Get MRVS values from parent (ServiceNowDevProgram#873)

* Create onload.js

* Create readme.md

Author: ajcooper72

Catalog Client Script/Get MRVS Values from Parent/onload.js

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+function onLoad() {
+
+    /*
+     * work out the parent form based on platform and return the given MRVS data
+     * This could go in a global UI script but that wouldn't work for Portal, 
+     * would love anyone to suggest an alternative for portal :)
+     */
+    function getMRVSDataFromParent(mrvsName) {
+        var parent_g_form = g_service_catalog.parent; // default for backend/platform
+        if (parent.angular) {
+            // this is portal so get a different way
+            var parentItem = parent.angular.element(parent.$('#sc_cat_item').find('sp-variable-layout')[0]).scope();
+            parent_g_form = parentItem.getGlideForm();
+        }
+        var vmData = parent_g_form.getValue(mrvsName);
+        // on portal we get back an empty string rather than an empty array so convert
+        return vmData == '' ? [] : JSON.parse(vmData);
+    }
+
+    var vmJSONData = getMRVSDataFromParent('virtual_machine');
+    console.log("JSON " + JSON.stringify(vmJSONData, '', 3));
+}

Catalog Client Script/Get MRVS Values from Parent/readme.md

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+# Get Multi-row Variable Set Values from parent form
+
+Sometimes you need to query the current set of values for a MRVS from the actual MRVS or another MRVS. 
+This requires getting the data from the parent form, the method to retrieve and the format of the data is different
+when running on the platform or portal.
+
+This script gives a way of getting the values regardless of the platform in use.
+
+On the platform (backend) this could be moved to a global UI Script, but that is not available to portal scripts.
+
+Make sure the UI Type is All, and Isolate Script is false (unchecked).