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Web Form Design by Luke Wroblewski

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Chapter 9

Inline Validation

Confirmation

Suggestions

Limits

Best Practices

Despite our best efforts to format questions clearly and provide meaningful affordances for our inputs, some of our questions will always have more than one possible answer. In these cases, direct feedback can help reassure people that their answers are valid. This type of real-time communication is often implemented as inline validation.

Inline validation can provide several types of feedback: confirmation that an appropriate answer was given, suggestions for valid answers, and real-time updates designed to help people stay within necessary limits. These bits of feedback usually happen when people begin, continue, or stop entering answers within input fields. ...

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