apex:selectList>
			</apex:pageBlockSectionItem>

my apex code:

public List<SelectOption> getFolders()
	{
		List<SelectOption> options = new List<SelectOption>();
		options.add(new SelectOption(UserInfo.getOrganizationId(), 'Unfiled Public Email Template'));
		options.add(new SelectOption(UserInfo.getUserId(), 'Personal Email Template'));
		for(Folder f : folders)
		{
			options.add(new SelectOption(f.Id, f.Name));
		}
		return options;
	}
	
	public List<SelectOption> getTemplates()
	{
		List<SelectOption> options = new List<SelectOption>();
		for(EmailTemplate e : allTemplates)
		{
			if(e.FolderId == folderId)
			{
				options.add(new SelectOption(e.Id, e.Name));
			}
		}
		return options;
	}