Re: how to select checkbox based on a hashmap

Ok, and what exactly is:

com.example.HasKeyMethod'?new()

I have to create a package, with a class named HasKeyMethod?

What is that exactly, a static method?  A HashMap (treemap)?

On Fri, Oct 19, 2012 at 8:09 AM, Daniel Dekany <[email protected]> wrote:

> Friday, October 19, 2012, 5:14:45 AM, S Ahmed wrote:
>
> > Ok so let me get this straight, in my .ftl (say if I put all of
> > this in my edit.ftl template for now):
> >
> > <#assign hasKey =
> > 'com.example.HasKeyMethod'?new()>`
> >
> >    <#list projects as project>
> >                      <tr>
> >                          <td><label class="checkbox"><input
> > id="project-${project.id}" name="project-${project.id}"
> > type="checkbox" />${project.name}</label></td>
> >                      </tr>
> >    </#list>
> >
> > And then inside the list above I do:
> >
> > <#if hasKey(userProjects, project.id)>
> > </#if>
> >
> > Is that it?
>
> Yes. Although it's nicer to put the creating of "hasKey" outside the
> template that uses it, because it's something that you may want to use
> in more templates over time. In a serous app you often end up with
> some utils.ftl anyway... that's a good place. (I also prefer #import
> over #include, and of course after <#import '/utils.ftl' as u> you
> have to write `u.hasKey(userProjects, project.id)`.)
>
> --
> Best regards,
>  Daniel Dekany
>
>
> > On Thu, Oct 18, 2012 at 4:25 AM, Daniel Dekany <[email protected]>
> wrote:
> > Thursday, October 18, 2012, 3:22:37 AM, S Ahmed wrote:
> >
> >> So I have a hashmap that contains the projects that the checkbox should
> be checked for:
> >>
> >> Map<Integer, Project> userProjects = new HashMap<Integer, Project>();
> >>
> >> So far my .ftl looks like:
> >>
> >>   <#list projects as project>
> >>                     <tr>
> >>                         <td><label class="checkbox"><input
> >> id="project-${project.id}" name="project-${project.id}"
> >>
> >> type="checkbox" />${project.name}</label></td>
> >>                     </tr>
> >>                 </#list>
> >>
> >> How can I make the checkbox 'checked' if the hashMap contains an entry?
>  The key is project.id
> >
> > There your run into the good old string-keys-only issue of FM... one
> > of the main pains (the other being not supporting null as valid
> > value).
> >
> > What I always did is not using the Default object-wrapper of FM, which
> > is still like it is for backward compatibility. I have always used
> > BeansWrapper instead (maybe extended by me) with
> > setSimpleMapWrapper(true). It has a hack to work around the problem
> > that `map[key]` expects strings; you can write map(key) instead, where
> > `key` can be of any type. Then you can do `<#if
> > userProjects(project.id)??> checked</#if>`.
> >
> > If changing the object wrapper is not an option (due to
> > compatibility), for now you will have to create a
> > TemplateMethodModelEx for this (`<#assign hasKey =
> > 'com.example.HasKeyMethod'?new()>` in some commonly included/imported
> > template and then `<#if hasKey(userProjects, project.id)>` in the
> > normal templates). (Adding built-ins to do things like this is high on
> > my TODO BTW.)
> >
> > --
> > Best regards,
> >  Daniel Dekany
> >
> >
> >
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>
>
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