Re: [web-devel] [Yesod] Bookmarklet web app development.

When writing a Julius template, you can embed type-safe URL values inside using @{...} interpolation. At the end of the day, however, Julius needs to be able to send a String version of that URL to the user. Julius itself knows nothing of how to convert your RootR (or whatever) value into a String, so it needs some help. Therefore, the type sig of a Julius template is: type Julius url = Render url -> Javascript type Render url = url -> QueryString -> String type QueryString = [(String, String)] The idea is that the render function will be able to take any route and a list of query string parameters and create a string version of your route. A simple example might be: data MyRoute = RootR | PersonR String myRender RootR [] = "http://www.example.com/" myRender (PersonR "michael") [("age", "26")] = "http://www.example.com/person/michael?age=26" And so on and so forth. Once you have this function, you can automatically convert a Julius to a Javascript value, eg: [$julius|alert("Go to @{PersonR "michael"}")|] myRender :: Javascript You can then use renderJavascript to convert a Javascript value into a bytestring. As a convenience, we also have renderJulius, which simply does: renderJulius :: Render url -> Julius url -> ByteString renderJulius r j = renderJavascript $ r j Hope that helps, Michael On Sun, Feb 20, 2011 at 10:25 PM, Ian Duncan wrote:

renderJulius is indeed what you want. renderJulius takes a route rendering function for the first argument and then a quasiquoted Julius expression. Unfortunately there's not an explanation exactly how renderJulius's first argument works, but it's definitely related to how it renders routes. Perhaps Michael can give us an intuition on that. #{} interpolated stuff works without any special effort. Once it's clear how to use the first argument, you should be able to just write out the data either to a temporary file and give that to your user or just embed the rendered javascript in a link on a page and have the user drag it to their toolbar. -- Ian Duncan

On Sunday, February 20, 2011 at 6:08 AM, William Pearson wrote:

On 20 February 2011 05:22, Ian Duncan wrote:

William, It sounds like you should be able to do what you want to do. You can render type-safe urls with Julius using @{type-safe-url} escapes and other stuff using #{whatever} escapes. No need to sacrifice there. Is that what you were asking? I'm not quite clear on what your dilemma is.

The problem is creating a function of type a -> Handler (Content, ContentType) where Content is not a static javascript file, but created from a Julius or Cassius template.

addJulius is not what I want because it returns a GWidget which I need to add to a defaultLayout or something. Which even if I had a blank default layout as a subsite would put it in script tags, I think.

renderJulius looks like what I want but I haven't found examples of it's use.

Does that make things clearer?

Will

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