Calling SP.ClientContext in a loop Javascript

Question

I'm looping through a number of sites to run a query that checks whether new content has been added to document libraries in that site in the previous three days. However, I'm having problems. When I get to the success callback, it is always on the last doc library, site context in that list. Is there something I'm missing here?

var queryItems = function(myContext, myDocName, mySelector){
    function getNewContent(x, y, z) {
        var myContext = x,
            myDocName = y,
            mySelector = z;
        function success() {
            if( items.get_count() > 0 ) {
                $(mySelector).find(".newContent").show();
            }
        }
        function fail() {
            console.log("Failed loading new content");
        }

        var myCtx = new SP.ClientContext(myContext),
            myList = myCtx.get_web().get_lists().getByTitle(myDocName),
            myQuery = new SP.CamlQuery(),
            date = new Date(),
            ISODate = ISODateString(new Date( date.getFullYear(), date.getMonth(), date.getDate() - 3 ) );
            myQuery.set_viewXml('<View><Query><Where><Gt><FieldRef Name="Created" /><Value Type="DateTime">' + ISODate + '</Value></Gt></Where></Query></View>');
            this.items = myList.getItems(myQuery);
            myCtx.load( this.items );
            myCtx.executeQueryAsync(Function.createDelegate(this, success), Function.createDelegate(this, fail));
        };
        return getNewContent(myContext, myDocName, mySelector);
    }           

    for ( var obj in objDocLibs) {
        (function(datum, sel) {
            queryItems(context, datum, sel);
        })(objDocLibs[obj].name, selector)
    }
}

I have updated to use a callback in the for loop, however, It is still returning 0 for the number of items. — jonvines
– jonvines, Commented Mar 20, 2013 at 12:42

jonvines · Accepted Answer · 2013-03-21 11:38:34Z

I managed to get this working using promises, code below:

var queryItems = function(myContext, myDocName, mySelector) {
    var dfd = $.Deferred( function() {
        var inContxt = myContext,
            inDoc = myDocName, 
            myCtx = new SP.ClientContext(inContxt),
            myList = myCtx.get_web().get_lists().getByTitle(inDoc),
            myQuery = new SP.CamlQuery(),
            date = new Date(),
            ISODate = ISODateString(new Date( date.getFullYear(), date.getMonth(), date.getDate() - 3 ) );

        myQuery.set_viewXml('<View><Query><Where><Gt><FieldRef Name="Created" /><Value Type="DateTime">' + ISODate + '</Value></Gt></Where></Query></View>');
        var items = myList.getItems(myQuery);
        myCtx.load( items );
        myCtx.executeQueryAsync(
            function() { 
                var itemCount = items; 
                dfd.resolve(itemCount);
            },
            function() {
                dfd.reject(args.get_message());
            }
        );
    });
    return dfd.promise();
};

for ( var obj in objDocLibs) {
    (function(datum, sel, con) {
        queryItems(con, datum.name, sel).done( function(myItems) {
            if( myItems.get_count() > 0 ) {
                $(sel).find(".newContent").show();
            }
        });
    })(objDocLibs[obj], selector, context)
}

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