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The self keyword is similar to this in Java code The x and y variables in the example are named selfx and selfy in the initializer, that means that they will be available for use throughout the entire class While working with code within the object, you can refer to these variables as selfx and selfy If you create the object and assign a name to it such as obj1, then you can refer to these same variables as obj1x and obj1y As you can see, the class is called by passing the values 7 and 8 to it These values are then assigned to x and y within the class initializer method We assign the class object to an identifier that we call obj1 The obj1 identifier now holds a reference to my_object() with the values we ve passed it.

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Ajax-style applications need to provide visual cues to users to tell them what s happening to the content. While documents are loading, code can display a loading message. You saw this in the earlier examples. In the examples, the code only tested for a readyState value of 4. You could have tested for the other values and displayed an appropriate response for each state. You can highlight new or changed information by using different CSS styling. You saw this in Figure 9-5 earlier in the chapter, where a validation error message displayed in red. I achieved this using the invalid class: .invalid { padding: 5px; color: #FF0000; } I also applied the validation after entering the field details and before submitting the form to the server. Traditional web applications tend to validate all fields after the form is completed, but before it is submitted. In the case of a long form, this means that users can experience quite a delay before receiving feedback. In traditional web applications, the alert box provides validation feedback to users. Unfortunately, alert boxes interrupt users and require them to click a button before proceeding. The appearance is fixed because alert boxes can t accept styling. Showing validation text in a <div> element provides a more elegant solution and doesn t interrupt the users flow through the form.

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With the query in Listing 7-6, we will now get just one row for Barbara in the union. This will, of course, depend on her name being spelled the same in both clubs. And what if there are actually two different people named Barbara Olson Sadly, real data is fraught with these sorts of problems, and there is little you can do other than be aware of them.

The obj1 identifier can now be used to call methods and functions that are defined within the class For more information on classes, please see 6, which covers object orientation in Python Classes are very powerful and the fundamental building blocks for making larger programs..

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End Sub </script> <html> <head> <link href="styles.css" type="text/css" rel="stylesheet" /> </head> <body> <h1>Add New DVD</h1> <form runat="server"> <asp:Label id="lblMessage" runat="server" forecolor="Blue"></asp:Label> <table> <tr> <td class="emphasis"> <asp:Label id="lblTitle" runat="server" text="Label">Title:</asp:Label> </td> <td> <asp:TextBox id="txtTitle" runat="server" Width="200px"></asp:TextBox> <asp:RequiredFieldValidator id="val1" runat="server" ErrorMessage="Please enter a title" Display="Dynamic" ControlToValidate="txtTitle"></asp:RequiredFieldValidator> </td> </tr> <tr> <td class="emphasis"> <asp:Label id="lblFormat" runat="server" text="Label">Format:</asp:Label> </td> <td> <asp:TextBox id="txtFormat" runat="server" Width="200px"></asp:TextBox> <asp:RequiredFieldValidator id="RequiredFieldValidator2" runat="server" ErrorMessage="Please enter a format" Display="Dynamic" ControlToValidate="txtFormat"></asp:RequiredFieldValidator> </td> </tr> <tr> <td class="emphasis"> <asp:Label id="lblGenre" runat="server" text="Label">Genre:</asp:Label> </td> <td> <asp:TextBox id="txtGenre" runat="server" Width="200px"></asp:TextBox> <asp:RequiredFieldValidator id="RequiredFieldValidator3" runat="server" ErrorMessage="Please enter a title" Display="Dynamic" ControlToValidate="txtGenre"></asp:RequiredFieldValidator> </td> </tr> <tr> <td class="emphasis" colspan="2"> <asp:Button id="btnAdd" onclick="btnAdd_Click" runat="server"

One particular snag that seems to catch every Jython programmer is when you use default values in a method signature. Listing 6-26. >>> ... ... ... ... >>> >>> [1] >>> [1, >>> [1, class Tricky(object): def mutate(self, x=[]): x.append(1) return x obj = Tricky() obj.mutate() obj.mutate() 1] obj.mutate() 1, 1]

The main use for union is combining data from two or more tables, as we have been doing in the previous sections. For example, if data for different months had been stored in separate tables (not necessarily a great design decision!), you could use several union operations to combine the data for the whole year. It is also possible to combine two sets of rows from the one table. Say we wanted to find the IDs of all the people who have entered either tournament 24 or tournament 40 from the Entry table in Figure 7-7.

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