Re: how to select checkbox based on a hashmap

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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