I am trying to do a input Item Code Validation consist of 3 digi. e.g. '001', however, because I want it to be a fixed 3 digi, it has to be either text or string. which integer validation won't be able to apply in this case: e.g. if 'edit1.text < 1 or > 201 then showmessage.'Valid'; I figured out doing a string validation would be unclever too, so it is possible to convert the string into integer, then perform an validtion.

Hi, please use the TMaskEdit VCL to check user input data. As this example, set the EditMask property with 000;1;_ to perform the input validation.

Can u explain the use of that futher? I am not familiar with this component thnx

引言: Can u explain the use of that futher? I am not familiar with this component thnx

Sometimes we want to constrain the input data, we use this VCL. Here is the description of MaskEdit: Use a TMaskEdit object to put a masked edit control on your form. Masked edit controls validate the text the user enters against a mask that encodes the valid forms the text can take. The mask can also format text that is displayed to the user. The most important property of MaskEdit is EditMask. Here is the common Characters meaning in EditMask property: L -----The L character requires an alphabetic character only in this position. For the US, this is A-Z, a-z. l -----The l character permits only an alphabetic character in this position, but doesn't require it. A -----The A character requires an alphanumeric character only in this position. For the US, this is A-Z, a-z, 0-9. a -----The a character permits an alphanumeric character in this position, but doesn't require it. C -----The C character requires an arbitrary character in this position. c -----The c character permits an arbitrary character in this position, but doesn't require it. 0 -----The 0 character requires a numeric character only in this position. 9 -----The 9 character permits a numeric character in this position, but doesn't require it. Just look up the on-line help, you can find more important information about this component.

so I just set mask property as: 000;1;_ then put my validation code inside the maskedit then I am done?

引言: so I just set mask property as: 000;1;_ then put my validation code inside the maskedit then I am done?

Just set the EditMask property. And you have not to put any validation code into this component. It will validate the input with the EditMask property automaticlly.