Re: [Cppcms-users] working with http::context.

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

On Tuesday 24 August 2010 09:07:21 pm Artyom wrote:
> If entry form fails validation you may just display any message you want
> outside widgets system. i.e.
> 
> if(request().request_method()=="POST") {
>    my_content.my_form.load(context());
>    if(!my_content.my_form.validate()) {
>       my_content.fail_flag = true;
>    }
> }
> 
> And in template system itself
> 
> <% if fail_flag %>
>    <strong>FAILED</strong>
> <% end %>
> <form ... >
> <% form as_p my_form %>
> </form>
> 

Thank you, Artyom. 
That's not exactly what I wanted to do, but you put me back on the right 
track. 
I wanted to be able to add messages for the user from within 
my_content.my_form.validate().

What I did is create a struct to hold messages:

struct user_messages {
        std::list<std::string> messages;
};

I add this struct to my base_content and pass it by reference to 
my_content.my_form.validate() so that I can populate it with actual messages 
according to the validation process.
Then I can output it within the template using a foreach loop.

There may be better ways, but it works for now. When I have more experience, I 
might come up with a more elegant solution.



> See example of forms.

Yes, I had studied it closely. Your examples are very useful and I reproduced 
them to learn from them.

> Also you can specify a number of reasons
> and add some flag to form you are created.

I am not too sure what you are referring to, here.


> No, http::context just preservers specific information for single
> request/response. You can't change or alter it.

Ok. That was my mistake. I was trying to store temporary data (i.e. data 
related to the current request only) somewhere in http::context instead of 
putting it into my class derived from cppcms::base_content, as you suggested 
above.

Anyway, your reply was very useful, as usual, and I managed to do more or less 
what I wanted. Thank you.


Augustin.



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