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gsarguccigsargucci 

Crazy trouble with multiselect selectList

OK, I must be going crazy because I think this was working yesterday...  I need to have a VF page with a

multiselect list, which I can't seem to get working.  Here's the simplest case I've been able to boil it

down to.

VF Page:


<apex:page controller="TestController" sidebar="false" showHeader="false">
    <apex:pageBlock title="Values" rendered="true" id="Pageid">
    <apex:form >
    <apex:pageBlockSection columns="1">
       
    <apex:pageBlockSectionItem >
      <apex:outputLabel value="Test: " for="pickTest"/>
      <apex:selectList value="{!Values}" size="4" id="pickTest" multiselect="true" >
      <apex:selectOptions value="{!ValueOptions}"/>
      </apex:selectList>
    </apex:pageBlockSectionItem>
   
    <apex:commandButton action="{!testIt}" value="Test It!"/>
    </apex:pageBlockSection>
    </apex:form>
    </apex:pageBlock>
</apex:page>

 

Controller:

public class TestController {
    private String [] m_lstVals;
   
    public void setValues (String [] lstVals)
    {
        m_lstVals = lstVals;
    }

    public String [] getValues ()
    {
        return m_lstVals;
    }
   
    public List<SelectOption> getValueOptions()
    {
        List<selectoption> lstOptions = new List<SelectOption>();
        lstOptions.add(new SelectOption ('one', 'one'));
        lstOptions.add(new SelectOption ('two', 'two'));
        lstOptions.add(new SelectOption ('three', 'three'));
        return lstOptions;
    }
   
    public PageReference testIt ()
    {
        if (m_lstVals == null)
        {
            System.debug ('No values');
            return null;
        }
       
        for (String s : m_lstVals)
        {
            System.debug ('Selected value: ' + s);
        }
       
        return null;
    }   
   
    public static testmethod void testController ()
    {
        TestController tc = new TestController ();
       
        List<SelectOption> so = tc.getValueOptions();
    }
}
 

 
 
When I select 'one' and 'two' and press the 'test It' button, I get the following in the debug log:

Conversion Error setting value 'one two' for '#{Values}'.

When I set 'multiselect' to 'false' (and change the accessor methods to just Strings) everything works 

correctly.  It must be something really silly/simple here!  Could someone take a look and point out my 

mistake?

Thanks in advance!


Best Answer chosen by Admin (Salesforce Developers) 
mattdarnoldmattdarnold
Try initializing your list first; I changed the first line of your code to the following and it is working for me now.
 
private String [] m_lstVals = new String[]{};
  
-- Matt 


All Answers
mattdarnoldmattdarnold
Try initializing your list first; I changed the first line of your code to the following and it is working for me now.
 
private String [] m_lstVals = new String[]{};
  
-- Matt 
This was selected as the best answer
gsarguccigsargucci
Hi Matt,
 
Thanks--that was it!  The bitter irony is that I'd actually seen this 'fix' before I posted, tried it, and it didn't seem to work.  I think that was because I was testing with my 'real' app, rather than the much simplified example.  In that 'real' app I had multiple fields declared that way, and changing only one to the approach that you recommned didn't seem to do the trick.
 
Interestingly, I think this used to work before some new fields in that controller got added that declarres String lists as:
 
List<String>
 
rather than:
 
String []
 
In any case, thank you very much for your help!
 


AkiTAkiT
thanks, this guided me to the roots of my similar issue. I had actually just automatic getter setter property which did not seem to work with multiple select list.


 


 


public String[] myselects{get; set;}