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I have included some javascript in SharePoint master page, I need this javascript to have access to the opened list ID.

For example when I load 

 www.mypage.com/codev/_layouts/15/start.aspx#/Lists/All Fields/AllItems.aspx

I need my JavaScript function to have access to the list: All Fields ID.

Notice there is no query string. I suppose I could extract the list name from the URL but as I'm trying to make it work on any site/list combination I was hoping there would be an easier way to extract the current opened list ID's GUID.

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At least two options are available to determine List Id on View page:

Option 1: SP.ListOperation.Selection Methods

SP.ListOperation.Selection.getSelectedList() Method gets the ID of the list being selected by the client user. The following example will return List Id in a View page.

Example:

var listId = SP.ListOperation.Selection.getSelectedList();

Option 2: spPageContextInfo client context

With every page is associated client context (_spPageContextInfo object), that object contains List Id when the View page is rendered. The following example demonstrates how to get List Id in View page.

Example:

//get current List Id in View page
var listId = _spPageContextInfo.pageListId;
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Check out the ctx variable. There's lots of great info in there. In your case, what you need is:

ctx.listName
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