The screen manager detects and reports on many different types of errors and error conditions. The basic premise used throughout the error handling is to assist the user in correcting mistakes with the least amount of effort. Data entered incorrectly is not discarded. The erroneous portions are highlighted and brought to the attention of the user.
When extended attribute support is available, it is possible to highlight one or more individual characters within a field. When extended attribute support is not available, standard field-level processing is used.
The cursor is positioned on the first erroneous character of the first erroneous field when the screen is displayed again. Any error message displayed applies only to the first field in error.
Any field can have from zero to “n” characters (where “n” is the length of the field) flagged as errors. When extended attributes are supported, each erroneous character is displayed using the merged normal and error characteristics. Characters that are not in error are displayed using the normal characteristics for color and highlighting. When extended attributes are not supported, the entire field is displayed using the error characteristics.
Each field has normal and error display characteristics.
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