The input box in Java

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The input box
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CHAPTER 7 Making Choices If and Select Case Control Structures
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Figure 7-2
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Modal Open dialog box
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Not all forms are modal For example, the Find form in Notepad, shown in Figure 7-3 and displayed with the Edit | Find menu command, is modeless, in that the application user can edit text in the main application without having to close the Find form 10 discusses modal dialog forms in more detail
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Figure 7-3
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Modeless Find form
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Visual Basic 2005 Demysti ed
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Displaying an Input Box
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The input box is a form, but one built into Visual Basic, so you do not have to design it Instead, you display it by calling the InputBox function The syntax of the InputBox function is shown here:
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InputBox( [Prompt], [Title], [Default Value])
Table 7-1 lists the parameters of the InputBox function The following code displays the input box shown in Figure 7-1 with a prompt for the application user to enter their name Only the first, required parameter is used
InputBox("Enter your name:")
Return Value
Choosing the OK button does more than close the input box and permit the application user to return to the main form Choosing the OK button also returns a value of the String data type, the text the user entered in the input box The effect of returning a value is illustrated by the following code If the user typed George in the input box and chose the OK button, the value George would be assigned to strName Thus, the output of the DebugWriteLine statement would be George
Dim strName As String strName = InputBox("Enter your name: ") DebugWriteLine(strName) 'outputs George
Name Prompt Title
Required Yes No
Purpose The text informing the user what to enter, such as Enter your name: in Figure 7-1 The title of the input box If this is omitted, the name of the project is used as the title, as in Figure 7-1 The value displayed in the input box when it is rst displayed If this is omitted, nothing (an empty string) is displayed, as in Figure 7-1
Default Value
Table 7-1
Parameters of the InputBox Function
CHAPTER 7 Making Choices If and Select Case Control Structures
Similarly, choosing the Cancel button does more than close the input box and permit the application user to return to the main form Choosing the Cancel button also returns a value of the String data type, this time an empty string An empty string has the value (two double quotes) because a string always is enclosed in double quotes, and there s nothing in between the two double quotes because the string is empty Thus, in the preceding code, if the user chose the Cancel button, regardless of what they had entered in the input box, the value assigned to strName would be an empty string, and nothing would be output by the DebugWriteLine statement The concept of returning a value works quite similarly to the previous examples of assignment statements In an assignment statement, the value on the right side of the assignment operator is assigned to the variable or property on the left side of the assignment operator Similarly, the value returned by a function on the right side of the assignment operator is assigned to the variable or property on the left side of the assignment operator In the preceding code example, the left side of the assignment statement was a String variable, but it also may be a property whose data type is String The following code snippet assumes a Label control named lblName, whose Text property is assigned the text input by the user in the input box:
lblNameText = InputBox("Enter your name: ")
If Control Structure
The If control structure comes in three varieties, depending on the number of alternative blocks of code: You use the IfThen statement if you want a block of code to execute if a condition is True but no block of code to execute if the condition is False For example, if a purchaser is eligible for a senior citizen discount, you adjust the price, but if not, there is no price change to make You use the IfThenElse statement if you want one block of code to execute if a condition is True, and a second, different block of code to execute if the condition is False This code structure often is used when there are two alternatives, such as Yes or No, or Male or Female
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