Javascript to handle getting the file

gistfile1.js

function getDocItems(id) {
        $.ajax({
            url: "<URL TO GET THE DOCUMENT>?id=" + id,
            dataType: "json",
            cache: false
        }).error(function (jqXHR, textStatus) {
        }).success(function (data) {
            for (var key in data) {
                var html = '<p><a href="<URL TO GET FILE>/GetFile?id=' + data[key].Id + '&type=' + data[key].MimeType + '" >' + data[key].FileName + '</a></p>';
                $('#YourElementId').append(html);
            }
       });
    }