[erlang-questions] ANN: ezwebframe - an easy web framework

Joe Armstrong <>
Thu Dec 13 12:13:42 CET 2012


On Thu, Dec 13, 2012 at 11:45 AM, Loïc Hoguin <> wrote:

> On 12/13/2012 11:17 AM, Joe Armstrong wrote:
>
>> ezwebframe
>> ==========
>>
>> https://github.com/joearms/**ezwebframe<https://github.com/joearms/ezwebframe>
>>
>> Pronounced "Easy web frame."
>>
>> About
>> =====
>>
>> Ezwebframe attempts to make web programming just a little bit easier.
>>
>>  From Erlang point of view the browser *is* an Erlang process.
>>
>> Assume we have a web page populated with divs. For example:
>>
>>      <div id="a">
>>        ...
>>      </div>
>>
>>      <div id="b">
>>        ...
>>      </div>
>>
>> Erlang thinks the browser is a process. To fill div a with HTML an
>> Erlang process evaluates the command:
>>
>>       Browser ! [{cmd, fill_div}, {id, a}, {txt, B}]
>>
>> Where B is a binary containing HTML.
>>
>
> Why not implement this for the modifications instead, though? It's well
> defined and works very well: http://taconite.sourceforge.**net/<http://taconite.sourceforge.net/>
>

I don't understand ...

What actually happens is this ...

     Browser ! [{cmd, fill_div}, {id, X}, {txt, Y}]

gets converted to the JS function call

    fill_div(o)

where o = {cmd:'fill_div', id:X, txt:Y}

and I have pre-defined

fill_div as

function fill_div(o){
     $("#" + o.id).html(o.txt);
}

(assumes jQuery)

If you want to extend the system you say

     Browser ! [{cmd,new_cmd},{x,...},{y,...}]

and supply a new js function new_cmd(o) which will be called with
o = {cmd:'new_cmd'},{x,...},...}

This provides an extensible abstract interface between the browser and
Erlang.

Websockets + JSON + a tiny bit of glue = good stuff

/Joe





>
> Don't need to be XML of course, but the actions defined are a good start
> of what frontend people usually want.
>


So if you want an action kick_ball I'd write

     Browser ! [{cmd,kick_ball}, {velocity, 23}, ...]

in Erlang, and provide some JS to do the kicking

    function kick_ball(o){
         ...
     }

which would be called with o = {cmd:'kick_ball', velocity:23, ...}

/Joe




>
> --
> Loďc Hoguin
> Erlang Cowboy
> Nine Nines
> http://ninenines.eu
>
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