Fix GH-115 Cannot select documents with checkboxes on DNN 9

Author: roman-yagodin

R7.Documents/js/selectDocuments.js

@@ -14,7 +14,8 @@ function r7d_selectDocument(documentId, checked, value) {
 }
 function r7d_getModuleId(target) {
 	var c = $(target).closest("div.DnnModule").attr("class");
-	return c.substr(c.lastIndexOf("DnnModule-") + 10);
+	var moduleId = c.match("DnnModule-(\\d+)")[1];
+	return moduleId;
 }
 function r7d_selectDocument2(target) {
 	var documentId = $(target).data("document-id");
@@ -25,4 +26,4 @@ function r7d_selectDocument2(target) {
 function r7d_selectDeselectAll(target) {
 	var moduleId = r7d_getModuleId(target);
 	$("div.DnnModule-" + moduleId + " .EditCell input[type='checkbox']").prop("checked", target.checked).trigger("change");
-}
+}