WebFormFieldOrColumn.getDisplayType

Returns the field's display type. Display type will be one of the following:

Basic Types:

• CHECKBOX
• LABEL
• PASSWORD
• RADIO
• SELECT
• TEXT
• TEXTAREA

HTML5 Types:

• COLOR
• DATE
• DATETIME-LOCAL
• EMAIL
• MONTH
• NUMBER
• RANGE
• SEARCH
• TEL
• TIME
• URL
• WEEK

Further documentation.