how to generate barcode in c# net with example ACTION PACK: WORKING WITH THE VIEW AND THE CONTROLLER in Font

Generator QR in Font ACTION PACK: WORKING WITH THE VIEW AND THE CONTROLLER

CHAPTER 6 ACTION PACK: WORKING WITH THE VIEW AND THE CONTROLLER
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COMMON LAYOUT CONVENTIONS
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A few conventions apply to working with layouts: A layout named application.rhtml will be applied automatically unless a more specific candidate exists or is explicitly specified in the controller. A layout that matches the name of a controller will be automatically applied if present. Controllerspecific layouts take precedence over the application-level layout. You can use the layout directive at the class level in any controller (that is, not inside an action) to set the layout for the entire controller: layout 'my_layout'. You can include a layout for a specific action with an explicit call to render inside the action: render :layout => 'my_layout'. Sometimes you want to render an action without a layout. In that case, you can pass false in place of the layout name: render :layout => false. In practice, we usually just use application.rhtml and rarely take advantage of the controllerspecific layout functionality. On the occasions when we need to use a different layout for a particular controller, we use the layout directive.
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Creating a Registration Form
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Enough tire-kicking. Let s add some real code to the new template so you can see it in action. The new action has a single purpose: to initialize and display the form for creating a new user. The actual creation of a new User object is the responsibility of the User model (remember our discussions of the model back to s 4 and 5), but it s orchestrated by the controller. Moreover, it needs data (like a login and password), which it must procure from somewhere. We re going to extract this information from HTML form elements, which we ll place in the template and handle in the controller. Let s design the form now. Edit new.rhtml so that it looks like Listing 6-4.
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Listing 6-4. Updated app/views/users/new.rhtml
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<h2>User Registration</h2> <% form_tag :action => 'create' do %> <p><label>Login:<br /> <%= text_field :user, :login %></label></p>
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CHAPTER 6 ACTION PACK: WORKING WITH THE VIEW AND THE CONTROLLER
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<p><label>Email:<br /> <%= text_field :user, :email %></label></p> <p><label>Password:<br /> <%= password_field :user, :password %></label></p> <p><label>Password confirmation:<br /> <%= password_field :user, :password_confirmation %></label></p> <p><%= submit_tag 'Sign up!' %></p> <% end %>
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We re using form helpers here for each of our fields. Refresh your browser again, and you ll see they function to produce a nicely formatted HTML form. Use your browser s view source command to look at the HTML that was generated.
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<h2>User Registration</h2> <form action="/users/create" method="post"> <p><label>Login:<br /> <input id="user_login" name="user[login]" size="30" type="text" /></label></p> <p><label>Email:<br /> <input id="user_email" name="user[email]" size="30" type="text" /></label></p> <p><label>Password:<br /> <input id="user_password" name="user[password]" size="30" type="password" /></label></p> <p><label>Password confirmation:<br /> <input id="user_password_confirmation" name="user[password_confirmation]" size="30" type="password" /></label></p> <p><input name="commit" type="submit" value="Sign up!" /></p> </form>
Here, you can see the generated HTML. Note the way in which Rails formats the name attribute of each form element: model[attribute]. This helps when it comes to parsing the parameters from the form, which you ll see shortly. If you were to manually create your form elements (which you need to do sometimes), you could use this naming convention to make sure your form values are easy to parse in the controller. Most of the time, though, you ll use form helpers when working with forms, especially when dealing with Active Record objects. Let s spend some time discussing form helpers now.
CHAPTER 6 ACTION PACK: WORKING WITH THE VIEW AND THE CONTROLLER
Using Form Helpers
One of the best things about working with templates in Rails is the presence of helpers. Rails comes with a bunch of helper methods for taking the tedium out of generating those bits of HTML that your views need. And let s face it, nothing is more of a drag to build than HTML forms. Fortunately, Rails understands the plight of the web developer all too well, and provides a suite of easy ways to build forms. Two basic varieties of form helpers are available: FormHelper: Active Record-aware tag helpers for creating forms that hook into models. FormTagHelper: Helpers that just output tags. They are not integrated with Active Record. The names of these helpers are suffixed with _tag. The FormHelper type is aware of Active Record objects assigned to the template; the FormTagHelper (note the Tag) type is not. The advantage of the Active Record-aware, FormHelper, helpers is that they know how to populate themselves with data and can automatically be highlighted in the event of validation errors from the model. But not every form element you ll make corresponds directly to a model attribute. That s where the FormTagHelper group comes in handy. These have no special relationship with Active Record; they just output form tags. In our registration form (Listing 6-3) we used four helpers: form_tag, text_field, password_field, and submit_tag. The form_tag helper is of the FormTagHelper variety. It simply creates an HTML form tag and places everything in the do..end block inside the resulting form. By default, forms use the HTTP POST method. If you want to use a different method, you need to specify it manually using the :method option (for example, :method => :get).
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