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The for loop is a convenient way of executing some code a specific number of times. In that sense, it s similar to the while loop. In a way, the for loop is just a reformulation of the while loop we ve already used. If we look at our while loop example, we can formulate it in full like this: initialize; while (condition) { statements; increment; } The for loop simply reformulates that as follows: for (initial condition; test condition; alter condition) { statements; } This is generally a cleaner way of executing loops. Everything relevant to the loop is contained within the parentheses of the for statement. If we reformulate our while loop example, this is how it looks: for (var count = 1; count < 11; count++ ) { alert (count); } Everything related to the loop is contained within the parentheses. Now we can put code between the curly braces, secure in the knowledge that the code will be executed exactly ten times. One of the most common uses of the for loop is to act on every element of an array. This is achieved using array.length, which provides the number of elements. It's important to remember that the index of the array begins at 0, not 1. In the following example, the array has four elements. The count variable increases from 0 once for every element in the array. When count reaches 4, the test condition fails and the loop ends, leaving 3 as the last index that was retrieved from the array: var beatles = Array("John","Paul","George","Ringo"); for (var count = 0 ; count < beatles.length; count++ ) { alert(beatles[count]); } If you run this code, you will see four alert messages, one for each Beatle.

Status Customer Groups Vendor Groups Sales Districts Segments Subsegments Responsibilities Business Sectors

BASIC COURSE: The system displays the Login page. The user enters the username and password, and then clicks Login. The system checks the syntax of the password, finds the user s account in the master account list, verifies that the password is correct, and starts a session. ALTERNATE COURSES: Improperly formatted password: System displays Invalid login credentials message to user. Account not found, or password incorrect: System displays Invalid login credentials message. User clicks Cancel: System closes the Login page.

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Once data is set up you can begin to enter your business relations by opening the appropriate form, shown in Figure 12-3 (CRM Business Relations). By default, when you open the form the data displayed will be filtered by the business relations where the Main Contact listed is the logged-in employee. Clicking the Show All check box on the top left will display all business relations. It is possible to further filter the displayed information by using the Employee, Type, and Name filter fields at the top of this form. These filters can be very helpful for businesses that might have many thousands of business relations. You will see similar filtering on most forms within the CRM modules.

If you want to reuse the same piece of code more than once, you can wrap the statements up inside a function. A function is a group of statements that can be invoked from anywhere in your code. Functions are, in effect, miniature scripts. It s good practice to define your functions before you invoke them. A simple function might look like this: function shout() { var beatles = Array("John","Paul","George","Ringo"); for (var count = 0 ; count < beatles.length; count++ ) { alert(beatles[count]); } }

The process for writing a use case of this form is a simple one. First, to identify the Basic Course, ask, what happens (and then what happens, and then what happens ) Second, to identify the first Alternate Course, ask, what else happens (and how do we deal with that when it happens) And then keep on asking, what else happens until you can t think of any more Alternate Courses. The key here is to think of as many rainy day scenarios, or even just different ways the user might want to interact with the system, and make sure they re all recorded. This way, they won t be forgotten about when you move on to the design.1

Note If you try to open the Business Relations form and you receive an error saying No employee is

mapped to the current user, this means either that you did not follow our instructions in the Employee section of 6, or that you don t have the Human Resources module. If the former applies to you, open the Employee form (Basic Employee) and go back to 6.

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