ServiceNow Course in India - ServiceNow Online Training

1. What is a Client Script in ServiceNow? In the world of ServiceNow, providing a seamless and interactive user experience is essential. One of the most powerful tools that ServiceNow administrators and developers have at their disposal for this purpose is the Client Script. Client Scripts enable dynamic changes on forms and lists directly within the user's browser without needing to interact with the server constantly. But what exactly are Client Scripts, and how do they work? Let’s explore. Introduction to Client Scripts A Client Script in ServiceNow is a piece of JavaScript code that runs in the user's browser rather than on the server. It allows developers to enhance the behavior of forms, fields, and lists, providing real-time feedback, data validation, and interactivity. ServiceNow Training In simple terms, whenever a user interacts with a form (like filling out an incident ticket), Client Scripts can validate fields, auto-populate values, show or hide fields dynamically, and even alert users based on their input — all without waiting for the server's response. By minimizing server round-trips and enhancing responsiveness, Client Scripts improve overall system performance and user satisfaction. Why are Client Scripts Important?  Enhanced User Experience: Provide immediate feedback without waiting for the form to submit.  Performance Optimization: Reduce unnecessary server calls by handling validations and data changes on the client side.  Dynamic Forms: Enable smart forms that change according to user input (show/hide fields, auto-fill values).

2.  Validation: Ensure users input correct and complete information before submission. In short, Client Scripts make ServiceNow applications smarter and more user-friendly. Types of Client Scripts in ServiceNow ServiceNow offers four types of Client Scripts, each designed for specific interactions: 1. OnLoad () The onLoad script runs when a form is loaded. It is often used to:  Set default values for fields.  Hide/show certain fields when the form opens.  Display messages or alerts when users open a form. Example use case: Display a welcome message when a user opens a New Incident form. Javascript CopyEdit Function onLoad () { Alert ('Welcome! Please fill in all mandatory fields.'); } 2. OnChange () The onChange script is triggered when a user changes the value in a specific field. Use it to: ServiceNow Online Training  Validate a field immediately after it is modified.  Dynamically adjust other field values based on user input.  Show or hide fields conditionally. Example use case: If the Priority field is set to "High," automatically make the Impact field mandatory. Javascript CopyEdit Function onChange (control, old Value, new Value, is Loading) { If (is Loading || new Value == '') { Return; } If (new Value == 'High') { g_form.setMandatory ('impact', true); } } 3. OnSubmit ()

3. The onSubmit script executes when the user submits a form. Typical uses:  Validate form data before sending it to the server.  Stop the submission if certain conditions are not met.  Display custom warning or error messages. Example use case: Prevent users from submitting a form if the Description field is empty. Javascript CopyEdit Function onSubmit () { If (g_form.getValue ('description') == '') { Alert (‘Please fill in the Description before submitting.'); Return false; } Return true; } 4. OnCellEdit () The onCellEdit script is specific to list editing. It triggers when a cell value in a list view is changed directly. Use it to:  Validate inline edits.  Trigger additional updates after a list cell change. Example use case: Automatically update the state of an incident to "In Progress" when the Assignment Group is changed in a list. Javascript CopyEdit Function onCellEdit (sysIDs, table, oldValues, new Values, callback) { Alert ('Cell edited. Refreshing list...'); Callback (); } How to Create a Client Script in ServiceNow Creating a Client Script is simple and intuitive: ServiceNow Course Online 1.Navigate to System Definition > Client Scripts. 2.Click New. 3.Fill in the fields: oName: A Meaningful name for your script. oTable: The table (like Incident, Change Request) where the script should apply.

4. oUI Type: Desktop, Mobile, or both. oType: Choose onLoad, onChange, onSubmit, or onCellEdit. 4.Write your JavaScript code in the Script field. 5.Click Submit to save. ServiceNow also provides templates and examples to help you get started. Best Practices for Writing Client Scripts To ensure your Client Scripts are efficient and easy to maintain, follow these best practices:  Keep it Lightweight: Avoid heavy processing in the client-side script to prevent slow form loading.  Minimize g_form Access: Every call to g_form (like g_form.setVisible, g_form.setValue) adds overhead. Use them judiciously.  Avoid Duplicate Scripts: Check if a similar Client Script already exists before creating a new one.  Error Handling: Add error messages and validation to prevent unexpected behaviors.  Use Descriptive Names: Name your scripts and include comments for maintainability.  Test Thoroughly: Always test scripts under different scenarios (e.g., different user roles) to ensure robustness.  Use g_scratchpad for Data: If you need server-side data on the client side, use g_scratchpad to pass it securely and efficiently. ServiceNow Institute Common Functions Used in Client Scripts ServiceNow provides several useful methods that are often used in Client Scripts: Function Description g_form.getValue(fieldName) g_form.setValue(fieldName, value) g_form.setVisible(fieldName, boolean) g_form.setMandatory(fieldName, boolean) g_form.showFieldMsg(fieldName, message, type) g_form.clearValue(fieldName) Gets the value of a field. Sets a field's value. Shows or hides a field. Makes a field mandatory or optional. Shows a message (info, error, or warning) near a field. Clears the value of a field. Mastering these functions can make writing effective Client Scripts much easier. Advantages of Using Client Scripts  Real-time Validation: Immediate feedback before form submission.  Better Performance: Less dependency on server-side scripts.  Improved UX: Interactive, user-friendly forms.  Customization: Ability to build tailored forms and workflows.

5. Limitations of Client Scripts While Client Scripts are powerful, they have a few limitations:  Browser Dependent: Since they run in the browser, browser compatibility should be considered.  Security Risks: Sensitive validations should not only rely on Client Scripts; server- side validation is a must.  Performance Impact: Poorly written scripts can slow down form load times. Understanding these limitations helps developers strike the right balance between functionality and performance. ServiceNow Course Conclusion Client Scripts in ServiceNow are a vital tool for creating responsive, user-friendly forms and improving the user experience. They allow developers to validate, manipulate, and react to user input instantly without making server calls. However, it's essential to design them carefully, keep them optimized, and always pair them with server-side validations to ensure security and efficiency. Mastering Client Scripts opens the door to creating highly interactive and intelligent ServiceNow applications that delight users and make processes more streamlined. Trending Courses: Docker and Kubernetes, SAP Ariba, Site Reliability Engineering Visualpath is the Best Software Online Training Institute in Hyderabad. Avail is complete worldwide. You will get the best course at an affordable cost. For More Information about ServiceNow Online Training Contact Call/WhatsApp: +91-7032290546 Visit: https://www.visualpath.in/servicenow-online-training-in- hyderabad.html