This post to introduce the Razor-like support, part of the Delphi Relax project. This part of the project is available online (source and documentation). It is released under MPL license. First of all, the project web site is at .

To get the actual source code refer to the SVN information at There is the source code of a component plus the Delphi XE package to install it. There is also a half-baked demo using WebBroker (remember, the goal is to use it as a plug-in to the DataSnap REST Application Architecture, which uses WebBroker underneath). The demo is the one covered in the documentation.

The documentation is a PDF of 28 pages, which took me quite some effort to prepare. It covers the relax syntax and the use of the two components. In this blog post there is only a short summary of the two parts, you'll find much more in the docs of course.

Razor Delphi Syntax


The adaptation of Razor used in Delphi Relax has a rather simple syntax. First, it uses the @ symbol as marker, rather than tags or other notations. The symbol is followed by a special processing keyword or by a value, generally indicated with a dot notation as object.value, so you'll see tags like: @object.value.


The object name might come from a specific registration in a dictionary, and the value is the nasme of a property (for a generic object) or a field name (if the object is a TDataset). As an alternative, the value can be provided by the OnValue event handler.

There are several special tags:


  • @if object.value { ... }: executes the following block among braces only if value is "true"
  • @ForEach object { ... }: executes the following block among braces as many times as there are elements in the enumerator. Currently supports datasets and TList.
  • @loop is used within a loop to access to the current object / record
  • @LayoutPage: indicate the HTML page to use for the structure, a sort of HTML template
  • @RenderBody: where to place the actual content of the page within the layout page or template
  • @LoginRequired will stop processing and return an error in case the user is not logged
  • @Lang is part of the language / translation support


The Delphi Razor Components

The Razor package (or the razor portion of the overall Delphi Relax package) installs two different components, a single file processor and an engine which can instantiate individual processors and provides global configuration for either the dynamic processors or those manually connected with it.

RlxRazorProcessor: This is the core component, capable of taking an HTML file embedding the razor notation and converting it to plain HTML after processing the @ tags.


RlxRazorEngine: This is the engine component, which can be used in two different scenarios: (i) You can connect it to one ore more RazorProcessor components, to provide shared settings and behavior, rather than customizing each specific processor. (ii) You can let is create RazorProcessors when needed, and place only this component on your web modules.

In Development

This is only one part of an overall project, but feel free to start playing with it. It is still an early beta, many features are likely to change. Help is welcome. Not only suggestions, but actual coding help. For example, a person willing to write unit testing for the project (following the doc) would add a lot of value! Contact me for this or if you are interested and want a consultant to help you use this architecture fro your code (this is where I hope I'll have some benefit...)

Again, this is only a small part of a larger project. And stay tuned, hope to have an introductory video for the demo that's available in a day or two. Also willing to schedule an open chat (on unless there are better suggestions) if there is interest in discussing the project a little more. For now, feel free to comment on this blog post. 

PS: Please no "Dephi is for client only, you are wasting your time", thanks. Got already quite a few of those.