Databases
StackOverflow2013
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    <blockquote> <p>Validate and format it when the user exits the field. </p> </blockquote> <p>Yes. Provide noninvasive feedback to the user if validation or formatting rules fail. By noninasive I mean don't popup an alert or modal dialog box, thereby forcing the user to click something. Rather dynamically display a message adjacent or underneath the field where validation or formatting failed.</p> <blockquote> <p>Validate and format on every character entered. </p> </blockquote> <p>No. I think that hinders usability. Instead provide the user with a tooltip or some other hint as to what the formatting rules are or validation rules are. E.g. for a "required" field the practically ubiquitious asterisk, and for fields with formatting tell the user up front what the expected format is.</p> <blockquote> <p>Intercept keystrokes and prevent the user from entering characters that are wrong. </p> </blockquote> <p>If you are going to prevent the user from entering invalid characters, tell the user why you just blocked their input, noninvasively. Also,do not steal focus of the field. </p> <p>So for me the general principles are:</p> <ol> <li>Inform the user up front about your validation and formatting rules.</li> <li>Do not assume the user is sighted, so keep web accessiblity and screen readers in mind. (Unless you are developing a web site that has a limited target audience such as an Intranet.)</li> <li>Provide the user with noninvasive feedback, meaning do not make the user click on an alert box or modal dialog upon each failure.</li> <li>Make it obvious which input box failed validation or formatting rules, and tell the user why their input failed.</li> <li>Do not steal the mouse/pointer focus, when providing feedback.</li> <li>Keep tab order in mind, so that when keyboard oriented users complete a field, they can hit tab and go to the next logical input/selection field.</li> </ol>
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A row detail

Detail views are divided into sections. All the information in the data section comes from columns in the selected row. The other sections display data from other, related rows.

Related data can be related in a to-one or a to-many fashion. Captions of data related in a to-many fashion link to a list view showing a filtered view of the table.

Try moving around until you find a non-empty to-many entry and click on the label to get to one. You can move back to the root by clicking on the database name in the header.

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