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Bonus TIPS for Successful Posting

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Guide to Using Checkboxes

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  • Guide to Using Checkboxes

    This is in response to the whole 'how do i check if a checkbox is true' question.
    THe problem people have is they compare against the wrong type (ive done it myself).

    You would EXPECT a checkbox to return an L type - but I think there are certain events or times where it doesnt.
    Sometimes it returns "1" or "true" instead of .t. and "0"/"false" instead of .f.

    This makes the comparison fieldname==.t. lead to unexpected results in certain events/cases.

    So here you go world:
    Originally posted by Larsman View Post
    This isn't a very understandable "guide to using check boxes"
    Here is my guide. I use checkboxes no problem.

    FieldName: active
    Control Type:Checkbox
    Treat as Logical Field: Checked

    In other fields:
    Show hide Expression: active=0or1
    Enable Expression: active=0or1

    Comparison in Xbasic:
    convert_type(active,"L")==.t. <<Force a convert to L type (Failure to convert to L results in 0 which makes this statement false)
    convert_type(active,"N")==1 <<If the above fails (which it shouldnt, you can convert to N and compare against N)

    THe problem most people have is they're comparing against the wrong type
    for example:

    IF active==1 'if active is an L type, this may not evaluate properly
    IF active==.t. 'if active is a C type, this may not evaluate properly

    Using convert_type(active,"L") converts it to type L (boolean).
    So, you compare the converted type L to .t.|.f. (boolean operators)

    Interactive Window Mumbo Jumbo:
    = .T.
    = .F.
    = .T.
    = .F.
    = .T.
    = .F.
    = .F.
    ?convert_type("true","L")==.t.  CORRECT
    = .T.
    = .F.
    ?convert_type("false","L")==.t. CORRECT
    = .F.
    = .F.
    ?convert_type(1,"L")==.t. CORRECT
    = .T.
    = .F.
    = .F.
    dim myfield as C="true"
    = "C"
    = "L"
    ?myfield==.t.  'C to L comparison - WRONG!
    = .F.
    = "L"
    = .T.
    Moral of the story, dont compare apples to oranges.
    If you are comparing x against y make sure they're the same type and you wont get unexpected results.
    Scott Moniz - Computer Programmer/Analyst
    REA Inc.
    [email protected]

    REA INC offers consulting services, programming services, systems design, database design, third party payment gateway integration (CHASE, PAYPAL, AUTHORIZE.NET) and developer support.
    If you need custom code, or 1-to-1 mentoring in any facet of your database/web application design,
    contact us to discuss options.