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Form Questions

Images next to checkboxes -> Fatal error: Call to a member function getURL() on a non-object


6 Posts   1223 Views


28 August 2013 at 1:06am Community Member, 17 Posts


I'm trying to create a form where the visitor of the website can buy a book/catalog. The visitor should be able to choose which of these catalogs he wants by selecting one or more checkboxes. Next to each checkbox there should be a thumbnail image of the appropriate catalog. The person who will fill the website with content later in the cms should be able to upload or change these images. There will be a limited number of catalogs (two exists already - a few will follow soon), so for now I need only five checkboxes which should only appear if an appropriate image is uploaded. I tried to implement it like this:

in the php-file:

static $db = array(
      'Mailto' => 'Varchar(100)',
      'SubmitText' => 'Text',
      'Shop' => 'HTMLText',
      'Book1Txt' => 'Text',
      'Book2Txt' => 'Text',
      'Book3Txt' => 'Text',
      'Book4Txt' => 'Text',
      'Book5Txt' => 'Text'


function ContactForm() {
      $book1 = $this->Book1();
      $book2 = $this->Book2();
      $book3 = $this->Book3();
      $book4 = $this->Book4();
      $book5 = $this->Book5();
      if (!empty($book1)) {$book1 = $this->Book1()->CroppedImage(200,200)->getURL();}
      if (!empty($book2)) {$book2 = $this->Book2()->CroppedImage(200,200)->getURL();}
      if (!empty($book3)) {$book3 = $this->Book3()->CroppedImage(200,200)->getURL();}
      if (!empty($book4)) {$book4 = $this->Book4()->CroppedImage(200,200)->getURL();}
      if (!empty($book5)) {$book5 = $this->Book5()->CroppedImage(200,200)->getURL();}

      $fields = new FieldSet(
       new CheckboxSetField(
         $name = "Books",
         $title = "Bitte wählen Sie mindestens ein Buch aus",
         $source = array(
         "1" => "<img src='$book1' />",
         "2" => "<img src='$book2' />",
         "3" => "<img src='$book3' />",
         "4" => "<img src='$book4' />",
         "5" => "<img src='$book5' />"
         $value = "1"
       new TextField('Name', 'Name*'),
       new TextField('Firstname', 'Vorname*'),
       new TextField('Adress', 'Adresse*'),
       new EmailField('Mail', 'Email*'),
       new TextareaField('Comments','Kommentar*')
      // Create action
      $actions = new FieldSet(
       new FormAction('SendContactForm', 'Send')
      // Create Validators
      $validator = new RequiredFields('Name', 'Firstname', 'Adress', 'Mail');
      return new Form($this, 'ContactForm', $fields, $actions, $validator);

and in my Template:

<div id="Content" class="typography">
<% if Success %>
<% else %>
<% end_if %>

But this doesn't seem to work..I always get this error:

"Fatal error: Call to a member function getURL() on a non-object in (...)"

However, I am not good enough in PHP and SilverStripe and do not know how to solve this..can anyone help me, please?


29 August 2013 at 12:06am Community Member, 215 Posts


$source = array();
if( $this->Book1() && $this->Book1()->is_a('Image') ) {
$image = $this->Book1()->CroppedImage(200,200);
if( $image && $image->is_a('Image') ) { $source[1] = $image->getURL(); }
// ...

new CheckboxSetField(
$name = "Books",
$title = "Bitte w&auml;hlen Sie mindestens ein Buch aus",
$value = "1"


29 August 2013 at 1:01am Community Member, 17 Posts

Hi Devlin,

thank you for answering! I've tried your there is no error message anymore but I get only the path of the images ( e.g. assets/Uploads/_resampled/croppedimage200200-resizedimage340340-buch2.jpg) next to my checkboxes, not the image itself. Any ideas how to fix that?

Thank you!


29 August 2013 at 1:07am Community Member, 215 Posts

Oh yeah, sorry.


if( $image && $image->is_a('Image') ) { $source[1] = $image->getURL(); }


if( $image && $image->is_a('Image') ) { $source[1] = $image->getTag(); }


29 August 2013 at 1:21am Community Member, 17 Posts

Awesome! Thank you very much!


19 October 2013 at 5:47am (Last edited: 19 October 2013 5:47am), Community Member, 17 Posts

Hello again!

Now I have a further question referring to the same issue. I tried to add some text to the pictures? Something like a heading or a caption for the product. But I just don't get can I integrate this into the array? Or: what is the best solution for this?

Thank you, any help would be great!