source: main/trunk/greenstone3/web/interfaces/default/js/favouritebasket/favouritebasket.js

//used to stored the current items in basket, including collection name and document id
//in the format of collection:id. it is updated when the page is loaded (reloaded) or the user adds
// new items in the basket. 

// note we only support favourites now, not the old drag and drop berry baskets
// berry is still used here for legacy reasons
var berryList =  new Array();
var show = false;


var countFavouritesUNUSED = function(callback) {
        var request_type = "GET";
    var url = gs.xsltParams.library_name + "?a=pr&rt=r&ro=1&s=GetNumFavourites&o=XML&hhf="+makeURLComponentSafe("[{\"name\":\"Cache-Control\", \"value\":\"no-cache\"}]")+"&c=";

    var responseSuccess = function(o) {
        
    var response = o.responseXML;
    var size = response.getElementsByTagName('size').item(0).getAttribute('value');
    
    var items = response.getElementsByTagName('documentNode');

    callback(items.length);
    }

    YAHOO.util.Connect.asyncRequest(request_type , url , {success: responseSuccess });
 
}


// display selected favourites (filled-in star icon) on page
var favouritesCheckout = function(){

    if ( document.getElementById('berrybasket') == null ) return;
    
    var request_type = "GET";
    var url = gs.xsltParams.library_name + "?a=pr&rt=r&ro=1&s=GetNumFavourites&o=XML&hhf="+makeURLComponentSafe("[{\"name\":\"Cache-Control\", \"value\":\"no-cache\"}]")+"&c=";

    var responseSuccess = function(o){
        
        var response = o.responseXML;
        var size = response.getElementsByTagName('size').item(0).getAttribute('value');

        var items = response.getElementsByTagName('documentNode');

        berryList = new Array();
        for (var i=0;i < items.length ; i++ ){

            var itemID = items[i].getAttribute('collection')+":"+items[i].getAttribute('nodeID');
            var item = YAHOO.util.Dom.get(itemID);

            if (item != null){
                    item.src = gs.variables.selected_favourite_icon_url;
                    item.setAttribute("data-is-favourite","true");
            }
            berryList[berryList.length] = itemID;//items[i];
        }

        // set favourite images visible
        // they are set to be invisible to prevent flickering when first loaded (see favourites.css)

        var berries = document.getElementsByTagName('img');

        for (var j=0; j < berries.length; j++){
            var berry = berries[j]; 
            var parent = berry.parentNode;
            if (parent !=null && parent.id == "documentberries"){
                var root = YAHOO.util.Dom.get(berry.id+":root");
                var section = YAHOO.util.Dom.get(berry.id+":section");
                if(root!=null && root.id.indexOf(berry.id) !=-1){
                    root.style.visibility ="visible" ;
                }

                if(section!=null && section.id.indexOf(berry.id) !=-1){
                    section.style.visibility ="visible" ;
                }
            }

            if (berry.className && berry.className == 'pick'){
                berry.style.visibility = "visible";
            }
        }
        updateFavouritesCount();
    }

    var responseFailure = function(o){
        console.error("GetNumFavourites AJAX call failed:" + url);
    }

    var callback = {
        success: responseSuccess,
        failure: responseFailure
    }

    //var date = new Date();
    //url += "&rand=" + date.getTime();
    YAHOO.util.Connect.asyncRequest(request_type , url , callback);
}



function updateFavouritesCount() {
    var favouritesCountElement = YAHOO.util.Dom.get('favouritesCountDisplay');
    if ( favouritesCountElement == null ) return;
    if ( berryList.length == 0 ) {
        favouritesCountElement.innerHTML = "(0)";
    } else {
        favouritesCountElement.innerHTML = "(" + berryList.length + ")";
    }
}



function addFavourite(el){
    var addurl = gs.xsltParams.library_name + "?a=pr&rt=r&ro=1&s=AddFavourite&c=&s1.id=2&o=XML&hhf="+makeURLComponentSafe("[{\"name\":\"Cache-Control\", \"value\":\"no-cache\"}]")+"&s1.item=" + el.id;

    var request_type = "GET";
    var addSuccess = function(o){
        var result = o.responseXML;
        var items = result.getElementsByTagName('documentNode');

        if (items.length > 0){
            // assumes that there is only 1 item to add
            var item = items[0];
                    var itemID = item.getAttribute('collection')+":"+item.getAttribute('nodeID');
            berryList[berryList.length]= itemID;

                updateFavouritesCount();
        }

    }

    var addFailure = function(o){
    }

    var addcallback = {
        success:addSuccess,
        failure:addFailure
    }
    
    YAHOO.util.Connect.asyncRequest(request_type , addurl , addcallback);
}


function deleteFavourite(el){
    var delurl = gs.xsltParams.library_name + "?a=pr&rt=r&ro=1&s=DeleteFavourites&c=&o=XML&hhf="+makeURLComponentSafe("[{\"name\":\"Cache-Control\", \"value\":\"no-cache\"}]")+"&s1.items=" + el.id;

    var request_type = "GET";
    var delSuccess = function(o){

            for (var i in berryList) {
                        var berry = berryList[i];
                console.log(berry);
                        //var id = berry.getAttribute('collection')+":"+berry.getAttribute('nodeID');

                        if (berry == el.id){
                                berryList.splice(i,1);

                                break;
                        }

                }
            updateFavouritesCount();
        
    }

    var delFailure = function(o){
    }

    var delcallback = {
        success:delSuccess,
        failure:delFailure
    }
    
    YAHOO.util.Connect.asyncRequest(request_type , delurl , delcallback);
}



function toggleFavourite(el)
{
    var is_favourite = el.getAttribute("data-is-favourite");
    if (is_favourite == "true") {
    deleteFavourite(el);
    el.src = gs.variables.unselected_favourite_icon_url;
    el.setAttribute("data-is-favourite","false")
    }
    else {
    addFavourite(el);
    el.src = gs.variables.selected_favourite_icon_url;
    el.setAttribute("data-is-favourite","true")
    }
}

YAHOO.util.Event.addListener(window, 'load', favouritesCheckout);
//YAHOO.util.Event.addListener(window, 'click', basketUpdate);