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Overview
The combo box performs the tasks of a select box and textbox, allowing a user to select from a list or enter a specific value. The value property determines what selected option value will be populated in the field when the program gets the screen input. The values are always what is displayed in the field. The list of choices can be loaded in a variety of ways, please see below for more detail.
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To find more information on the choice selection criteria and choices parameter properties, view the Parameter Markers section here.
Blank Option
The blank option property allows you to provide a option containing blank text before any other choices from the database file are displayed.
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If you are unable to get any information to display on your choice URL script you can use the showErrors() API to try and debug the reason the results are unable to display.
showErrors() API Documentation
Example of the showErrors() API displaying JSON error response example:
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