Block js loading

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Hi,

I want to add custom js on page view.
i have a js file in the js folder and i want to initiate a js var to be used in this file.

public function on_page_view(){
        $html = Loader::helper('html');
        $this->addHeaderItem($html->script('var SOME = "'
                             .Loader::helper('concrete/urls')->getToolsURL('mytools', 'mypack')
                             .'";'
                ));
    }


the problem is that this script is loaded after js file.

Thanks.