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Discuss SilverStripe Widgets.

Moderators: martimiz, Sean, Ed, biapar, Willr, Ingo, swaiba

TreeDropdownField doesn't work with widget

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12 Posts   7686 Views


Forum Moderator, 4102 Posts

29 January 2009 at 3:32am

Why do you have it extending ImageWidget? It's a subclass of DropdownField. Use the code as I gave it to you, and add the class anywhere in your ImageWidget.php file.

Then you can add new SimpleTreeDropdownField to your fieldset.


Community Member, 14 Posts

9 February 2010 at 3:11pm

UncleCheese, thanks very much for the workaround class. I especially like the way you can just change the name from TreeDropdownField to SimpleTreeDropdownField in the fieldset and it works.


Community Member, 245 Posts

18 May 2011 at 8:44am

I too am using SimpleTreeDropdownField in getCMSFields_forPopup() and it works fine (thanks as always @UC). Question, though, in my DataObjectManager, I'd like to get the Title of the selected page in the SiteTree to display instead of the ID. In my DataObject, I've got:

public static $has_one = array(
     "LinkedPage" => "SiteTree"
public static $field_names = array(
     "Title" => "Title",
     "PageName" => "Link to Page",
     "Content" => "Content"
public function PageName() {
    $Page = DataObject::get_by_id("SiteTree", $this->LinkedPageID);
     return $Page->Title;

But obviously I'm getting an "Unknown column 'PageName' in 'field list'" when I click on the page in the CMS. Any idea how I can accomplish what I want here?

Thanks again,


Community Member, 1 Post

30 November 2012 at 3:33am

Edited: 30/11/2012 3:34am

I've found where is the problem in using the TreeDropDownField in Widgets (in SS 2.4.7), and I have a simple workaround for that.

The problem is that the method Form::handleField() is not able to find and return the field to the ajax call that is thrown when you click on the dropdown.

Since, in cms/javascript/WidgetAreaEditor.js the name of dropdown fields that are in widgets are overwritten with the string "Widget_TDF_Endpoint", it suffices then to modify the sapphire/forms/Form.php and add this few lines to the handleField method (those between START_MOD and END_MOD):

	function handleField($request) {
		$field = $this->dataFieldByName($request->param('FieldName'));
		if($field) {
			return $field;
		} else {
			//START_MOD: TreeDropdownField in Widgets
			$fieldName = $request->param('FieldName');
			if ($fieldName == 'Widget_TDF_Endpoint') {
				return new TreeDropdownField($fieldName, null, 'SiteTree');
			// falling back to fieldByName, e.g. for getting tabs
			return $this->Fields()->fieldByName($request->param('FieldName'));

I hope this helps.

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