Url params

[maikklein]

Hello,

I am trying to do something like this:

www.test.com/guides/xxxxx

I want to render a different page based on the name "xxxxx"

www.test.com/guides/awesomeguide

www.test.com/guides/newguide

My approach would be I would have a sitemap like this

Menu.i("guides") / "guides"


-----------------------------------------


guides.html


<div lift:Guides.userGuides> </div>


------------------------------------------------
class Guides{
def userGuides = {
// render different page
}


}

So I would have one snippet which renders me a new page based on the input. I already managed to get the input like this

def howdy() = {


    val s = Req.parsePath(S.uri).partPath


    println("+++++++ ")


    s.foreach(s => println(s))


   "#time *" #> date.map(_.toString)
  }

I get the url in a list. If the url is /guides/test I would get List("guides","test")

Then I could query my database with the name and render the html page. 

But I ran into a small problem. Because lift thinks /guides/test is a html file I always get the error "The Requested URL /index/test was not found on this server" . Which is what I was expecting.

I need a way to tell lift "Hey if you see /guides/ the following thing would be a variable so don't try to look for a html file".

In Play2 (MVC) it looked something like this

/guides/:guideName                   controllers.Guides.userGuides(guideName: String)

I am not sure how you call this in lift. I think the solution could be on http://simply.liftweb.net/index-3.4.html#prev 3.4.5 Param Example 

But this is really strange and I couldn't get it to work and I am not quite sure if this is what I want. So for simplicity I just parsed the url into a list.

@http://simply.liftweb.net/index-3.4.html#prev 3.4.5 Param Example 

My best guess would be that it generates somehow a sitemap in "Params" But I don't see the connection between Class ShowParam and object Param. And Param never gets called.

What would you recommend me to look into?

[AGYNAMIX Torsten Uhlmann]

Maik,

actually the param example, using a LocParam, is the recommended way to do that.

You would make the name of the guide a parameter to the Guides snippet by plumbing in the LocParam to that guides menu location. Lift will then pass the guide name into your Guides snippet where you work on it.

Another (more common, not recommended) way to do it is using "LiftRules.statefulRewrite.append" to append a rule

that basically says: "when encountering /guides/xxx" go to page guides.html and pass in "xxx" as a parameter. That also works, but leaves more of the plumbing to you.

Take a few looks on the param example, then come back and look again. It's not necessarily easy to understand because it's different from what you might be used to, and yet it works and works great.

Hope that helps,

Torsten.

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[Ben Phelan]

Quick and dirty example with 2 params:

1. Create a param menu

  def someParamChecks(params: CaseClassForParams): Boolean = {

     // do some early param checks

     true

  }

  val someParamMenu = Menu.params[CaseClassForParams](

    "MyPage",

    S ? "MyPage",

    params => 

      if (!someParamChecks(params)) Empty

      else Full(CaseClassForParams(params(0), params(1))),

    params => params.toList

  )

2. Insert into your sitemap

  Menu(someParamMenu              / * / "stuff" / * >> User.loginFirst)


3. Do this in your snippet

  case class CaseClassForParams(firstParam: String, secondParam: String) {

    def toList = firstParam :: secondParam :: Nil

  }

  class SomeSnippet (params: CaseClassForParams) extends DispatchSnippet {

    def dispatch = {

      case "render" => render

    }

  

    def render (in: NodeSeq): NodeSeq = {

      // use the params var here

    }

  }

4. Put your template at src/main/webapp/star/stuff/star.html

[Ben Phelan]

Actually someParamChecks should take a List[String] ... 

[maikklein]

Thanks, okay I will experiment a little bit. :)

[Peter Petersson]

If you want some more param examples, you can take a look at the menu param code at my Templating-With-Twitter-Bootstrap [1] 
There is a sidebar menu to the right on the front page that contains Countries and ParamTest menu entry's.

[1] https://github.com/karma4u101/Templating-With-Twitter-Bootstrap

best regards
  Peter Petersson

On 09/22/2012 07:24 PM, maikklein wrote:

Thanks, okay I will experiment a little bit. :) --

[maikklein]

This is the first thing that is not quite obvious, but thanks to your examples I am pretty sure I will be able to get used to.

Thank you very much.

[Kevin Locke]

Sorry to be late, but if you are still struggling you may also find
the wiki page[1] to be helpful.

1. https://www.assembla.com/spaces/liftweb/wiki/Location_Parameters

Kevin

[maikklein]

thanks for the resources but somehow I permanently run into some issues.

code from: http://simply.liftweb.net/index-3.4.html#prev 

For example, I always get an exception, I uploaded the app to cloudfoundry so that you can see it

http://paramtest.cloudfoundry.com/form 

I defined a sitemap for /form

Menu.i("Form") / "form",

the form.html looks like this

<div id="main" class="lift:surround?with=default&at=content">
    <div>
        Params : <span class="lift:Param">???</span>
    </div>
</div>

and the snippet

package code
package snippet




import net.liftweb._
import util.Helpers._
import http._
import common._
import sitemap._
case class ParamInfo(theParam: String)


object Param {
  // Create a menu for /param/somedata
  val menu = Menu.param[ParamInfo]("Form", "Form",
    s => Full(ParamInfo(s)),
    pi => pi.theParam) / "form"
  lazy val loc = menu.toLoc
  def render = "*" #> (loc.currentValue.map(_.theParam))
}

Any idea why I get this exception?

[David Pollak]

Please include example code (please see https://www.assembla.com/wiki/show/liftweb/Posting_example_code ) so we can run your code and see what's happening.

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--
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Discussion: http://groups.google.com/group/liftweb
Stuck? Help us help you: https://www.assembla.com/wiki/show/liftweb/Posting_example_code
 
 
 

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