Contextinfo error in sharepoint office 365 hosted addin with web part getting list titles

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I've got an SharePoint Hosted Add-in written in Visual Studio 2013 that has a web part that is deployed to a SharePoint Office 365 site. The web part surfaces fine on the page but when I try to get list titles from the site I get an error about the contextinfo.

I've set the AppManifest.xml to have the following Permissions

Scope: Web
Permission: Manage

Here is the script code in the web part .aspx file

JavaScript

$(document).ready(function ()
{
    hostweburl = decodeURIComponent(getQueryStringParameter('SPHostUrl'));
    appweburl = decodeURIComponent(getQueryStringParameter('SPAppWebUrl'));

    loadDependentScripts();
});


// Function to retrieve a query string value.
// For production purposes you may want to use
// a library to handle the query string.
function getQueryStringParameter(paramToRetrieve)
{
    var params = document.URL.split("?")[1].split("&");
    var strParams = "";
    for (var i = 0; i < params.length; i = i + 1)
    {
        var singleParam = params[i].split("=");
        if (singleParam[0] == paramToRetrieve)
            return singleParam[1];
    }
}

function loadDependentScripts()
{
    var scriptbase = hostweburl + "/_layouts/15/";

    // Load the js files and continue to the successHandler
    $.getScript(scriptbase + "SP.Runtime.js",
        function ()
        {
            $.getScript(scriptbase + "SP.js",
                function () { $.getScript(scriptbase + "SP.RequestExecutor.js", getHostWebListsUsingREST); }
                );
        }
    );
}


function getHostWebListsUsingREST()
{
    var executor;

    // although we're fetching data from the host web, SP.RequestExecutor gets initialized with the app web URL..
    executor = new SP.RequestExecutor(appweburl);
    executor.executeAsync(
        {
            url: appweburl + "/_api/SP.AppContextSite(@target)/web/lists/?@target='" + hostweburl + "'",
            method: "GET",
            headers: { "Accept": "application/json; odata=verbose" },
            success: onGetHostWebListsUsingRESTSuccess,
            error: onGetHostWebListsUsingRESTFail
        }
    );
}

function onGetHostWebListsUsingRESTSuccess(data)
{
    var jsonObject = JSON.parse(data.body);
    var lists = jsonObject.d.results;
    var listsHtml = $.each(lists, function (index, list)
    {
        $('#lists').append(list.Title + "(" + list.ItemCount + ")<br />");
    });
}

function onGetHostWebListsUsingRESTFail(data, errorCode, errorMessage)
{
    alert('Failed to get host site. Error:' + errorMessage);
}

HTML nothing fancy

HTML

<body>
    <div>
        <p id="message">
        <!-- The following content will be replaced with the user name when you run the app - see App.js -->
        initializing...
        </p>
    </div>
    <div>
        <p id="results">
        </p>
    </div>
</body>

The errors I'm getting are as follows in the 'sp.runtime.js'

Unhandled exception at line 2, column 60952 in https://myhost.sharepoint.com/_layouts/15/sp.runtime.js

0x800a138f - JavaScript runtime error: Unable to set property 'https://myhost.sharepoint.com/sites/Developer/Ven/TestSharePointAppPart/Pages/TestSharePointAppPart/_api/contextinfo' of undefined or null reference

And the alert from the script says

'Failed to get host site: Error:Forbidden'

What I have tried:

I've tried different permissions in the AppManifest.xml and I've got permissions on my login to create anything in the site.

Posted 16-Aug-16 23:13pm

IJFleet

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