Insert code right after body tag using theme functions_问答_开发者

I am trying to add a piece of code at the begining of every page in a Drupal site. Since I have more than one page template, I want to do this programatically... but am not succeeding.

I am still new and, though I get the gist of hooks, theme functio开发者_运维问答ns, and the such, I just can't figure the correct way to achieve this.

So far I've overriden the theme_preprocess_page(&$vars) to add the necessary css and js:

function mytheme_preprocess_page(&$vars) {
    if(condition) {
        drupal_add_js(drupal_get_path('module', 'mymodule').'/js/modal.js');
    }
}

How can I now add html code in every drupal page, preferably just after the opening bodytag or in any other starting section, via a function in the template.phpfile?

Thank you

In your preprocess function, any variable set, will be available in your page.tpl.php file.

function mytheme_preprocess_page(&$vars) {
  if (condition) {
    $vars['foo'] = '<div id="bar">TEST</div>';
  }
}

then, in your page templates:

<body>
  <?php print !empty($foo) ? $foo : ''; ?>
...

Had a look at https://www.drupal.org/project/google_tag. This is how they did it:

/**
 * Implements hook_page_alter().
 *
 * Adds a post_render callback
 */
function MYMODULE_page_alter(&$page) {
  $page['#post_render'][] = 'MYMODULE_CALLBACK';
}

/**
 * Implements callback_post_render().
 *
 * Inserts JavaScript snippet immediately following the opening body tag.
 */
function MYMODULE_CALLBACK(&$children, $elements) {
  $script = '<script type="text/javascript">console.log(\'hello world\');</script>';
  // Insert snippet after the opening body tag.
  $children = preg_replace('@<body[^>]*>@', '$0' . $script, $children, 1);
  return $children;
}

This should keep you from having to modify any code in your templates:

function MY_MODULE_page_build(&$page)
{
    $page['page_bottom']['my-markup'] = array('#markup' => '<div>My Markup Here</div>');
}

My approach finally was overriding the first rendered block in the page, in my case the Language Switcher. Since I already was overriding it to customize it, it wasn't too much of a big deal, but it is anyway an ugly way to achieve that.

<?php
function mytheme_languageswitcher($links) {
    // inserting this here like a virus in a dna strip
    if(condition) {
        drupal_add_js(drupal_get_path('module', 'mymodule').'/js/modal.js');
    }
    // the *real* code for the language switcher override
}
?>

Since the Language Switcher is rendered in every page, it works. The day the language switcher stops being displayed for whatever reason, this solution will FAIL.

You can add it to the footer with an option passed into the drupal_add_js function.

function THEMENAME_preprocess_page(&$variables) {
   if (condition) {
      drupal_add_js(drupal_get_path('theme', 'THEMENAME') . '/PATH/TO/FILE.js', array('scope' => 'footer'));
   }
}

This will end up printing just before the closing body tag via the $page_bottom variable in the template html.tpl.php.

Another way to do it is to use the native drupal methods drupal_add_js and drupal_get_js.

// first, add your JS with a custom "scope" (before process phase)

<?php
drupal_add_js($tag_js, array(
  'type' => 'inline',
  'group' => JS_GROUP_TAGS,
  'every_page' => TRUE,
  'scope' => 'body_start',
  'weight' => 1,
)); 
?>

// ugly way : add the drupal_get_js directly into html.tpl.php (but for testing, it's useful):

<body>
<?php print drupal_get_js('body_start'); ?>
...
</body>

// A cleaner way : use an intermediate variable, in a process method // Exactly like template_process_html, in theme.inc

<?php
function MYMODULEORTHEME_process_html(&$variables){
  $variables['js_body_start'] .= drupal_get_js('body_start');
}
?>

Enjoy :)

Insert code right after body tag using theme functions

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