is it possible to create a custom JSTL tag that accepts a non-string attribute?
I would like to create a tag that would be handle pagination using PagedListHolder from Spring MVC.
<%@tag body-content="scriptless" description="basic page template" pageEncoding="UTF-8"%>
<%-- The list of normal or fragment attributes can be specified here: --%>
<%@attribute name="pagedList" required="true" %>
<%-- any content can be specified here e.g.: --%>
<%@taglib prefix="c" uri="http://java.sun.com/jsp/jstl/core"%>
<c:choose>
<c:when test="${!pagedList.firstPage}">
<a href="
<c:url value="pagedList">
<c:param name="page" value="${pagedList.page - 1}"/>
</c:url>
"><<
</a>
</c:when>
<c:otherwise>
<<
</c:otherwise>
</c:choose>
<%-- ...more --%>
This tag would require an instance of PagedListHolder class.
Sort of like this, but I realize this is not valid.
<templ:pagedList pagedList="${players}"/>
Do I need to write a tag handler to achieve this?
You can just specify the type
attribute on the attribute directive.
<%@ attribute name="pagedList" required="true" type="org.springframework.beans.support.PagedListHolder" %>
In short: JSTL tags are allowed to have non-string attributes, as you're using spring mvc, your tag class could look like this:
public class PagedListTag extends RequestContextAwareTag {
private PagedListHolder pagedList;
@Override
protected int doStartTagInternal() throws Exception {
// do something with pagedList
return SKIP_BODY;
}
@Override
public void doFinally() {
this.pagedList = null;
super.doFinally();
}
public void setPagedListed(PagedListHolder pagedList) {
this.pagedList = pagedList;
}
}
The only thing you have to do is to register it properly with the pagedList attribute in your .tld file:
...
<tag>
<name>pagedList</name>
<tag-class>PagedListTag</tag-class>
<body-content>JSP</body-content>
<attribute>
<name>pagedList</name>
<required>true</required>
<rtexprvalue>true</rtexprvalue>
</attribute>
</tag>
...
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