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An input area is a data entry field. There are many variations on what an input area can look like; they can be as simple as a text entry field, and as complex as a multi-part entry field with text entry, value selectors, and buttons.
Characteristics
Details coming soon.
Visuals
Here you can see an assortment of input areas, suggesting a number of ways they can look.
Generic inputs
These are simple text entry boxes.
| Generic input: empty
 Here's a simple input box with no text in it; all you see inside is the placeholder text. | Generic input: filled
 Here, the generic input has some text entered into it. Note the presence of the "clear" button at the right end of the input field. | 
Inputs at the top of the view
These inputs are located at the top of the view (either at the very top of the screen, or immediately under a header).
| Top: emptyHere is a text entry field at the top of a page; this should be used under a header. | Top: active
 This text entry field from the top of a view is active; it has an active "Cancel" button next to it, and the "clear" button in the input field is visible. This style of input should be used without a header. Note: This needs further explaining; how is this different from the "empty" form in terms of header usage? | 
Inputs at the bottom of the view
These input areas are located at the bottom of the view.
| Empty text input box
 This input area at the bottom of a view includes a "Send" button (it's from an SMS app). Note that the "Send" button is disabled since the input is empty. | Filled text input box
 Now the bottom input box has some text in it, and the "Send" button is enabled. | 
| Multi-line text input box
 As the amount of text entered by the user grows, the input area at the bottom of a view expands upward to make room for more content, as seen here. | 
Simple fieldsets
These fieldsets include a combination of a value selector and a text input box. In this example, the value selector button is used to open a selector to choose the type of contact in a contacts app (work, home, etc), and the text input box is used to enter the corresponding email address.
| Empty
 Here, the text input box is empty, showing only the placeholder text. | With text entered
 Here, the user has entered an email address. There is a delete button next to the field, in this case, to allow deleting this email address from the contact record. 
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| With the value selector button pressed
 Here, the user has pressed the value selector button; when they let go of the screen, the value selector will open to let them choose the contact type. | Disabled, with undo button
 Here, the input area is disabled, but has an undo button. Note: Need to explain the use case for this. | 
Complex fieldsets
More complex fieldsets may include multiple text input fields, value selector buttons, and regular buttons.
| With content entered
 Here, we have an input area for which multiple text input values are associated with the "Home" category: a phone number, and a name. A button is included to add an address for this category. 
 | Disabled, with undo button
 In this example, the input area is disabled, and has an undo button. Note: Need to explain the use case for this. 
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Interaction
Here, you can see a series of interactions used to create a new calendar entry.












