How to Enable One Check Box While Disabling the Others

• Microsoft FoxPro for Windows, versions 2.5, 2.5a, and 2.5b
• Microsoft FoxPro for MS-DOS, versions 2.0, 2.5, 2.5a, and 2.5b
• Microsoft FoxPro for Macintosh, version 2.5b

SUMMARY

It is often desirable to enable one check box while disabling the others on a screen. By enabling only one check box and disabling the others, the color of the disabled ones will change and become dimmed. This will emphasize that only one of these check boxes can be selected at any given time.

See the procedure below for a demonstration of how to accomplish this.

MORE INFORMATION

Below are the steps to create the check boxes:

1. Open the Screen Builder and select the Check Box tool. (In FoxPro for MS-DOS, choose Check Box from the Screen menu.)

2. Create three check boxes on the screen with the first one having the variable check1, the second one having the variable check2, and the third one having the variable check3.

3. In the VALID clause of the first check box, type in this code:

         IF check1=1
            SHOW GET check2 DISABLED
            SHOW GET check3 DISABLED
         ELSE
            SHOW GET check2 ENABLED
            SHOW GET check3 ENABLED
         ENDIF
   
   

4. In the VALID clause of the second check box, type in this code:

         IF check2=1
            SHOW GET check1 DISABLED
            SHOW GET check3 DISABLED
         ELSE
            SHOW GET check1 ENABLED
            SHOW GET check3 ENABLED
         ENDIF
   
   

5. In the VALID clause of the third check box, type in this code:

         IF check3=1
            SHOW GET check1 DISABLED
            SHOW GET check2 DISABLED
         ELSE
            SHOW GET check1 ENABLED
            SHOW GET check2 ENABLED
         ENDIF
   
   

The variables check1, check2, and check3 will always have a value of 0 or 1. Therefore, when the variable is evaluated, this is how the IF statement is used enable or disable the check boxes.