Simple .NET/ASP.NET PDF document editor web control SDK

All the items from the entries table are obtained through the Entry model as Entry objects and placed into an array assigned to @entries, which is then passed through to the associated view app/views/entries/view_all.rhtml which contains this code:

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The following is an example of how this class may be used, both with and without muffling: >>> calculator = MuffledCalculator() >>> calculator.calc('10/2') 5 >>> calculator.calc('10/0') # No muffling Traceback (most recent call last): File "<stdin>", line 1, in File "MuffledCalculator.py", line 6, in calc return eval(expr) File "<string>", line 0, in ZeroDivisionError: integer division or modulo by zero >>> calculator.muffled = 1 >>> calculator.calc('10/0') Division by zero is illegal As you can see, when the calculator is not muffled, the ZeroDivisionError is caught but passed on.

On the Slide Master tab, in the Master Layout group, clear the Footers check box, and then click Insert Placeholder, click Picture, and drag a rectangle to ll the entire right half of the slide. Next, on the Insert tab, in the Illustrations group, click Shapes. Click Rectangle, and drag a rectangle to ll the entire left half of the slide. Right-click the rectangle, and specify a ll color in this example, black. Hold down the Shift key as you select both the rectangle and placeholder, right-click, and then click Send To Back. Select the title area, and drag it down and to the center of the rectangle on the left, using the resizing handles as needed. Change the text in the title area to read

<% @entries.each do |entry| %> <h1><%= link_to entry.title, :action => 'show', :id => entry.id %></h1> <p><%= entry.content %></p> <p><em>Posted at <%= entry.created_at %></em></p> <% end %> <%= link_to 'Add New entry', :controller => 'entries', :action => 'new' %>

The first line starts by using the each method on the @entries array to iterate through each element and place each constituent entry into the entry local variable. Within the loop, you show the entry s title (from entry.title) within an <h1> HTML heading, and then the entry s content and creation date. Once the loop is over, all the entries from the database have been rendered, and finally you render a link to the new action of the entries controller so that the user can post new entries to the system.

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In the last section you created an action and view to show all the diary entries in your system on a single blog-like Web page. Within your view_all view was this line:

If you run the program from the previous section again and enter a nonnumeric value at the prompt, another exception occurs: Enter the first number: 10 Enter the second number: "Hello, world!" Traceback (most recent call last): File "exceptions.py", line 4, in print x/y TypeError: unsupported operand type(s) for /: 'int' and 'str' Because the except clause only looked for ZeroDivisionError exceptions, this one slipped through and halted the program. To catch this as well, you can simply add another except clause to the same try/except statement: try: x = input('Enter the first number: ') y = input('Enter the second number: ') print x/y except ZeroDivisionError: print "The second number can't be zero!" except TypeError: print "That wasn't a number, was it " This time using an if statement would be more difficult. How do you check whether a value can be used in division There are a number of ways, but by far the best way is, in fact, to simply divide the values to see if it works. Also notice how the exception handling doesn t clutter the original code; adding lots of if statements to check for possible error conditions could easily have made the code quite unreadable.

This line creates a heading that contains a link to the show action for that entry and would render into final HTML like this:

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If you were to click the link, you would be redirected to the show action for the entries controller, and an ID of 1 would be passed through. Let s look at what the show action does with this: