Ext comboBox example

rails action

  def get_gallery_type
    data = []
    gallery_type = GalleryType.find:all
    gallery_type.each do |t|
      data << {:gallery_type_id => t.id, :name => t.name}
    end
    render :json => {:gallery_type => data }
  end

store

          var store = new Ext.data.JsonStore({
            url: '/galleries/get_gallery_type',
            root: 'gallery_type',
            fields: ['name', 'gallery_type_id']
          });

comboBox

            new Ext.form.ComboBox({
              store: store,
              name: 'gallery_type',
              displayField: 'name',
              valueField: 'gallery_type_id',
              fieldLabel: 'Gallery Type',
              typeAhead: true,
              forceSelection: true,
              triggerAction: 'all',
              selectOnFocus: true,
              readOnly: true,
              lazyInit: false,
              lazyRender: false,
              allowBlank: false,
              listeners: {
                'render': function(){
                  store.load({
                    callback: function(){
                      if(store.getCount() == 1){
                        form.getForm().findField('gallery_type').setValue(store.getAt(0).get('gallery_type_id'));
                      }
                    }
                  })
                }
              }
            })