lift snippet: prefix not bound to a namespace

StackOverflow https://stackoverflow.com/questions/1019599

  •  06-07-2019
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Question

im just starting with lift and scala and have a problem i dont realy understand.

i have the folowing index.html

<html>
<head><title>title</title></head>
<body>
    <table>
        <lift:Members.list>
            <tr>
                <td><m:nick/></td>
            </tr>
        </lift:Members.list>
    </table>
</body>
</html>

And the following snippet:

class Members {
  def list(xhtml: NodeSeq) =
  Member.findAll.flatMap(member => bind("m",xhtml
                                       ,"nick" -> member.nickName
    ))
}

for some reason i get the following error. ive tried alot of things but cant get it to work. whats wrong?

XML Parsing Error: prefix not bound to a namespace
Location: http://localhost:8080/hazardlift-1.0-SNAPSHOT/
Line Number 8, Column 25:<td><m:nick></m:nick></td>
-----------------------------^
Was it helpful?

Solution

Maybe lift doesn't get how to handle your return value. Try forcing an implicit conversion to NodeSeq by specifing it as returntype.

....
def list(xhtml: NodeSeq) : NodeSeq = 
....

OTHER TIPS

I just found another cause of this error - an unresolved tag.

I had this HTML:

<div >
    <h3>Request Information</h3>

    <lift:DetailedRequestData.renderContent>
        <f:rowTag></f:rowTag>
    </lift:DetailedRequestData.renderContent>
</div>

I had written this for renderContent:

def renderContent(ns: NodeSeq): NodeSeq = {
  val key = beginTrans(DisplayData.logger)
  var result = ns

  try {
    var requestID = DisplayData.getParameter("request")
    bind("f", ns, "rowTag" -> <p>Request ID: {requestID}</p>)
  }
  catch {
    case t: Throwable => DisplayData.logger.error("[DetailedRequestData$.renderContent] ", t)
  }

  endTrans(DisplayData.logger, key)
  result
}

Since I had not assigned the result of the bind to result, I was returning the unmodified NodeSeq and got the same prefix not bound to a namespace error. Changing the one statement to:

    result = bind("f", ns, "rowTag" -> <p>Request ID: {requestID}</p>)

Yes, this was my own stupid fault, but by documenting the problem here, hopefully I will save someone else from having this same problem and not knowing why.

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