NetSuite - Force Single Select on Multi-Select Field

Issue: We had a request from our Stakeholders to change a Multi-Select Field to a Single Select.  The Issue came up with this field being part of a bundle that we use.  

We didn't want to deal with this being reverted or causing issues after we updated the bundle in the future, so I cam up with this work around.

It is a Client Script that will throw an error to the user if they select more than one, and then it will reduce the selection to one option.

/**

 * @NApiVersion 2.x

 * @NScriptType ClientScript

 *

 * 2025 Prevents multiple selections in a multi-select field * by showing an error message and removing the last selected value.

 *

 */

define(['N/ui/message', 'N/runtime'], function(message, runtime) {

    function fieldChanged(context) {

        var scriptObj = runtime.getCurrentScript();

        var fieldName = scriptObj.getParameter({             name: 'custscript_CUSTOM_FIELD'             });  // Field ID to prevent multiple selections

       

        var currentRecord = context.currentRecord;

        var fieldId = context.fieldId;

        if (fieldId === fieldName) {

            var selectedValues = currentRecord.getValue({ fieldId: fieldName });

            if (selectedValues.length > 1) {

                // Show error message if more than one option is selected

                message.create({

                    title: 'Error',

                    message: 'You can only select one option.',

                    type: message.Type.ERROR

                }).show();

                // Remove the last selected value

                selectedValues.pop();

                currentRecord.setValue({

                    fieldId: fieldName,

                    value: selectedValues

                });

            }

        }

    }

    return {

        fieldChanged: fieldChanged

    };

});