Is possible to extend a control?

could please explain what are you trying to add, how will this functionality work from the user's pov ?

at 17 Jan 2014 Omu

I want to call a server action to retreive information in json, instead of call an action and retreive a pair id-name like now, and call a client-side function passing the json to refresh the UI (value of inputs and enable/disable/visible elements).

I've done this functionality in very older version of Lookup control, and I'm upgrating to the lastest version and I'm lossing this key functionality.

The simplest way I see is to extend the class LookUp to do this, doing in the same way Awe() controls set properties. But I can't "put"/extend the class.

at 17 Jan 2014 sgambolati

could you please explain from the user point of view what are you trying to build, and why do you need additional lookup functionality for it ?

at 17 Jan 2014 Omu

The user open the lookup, choose a row, and some controls in the page are visibled and anothers are invisibled.

at 17 Jan 2014 sgambolati

you can bind to the js change event of the lookup and show/hide depending on it's value, why do you need additional lookup functionality for this ?

at 17 Jan 2014 Omu

I know it. Inneed, I would do that. But I've a hundreds of lookup with that funcionality that I've got it with the old .aspx files with "open source".

at 17 Jan 2014 sgambolati

not sure how your additional functionality works but I think one script in Site.master should do it, something like $(document).on('change','.awe-lookup-field input', refreshfunc) 
you can also set html data attributes on each lookup and use them in the function, e.g. function rereshfunc(){ var myval = $(this).data('myattr'); }

at 17 Jan 2014 Omu

I know that is possible to do with js stuff, but I'm interesed to do this more efficently once on the 'control-extend-code' and forget until I want to change all the controls and not to change one by one on a modification.
I would be happy if I can override the "render" method of the control to add my custom funcionality.

at 20 Jan 2014 sgambolati

you can't override render, but if you could what would you add ?

at 20 Jan 2014 Omu

If I could override render, I can add my custom implementation for example, the JsonCallBack I've asked.

at 21 Jan 2014 sgambolati

could you show the code

at 21 Jan 2014 Omu

edited question
Implementation: 
@Html.Awe().MyCustomLookupAttr(x => x.MealId).JsonCallBack("refreshJsonData", "GetJson")

at 21 Jan 2014 sgambolati

it looks like you could just wrap it, create a new helper and call the lookup helper inside of it

at 21 Jan 2014 Omu

Can you please show how. Because that code does not compile because i cannot call an internal method like Render.

at 21 Jan 2014 sgambolati

something like:
     public static class MyHelpers
     {
          public static string MyLookup(this HtmlHelper html, string name)
          {
               return html.Awe().Lookup(...) + "my html";
          }
     }

at 21 Jan 2014 Omu

Is possible to extend a control?

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