提交後確定欄位是否已更改

在將記錄儲存在資料庫中之後，我們想要檢查記錄上的更改內容。我們將通過比較舊記錄例項和新記錄例項之間的值來進行此檢查。

// 1.0, Revealing Module pattern
var myNamespace = myNamespace || {};
myNamespace.example = (function () {

    /**
     * User Event 1.0 example detailing usage of the Submit events
     *
     * @appliedtorecord employee
     */
    var exports = {};

    function afterSubmit(type) {
        notifySupervisor();
    }

    function notifySupervisor() {
        // Old and New record instances are retrieved from global functions
        var employee = nlapiGetNewRecord();
        var prevEmployee = nlapiGetOldRecord();

        // If Employee Status didn't change, there's nothing to do
        if (!didStatusChange(employee, prevEmployee)) {
            return;
        }

        // Otherwise, continue with business logic...
    }

    function didStatusChange(employee, prevEmployee) {
        var status = employee.getFieldValue("employeestatus");
        var prevStatus = prevEmployee.getFieldValue("employeestatus");

        /* !! Caution !!
         * Empty fields from the Old record come back as `null`
         * Empty fields from the New record come back as an empty String
         * This means  you cannot simply compare the old and new
         */
        return ((prevStatus || status) && (status !== prevStatus));
    }

    exports.afterSubmit = afterSubmit;
    return exports;
})();

// 2.0
define(["N/runtime"], function (runtime) {

    /**
     * User Event 2.0 example detailing usage of the Submit events
     *
     * @NApiVersion 2.x
     * @NModuleScope SameAccount
     * @NScriptType UserEventScript
     * @appliedtorecord employee
     */
    var exports = {};

    function afterSubmit(scriptContext) {
        notifySupervisor(scriptContext);
    }

    function notifySupervisor(scriptContext) {
        // Old and New records are simply properties on scriptContext
        var employee = scriptContext.newRecord;
        var prevEmployee = scriptContext.oldRecord;

        // If Employee Status didn't change, there's nothing to do
        if (!didStatusChange(employee, prevEmployee)) {
            return;
        }

        // Otherwise, continue with business logic...
    }

    function didStatusChange(employee, prevEmployee) {
        var status = employee.getValue({"fieldId" : "employeestatus"});
        var prevStatus = prevEmployee.getValue({"fieldId" : "employeestatus"});

        /* !! Caution !!
         * Empty fields from the Old record come back as `null`
         * Empty fields from the New record come back as an empty String
         * This means  you cannot simply compare the old and new
         */
        return ((prevStatus || status) && (status !== prevStatus));
    }

    exports.afterSubmit = afterSubmit;
    return exports;
});

在比較舊記錄和新記錄之間的值時要非常謹慎。從空場舊紀錄是返回 null，而從空領域的新記錄中為空字串返回。這意味著你不能簡單地比較舊的和新的，否則你會得到誤報。你編寫的任何邏輯都必須處理一個 null 和一個空字串的情況。