cppcms-users

[Cppcms-users] rendering list of widgets::checkbox

[augustin <aug...@ov...>]

Hello Artyom,

I have a form with a series of checkboxes. The number of checkboxes is 
variable and know at run time.

I figured I could use a std::list of widgets::checkbox, and declare that within 
my form struct, but I am wondering how to render this in the template:
http://art-blog.no-
ip.info/wikipp/en/page/cppcms_1x_templates_comm#Rendering.Forms

Will cppcms iterate itself over any STL class like a list or a map? 
A form containing simple widgets is easy enough to render:
<% form as_p info %>
but how would that look like if the form includes a std::list of widgets?

Thanks,

Augustin.





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Re: [Cppcms-users] rendering list of widgets::checkbox

[augustin <aug...@ov...>]

I thought maybe my approach was too complicated, so I tried another approach 
which I thought would be simpler, but in vain.

Instead of using a std::list, I don't declare any checkbox widgets in the form 
struct, i.e. I don't declare them in the header file.
Instead, I try to introduce new form elements in the .cpp file by declaring a 
new widget in my content's form element, like this:
cppcms::widgets::checkbox c.form.check = cppcms::widgets::checkbox();
where c.form is the base form, but I get the compile error:
error: expected initializer before ‘.’ token

Attached is a patch against examples/forms/hello.cpp that shows what I'm 
trying to do.
Bonus: the first hunk in the patch is for a typo fix.

Thanks.

Augustin.




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Re: [Cppcms-users] rendering list of widgets::checkbox

[Artyom <art...@ya...>]

> Instead of using a  std::list, I don't declare any checkbox widgets in the form 
>

> struct, i.e. I  don't declare them in the header file.
> Instead, I try to introduce new form  elements in the .cpp file by declaring a 

> new widget in my content's form  element, like this:
> cppcms::widgets::checkbox c.form.check =  cppcms::widgets::checkbox();
> where c.form is the base form, but I get the  compile error:
> error: expected initializer before ‘.’ token
> 


See, C++ is not dynamically typed language, you can't add member 
to structure dynamically.

Artyom


      

Re: [Cppcms-users] rendering list of widgets::checkbox

[augustin <aug...@ov...>]

On Thursday 10 March 2011 08:20:09 pm Artyom wrote:
> > new widget in my content's form  element, like this:
> > cppcms::widgets::checkbox c.form.check =  cppcms::widgets::checkbox();
> > where c.form is the base form, but I get the  compile error:
> > error: expected initializer before ‘.’ token
> > 
> 
> See, C++ is not dynamically typed language, you can't add member 
> to structure dynamically.

Oh! Of course I knew about strong types in C++ yet I still overlook some of 
the consequences of that. Old PHP habits die hard ;-/
Thank you for pointing this out to me.

Blessings,

Augustin.






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