Validate Fields in Client Side (#2565)

* Create fieldValidation.js

* Create README.md

* README.md

Author: prudvi-sai-posetty

Client-Side Components/Client Scripts/Field Validations/README.md

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+An `onLoad` client script that validates required fields in specific ServiceNow form views.
+
+This ServiceNow client script provides automatic validation of required form fields when users access specific form views. The script runs immediately when a form loads and checks that critical fields are populated, displaying user-friendly error messages for any missing required information. This ensures data completeness and improves form submission success rates by catching validation issues early in the user workflow.
+
+What This Script Does:
+The onLoad client script performs comprehensive field validation with these key capabilities:
+View-Specific Validation: Only triggers validation when accessing a designated form view
+Multiple Field Support: Validates multiple required fields simultaneously in a single operation
+Smart Field Detection: Uses field labels (not technical names) in error messages for better user experience
+Consolidated Error Display: Shows all missing required fields in a single, clear error message
+Immediate Feedback: Provides instant validation results as soon as the form loads
+Non-Intrusive Design: Displays informational errors without blocking form interaction

Client-Side Components/Client Scripts/Field Validations/fieldValidation.js

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+function onLoad(){
+  var targetViewName = 'your_target_view_name';
+    var requiredFields = ['field1', 'field2', 'field3'];
+    
+    var currentViewName = g_form.getViewName();
+    
+    if (currentViewName === targetViewName) {
+        var emptyFields = [];
+        
+        for (var i = 0; i < requiredFields.length; i++) {
+            var fieldValue = g_form.getValue(requiredFields[i]);
+            if (!fieldValue || fieldValue.trim() === '') {
+                emptyFields.push(g_form.getLabelOf(requiredFields[i]));
+            }
+        }
+        
+        if (emptyFields.length > 0) {
+            var errorMessage = "The following required fields cannot be empty: " + 
+                             emptyFields.join(', ');
+            g_form.addErrorMessage(errorMessage);
+        }
+    }
+}