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Mobile Input Field

A checklist of essential usability requirements when you design an input field for use on mobile devices.

References:

Relation
Done
Priority
Task
Need
Is this field absolutely necessary?
Description
Is the label above it? (Not inside, not below)
Is the field marked as required (*) or optional?
Have you removed any placeholder from inside the field?
Visibility
Is the field big enough so that most possible field values are visible?
Is the field visible in both orientations when the keyboard is displayed?
Filling it in for the user
Do you have any good defaults for this field?
Any history available?
Frequently used values?
Can you use the phone features (camera, GPS, voice, contacts ) to populate it?
Can you compute it for the user based on other info (e.g., state based on zip code, coupon field)?
Typing
Do you support copy & paste into the field?
What is the right keyboard for this field?
Can you make suggestions/autocomplete based on the first letters typed?
Do not autocorrect for names, addresses and email addresses.
Do you allow typos or abbreviations?
Do you allow users to enter it in whatever format they like? (e.g., phone numbers credit cards)
You can autoformat it for them.

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