Use of <portlet:namespace> with Spring Form tag library

[Paulieb12]

We are developing a portlet using the Spring Portlet MVC.

Within our JSPs, we are trying to use the <portlet:namespace> tag to ensure that IDs are unique to a specific instance of the portlet. However, if we try to use the <portlet:namespace> tag within a Spring Form tag, the <portlet:namespace> tag is not recognised and is treated as text. The <portlet:namespace> tag works fine with 'ordinary' html tags

e.g. for an ordinary html input field, the following JSP code will generate an input element with the id prefixed with the portlet namespace (such as "specificnamespacefield1")

<input id="<portlet:namespace/>field1">

For a Spring form input field, the following JSP code does not recognise that the portlet namespace and will generate an input element with an id of "<portlet:namespace/>field1"

<form:input id="<portlet:namespace/>field1">

Does anyone know how to prefix a Spring form tag id with a portlet namespace?

[Marten Deinum]

You cannot. The id/name/path property only allow textual input not nesting of other tags. Which is what you experience... You can use ${somevalue} however I'm not familiar with the portlet namespace but if you could declare a parameter which holds the result of <portlet:namespace/> you could use that notation.

[Paulieb12]

Thanks. We got around it with this.

<c:set var="portletnamespace" value="<%= renderResponse.getNamespace() %>"/>
<form:input id="${portletnamespace}field1">

[johnalewis]

Two other options:

You should be able to use this:
<c:set var="ns"><portlet:namespace /></c:set>

Although IBM had some buggy versions of the taglib floating around that had a bug flush call in them that made this blow up, so test it first.

Make the call to renderResponse.getNamespace() in your Controller and pass the namespace in as part of the Model. (If you are using SimpleFormController, include it as "referenceData")

[Jörg Heinicke]

for an ordinary html input field, the following JSP code will generate an input element with the id prefixed with the portlet namespace (such as "specificnamespacefield1")

<input id="<portlet:namespace/>field1">

For a Spring form input field, the following JSP code does not recognise that the portlet namespace and will generate an input element with an id of "<portlet:namespace/>field1"

<form:input id="<portlet:namespace/>field1">

The difference between these both is that the first is not an ordinary html tag, it's actually no tag at all in the JSP sense. It's just a bunch of characters including a <.

The second example is indeed a tag, there is a tag handler for form:input.

Furthermore I think it is not possible to nest tags in JSPs at all. But somebody might correct me on this.

Joerg

[Javix]

I'm developing a web application (no portlet), my application have to print some controls html with the same ID, for example:

<div id="myID" />
<div id="myID" />

Can I implement something like : <div id="<portlet:namespace/>myID" /> ??

And How Could I get that value with JQuery/javascript?