Number validation script

Client-Side Components/Client Scripts/Only number validation for input/Number Validation Script.js

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+function onChange(control, oldValue, newValue, isLoading, g_form) {
+    if (isLoading || newValue === '') return;
+
+    var fieldName = control.name;
+    var fieldLabel = g_form.getLabel ? g_form.getLabel(fieldName) : fieldName;
+    var numericPattern = /^[0-9]+$/;
+
+    // Hide old messages safely
+    if (g_form.hideFieldMsg) g_form.hideFieldMsg(fieldName, true);
+
+    // Validation logic
+    if (!numericPattern.test(newValue)) {
+        // Reset only if API supported
+        if (g_form.setValue && typeof g_form.setValue === 'function') {
+            g_form.setValue(fieldName, oldValue);
+        }
+
+        // Show the message directly below the field
+        if (g_form.showFieldMsg) {
+            g_form.showFieldMsg(
+                fieldName,
+                'Please enter numbers only', // your custom message
+                'error',
+                false // false = display under the field, not at top
+            );
+        } else {
+            alert('Short Description filed accepts numbers only');
+        }
+    }
+}

Client-Side Components/Client Scripts/Only number validation for input/Readme.md

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+Numeric-Only Field Validation — Client Script (ServiceNow)
+Overview
+
+This Client Script validates that a specific field contains numbers only on ServiceNow forms.
+If the user enters non-numeric characters, it:
+
+Resets the field to the previous valid value.
+
+Displays an inline error message directly below the field.
+
+Ensures previous error messages are cleared to avoid duplicates.
+
+This script works in Classic UI forms and safely handles environments where certain g_form APIs may not be available.
+
+Features
+
+Validates input dynamically as the user types (OnChange).
+
+Resets invalid input to previous value.
+
+Shows a clear, field-level error message: "Please enter numbers only".
+
+Avoids displaying messages at the top of the form.
+
+Compatible with instances where g_form.showFieldMsg, g_form.hideFieldMsg, or g_form.setValue may not exist.
+
+Usage Instructions
+1. Create the Client Script
+
+Navigate to System Definition → Client Scripts.
+
+Click New to create a client script.
+
+2. Configure the Script
+
+Name: Numeric-Only Validation
+
+Table: Choose the table you want to validate (e.g., incident).
+
+Type: onChange
+
+Field: The field you want to validate (e.g., short_description).
+
+Active: Checked