Get selected list items from Sharepoint Web Part

Question

I am making a web part that will be added to a list page, and I need to access the selected items in the list. I am trying to do this using the following method (mentioned here: Get selected item in SharePoint list):

var context = SP.ClientContext.get_current();
var listId = SP.ListOperation.Selection.getSelectedList(); //get selected list Id
var selectedItemIds = SP.ListOperation.Selection.getSelectedItems(context); //get selected items

I initially included this code as part of a custom view, which worked well, however when running this as part of a web part I get the following error after calling the getSelectedList function:

Uncaught ReferenceError: GetCurrentCtx is not defined

I am assuming this change has to with the fact that the Web Part is running in an IFrame, but I am stuck as to how to get around this. Any help is greatly appreciated.

EDIT:

After adding core.js I now get the following error :

Uncaught ReferenceError: IsNullOrUndefined is not defined

These are all the js files I am including :

<script type="text/javascript" src="/_layouts/15/MicrosoftAjax.js"></script>
<script type="text/javascript" src="/_layouts/15/sp.runtime.js"></script>
<script type="text/javascript" src="/_layouts/15/sp.js"></script>
<script type="text/javascript" src="/_layouts/15/sp.core.js"></script>
<script type="text/javascript" src="/_layouts/15/core.js"></script>

Answer 1

This error occurs since GetCurrentCtx function is a part of core.js SharePoint library, it is intended for getting context info of XLV web part (ContextInfo object), so:

• core.js library have to be loaded first
• it could be executed only in the SharePoint page that contains the instance of XLV web part since ContextInfo object is generated when the XLV web part is rendered on page