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Jose Pepe

2006-Oct-01 21:21 UTC

How to create a very simple form

Hi all,

I would like to create a very simple form with RoR similar to this one 
in ASP.Net:
http://quickstarts.asp.net/QuickStartv20/aspnet/samples/ctrlref/standard/TextBox/TextBox1_vb.aspx


I my RoR project I want to add a Greeter class like this one:
class Greeter
  def initialize(name = "World")
    @name = name
  end
   def say_hi
     puts "Hi #{@name}!"
   end
  def say_bye
     puts "Bye #{@name}, come back soon."
   end
 end

my form will have two buttons one for "Hi!" and the other for
"Bye!", a
text box to enter a name, and a label to display the whole message. So 
if the user enters "Joe" and clicks the button "Hi", the
label will
display "Hi Joe"

How do I create a Viewer that instantiates the class Greeter, and shows 
a message after the user click on a button.

In a ASP.Net project in the code behind the button, on the click event I 
will have to add something like this:

g = Greeter.new(<value entered on the text box>)

<label> = g.say_hi

How can I do it in RoR. I am interesed in the controller and viewer(s).

thanks




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Jose Pepe

2006-Oct-02 12:55 UTC

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Re: How to create a very simple form

Help!!!

Where can I find information about how to add submit buttons to a form?

thanks




Jose Pepe wrote:> Hi all,
> 
> I would like to create a very simple form with RoR similar to this one 
> in ASP.Net:
>
http://quickstarts.asp.net/QuickStartv20/aspnet/samples/ctrlref/standard/TextBox/TextBox1_vb.aspx
> 
> 
> I my RoR project I want to add a Greeter class like this one:
> class Greeter
>   def initialize(name = "World")
>     @name = name
>   end
>    def say_hi
>      puts "Hi #{@name}!"
>    end
>   def say_bye
>      puts "Bye #{@name}, come back soon."
>    end
>  end
> 
> my form will have two buttons one for "Hi!" and the other for
"Bye!", a
> text box to enter a name, and a label to display the whole message. So 
> if the user enters "Joe" and clicks the button "Hi",
the label will
> display "Hi Joe"
> 
> How do I create a Viewer that instantiates the class Greeter, and shows 
> a message after the user click on a button.
> 
> In a ASP.Net project in the code behind the button, on the click event I 
> will have to add something like this:
> 
> g = Greeter.new(<value entered on the text box>)
> 
> <label> = g.say_hi
> 
> How can I do it in RoR. I am interesed in the controller and viewer(s).
> 
> thanks

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Bill Walton

2006-Oct-02 13:15 UTC

head link

Re: How to create a very simple form

Hi Jose,

Do you want to add "buttons"?  Or "a button"?

The former is not allowed re: the W3C HTML spec.  Rails shows you how to do 
the latter when you generate scaffolding for an app.  Check out, for 
example, the new.rhtml view.

hth,
Bill

----- Original Message ----- 
From: "Jose Pepe"
<rails-mailing-list-ARtvInVfO7ksV2N9l4h3zg@public.gmane.org>
To: <rubyonrails-talk-/JYPxA39Uh5TLH3MbocFFw@public.gmane.org>
Sent: Monday, October 02, 2006 7:55 AM
Subject: [Rails] Re: How to create a very simple form

