How can I default select all Multiselect picklist values?

Question

I have a requirement where I have to default selected all values on visual force page. I have searched everywhere but I still have no lead to work on it.

Would someone please advise how to do that using controller and visual force page please .

Answer 1

In your page do something like

<apex:selectList size="5" id="selectRev" value="{!selValue}" multiselect="true" >
    <apex:selectOptions value="{!MultiValues}"/>
</apex:selectList>

Controller:

public List<SelectOption> getMultiValues() {
List<SelectOption> options = new List<SelectOption>();
options.add(new SelectOption('value1','value1'));
return options;
}


Public string[] getselValue(){
   //Where c.Test_Multi__c would be the name of the field you are storing the value in.

   if (c.Test_Multi__c!=null)
    return c.Test_Multi__c.split(';');

   else
     return null;
}

public void setselValue(string[] vals){
   c.Test_Multi__c=string.join(vals,';');
}