Where can I find the OnAfterRender function referenced in WebSharper code?

Question

I've just started using WebSharper, and I'm trying to do something with the Google Maps API. I have been trying to implement the sample code from below: https://github.com/intellifactory/WebSharper.Google.Maps

open IntelliFactory.WebSharper.Google

[<JavaScript>]
let Sample buildMap =
    Div [Attr.Style "padding-bottom:20px; width:500px; height:300px;"]
    |>! OnAfterRender (fun mapElement ->
        let center = new Maps.LatLng(37.4419, -122.1419)
        let options = new Maps.MapOptions(center, MapTypeId.ROADMAP, 8)
        let map = new Maps.Map(mapElement.Dom, options)
        buildMap map)

But I can't find where the OnAfterRender method lives. I believe I've opened all the required namespaces, but there is no mention of it.

A cheap second question, is there a best database to use with WebSharper apps, or does it make no difference? Appharbor gives me the choice of: RavenDB, Microsoft SQL Server, MySQL, ElephantSQL, JustOneBD and MongoDB. I've got very little db experience, and I only need a very simple flatfile db.

Answer 1

OnAfterRender is defined in IntelliFactory.WebSharper.Html.Operators (as can be seen from here). It is sufficient to open IntelliFactory.WebSharper.Html (as Operators is marked with [<AutoOpen>]).

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Regarding the database, there is nothing too important here. What you should make sure you have, before you make the decision, is:

1. A .Net interface (usually exists, especially if AppHarbor offers that database)

2. A good ORM that generates F#-usable classes. The definition of "F#-usable" is of course subjective, but make sure that the classes fits your coding style, otherwise you'll have to write your own ORM or your own wrappers around the ORM classes.