Lift Framework BindHelpers.attr Question (or better practice?)_问答_开发者

Lift Framework BindHelpers.attr Question (or better practice?)

开发者 https://www.devze.com 2023-01-13 22:11 出处：网络

My problem is extracting xhtml attributes to generate absolute links, since they need to be different on testing and production

My problem is extracting xhtml attributes to generate absolute links, since they need to be different on testing and production environment. I would like to use a "global snippet" that binds all "src" and "href" attributes to "localhost:8080" or "www.mydomain.com" depending on a conf value.

This is how the template looks like:

<lift:Global>
  <html><body><a G:href="/somelink">some text</a></body></html>
</lift:Global>

And this is the Global.render method:

bind("G",template,
  AttrBindParam("href",Conf开发者_如何转开发.localhost
    +BindHelpers.attr("G","href").map(_.toString).getOrElse("none") ,"href")
)

But in the rendered page all I see is ... href="confValueNone".

What am I doing wrong? Is there a better way to configure for different environments?

I use AttributeSnippets now. They are a bit heavier on the template side, but result in cleaner snippets.

snippet:

import xml.{UnprefixedAttribute, MetaData}

...

def src(in:MetaData):MetaData = {
  new UnprefixedAttribute("src",Conf.localhost+in.value.toString,scala.xml.Null)
}

def href(in:MetaData):MetaData = {
  val out = new UnprefixedAttribute("href",Conf.localhost+in.value.toString,scala.xml.Null)
  out
}

template:

...
<script type="text/javascript" lift:Global.src="/inc/showdown.js" />
<link rel="stylesheet" type="text/css" lift:Global.href="/inc/style.css" />
...