Topic Template Placeholder Text theme component

Theme component
3

You can try something like this

<script type="text/discourse-plugin" version="0.8">
  api.modifyClass("model:composer", {
    applyTopicTemplate() {
      this._super(...arguments);

      Ember.run.schedule("afterRender", () => {
        // do your work here
      });
    }
  });
</script>

This should allow you to add some custom logic when Discourse applies category topic templates.

That said, this type of way of writing stuff is a bit outdated. I would also recommend that you give this a read if you plan to spend a lot time on Discourse themes. It makes life much easier.

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