JSTL submit form with a condition and relative url does not work

Question

The following is form for create or upadte a Post object(I use the spring form tag also):

<sf:form method="<c:choose><c:when test="${post.id==0}">post</c:when><c:otherwise>put</c:otherwise></c:choose>" commandName="post">
    Title:<sf:input path="title" /><sf:errors path="title" /><br />
    Body:<sf:textarea path="body" cols="70" rows="6" /><sf:errors path="body" /><br />
</sf:form>

And when the post.id==0,it means that this post is to be created while the method of the form should be "POST",otherwise it is updated and the method will be "PUT".

But the above code will cause exception:

org.apache.jasper.JasperException: /WEB-INF/jsp/posts/_form.jsp (line: 5, column: 41) Unterminated &lt;sf:form tag

What's the problem,how to fix it?

update:

for the action it should be :

<c:url value="/posts/" /> for create and 
<c:url value="/posts/${post.id}/" /> for update.

Then the finally action will be /appcontext/posts or

/appcontext/posts/1

update2:

For action I can use :

${post.id == 0 ? '/posts/' : '/posts/${post.id}'}

However,this note the '/' in the url, it will be relatived to the host.

That's to say,the form action will be:

http://localhost/posts

While I want it be:

http://localhost/context/posts

That's why I perfer <c:url> which will add the context for me.

And I want this manner:

${post.id == 0 ? '<c:url value="/posts/" />' : '<c:url value="/posts/${post.id}"/>'}

Which does not work.

score 1 · Accepted Answer · edited May 23 '17 at 12:12

1

You use tags in the property of an other tag. The " is nested.

Try this:

 <sf:form method="${post.id == 0 ? 'post' : 'put'}" commandName="post"
          action="${post.id == 0 ? './posts/' : './posts/${post.id}'}">
    ...

    <input type="submit" value="Submit" name="submit" />
    or
    <a href="#" onClick="submit();">submit with link and JavaScript</a>

 </sf:form>


 <c:url value="${post.id == 0 ? './posts/' : './posts/${post.id}'}" var="url">
 </c:url>

 <a href="${url}">Huhu ein Link</a>

If you use ./ it will refer to the same path. You can also get the context path via request.getContextPath() in your JSP Page or Servlet.

Take a look here.

> ${post.id == 0 ? '<c:url value="/posts/" />' : '<c:url
> value="/posts/${post.id}"/>'}

This can not work too, it is also nested again. Please read the Java Tutorial.

edited May 23 '17 at 12:12

Community

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answered Aug 31 '12 at 08:38

edze

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how about the action? it should be `/posts/`for create and `/posts/1/`for update. – hguser Aug 31 '12 at 09:16
How do you determine if it is create or update? `action="/${post.id == 0 ? 'post' : 'put'}/${post.id}"` this way? – edze Aug 31 '12 at 09:28
`action="/posts/${post.id != 0 ? '1/' : ''}"` – edze Aug 31 '12 at 14:27
`${ condition ? value_if_condition_true : value_else }` – edze Aug 31 '12 at 14:30
I have to use c:url to build the action which will relative to the application context path – hguser Aug 31 '12 at 23:14
It works the same way like with action. Please read the tut http://docs.oracle.com/javaee/5/tutorial/doc/bnakc.html – edze Sep 01 '12 at 07:45
That is simple HTML. Make it with `./posts/1/`. An alternative is use `request.getContextPath()` – edze Sep 01 '12 at 12:24
http://stackoverflow.com/questions/296873/basic-html-how-to-set-relative-path-to-current-folder – edze Sep 01 '12 at 12:24
that's to say,I can never use the url tag inside the form tag? – hguser Sep 01 '12 at 12:48

JSTL submit form with a condition and relative url does not work

1 Answers1