how to create qr code in vb.net Part 1: Part Title in Visual Studio .NET

Creating Code 128 in Visual Studio .NET Part 1: Part Title

Part 1: Part Title
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Building Data Access Pages current value of the DepartmentID field. The code then adds 1 to the value and stores it back in the DepartmentID field before the MSODSC saves the record.
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Setting a Cookie and Opening a Related Web Page
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One of the most common tasks you re likely to automate in an Access application is to open a related form based on the value in a field of the record currently displayed. For example, you might want to review employee data in the Housing Reservations database and then open related reservation requests in another window for the current employee. The best way to accomplish this same task in a data access page is to write a cookie from one page containing the linking information and then use that information when a second page opens to filter or navigate to the related information. A cookie is a small file that your Web browser can write to memory or to the user s hard drive to pass information from one page to another. In the Housing Reservations sample database (Housing.mdb), you can find several sample data access pages that use this technique to pass filtering information. The bad news is cookies don t work when you open a data access page from within Access. To test the sample pages, you must open them in Internet Explorer. To see these techniques in action, go to the Webs\DataAccessPages subfolder in the sample files and open the file default.htm in your browser. This page lets you choose an employee name, enter a password, and click the Sign On button, as shown in Figure 27-52.
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Figure 27-52. A root page for a Web site that lets employees sign on and view information.
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This page is intended to be the root sign-on page for a Web site that lets employees view their own employee record, review confirmed reservations, and enter new reservation requests. When you enter a correct password for an employee and click Sign On, code in the control s 1075
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Part 6: Linking Access and the Web
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F27QQ52
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Part 1: Part Title
Microsoft Office Access 2003 Inside Out Click event writes a cookie and opens the dapXmplEmployees data access page. The code is as follows:
<SCRIPT language=vbscript event=onclick for=cmdSignOn> Dim lngEmpnum Dim rs Dim strPswd Make sure they picked an employee If len(ddlEmployees.value) = 0 Then MsgBox "You must select an employee!" Exit Sub End If Test if no password is entered If Len(txtPassword.value) = 0 then MsgBox "Please enter a password!" Exit Sub End If Grab the employee number lngEmpNum = ddlEmployees.value Get a copy of the bound recordset (qryEmployeeSignon) Set rs = MSODSC.DataPages(0).Recordset.Clone rs.Find "EmployeeNumber = " & lngEmpNum If Not ((rs.EOF) or (rs.BOF)) Then strPswd = rs("Password") Else msgbox "Unable to locate the employee record you selected." Exit Sub End If If passwords don t match If Lcase(txtPassword.value) <> Lcase(strPswd) then MsgBox "Incorrect Password!" If Len(txtCount.value) = 0 Then txtCount.value = 1 Else txtCount.value = txtCount.value + 1 End If If txtCount.value > 2 Then MsgBox "You have entered an incorrect password " & _ "three times. Goodbye." window.close End If
Part 6: Linking Access and the Web
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Part 1: Part Title
Building Data Access Pages
Else Cookies don t work inside Access If window.location.protocol = "accdp:" Then MsgBox "Password is valid, but you cannot sign on " & _ "from within Access." & _ " Run this page in a Web browser instead." Exit Sub End If Open the new page in the current window Document.cookie = "Logon=True" Document.cookie = "EmpNum=" & lngEmpNum window.open "dapXmplEmployees.htm","_self" Alternate method: window.navigate("dapXmplEmployees.htm") End If </SCRIPT>
The last part of the code assigns two keyword values (called crumbs) to the current document cookie. Any page can reference the cookie property that contains a string of keywords and assigned values, separated by semicolons. So, a page can search the cookie string to verify that the Logon crumb is true and then fetch the value assigned to the EmpNum crumb to use in filtering. When you set a cookie value, you can also set an expiration date and time by adding the expires keyword. If this were a production application, this code should probably set an expiration time of 20 or 30 minutes so that the user must log on again after the cookie expires. It should also check to see if the user is an application administrator or department manager and set additional crumbs that subsequent pages can examine to restrict what the user can do. Note
To clear a crumb, set its value to Null with an expiration date in the past, like this:
Document.cookie = "Logon=NULL;expires=Saturday, 01-Jan-00 00:00:00 GMT"
Finally, the code uses the open method of the window object to open the employees data access page in the same window (_self). As noted in the commented code, an alternative method is to use the navigate method of the window object. When this code executes, the dapXmplEmployees data access page opens and displays the record for the user who signed on, as shown in Figure 27-53 on the next page.
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