How to add a css class programmatically to a piece of code?

Tags: php,css,class,drupal

Problem :

I have this code that just paste the drupal(7) search form whatever I need to.

<?php print drupal_render(drupal_get_form('search_block_form')); ?> 

The thing is that there´s no way for me to target that particular input[type="text"] without modifying other text inputs within the page.

I´ve tried to wrap the code into a class DIV, let´s say special-search-form, so I could just do

.special-search-form input[type="text"] {}

But that won´t do. Is there a way to add a class inside that drupal_render() call?

Solution :

There are two ways to handle this.

A) Through a module

function hook_form_alter(&$form, &$form_state, $form_id) {
  switch ($form_id) {
    case 'search_block_form':
      $form['#attributes']['class'][] = 'extra_class';

I think this might also work too, though I'd need to clarify that ...

function hook_search_block_form_alter(...) {
  $form['#attributes']['class'][] = 'extra_class';

B) Through a theme [search-block-form.tpl.php]

<div class="extra_class">
  <?php echo $search_form; ?>

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