Prevent Duplicate Values with Field Settings
An easy way to prevent users from entering the same values in a Kintone App is to use the Prohibit duplicate values setting.
Fields with Prohibit duplicate values setting
The following fields support this native feature:
How to use the Prohibit duplicate values setting?
Prevent users from entering the same input by enabling the Prohibit duplicate values setting per field.
Steps:
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Go into the Field Settings for the field you want to prevent duplicate values by clicking on the icon.
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Check the Prohibit duplicate values checkbox. (Default: unchecked)
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Save the Field Settings.
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Update the Kintone App.
Limitations
Text Field: If the prohibition of duplicate values is set for the field, the number of characters allowed for the field will be limited to 64 in half-width or full-width.
Link Field: If the prohibition of duplicate values is set for the field, the number of characters allowed for the field will be limited to 64 in half-width or full-width.
For more information, refer to the Field Entry Limits help documentation.
Example
Here is a screenshot of a Text field settings where the Prohibit duplicate values setting is highlighted: