Hi

i want to add 2 hooks onAfterPublish and onAfterUnpublish to my modules. basically i want to update my xml file based on page published and unpublished.

my config file include following code

Director::addRules(10, array(
	SiteMapModule::$siteMapURLSegment => 'SiteMapModule',
));

and

class SiteMapModule extends Page_Controller { 

		public function onAfterPublish() {
			$this->Content();
			parent::onAfterPublish();
		}
		
		public function onAfterUnpublish() {
			$this->Content();
			parent::onAfterUnpublish();
		}
		
		public function  Content() {
			#code
			#code
		}

}

but this is not working? can anybody help me how to do this?

I think you may have your extension setup incorrectly. I think you would want to set it up like so

class PageExtension extends DataExtension {
    //your code
}

and in _config.php

Object::add_extension('Page','PageExtension');

If that doesn't work check out the doPublish() and doUnpublish() functions in SiteTree.php.

thanks for reply. but it dosen't work for me

my problem is i have sitemap module installed which generate sitemap.xml file along with sitemap page.

now i want to update sitemap.xml file on content publish,un-pubhlish,delete, etc. i have made changes to sitemap module so it can generate sitemap.xml file.

i have following in my config file.

Director::addRules(10, array(
	SiteMapModule::$siteMapURLSegment => 'SiteMapModule',
));

and in sitemap module file following code

class SiteMapModule extends Page_Controller {
 #code
}

i want to extend class DataExtension so that i can use hooks.
will you please suggest me appropriate way to achieve this.

Hey Kammo

You don't want to extend Page_Controller. I did some more investigating and did find out that I was mistaken about which class to extend. You actually want to extend the SiteTree class, not Page (Although Page may have worked)

your extension should be like

class SiteMapModuleExtension extends DataExtension {
public function onAfterPublish() { 
         //your code
      } 
       
      public function onAfterUnpublish() { 
         //your code
      } 
}

and in your _config.php

Object::add_extension('SiteTree','SiteMapModuleExtension');

Check out this module on github, silverstripe-googlesitemaps. It may help point you in the right direction.

HI again thanks for reply. but it's not working. i am attaching code if you can help me.
i got following error when i apply changes suggested by you.

Fatal error: Object::add_extension() - Can't find extension class for "SiteMapModuleExtension" and also googlesitemap not working with my version giving some error related to composer.js

To fix the "Fatal error: Object::add_extension()..." you'll have to do a ?flush=all.

Not sure why your getting an error related to composer.js but as you don't need to install the module I wouldn't bother installing it. Just examine the code on git or through your local code editor as it may assist you.