Lift Framework BindHelpers.attr Question (or better practice?)
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" />
...
加载中,请稍侯......
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