I've been looking at some of the other web frame works out there and my
own code looking for ideas to improve matters in erlyweb. One thing that
I've noticed is that I'm repeating things in the view that I've written
in the controller but only in a slightly different way. I've noticed
that many of the web developement frame works that don't use MVC use a
model and a canvas analogy to save on this repetition.
An example of what I'm thinking: create a page with a link and a form
with one text field and a submit button.
-module(simple_controller).
new(_A) ->
%% include a call back function with the link
Link = html_link:new("hello", fun() ->
"hello there!"
end),
TextField = html_input:text_field(),
Submit = html_input:submit(),
%% include a call back function with the form
Form = html_form:new(fun(Fields) ->
simple:process_new(Fields)
end),
Form1 = html_form:add(Form, TextField),
Form2 = html_form:add(Form1, Submit),
Base = html_div:new(),
Base1 = html_div:add(Base, Link),
Base2 = html_div:add(Base, Form),
Base2.
render(Layout) ->
html:render(Layout).
Rough internal representation,
{div, ..., [
{link, LinkId, "hello", CallBackFun},
{form, FormId, CallBack, [
{input, text_field, FieldId, Value},
{input, submit, SubmitId, undefined}
]
}
]
}
Output
<div>
<a href="http://server/simple/_12345_>hello</a>
<form action="http://server/simple/_12346_";>
<input type="text"/>
<input type="submit"/>
</form>
</div>
Now there's bound to be errors in the above, but I the basic idea should
be clear. The html is generated much like a GUI, say, wxwidgets or Qt.
call back functions are added to direct process flow, Ids are
automatically generated to direct processing to the correct callback.
Rest style URLs are still processed as is, ie http://server/simple/new
will call the above new/1 function.
There's still abit unclear about this. For example, what's the best way
to alter/add attributes to the html without it becoming to verbose.
This started as scribles in a note book as I waited for a meeting to
begin a couple of days ago and is being posted "as is" after I saw
yariv's posts about arc this morning.
Jeff.
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