Set and lock variable by group (#2185)

* Create set_lock_variable_by_grp.js

* Create README.md

Author: MYaswanth28

Client-Side Components/Catalog Client Script/Set and Lock Variable by Group/README.md

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+**Set and Lock Variable by Group**
+
+This solution provides a secure and dynamic way to control data entry on a Service Catalog form based on the user's group membership. It is typically used to pre-fill and lock certain justification or approval bypass fields for authorized users (like managers or executive staff), improving their efficiency while maintaining an accurate audit trail.
+
+This functionality requires a combined Client-side (Catalog Client Script) and Server-side (Script Include) approach to ensure the group check is done securely.

Client-Side Components/Catalog Client Script/Set and Lock Variable by Group/set_lock_variable_by_grp.js

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+// onload Catalog Client Script with Catalog Name 
+function onLoad() {
+    var variableName = 'bypass_approval_reason';
+    var targetGroupName = 'ServiceNow Support'; // The group authorized to skip this step
+    var ga = new GlideAjax('UserUtils');
+    ga.addParam('sysparm_name', 'isMemberOf');
+    ga.addParam('sysparm_group_name', targetGroupName);
+    ga.getXMLAnswer(checkAndLockVariable);
+    function checkAndLockVariable(response) {
+        var isMember = response;
+        if (isMember == 'true') {
+            var message = 'Value set and locked due to your ' + targetGroupName + ' membership.';
+            var setValue = 'Bypassed by authorized ' + targetGroupName + ' member.';
+            g_form.setValue(variableName, setValue);
+            g_form.setReadOnly(variableName, true);
+            g_form.showFieldMsg(variableName, message, 'info');
+        } else {
+            g_form.setReadOnly(variableName, false);
+        }
+    }
+}
+
+//Script Include
+var UserUtils = Class.create();
+UserUtils.prototype = Object.extendsObject(AbstractAjaxProcessor, {
+    isMemberOf: function() {
+        var groupName = this.getParameter('sysparm_group_name');
+        var isMember = gs.getUser().isMemberOf(groupName);
+        return isMember.toString();
+    },
+
+    type: 'UserUtils'
+});