Change Value of a dojo tree node - dojo

Question

I'm trying to change the value of a dojo tree to display the correct icon. I was hopping that I could get the object with fetchItemByIdentity() and change the value there but the item is null
_target: null,
_treeModel: null,
constructor: function(target, uuid) {
this._target = target;
this._uuid = uuid;
// from somewhere else the value get's changed
topic.subscribe("questionChanged", lang.hitch(this, function(object, id) {
var item = this._treeModel.fetchItemByIdentity({
identifier: id,
onItem: function(item, request) { alert("item " + item); }
});
}));
},
buildTree: function() {
xhr.get({
// The URL to request
url: er.getAbsoluteUrl("/secure/staticquestion/tree?uuid=" + this._uuid),
handleAs: "json",
headers: {
"Content-Type": "application/json; charset=utf-8"
},
preventCache: 'true',
// The method that handles the request's successful result
load: lang.hitch(this, function(response) {
var rawdata = new Array();
rawdata.push(response);
var store = new ItemFileReadStore({
data: {
identifier: "uuid",
label: "name",
items: rawdata
}
});
this._loadtree(store);
}),
error: function(err, ioArgs) {
errorDialog.show(err.message);
}
});
},
_loadtree: function(store) {
this._treeModel = new TreeStoreModel({
store: store,
query: {
name: 'root'
},
childrenAttrs: [ "children" ],
mayHaveChildren: function(object) {
return object.children.length > 0;
}
});
var tree = new Tree({ // create a tree
model: this._treeModel, // give it the model
showRoot: false,
getIconClass: function(/* dojo.data.Item */item, /* Boolean */opened) {
if (!item || this.model.mayHaveChildren(item)) {
return opened ? "dijitFolderOpened" : "dijitFolderClosed";
} else if (item.comment == 'false') {
return (item.answer == 'YES') ? "dijitLeafNoCommentYes"
: ((item.answer == 'NO') ? "dijitLeafNoCommentNo" : "dijitLeafNoComment");
} else if (item.comment == 'true') {
return (item.answer == 'YES') ? "dijitLeafYes" : ((item.answer == 'NO') ? "dijitLeafNo"
: "dijitLeaf");
}
return "dijitLeaf";
},
}, this._target); // target HTML element's id
tree.on("click", function(object) {
topic.publish("staticQuestionSelected", object);
}, true);
tree.startup();
}
I'm glad for help, thanks!

Answer 1

Ok, I found my issue: I need to use a ItemFileWriteStore and there I can change values with store.setValue(item, attribute, value). The tree updates itself afterwards.