if (params[key].constructor === Array) {

public/react/src/common/UrlTool2.js

@@ -4,7 +4,13 @@ const queryString = {
 	  	for (let key in params) {
 			// https://stackoverflow.com/questions/6566456/how-to-serialize-an-object-into-a-list-of-url-query-parameters
 			if (params[key] != undefined) {
-	    		paramsUrl += `${key}=${encodeURIComponent(params[key])}&`
+				if (params[key].constructor === Array) {
+					for (let singleArrIndex of params[key]) {
+						paramsUrl = paramsUrl + key + '[]=' + singleArrIndex + '&'
+					}
+				} else {
+		    		paramsUrl += `${key}=${encodeURIComponent(params[key])}&`
+				}
 			}
 	  	}
 	  	if (paramsUrl == '') {