Standardizing Client-Server Communication via Custom Ajax Wrappers Overview: This article outlines the implementation of a custom wrapper for Client-Server communication in ServiceNow. By using a centralized utility, developers can simplify GlideAjax calls, standardize error handling, and significantly reduce code duplication across Client Scripts and UI Policies. The Wrapper Concept: Standard GlideAjax implementation requires repetitive boilerplate code for every server-side call. A wrapper class condenses this into a single-line execution, abstracting the parameter mapping and asynchronous callback logic. Implementation: The UI Script: To deploy this utility, create a Global UI Script. Below is the recommended structure for the SysAjaxUtil wrapper: /** * SYSAJAXUTIL WRAPPER * Centralised utility to simplify GlideAjax calls. */var SysAjaxUtil = { ga: function(siName, method, params, success, failure, async) { // 1. Initialise the ServiceNow GlideAjax Object var ga = new GlideAjax(siName); ga.addParam('sysparm_name', method); // 2. Automatically map parameters from the object to GlideAjax if (params && typeof params === 'object') { for (var key in params) { if (params.hasOwnProperty(key)) { ga.addParam(key, params[key]); } } } // 3. Execution Logic if (async) { ga.getXMLAnswer(success); } else { return ga.getXMLWait(); } }}; Usage: Calling the Wrapper in a Client Script: Use the following syntax to trigger a server-side Script Include: // Example Wrapper CallSysAjaxUtil.ga('ScriptIncludeName', 'MethodName', params, success, failure, true); ⚠️ Warning on Synchronous Calls:The ga.getXMLWait() method is not supported in Service Portal or Mobile. You must pass true for the async parameter in these environments. Pros and Cons: FeatureDescription✅ Cleaner CodeReplaces 10+ lines of boilerplate code with a single, readable function call.✅ Unified MaintenanceGlobal logging or security updates can be applied to the wrapper without editing individual Client Scripts.⚠️ Portal DependencyUI Scripts are not auto-loaded in Service Portal; the utility must be manually added to the Portal Theme JS Includes.⚠️ Sync LimitationsSynchronous calls will fail in Service Portal. Developers must adhere to asynchronous patterns.