I want to hide certain elements in form using form_alter or a template file. I have read somewhere that in Drupal 7 , we can specify $form elements so it will not display in form, but I can't remember! Not unset() but some other function!
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3 Answers
Using unset() isn't a good solution for forms (as I think you know), as you never know what submit/validate handlers might be expecting the unset element to exist when they're processed. This can lead to unwanted errors.
There are three methods you can safely use to 'hide' a form element
- Use
'#type' => 'value'on the element, which will have the effect that the value for the element will still be passed through to the submit/validate functions with its#valueas normal. This is my preferred method. - Use
'#access' => FALSEon the element to denote it should not be outputted to the screen. - Use
'#type' => 'hidden'as Bart has suggested (although use of this depends on your use case; I imagine if you're trying to hide the value of a form element you don't want to output it in the form as a hidden input).
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2@zhilevan
hide()shouldn't be used on form elements, it can easily mess the whole form submission process up as validators are still run for the element. For example, if youhide($form['title']);on a node form you won't ever be able to submit the form, as the title field is required, but a value won't be provided. The 3 methods above are the best ones to use, in that order :)– Clive ♦Commented Sep 5, 2012 at 11:48 -
@Clive thanks, i know above methods, my question was something related to hide() i think(still cant remember the function).. anyway please refer my comment in 1st answer, why
drupal_render($form['base']['prices']['sell_price'])is not working?– SerjasCommented Sep 5, 2012 at 11:54 -
Is that code in a template file that's theming the form? If not, the reason it's not working is that while you can print out any render element to the screen with
drupal_render(), you won't get any of the form tags/tokens/etc. unless you output the whole$formarray– Clive ♦Commented Sep 5, 2012 at 11:57 -
i used hook theme and print_r($form) and even drupal_render($form['title']) are working , the problem is the elements under vertcal tabs!– SerjasCommented Sep 5, 2012 at 12:05
If you're using a template file you can hide stuff using hide().
If you want to hide a form element in hook_form_alter, unset() might be your best option.
If it's just to store a value you could use '#type' => 'hidden' as well.
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What I was trying to achieve was a custom Ubsercart product node form, all I wanted to display is sell_price, and hide other elements like shipping, weight etc. But
drupal_render($form['base']['prices']['sell_price'])will display form , but its not saving!– SerjasCommented Sep 5, 2012 at 11:35
I've found using #access to false can break some forms if used on submit buttons or similar. In those cases i've just used CSS to hide elements:
$form['basic']['submit']['#attributes']['class'][] = 'element-hidden';
Just another option.
