Script include Filter records and return the values to client side (#2663)

* Create script.js

* Create read.md

Author: kishoretk92

Server-Side Components/Script Includes/Filter record/read.md

@@ -0,0 +1,5 @@
+This Script Include is useful for:
+
+Filtering user records based on field from table data.
+Populating reference fields or dropdowns dynamically via GlideAjax.
+Client-side filtering based on server-side data logic.

Server-Side Components/Script Includes/Filter record/script.js

@@ -0,0 +1,27 @@
+/*This Script Include is useful for:
+
+Filtering user records based on field from table data.
+Populating reference fields or dropdowns dynamically via GlideAjax.
+Client-side filtering based on server-side data logic.*/
+
+var <Script_include_name> = Class.create();
+<Script_include_name>.prototype = Object.extendsObject(global.AbstractAjaxProcessor, {
+    <functionname>: function() {
+        var validID = [];
+        var gr = new GlideAggregate("<table_name>");
+		gr.addQuery("field","value");
+        gr.addAggregate("COUNT");
+        gr.groupBy("fieldname");
+        gr.query();
+        while (gr.next()) {
+            var id = gr.getValue("fieldname");
+
+            validID.push(id);
+
+        }
+
+        var varname = "user_nameIN" + validID;
+        return varname;
+    },
+type: '<Script_include_name>'
+});