>
> Help!!!
>
> Where can I find information about how to add submit buttons to a form?
>
> thanks
>
>
>
>
> Jose Pepe wrote:
>> Hi all,
>>
>> I would like to create a very simple form with RoR similar to this one
>> in ASP.Net:
>>
http://quickstarts.asp.net/QuickStartv20/aspnet/samples/ctrlref/standard/TextBox/TextBox1_vb.aspx
>>
>>
>> I my RoR project I want to add a Greeter class like this one:
>> class Greeter
>>   def initialize(name = "World")
>>     @name = name
>>   end
>>    def say_hi
>>      puts "Hi #{@name}!"
>>    end
>>   def say_bye
>>      puts "Bye #{@name}, come back soon."
>>    end
>>  end
>>
>> my form will have two buttons one for "Hi!" and the other for
"Bye!", a
>> text box to enter a name, and a label to display the whole message. So
>> if the user enters "Joe" and clicks the button
"Hi", the label will
>> display "Hi Joe"
>>
>> How do I create a Viewer that instantiates the class Greeter, and shows
>> a message after the user click on a button.
>>
>> In a ASP.Net project in the code behind the button, on the click event
I
>> will have to add something like this:
>>
>> g = Greeter.new(<value entered on the text box>)
>>
>> <label> = g.say_hi
>>
>> How can I do it in RoR. I am interesed in the controller and viewer(s).
>>
>> thanks
>
>
> -- 
> Posted via http://www.ruby-forum.com/.
>
> > 

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Jose Pepe

2006-Oct-03 00:01 UTC

head link

Re: How to create a very simple form

Bill

To make it simpe lest say that I want to create a form with only on 
button, and a text box. Whe the user enters his/her name in the text 
box, and clicks the button, a message says "Hello X"

I am just learning and looking for a very simple example without any 
database access.

Where can I get any inforation about that?

thanks


 Walton wrote:> Hi Jose,
> 
> Do you want to add "buttons"?  Or "a button"?
> 
> The former is not allowed re: the W3C HTML spec.  Rails shows you how to 
> do
> the latter when you generate scaffolding for an app.  Check out, for
> example, the new.rhtml view.
> 
> hth,
> Bill
> 
> ----- Original Message -----
> From: "Jose Pepe"
<rails-mailing-list-ARtvInVfO7ksV2N9l4h3zg@public.gmane.org>
> To: <rubyonrails-talk-/JYPxA39Uh5TLH3MbocFFw@public.gmane.org>
> Sent: Monday, October 02, 2006 7:55 AM
> Subject: [Rails] Re: How to create a very simple form

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Jose Pepe

2006-Oct-03 01:00 UTC

head link

Re: How to create a very simple form

hi again

I would like to convert to Ror this HTML folr:
<body>
<form name="form1" method="post" action="">
  <p>Enter Your Name:
    <input name="textName" type="text"
id="textName">
</p>
  <p><label>This is  a label</label>&nbsp;</p>
  <p>
    <input name="btnHello" type="submit"
id="btnHello" value="Hello!!">

  </p>
</form>
</body>


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Max Muermann

2006-Oct-03 01:22 UTC

head link

Re: How to create a very simple form

On 10/3/06, Jose Pepe
<rails-mailing-list-ARtvInVfO7ksV2N9l4h3zg@public.gmane.org>
wrote:>
> hi again
>
> I would like to convert to Ror this HTML folr:
> <body>
> <form name="form1" method="post"
action="">
>   <p>Enter Your Name:
>     <input name="textName" type="text"
id="textName">
> </p>
>   <p><label>This is  a label</label>&nbsp;</p>
>   <p>
>     <input name="btnHello" type="submit"
id="btnHello" value="Hello!!">
>
>   </p>
> </form>
> </body>
>
>
All you really need to do is to use a "railsy" form tag and set a
value for the label:

<%= start_form_tag :controller=>''test'',
:action=>''say_hello'' %>
  <p>Enter your Name
...
  <label><%= @message %></label>
  </p>
<%= end_form_tag %>

This will render a <form action="/test/say_hello" ...> form tag,
which
will then get routed to your test_controller, which you create like
this:

ruby script/generate controller test

and then you add a method say_hello:

class TestController < ApplicationController
  def say_hello
    @message= "Hello " + params[:textName]
  end
end

This assigns a string to the @message instance variable of the
controlle,r which then gets rendered in the view inside the label.

I''d also recommend reading a few RoR tutorials to get your head around
the MVC pattern as implemented in Rails. Without understanding what
MVC means and how it works, you won''t get very far with Rails.

