White space validation

Client-Side Components/Client Scripts/Whitespace Validation/Readme.md

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+Whitespace Validation — Client Script (ServiceNow)
+Overview
+
+This Client Script ensures that a field does not contain any whitespace characters. It validates user input in real-time and provides immediate feedback by displaying an inline error message directly below the field. Invalid input is cleared automatically to enforce proper data entry.
+
+Features
+
+Prevents any spaces in the field value.
+
+Displays field-level error messages below the input field.
+
+Automatically clears invalid input for user correction.
+
+Simple, lightweight, and does not use regex or getLabelOf.
+
+Works dynamically for any field where the Client Script is applied.
+
+Usage Instructions
+1. Create the Client Script
+
+Navigate to System Definition → Client Scripts.
+
+Click New to create a new Client Script.
+
+2. Configure the Script
+
+Name: Whitespace Validation
+
+Table: Select the target table (e.g., sys_user)
+
+Type: onChange
+
+Field: Select the field to validate (e.g., username, phone)
+
+Active: Check this box

Client-Side Components/Client Scripts/Whitespace Validation/White Space Validation.js

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+function onChange(control, oldValue, newValue, isLoading) {
+    if (isLoading || !newValue) return;
+
+    var fieldName = control.name;
+
+    // Check for any whitespace
+    if (newValue.includes(' ')) {
+        // Show inline error message below the field
+        if (g_form.showFieldMsg) {
+            g_form.showFieldMsg(
+                fieldName,
+                'This field cannot contain spaces.',
+                'error',
+                false // false = show below the field
+            );
+        }
+
+        // Clear the field
+        g_form.setValue(fieldName, '');
+    } else {
+        // Remove any previous message if input is valid
+        if (g_form.hideFieldMsg) g_form.hideFieldMsg(fieldName, true);
+    }
+}