Hi,

I'm trying to insert a DropDownfield into a CMSfield popup in Silverstripe 2.4.

The right value is inserted into the DB after saving. However, the Dropdownfield doesn't stay to the selected item but returns to the first. My code:

class Link extends DataObject{
  static $db = array(
    'Descript'=> 'Text',
    'ExternURL'=> 'Text',
    'InternURL'=> 'Varchar'
    
  ); 

 
  static $has_one = array( 
    'Pagina' => 'SiteTree'
  );
   
  public function getCMSFields_forPopup() {
    $fields = parent::getCMSFields();
    $fields = new FieldSet( 
      new TextField('Descript', 'Description'),
      new TextField('ExternURL', 'External link (including http://)'),
      new DropdownField('InternURL','OR Internal link:', DataObject::get("SiteTree")->toDropdownMap('ID', 'Title', '(Select one)', true)) 
    ); 
    
    return $fields; 
  }
}

Anyone a solution?

Found the solution: I got a function "getInternURL()", but that's not possible.

InternURL, your managed DropdownField should rather be in your has_one array if you want to store a relationship between Link and a SiteTree object.

static $has_one = array(
'Pagina' => 'SiteTree',
'InternURL' => 'SiteTree'
);

new DropdownField('InternURLID','OR Internal link:', DataObject::get("SiteTree")->map('ID', 'Title')))

Thanks, it works for me! However, it took me an hour to find out the ID after the InternURL.

Even easier now:

$fields->addFieldToTab('Root.Main', new TreeDropdownField('InternURL', 'Link Blok 2', 'SiteTree'));