I'm trying to add a custom button in the sidebar of one of my entries.

I've found that it could be done in Craft 3 with this template hook: cp.entries.edit.details (e.g. How to add a custom button at the right section of an entry?)

In the Craft 4 upgrade documentation, it mentions that this hook has been removed. I found these two events - EVENT_DEFINE_EDITOR_CONTENT and EVENT_DEFINE_ADDITIONAL_BUTTONS - but so far, I haven't been able to return html to my template.

Is there an easy way to do it in Craft 4?

1 Answer 1


You'll want to use the EVENT_DEFINE_SIDEBAR_HTML event like so:

use craft\elements\Entry;
use craft\events\DefineHtmlEvent;
use craft\helpers\UrlHelper;
use yii\base\Event;

    function(DefineHtmlEvent $event) {

        /** @var Entry $entry */
        $entry = $event->sender;

        // Make sure this is the correct section
        if ($entry->sectionId == 5)
            // Return the button HTML
            $url = UrlHelper::url('some/path/' . $entry->id);
            $event->html .= '<a href="' . $url . '" class="btn">My Button!</a>';


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