How do I show a checkboxes form element that is selected by default?

I tried setting #default_value as in the following code, but it doesn't work.

$form['ios'] = array(
  '#type' => 'checkboxes',
  '#options' => $options,
  '#default_value' => 'checked',

Is #default_value the wrong attribute?

  • Have you tried this? $form['ios'] = array('#type' => 'checkboxes', '#options' => $options, '#default_value' => array($value)); $value should be the option you want selected by default. Sep 13 '12 at 12:02
  • If you have a single field, you can use the following code. $form['name']['terms_condition'] = array( '#type' =>'checkbox', '#title'=>t('Terms and conditions'), '#required'=>TRUE, '#default_value' =>TRUE);
    – shashik493
    Dec 4 '14 at 6:11
  • What happens here when the form is submitted with the checkbox unchecked but required set to true?
    – span
    Nov 18 '17 at 17:27

#default_value for checkboxes form elements should be set as in the following code.

$options = array();
$options["1"] = "One";
$options["2"] = "Two";
$options["3"] = "Three";
$options["4"] = "Four";

$form['ios'] = array(
  '#type' => 'checkboxes',
  '#options' => $options,
  '#default_value' => array("1", "2", "3")

You have to give "#default_value" all $options keys

In your case:

$form['ios']['#default_value'] =  array_keys($form['ios']['#options']); 
  • It depends on what selected means for the OP, but to me it means at least one checkbox is selected. Since the OP already accepted an answer, I take he didn't mean that all the checkboxes needed to be selected.
    – apaderno
    Jun 24 at 18:54

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