New Perspectives on XML

1

• Tutorial 2.2
• Data Binding with Element Attributes

2
Binding to an XML Attribute

• Attributes, like the Status attribute of the
  Employee element, are treated by the DSO as
  fields. If the attribute is part of a record
  element, it is easy to bind attribute values to a
  Web page.

3
Binding to an XML Attribute

• This code has the ID attribute as part of the
  Employee element
• ltEmployee IDE304gt
• ltNamegtAlice Ashmanlt/Namegt
• ltDepartmentgtAccountinglt/Departmentgt
• lt/Employeegt

4
Binding to an XML Attribute

• And it is interpreted by the DSO as
• ltEmployeegt
• ltIDgtE304lt/IDgt
• ltNamegtAlice Ashmanlt/Namegt
• ltDepartmentgtAccountinglt/Departmentgt
• lt/Employee
• If the attribute is part of a field element, it
  is still treated by the DSO as a field element.

5
Binding to an XML Attribute

• The field element containing the attribute
  becomes a record element.
• Remember to reference all character data within
  an element using the Text field.
• It is a good idea not to use attributes in field
  elements if you plan to do data binding.

6
Binding to an XML Attribute

• This figure shows STAFF_INFO data displayed in
  the Web page

bound element
bound element
7
The Data Source Object

• ActiveX Data Objects (ADO) is a data-access
  technology developed by Microsoft. ADO allows you
  to work with the Data Source Object by applying a
  method or by changing one of the properties of
  the DSO.
• The syntax for applying a method is
• id.recordset.method

8
The Data Source Object

• Here, id is the name of the data island in the
  Web document and method is the name of the method
  supported by ADO.
• There are several methods that can be applied to
  DSOs.

9
The Data Source Object

• This figure shows a few available recordset
  methods

10
The Data Source Object

• For example, if you want to display the last
  record in a DSO whose id is Staff_Info, run the
  following method
• Staff_Info.recordset.moveLast( )
• The simplest way to run a method is to assign the
  method to the onClick event handler of a ltbuttongt
  as shown below
• ltbutton onClickStaff_Info.recordset.moveLast(
  )gt

11
The Data Source Object

• When the user clicks the button, IE runs the
  command indicated by the onClick event handler,
  displaying the last record.

12
Assigning a Recordset Method

• This figure shows how to enter the movefirst( )
  method

13
Assigning a Recordset Method Continued

• This figure shows how to enter the remaining
  recordset methods