Cheers,
Max

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Jose Pepe

2006-Oct-03 11:59 UTC

head link

Re: How to create a very simple form

Max

Adding an initialize method on the class TestController:

 class TestController < ApplicationController
   def initialize(name = "World")
     @name = name
   end
    def say_hi
      @message="Hi #{@name}!"
    end
   def say_bye
      @message="Bye #{@name}, come back soon."
    end
  end


Do I need to replace the action
":action=>''say_hello''" by somethig like
:action=>''initialize''?  how do I get the say_hi method?

Thank you



 Muermann wrote:> On 10/3/06, Jose Pepe
<rails-mailing-list-ARtvInVfO7ksV2N9l4h3zg@public.gmane.org> wrote:
>>   <p>
>>     <input name="btnHello" type="submit"
id="btnHello" value="Hello!!">
>>
>>   </p>
>> </form>
>> </body>
>>
>>
> 
> All you really need to do is to use a "railsy" form tag and set a
> value for the label:
> 
> <%= start_form_tag :controller=>''test'',
:action=>''say_hello'' %>
>   <p>Enter your Name
> ...
>   <label><%= @message %></label>
>   </p>
> <%= end_form_tag %>
> 
> This will render a <form action="/test/say_hello" ...> form
tag, which
> will then get routed to your test_controller, which you create like
> this:
> 
> ruby script/generate controller test
> 
> and then you add a method say_hello:
> 
> class TestController < ApplicationController
>   def say_hello
>     @message= "Hello " + params[:textName]
>   end
> end
> 
> This assigns a string to the @message instance variable of the
> controlle,r which then gets rendered in the view inside the label.
> 
> I''d also recommend reading a few RoR tutorials to get your head
around
> the MVC pattern as implemented in Rails. Without understanding what
> MVC means and how it works, you won''t get very far with Rails.
> 
> Cheers,
> Max

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Max Muermann

2006-Oct-03 22:47 UTC

head link

Re: How to create a very simple form

On 10/3/06, Jose Pepe
<rails-mailing-list-ARtvInVfO7ksV2N9l4h3zg@public.gmane.org>
wrote:>
> Max
>
> Adding an initialize method on the class TestController:
>
>  class TestController < ApplicationController
>    def initialize(name = "World")
>      @name = name
>    end
>     def say_hi
>       @message="Hi #{@name}!"
>     end
>    def say_bye
>       @message="Bye #{@name}, come back soon."
>     end
>   end
>
>
> Do I need to replace the action
":action=>''say_hello''" by somethig like
> :action=>''initialize''?  how do I get the say_hi
method?
>
"initialize" is the name for the constructor in ruby. You should not
really need to implement a constructor for what you are doing, and you
should definitely not call "initialize" as an action from your view.

When a request comes in, rails will execute the method corresponding
to the action name, so to just call say_hi, you can use
:action=>''say_hi''.

As you want to have different behaviour depending on which button was
pressed, you can use the fact that the browser will send the value of
the submit button that was used to submit the form.

Print out the contents of the params array as the first statement in
your action (p params) and see if you can find the button in there.
From theree, it is easy enough to write an if statement that - based
on the existence of a specific button value in the params - sets the
message to the correct one.

Give it a try and let me know if you get stuck.

Cheers,
Max

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Jose Pepe

2006-Oct-05 00:52 UTC

head link

Re: can''t convert nil into string

Max,

I am gettng an error message:

can''t convert nil into string

here is my controller:
class GreetController < ApplicationController
def say_hi
    @message= "Hello " + params[:textName]
  end
end


and my viewer
<html>
<head>
<title> Hello!!!</title>
</head>
<body>
<%= start_form_tag :controller=>''greet'',
:action=>''say_hi'' %>
  <p>Enter Your Name:
  <%= text_field_tag :textName, :size=> 20  %>
</p><p>
<label><%= @message %></label>
</p>
  <p>
  <%= submit_tag( "Hello") %>
  </p>
<%= end_form_tag %>
</body>
</html>

What is wrong?

