Servis-Rhino 4211B Betriebsanweisung PDF herunterladen (Seite 192)

dijit/tree/Model that owns the data shown in a dijit/Tree. What it does is map from a

dojo/store to the tree model.

Each element in the store must have the following:

• id – A unique id that is unique against all other elements in the store.

• name – The label shown in the tree. The name of this property is the default but can be

changed with the "labelAttr" property.

• type – The type of the item in the tree. The name of this property is the default but can be

changed with the "typeAttr" property.

• parent – The id of the parent in the tree

The store object that holds the data should have a getChildren() method added to it. This

should return the children of the passed in item. This is needed to obtain the children for the tree.

By default, the tree seems to show an expand/contract for every entity in it. We can be a bit better

about this by implementing the mayHaveChildren method on the ObjectStoreModel to

return true or false. We should return false only if we know that the entry will never have children.

An example of creating an ObjectStoreModel might be:

var store = new Memory({

data: [

{ id: 0, name:'Root', type:'Root'}

]

}); // End of store

store.getChildren = function(item){

// Add a getChildren() method to store for the data model where

// children objects point to their parent (aka relational model)

return this.query({parent: this.getIdentity(item)});

};

store = new Observable(store);

var model = new ObjectStoreModel({

store: store,

query: {id: 0},

mayHaveChildren: function(item) {

if (item.type == "Metric") {

return false;

}

return true;

}

});

Keine Kommentare

Servis-Rhino 4211B Betriebsanweisung Seite 192