How to make checkbox checked in Yii2?

Question

Yii

Hello

<?=$edit_form->field($model, 'serv1')->checkbox([ 'value' => '1'])->label('');?>

How to make it checked ? as we suppose

<input type="checkbox" name="serv1" value="1" checked>

Tried to use checked properties etc.
But it doesn't work.
It only exits checked if value is false

Answer 1

The guys figured out the need for the 'checked ' attribute with an extra space
<?=$edit_form->field($model, 'serv1')->checkbox([ 'value' => '1', 'checked ' => true])-> label('');?>

Answer 2

If the checkbox is NOT needed by default:

...
<?php
$page->text = 'я принимаю пользовательское соглашение';
?>
...
<?=$form->field($model, 'serv1')->checkbox(['uncheck' => $page->text, 'value' => $page->text, 'label' => '$page->text]); ?>

if the flag is REQUIRED :
--
Or, as Maxim Fedorov said , we take it and declare it in an action in the controller.