Running the JavaScript debugger

The JavaScript debugger runs automatically when JavaScript code is encountered. You control the debugger from the Domino® Designer debug interface.

1. Insert debugger statements in the JavaScript code as desired. In debug mode, this statement stops execution the same as a breakpoint. In non-debug mode, this statement has no effect.
   Note: Use debugger statements only in code that runs on a server with IBM® Domino 9.0 Social Edition or greater. The debugger statement does not work on earlier versions of Domino and may cause problems.
2. Open or preview the XPage containing the JavaScript code and activate the design element that causes the code to run. If Stop at first line of server-side JavaScript is in effect, the code stops at the beginning of the first JavaScript section. Otherwise the code stops at the first breakpoint. If nothing is set, the code executes without stopping.
3. Go to the Eclipse debug interface. The following views reflect the state of the run-time where it is stopped:
   • The debug view shows the current stack frame, including the Java stack.
   • The editor view shows the code being executed. An arrow on the left points to the current line. You can edit the code, but you must reactivate the target design element to have the code take effect.
   • The variable view shows the names and current values of variables in the current code.
4. Continue execution using the debug controls. Click the Resume toolbar button to resume execution and stop at the next breakpoint. Click Step Into, Step Over, and other toolbar buttons for alternate actions.
5. Set and manage breakpoints in the XPages Source editor as follows:
   1. Double-click in the left column of a line of code to set a breakpoint. A blue circle appears in the column. Be sure that the line of code is executable. Otherwise the breakpoint is not effective.
   2. Double-click in the left column of a line of code containing a breakpoint to clear the breakpoint.
   3. Right-click in the left column of a line of code containing a breakpoint to set, clear, enable, or disable the breakpoint, or to adjust its properties.
   4. To make a breakpoint conditional, right-click in the left column of the line of code containing the breakpoint and select Breakpoint Properties. In the Properties for dialog, select Enable condition and enter a script that returns true or false. Take care that the JavaScript is correct as no validation occurs.

Example

The following code is for a server-side click event for a button:

var s = "hello world";
var n = 0;
debugger
while (n < 3) {
	n++;
	debugger
}
var db = session.getCurrentDatabase();
var title = db.getTitle();
debugger
requestScope.status = "All done"

The execution sequence in debug mode is as follows:

1. You open the containing XPage on the run-time server and click the button that starts the JavaScript code. The debugger stops at the first debugger statement. The variable s has the value hello world. The variable n has the value 0.
2. You click the Resume toolbar button. The debugger stops at the second debugger statement. The variable n has the value 1.
3. You click the Resume toolbar button. The debugger again stops at the second debugger statement. The variable n has the value 2.
4. You click the Resume toolbar button. The debugger again stops at the second debugger statement. The variable n has the value 3.
5. You click the Resume toolbar button. The debugger stops at the third debugger statement. The variables db and title are defined. The variable db is an object that can be expanded.
6. You click the Resume toolbar button. The code completes and the debugger exits.

The following picture illustrates the Eclipse debug interface when execution is at the last debugger statement: