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  • Mikael Axel Kleinwort 137 posts 479 karma points c-trib
    Nov 19, 2021 @ 12:29
    Mikael Axel Kleinwort

    Modify data values of certain data types before they are rendered on frontend

    I am looking for a way to change the data of certain data types before it is rendered on a page.


    • for selected properties (data types), content editors can use certain placeholder keys in text.
    • if a page renders such a property, the placeholder keys need to be replaced with real-time data. The replacement is only performed for rendering on frontend.

    Right now I am modifying the values of the affected properties in the view files, and it works, but it requires a lot of manually written code and I am looking for an automatic way.

    What I am struggling with is to get my hands on the data before it hits the controller. I need some sort of event that is called for each doc type property regardless of its datatype, so I can check the property's data type and perform the replacement if needed.

    How can I approach this? Any input is greatly welcome :-)

  • Marc Goodson 1890 posts 12532 karma points MVP 7x c-trib
    Nov 21, 2021 @ 20:29
    Marc Goodson

    Hi Mikael

    There is an event that is fired just after the 'PublishedContent' for a particular page is assembled.... and just before it is sent to the controller for processing and rendering...

    It's called the PublishedRequest.Prepared event!

    And that gives you access to all the content that is about to be prepared and you can manipulate it here to make last minute adjustments... would that give you what you need to be able to make your placeholder replacements in one place?

    To hook into this in V8 you'd create a composer + component

    using System;
    using Umbraco.Core;
    using Umbraco.Core.Composing;
    using Umbraco.Web.Routing;
    namespace Umbraco8.Components
        [RuntimeLevel(MinLevel = RuntimeLevel.Run)]
        public class SubscribeToPublishedRequestComposer : ComponentComposer<PublishedRequestComponent>
        { }
      public class PublishedRequestComponent : IComponent
            public void Initialize()
                PublishedRequest.Prepared += PublishedRequest_Prepared;
            private void PublishedRequest_Prepared(object sender, EventArgs e)
                 var request = sender as PublishedRequest;
                 // do something…
            public void Terminate() {
                //unsubscribe during shutdown
                PublishedRequest.Prepared -= PublishedRequest_Prepared;

    anyway might be worth experimenting with.



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