Trying to remove/hide fields in custom tab in SilverStripe - php

Question

I am trying to figure out a way (if possible) to remove or hide certain fields in a custom tab. The custom tab is labeled "Rotator" and it holds images that can be used for a rotating banner on a page. The home page banner is a little different in that it has 2 extra fields that aren't needed on the subpages: BackgroundImage and Body(which is meant to hold a variety of text). I want to make things simple for the content manager, so I want to hide these fields on the subpages.
I am aware of removeFieldFromTab and how it works, and I was thinking of using it on the Page.php file (since that is basically the main template for all page types in my SilverStripe file):
public function getCMSFields() {
$fields = parent::getCMSFields();
$gridFieldConfig = GridFieldConfig_RecordEditor::create();
$gridFieldConfig->addComponent(new GridFieldBulkImageUpload());
$gridFieldConfig->addComponent(new GridFieldSortableRows('SortOrder'));
$gridFieldConfig->getComponentByType('GridFieldDataColumns')->setDisplayFields(array(
// field from drawer class => label in UI
'ID' => 'ID',
'Title' => 'Title',
'Thumbnail' => 'Thumbnail',
'InternalURL.Link' => 'Internal URL',
));
$gridfield = new GridField(
"Rotator",
"Rotator",
$this->Rotator()->sort("SortOrder"),
$gridFieldConfig
);
$fields->addFieldToTab('Root.Rotator', $gridfield);
$fields->addFieldToTab("Root.Main", new TextField("H1"), "Content");
$fields->addFieldToTab("Root.Main", new TextField("Subheader"), "Content");
$fields->addFieldToTab('Root.Main', new TextField('PageTitle', 'Page Title'), 'MetaDescription');
$fields->removeFieldFromTab('Root.Rotator', 'Body');
$fields->removeFieldFromTab('Root.Rotator', 'BackgroundImage');
return $fields;
}
Here is the code for the Rotator class:
<?php
class RotatorImage extends DataObject {
public static $db = array(
'SortOrder' => 'Int',
'Header' => 'varchar',
'Body' => 'HTMLText',
);
// One-to-one relationship with gallery page
public static $has_one = array(
'Image' => 'Image',
'BackgroundImage' => 'Image',
'Page' => 'Page',
'InternalURL' => 'SiteTree',
);
// tidy up the CMS by not showing these fields
public function getCMSFields() {
$fields = parent::getCMSFields();
$fields->removeFieldFromTab("Root.Main","PageID");
$fields->removeFieldFromTab("Root.Main","SortOrder");
return $fields;
}
// Tell the datagrid what fields to show in the table
public static $summary_fields = array(
'ID' => 'ID',
'Title' => 'Title',
'Thumbnail' => 'Thumbnail',
'InternalURLID' => 'Internal URL',
);
// this function creates the thumnail for the summary fields to use
public function getThumbnail() {
return $this->Image()->CMSThumbnail();
}
public function canEdit() {
return true;
}
public function canDelete() {
return true;
}
public function canCreate(){
return true;
}
public function canPublish(){
return true;
}
public function canView(){
return true;
}
}
However this does not work, and I am sure that I have the fields names correct. I tried 'Root.Rotator.Main' and 'Root.Rotator.Content' just to see what would happen and those also did not work. What am I missing? Is it possible to hide fields on a custom tab this way, or do I need to try something else?

Answer 1

well, you want to hide the fields in the gridfield detail form? that cannot be done in your pages getCMSFields(), as the grid is responsible for generating the detail form. Two possible solutions:
1) tell the grid to hide that fields with a custom component. I dunno how to do it
2) tell your Rotator class to show the fields ONLY if the related page is a homepage:
public function getCMSFields() {
$fields = parent::getCMSFields();
//...other stuff....
$isOnHomePage = ($this->Page() && $this->Page()->ClassName == 'HomePage'); //put in your own classname or conditions
if(!$isOnHomePage) {
//remove the fields if you're not on the HomePage
$fields->removeByName('Body');
//we need to suffix with "ID" when we have a has_one relation!
$fields->removeByName('BackGroundImageID');
}
return $fields;
}

Answer 2

This will work...
$fields->removeByName('FieldName');