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Building Web Applications
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FIGURE 11-13
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The Record Update Form dialog box gives you a ready-made Web app for updating the content of a database record
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Dreamweaver provides server behaviors for restricting visitor access to certain areas of your site and creating login and logout procedures These behaviors work in ColdFusion, ASP, and JSP sites but not in ASPNET or PHP sites
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If your site has a user database, you can add login and logout functionality with the Log In User and Log Out User server behaviors To insert the Log In User behavior, first create a login page with a form that contains fields for user name and password, plus a Submit button Then go to the Server Behaviors panel, click the plus button, and choose User Authentication | Log In User The Log In User dialog box appears, as shown in Figure 11-14 Choose the login form from the Get Input From Form list Then specify the fields that contain the user name and password from the Username Field and Password Field lists Choose the user database from the Validate Using Data Source list and select
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FIGURE 11-14
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the appropriate database table from the Table list Then choose the column of the table that contains user names and the column that contains passwords from the Username Column and Password Column lists Don t forget to supply your app server s user name and password in the Data Source Username and Data Source Password fields, if required Click the Browse button next to the If Login Succeeds, Go To field and choose the appropriate page If you want to send the visitor back to the page that called the login page, check the Go To Previous URL (If It Exists) option Choose a page to load if login fails by clicking the second Browse button Under Restrict Access Based On, determine the conditions for successful login If user name and password are sufficient, select the Username And Password option If you want to require a specific access level in addition to user name and password, select the second option, and choose the table column that contains the visitor s access level from the Get Level From list See the next section for more information about access levels
11:
Building Web Applications
FROM THE CLASSROOM
Search functions are standard fare on the Web The visitor expects them You can add a simple search feature to display matching results from a database with a few quick steps
Building a Search Function
Search functions usually consist of two pages: the search page, which contains the search form, and the results page, which displays the results Design both pages in Dreamweaver Add a form to the search page with a text field and a Submit button Give the text field a name and make a note of it you ll use this name on the results page Set the method of the form to get or post get is more common for search functions, but post is more secure Interestingly enough, the results page is the page that actually performs the search The first step is to add a recordset to the results page In the Recordset dialog box, select the database and database table that you want to search If you want to display all the columns of the database table in your results list, choose the All option under Columns If you want to display only particular columns, choose the Selected option and choose the desired columns from the list The recordset filter is the workhorse The filter decides which records in the database are matches From the first drop-down list under Filter, choose the column that you want to test for matches From the second drop-down list, choose Contains This expression allows the visitor to type in partial search strings like te, returning results for teeth, coyote, miter, and so on From the third drop-down list, select URL Parameter if you used a get method form or Form Parameter if you used a post method form Finally, in the text box to the right, type the name of the text field from the search page The filter now uses the visitor s search string to scour the database table Click OK to create the recordset Now simply add a dynamic table to the results page to display the contents of the recordset For a touch of class, create a new URL variable or form variable, depending on the type of form you built on the search page Set the value of this variable to the name of the text field, just like you did in the recordset Drag the variable from the Bindings panel into the document window, and add a message like Your search for the keyword x returned the following results
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