Unable to update rating (rating column) on host document using JavaScript Object Model API inside sharepoint hosted apps

Question

Hi Everyone,
We are developing SharePoint hosted apps for Office 365, for that we are going
to implement document rating functionality inside Sharepoint app. The host web contain document library (“Documents”) and from apps we need to rate each document. The rating functionality working fine with CQWP in team site  using
JavaScript Object Model API.
But the same code is not working inside apps and giving error:-
If we are using app context than error will be:-
"List does not exist.
The page you selected contains a list that does not exist.  It may have been deleted by another user."
And for Host context than error will be:-
"Unexpected response data from server."
Please help on this
Please see below code..
'use strict';
var web, list, listItems, hostUrl, videoId, output = "";
var videoLibrary = "Documents";
var context, currentContext;
var lists, listID;
var list, parentContext;
var scriptbase;
(function () {
    // This code runs when the DOM is ready and creates a context object which is 
    // needed to use the SharePoint object model
    $(document).ready(function () {
        hostUrl = decodeURIComponent(getQueryStringParameter("SPHostUrl"));
        context = SP.ClientContext.get_current();      
        SP.SOD.executeFunc('sp.js', 'SP.ClientContext', sharePointReady);
    function sharePointReady() {
        scriptbase = hostUrl + "/_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.Core.js", function () {
                    $.getScript(scriptbase + "reputation.js", function () {
                        $.getScript(scriptbase + "sp.requestexecutor.js", execCrossDomainRequest);
    //Query list from hostweb
    function execCrossDomainRequest() {       
        //Load the list from hostweb
        parentContext = new SP.AppContextSite(context, hostUrl);
        web = parentContext.get_web();
        list = web.get_lists().getByTitle(videoLibrary);
        context.load(list, 'Title', 'Id');
        var camlQuery = new SP.CamlQuery();
        camlQuery.set_viewXml('<View><Query><OrderBy><FieldRef Name="Modified" Ascending="FALSE"/></OrderBy></Query><RowLimit>1</RowLimit></View>');
        listItems = list.getItems(camlQuery);        
        context.load(listItems);
        context.executeQueryAsync(onQuerySucceeded, onQueryFailed);
    //Process the image library
    function onQuerySucceeded() {       
        var lstID = list.get_id();
        var ctx = new SP.ClientContext(hostUrl);       
        var ratingValue = 4;
        EnsureScriptFunc('reputation.js', 'Microsoft.Office.Server.ReputationModel.Reputation', function() {      
        Microsoft.Office.Server.ReputationModel.Reputation.setRating(ctx, lstID, 1, ratingValue);       
        ctx.executeQueryAsync(RatingSuccess, RatingFailure);
    function onQueryFailed(sender, args) {
        alert('Failed' + args.get_message());
    function failed(sender, args) {
        alert("failed because:" + args.get_message());
    function RatingSuccess() {
        alert('rating set');
        //displaystar();
    function RatingFailure(sender, args) {
        alert('Rating failed : : ' + args.get_message());
    //Gets the query string paramter
    function getQueryStringParameter(paramToRetrieve) {
        var params;
        params = document.URL.split("?")[1].split("&");
        for (var i = 0; i < params.length; i = i + 1) {
            var singleParam = params[i].split("=");
            if (singleParam[0] == paramToRetrieve) return singleParam[1];
Thanks & Regards
Sanjay 
Thank you in advance! :-)
      

Answer 1

Hi,
According to your post, my understanding is that you want to update list column in SharePoint hosted apps using JavaScript Client Object Model.
Based on the error message, it seems not retrieve the list object in context. I suggest you debug the code step by step using Internet Explorer Developer Tools to
find the problem.
Here are some demos about using JavaScript Client Object Model in SharePoint hosted app:
http://blogs.msdn.com/b/officeapps/archive/2012/09/04/using-the-javascript-object-model-jsom-in-apps-for-sharepoint.aspx
http://sharepoint.stackexchange.com/questions/55334/how-to-access-list-in-sharepoint-hosted-app
http://www.dotnetcurry.com/showarticle.aspx?ID=1028
Best regards
Zhengyu Guo
TechNet Community Support