 Muermann wrote:> On 10/3/06, Jose Pepe
<rails-mailing-list-ARtvInVfO7ksV2N9l4h3zg@public.gmane.org> wrote:
>>       @message="Hi #{@name}!"
>>     end
>>    def say_bye
>>       @message="Bye #{@name}, come back soon."
>>     end
>>   end
>>
>>
>> Do I need to replace the action
":action=>''say_hello''" by somethig like
>> :action=>''initialize''?  how do I get the say_hi
method?
>>
> 
> "initialize" is the name for the constructor in ruby. You should
not
> really need to implement a constructor for what you are doing, and you
> should definitely not call "initialize" as an action from your
view.
> 
> When a request comes in, rails will execute the method corresponding
> to the action name, so to just call say_hi, you can use
> :action=>''say_hi''.
> 
> As you want to have different behaviour depending on which button was
> pressed, you can use the fact that the browser will send the value of
> the submit button that was used to submit the form.
> 
> Print out the contents of the params array as the first statement in
> your action (p params) and see if you can find the button in there.
> From theree, it is easy enough to write an if statement that - based
> on the existence of a specific button value in the params - sets the
> message to the correct one.
> 
> Give it a try and let me know if you get stuck.
> 
> Cheers,
> Max

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Jose Pepe

2006-Oct-05 01:36 UTC

head link

Re: can''t convert nil into string

here is the whole error message:

 TypeError in GreetController#say_hi

can''t convert nil into String

RAILS_ROOT: script/../config/..
Application Trace | Framework Trace | Full Trace

app/controllers/greet_controller.rb:3:in `+''
app/controllers/greet_controller.rb:3:in `say_hi''
-e:4:in `load''
-e:4






Jose Pepe wrote:> Max,
> 
> I am gettng an error message:
> 
> can''t convert nil into string
> 
> here is my controller:
> class GreetController < ApplicationController
> def say_hi
>     @message= "Hello " + params[:textName]
>   end
> end
> 
> 
> and my viewer
> <html>
> <head>
> <title> Hello!!!</title>
> </head>
> <body>
> <%= start_form_tag :controller=>''greet'',
:action=>''say_hi'' %>
>   <p>Enter Your Name:
>   <%= text_field_tag :textName, :size=> 20  %>
> </p><p>
> <label><%= @message %></label>
> </p>
>   <p>
>   <%= submit_tag( "Hello") %>
>   </p>
> <%= end_form_tag %>
> </body>
> </html>
> 
> What is wrong?
> 
>  Muermann wrote:
>> On 10/3/06, Jose Pepe
<rails-mailing-list-ARtvInVfO7ksV2N9l4h3zg@public.gmane.org> wrote:
>>>       @message="Hi #{@name}!"
>>>     end
>>>    def say_bye
>>>       @message="Bye #{@name}, come back soon."
>>>     end
>>>   end
>>>
>>>
>>> Do I need to replace the action
":action=>''say_hello''" by somethig like
>>> :action=>''initialize''?  how do I get the
say_hi method?
>>>
>> 
>> "initialize" is the name for the constructor in ruby. You
should not
>> really need to implement a constructor for what you are doing, and you
>> should definitely not call "initialize" as an action from
your view.
>> 
>> When a request comes in, rails will execute the method corresponding
>> to the action name, so to just call say_hi, you can use
>> :action=>''say_hi''.
>> 
>> As you want to have different behaviour depending on which button was
>> pressed, you can use the fact that the browser will send the value of
>> the submit button that was used to submit the form.
>> 
>> Print out the contents of the params array as the first statement in
>> your action (p params) and see if you can find the button in there.
>> From theree, it is easy enough to write an if statement that - based
>> on the existence of a specific button value in the params - sets the
>> message to the correct one.
>> 
>> Give it a try and let me know if you get stuck.
>> 
>> Cheers,
>> Max

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