ASP.NET Web PDF Document Viewer/Editor Control Library

This code is simple for what it does. It relies on a method provided by Rails called paginate that provides items from a particular model (in this case, entries) in groups of ten (in this instance). The reason for pagination is because if your system contained 1,000 entries, showing them all on one page would be cumbersome. However, the paginate method returns entries in groups of ten and recognizes a page variable passed from the Web browser (via the URL) so that the correct group of ten entries is shown. However, you could rewrite the list method to load all the entries like so:

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The category heading offers little information and forces the viewer to keep searching for the main point.

def list @entries = Entry.find(:all) end Entry is the model class, and models inherit from ActiveRecord::Base, which provides methods suitable to navigate and find data in the associated table for that model. Therefore, Entry.find(:all) returns all rows (as objects) from the entries table and places them as an array into @entries.

Now let s look at the equivalent view for the list controller action examined in the previous section. The view template is located in app/views/entries/list.rhtml:

The root class for all exceptions Raised when attribute reference or assignment fails Raised when trying to open a nonexistent file (among other things) Raised when using a nonexistent index on a sequence Raised when using a nonexistent key on a mapping Raised when a name (variable) is not found Raised when the code is ill-formed Raised when a built-in operation or function is applied to an object of the wrong type Raised when a built-in operation or function is applied to an object with correct type, but with an inappropriate value Raised when the second argument of a division or modulo operation is zero

FIGURE 2-20 The conventional PowerPoint approach does not help working memory to select the most important information.

<h1>Listing entries</h1> <table> <tr> <% for column in Entry.content_columns %> <th><%= column.human_name %></th> <% end %> </tr> <% for entry in @entries %> <tr> <% for column in Entry.content_columns %> <td><%=h entry.send(column.name) %></td> <% end %> <td><%= link_to 'Show', :action => 'show', :id => entry %></td> <td><%= link_to 'Edit', :action => 'edit', :id => entry %></td> <td><%= link_to 'Destroy', { :action => 'destroy', :id => entry }, :confirm => 'Are you sure ', :post => true %></td> </tr> <% end %> </table>

<%= link_to 'Previous page', { :page => @entry_pages.current.previous } if @entry_pages.current.previous %> <%= link_to 'Next page', { :page => @entry_pages.current.next } if @entry_pages.current.next %> <br /> <%= link_to 'New entry', :action => 'new' %>

If you grew up writing essays and reports on paper or as Microsoft Of ce Word documents, it s a natural transition to think of a PowerPoint slide as a piece of paper where you can start writing out your thoughts. But one of the fundamental assumptions about a piece of paper is that it can stand alone a presenter normally does not need to be there to explain it. The only problem is that this example PowerPoint slide is accompanied by the narration of a live presenter yet the slide does not take that fact into account. Another problem with thinking of the slide area as a piece of paper is that you are much more likely to ll it with text instead of a graphic. Although text on a screen is initially processed through the visual channel, it is quickly verbalized and sent through the verbal

If you re familiar with both Ruby and HTML, you ll note that this view is, basically, HTML with Ruby embedded in it (with the Ruby located between <% and %> tags).

The first dynamic section of the preceding view looks like this: