Ajax calls in wordpress

your ajax url is wrong i think. ajax link should be admin_url( ‘admin-ajax.php’ ). That means

wp_localize_script('history_script', 'myAjax', array('ajaxurl' => get_template_directory_uri().'/functions.php'));

will be this 

wp_localize_script('history_script', 'myAjax', array('ajaxurl' => admin_url( 'admin-ajax.php' ));

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