I need to add the onload event in jquery script tag as advagg does. I have done a bit of research, and I found that they are actually invoking hook_element_info_alter() and thereby add their hook_advagg_modify_js_pre_render() implementation into it. Then, they alter the child elements.

When I do the same in a hook_element_info_alter() implementation, type['script'] is not there.

Am I missing something?

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  • What is the reason you can't use drupal behviours for the onload events? sqndr.github.io/d8-theming-guide/javascript/behaviors.html – Rick B Mar 24 at 15:10
  • I want add the onload event only to jquery library and the drupal js asbecause if I add the defer attribute to them or move them to footer the whole page got collapsed – Mainak Ray Mar 25 at 5:51
  • Assuming you're using Drupal 8, And your page is collapsing, so I think it is about a theme. you should then declare your script in libraries as head. I'll try to explain it in the answser – Rick B Mar 25 at 8:57
  • Sorry I am using drupal 7 . Is there any way I can do it? – Mainak Ray Mar 25 at 12:38

If you want to make sure you're javascript is loaded in the header:

For drupal 7


function theme_preprocess_html(&$var) {
      $path = $GLOBALS['base_url'] . '/' . path_to_theme() . '/js/yourscript-min.js';
      $script = array(
        '#tag' => 'script',
        '#attributes' => array(
            'type' => 'text/javascript',
            'src' => $path
        '#value' => '',
       drupal_add_html_head($script, 'script');  

or if you want it loaded in the page:

function theme_preprocess_html(&$var) {
      $script = array(
        '#tag' => 'script',
        '#attributes' => array('type' => 'text/javascript'),
        '#value' => 'Add your javascript here',
       drupal_add_html_head($script, 'script');  

For drupal 8

In the yourtheme.libraries.yml you need to create a library like so:


  header: true
    js/yourSrctipForTheHeader.js: {}

Also in the theme.info.yml you need to add this library, then it will automatically comes in head tag and will be available before the page load, if you remove header:true the script will be loaded after the page load.


  - yourtheme/library-name

Alternativly, you can make use of this module: https://www.drupal.org/project/header_and_footer_scripts and put the scipts in manually in the position that you want. But to be honest, i think the first solution is the more elegant way.

  • Thanks fro your suggestion . I am using drupal 7 – Mainak Ray Mar 25 at 12:39
  • I've updated the answer for drupal 7 – Rick B Mar 25 at 14:09
  • Sorry I did not asked , that , My Question is how to override hook_advagg_modify_js_pre_render like advagg does and how they implemented advagg_get_js – Mainak Ray Mar 26 at 13:33

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