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1. drumatic
   Member
   Posted 1 year ago #

   I guess it would be useful when people can add error messages when a plugin installation failed or to give further instructions to the user.

   I offer to implement this according to wp design standards if i get the opportunity.

   thanks and greets

   drumatic

2. drumatic
   Member
   Posted 1 year ago #

   i did a little hack to output messages:

   add this to your plugin_activation function:

   add_option( 'myplugin_msg', 'Error: Something went wrong');

   function myplugin_message() {
   	if ( $msg = get_option('myplugin_msg') && $_REQUEST['activate'] == 'true' ) {
   
   		echo '
   		<script type="text/javascript">
   			var el = document.getElementById(\'message\');
   			el.innerHTML = el.innerHTML + \'<p>'. $msg . '</p>\';
   		</script>';		
   
   		delete_option('myplugin_msg');
   	}
   }
   
   add_action( 'wp_print_footer_scripts', 'myplugin_message' );

3. Ipstenu
   Half-Elf Support Rogue & Mod
   Posted 1 year ago #

   WordPress already has error messages when you try to activate a plugin that can't be activated. And many plugins already hook into things to tell you why and what to do (WP Super Cache comes to mind).

4. drumatic
   Member
   Posted 1 year ago #

   yes it get's activated most of the times, even when it can't create a table or something, but i can't tell the user why it happened..

   i will take a look at that plugin thanks.

   but it would be nicer if you could return a WP_Error or string that get's displayed, without nasty hacks..

5. Mike Toppa
   Member
   Posted 11 months ago #

   This is a late reply, but may be useful for anyone else struggling with this. This is my solution:

   
function wpSimpleTestActivate() {
if (version_compare(get_bloginfo('version'), '3.0', '<')) {
trigger_error('You must have at least WordPress 3.0 to use SimpleTest for WordPress', E_USER_ERROR);
}
}


   Activation runs in a separate process, so triggering a PHP error will not affect anything else. The error message is shown in the activation status message. It's shown as a PHP fatal error, so it's not an elegant solution, but I have not found any other way to return an activation status message.

   Also, I'm not sure what Ipstenu is referring too. I took a quick look at WP Super Cache - it's activation function has absolutely nothing in it.

6. Newman
   Member
   Posted 11 months ago #

   Due to how WordPress activates plugins, you can effectively control what is put into the message box by first triggering an E_USER_ERROR and then displaying a more friendly error message.

   I have a short post about it here: Custom WordPress Plugin Activation Error Messages

   It allows you to display whatever text you want in the message box without running any javascript or other complex code.

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