How to set default value for textfield programmatically in drupal 7?

Question

I need a form_alter code or something that I could use to set my field value. I'm getting the value from the parameter and I've tried a lot of ways but nothing works for me. This is the list of codes I've tried on my custom module:

function custommodule_node_form_alter(&$form, &$form_state, $form_id) {
  if ($form['#node']->type == 'custom_package') {
      $default = $_GET['field_product_add_ons'];
      $form["field_add_on_nids"][LANGUAGE_NONE][0]['value']['#default_value'] = $default;
      $form['field_add_on_nids'][LANGUAGE_NONE][0]['value']['#default_value'] = $default;
      $form['field_add_on_nids'][LANGUAGE_NONE][0]['#default_value'] = $default;
      $form['field_add_on_nids'][LANGUAGE_NONE]['#default_value'] = $default;

  }


  if($form_id == 'custom_package') {
      $default = $_GET['field_product_add_ons'];
      $form["field_add_on_nids"][LANGUAGE_NONE][0]['value']['#default_value'] = $default;
      $form['field_add_on_nids'][LANGUAGE_NONE][0]['value']['#default_value'] = $default;
      $form['field_add_on_nids'][LANGUAGE_NONE][0]['#default_value'] = $default;
      $form['field_add_on_nids'][LANGUAGE_NONE]['#default_value'] = $default;

  }
}

I think the code will be simple but the field is still blank. My field is just a single text field.

Thank you in advance for your help!

Answer 1

Is your custom module called custommodule_node or just custommodule? Assuming it's custommodule, your function should look like below. You use -> because node is an object.

function custommodule_form_alter(&$form, &$form_state, $form_id) {
  if($form_id == 'custom_package') {
      $default = $_GET['field_product_add_ons'];
      $form->field_add_on_nids[LANGUAGE_NONE][0]['value'] = $default;
  }
}

also, there is no if ($form['#node']->type == 'custom_package')

Use if ($form_id == 'custom_package') to match $form_id.

Answer 2

Try

 $form['field_add_on_nids']['und']['#default_value'] = $default;

Thanks

Answer 3

You can try either of these way any one will work

Option 1:

$form['field_name']['und']['#default_value'][0] = $default_value;

Option 2:

$form['field_name']['und']['#default_value'] = $default_value;

option 3 :

$form['field_name']['und'][0]['value']['#default_value']= $default_value;

Answer 4

I would try the following, as it works for me:

$form['field_myfield'][LANGUAGE_NONE]['#default_value'] = "value";

I believe that using LANGUAGE_NONE is considered a better practice than 'und'.