Ext JSとprototype.jsで作るリッチなUIextform.FormView = { …（略）… // 都道府県と対応する市町村の表示 changeCity: function(form, url) { var city = form.findField('city') if (city) { form.remove(city); city.destroy(); } var store = new Ext.data.JsonStore({ url: url, root: 'cities', fields: ['value', 'dispvalue'] }); city = new Ext.form.ComboBox({ renderTo: 'city_container', store: store, id: 'city', displayField: 'dispvalue', valueField: 'value', typeAh
