Mastering Web Site Development/Microsoft Mastering Web Site Development (Microsoft) (1997).iso/Media/Ch05/W05D070.cc2

Text File | 1997-04-24 | 3.5 KB | 65 lines

0, In this demonstration, you will see how to use the
4, Microsoft Script Debugger. After you've installed
7, the Microsoft Script Debugger there are two
9, situations where you will use it. First, when you view
13, the source of an HTML page the page is displayed
16, with the Script Debugger. For example, this is a
20, page with three frames on it. I can enter values into
23, the text boxes on two of the frames and when I
28, click the button on the third frame it reads the
31, values from the two text boxes. If there was an error
35, in the code I could view the source of this file,
42, and the source of the page displays in the
45, Microsoft Script Debugger. This is the source for the
48, page frameparent.htm. It contains the source file
53, for the frames displayed on the page. Using the
57, Script Debugger is especially useful for frames
60, because the Project Explorer Window displays the
63, hierarchy of the pages displayed in the frames. To look at
68, the code for one of the pages, I can simply
71, double-click on the page. This is the code for the frame
75, that contains the command button. I can set a
78, break point at one of the lines of code by simply
82, clicking in the margin. In order to reach this break
86, point, I need to return to Internet Explorer and
89, hit the button again. Back in Internet Explorer, if
95, I hit the button the break point is reached and
100, the Microsoft Script Debugger opens the file with
103, the line highlighted that caused the break point.
107, Once in break mode the Microsoft Script Debugger
110, works like other debuggers you may be familiar with.
113, There are buttons that will jump you into lines of
115, code, step you over lines of code, and step you
119, out of lines of code. There's an Immediate Window
122, where you can output the values of variables that
126, you're using in your code. For example, we can
130, output the value of the text box and see that it is
135, "3456." To continue on after you've debugged your
139, code simply hit the Continue button. Another use for
147, the Script Debugger is finding run-time or
149, syntax errors in your script code. If you open a page
153, that contains syntax errors, for example,
158, "errorpage.htm." This is a page that contains a text box
164, and a push button. When I click on the push button
167, it should change the value displayed in the text
170, box. However, there's errors in this code so when I
174, click on the push button you get the regular
177, Internet Explorer Script Error dialog. But when you
180, select OK the Microsoft Script Debugger starts
185, loading the page and has the cursor at the line that
189, caused the error. The error in this case is that I
195, tried to access the value of a control using the
199, Forms Collection when the control itself did not live
203, on a form. In the Microsoft Script Debugger you
207, are simply looking at a local copy of this HTML
210, page, so you can't delete or change the text. You
215, have to return to the actual page on the Web server.
219, If I tried to delete this text the Microsoft
222, Script Debugger displays an error saying that the file
225, is actually stored on an HTTP server and so you
229, can't edit the file directly. So, in this
234, demonstration you have seen that the Microsoft Script
237, Debugger is useful for viewing your code and setting
240, break points, as well as finding errors in your
243, script code.
244, END