DynamicTableQueryUtil

Client-Side Components/Catalog Client Script/Reusable GlideAjax Client Script/DynamicTableQueryUtil.js

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+var DynamicTableQueryUtil = Class.create();
+DynamicTableQueryUtil.prototype = Object.extendsObject(AbstractAjaxProcessor, {
+
+    getTableRow: function() {
+        var tableName = this.getParameter('sysparm_table_name');
+        var keyField = this.getParameter('sysparm_key_field');
+        var keyValue = this.getParameter('sysparm_key_value');
+        var fieldsParam = this.getParameter('sysparm_fields');
+        var limitFields = !JSUtil.nil(fieldsParam);
+        var desiredFields = limitFields ? fieldsParam.split(',') : [];
+
+        var result = {};
+        var tableObj = {};
+        var gr = new GlideRecord(tableName);
+
+        // Use addQuery for non-sys_id fields
+        if (keyField === 'sys_id') {
+            if (!gr.get(keyValue)) {
+                return null;
+            }
+        } else {
+            gr.addQuery(keyField, keyValue);
+            gr.query();
+            if (!gr.next()) {
+                return null;
+            }
+        }
+
+        // Handle variables (if present)
+        if (gr.variables) {
+            for (var key in gr.variables) {
+                if (!JSUtil.nil(gr.variables[key])) {
+                    var variableObj = gr.variables[key];
+                    tableObj['variables.' + key] = {
+                        fieldDisplayVal: variableObj.getDisplayValue() || String(variableObj),
+                        fieldVal: String(variableObj)
+                    };
+                }
+            }
+        }
+
+        // Handle standard fields
+        var fields = gr.getFields();
+        for (var i = 0; i < fields.size(); i++) {
+            var field = fields.get(i);
+            var fieldName = field.getName();
+            tableObj[fieldName] = {
+                fieldDisplayVal: field.getDisplayValue() || String(field),
+                fieldVal: String(field)
+            };
+        }
+
+        // Add sys_id explicitly
+        tableObj['sys_id'] = {
+            fieldDisplayVal: 'Sys ID',
+            fieldVal: gr.getUniqueValue()
+        };
+
+        // Filter fields if requested
+        if (limitFields) {
+            desiredFields.forEach(function(field) {
+                field = field.trim();
+                if (tableObj[field]) {
+                    result[field] = tableObj[field];
+                }
+            });
+        } else {
+            result = tableObj;
+        }
+
+        return new JSON().encode(result);
+    }
+});

Client-Side Components/Catalog Client Script/Reusable GlideAjax Client Script/Readme.md

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+This solution provides a generic and reusable GlideAjax-based client-server interaction in ServiceNow that allows querying any table by passing:
+
+Table name
+Key field and value
+Desired fields to retrieve
+
+It dynamically returns field values from the server and populates them on the form, making it ideal for use cases like CMDB enrichment, entitlement lookups, or dynamic form population.
+
+1. Client Script (onChange)
+Triggers on field change.
+Sends parameters to the Script Include via GlideAjax.
+Receives JSON response and sets target field value.
+
+Parameters:
+sysparm_table_name: Table to query (e.g., sys_user)
+sysparm_key_field: Field to match (e.g., sys_id)
+sysparm_key_value: Value to match
+sysparm_fields: Comma-separated list of fields to retrieve
+
+2. Script Include: DynamicTableQueryUtil
+
+Processes incoming parameters.
+Queries the specified table and retrieves requested fields.
+Supports both standard fields and catalog item variables.
+Returns a JSON object with field values and display values.

Client-Side Components/Catalog Client Script/Reusable GlideAjax Client Script/clientscript.js

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+function onChange(control, oldValue, newValue, isLoading) {
+    if (isLoading || newValue === '') {
+        return;
+    }
+
+    // Define parameters dynamically
+    var tableName = 'sys_user'; // Change as needed
+    var keyField = 'sys_id'; // Change as needed
+    var fieldsToFetch = 'email'; // Comma-separated list
+    var targetField = 'user'; // Field to populate
+
+    var ga = new GlideAjax('DynamicTableQueryUtil');
+    ga.addParam('sysparm_name', 'getTableRow');
+    ga.addParam('sysparm_table_name', tableName);
+    ga.addParam('sysparm_key_field', keyField);
+    ga.addParam('sysparm_key_value', newValue);
+    ga.addParam('sysparm_fields', fieldsToFetch);
+    ga.getXML(function(response) {
+        var answer = response.responseXML.documentElement.getAttribute("answer");
+        if (!answer) {
+            alert('No response from Script Include');
+            return;
+        }
+
+        var parsedAnswer = JSON.parse(answer);
+        if (parsedAnswer[fieldsToFetch]) {
+            g_form.setValue(targetField, parsedAnswer[fieldsToFetch]['fieldVal']);
+        } else {
+            alert('error');
+        }
+    });
+}