Sharepoint 2013 app custom action - how to get parameters using JavaScript

Question

I'm learning to write SharePoint 2013 applications. I added menu item custom action, and now I'm trying to add some functionality to App.js. Custom action contains the following code:

<UrlAction Url="~appWebUrl/Pages/Default.aspx?{StandardTokens}&amp;SPListItemId={ItemId}&amp;SPListId={ListId}" />

And I'm trying to get parameters like "SPListItemId" and "SPListId" in App.js. I found the following code:

 function getParameterByName(name) {
    name = name.replace(/[\[]/, "\\[").replace(/[\]]/, "\\]");
    var regex = new RegExp("[\\?&]" + name + "=([^&#]*)"),
    results = regex.exec(location.search);
    return results == null ? "" : decodeURIComponent(results[1].replace(/\+/g, " "));
}

I'm calling this function like, but it doesn't work:

var SPListId = getParameterByName('ListId');

Please tell me where is my mistake.

Answer 1

You need to use

var SPListId = getParameterByName('SPListId');