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enter image description here

I have created content type with field as List(text). If I select any of above option and try to save it, it through "fieldName: illegal value" error.But if I modified option in below format and then try to save it. It get saved successfully.

-option1

-option2

-option3

-option4

Does list doesnot support first format? Is there any other way to resolve this without changing its format ?

  • Hi thanks for response. Yups its option group. Also attached image related to it. – Sudha Bisht Sep 14 '16 at 9:36
  • here the problem is you havent provided the key properly . So its not able to store the value or get the value – Shreya Shetty Sep 14 '16 at 9:38
  • Hi Shreya, so how should I provide key without changing format specified in image. Can you please help by giving any example. – Sudha Bisht Sep 14 '16 at 10:09
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You can achieve that by using hook_form_alter function.

I've tested the following code on my instance. It's working fine.

Use the following code in your custom module.

function YOUR_MODULE_form_alter(&$form, &$form_state, $form_id) {     
        if ($form['#form_id'] == 'YOUR-CONTENT-TYPE_node_form') {
         $form['YOUR-FILED-NAME']['und']['#options'] = array (
       'Group1' => array(
          1 => 'Option1',
          2 => 'Option2',

        ),
        'Group2' => array(
          3 => 'Option3',
          4 => 'Option4',
        ),
    );
    return $form;
        }
    } 

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