Re: how to select checkbox based on a hashmap

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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