Accessing the SharePoint list in custom webpart

Question

I am creating the webpart in my app for SharePoint 2013 and office 365. I have tried to accessing the SharePoint list in my webpart using ajax request like this,

$.ajax({
    type: "GET",
    dataType: 'json',
    url: siteURL + "/_vti_bin/ListData.svc/" + listName,
    error: function (evt) {
        alert("Error");
    },
    success: function (data) {
        // Processing the data.
    }
});

It throws cross domain accessing error message. If i add a 'Access-Control-Allow-Origin' headers to access the cross domain then it shows "preflight is invalid redirect error" message. How to get the sharepoint list items in custom webpart.

Answer 1

The App runs in a different Domain, so you can't just call another Domain (the HostWeb)

You have to execute through SharePoint's own SP.RequestExecutor

See all SO posts:

https://sharepoint.stackexchange.com/search?q=RequestExecutor