combobox级联查询

Question

有2个combobox 选中左边的数据后 右边自动显示相对应的数据(数据从数据库中查出来的) 如何做到这样的级联查询(asp.net mvc框架) 望高手指点!!!

Answer 1

就在第一个combobox的selectindexchange的事件中根据第一个选的主键来获取第二个的数据。

Answer 2

这个是省市区三级联动的，参考下{
    layout: "form",
    items: { xtype: "combo", fieldLabel: "所在省", width: 130, store: new Ext.data.Store({ proxy: new Ext.data.HttpProxy({ url: "" }),
        reader: new Ext.data.JsonReader({ id: "Key", root: "data" }, [{ name: "Key" }, { name: "Value"}]), baseParams: { action: "" }, autoLoad: true
    }),
        mode: "local", valueField: "Key", triggerAction: "all", readOnly: true, displayField: "Value", hiddenName: "ProvinceId", name: "ProvinceId", listeners: {
            select: function(combo, record, index) {
                form.findField("CityId").clearValue();
                form.findField("CityId").getStore().load({ params: { args: record.id} });
            }
        }
    }, columnWidth: .5
},
{
    layout: "form",
    items: { xtype: "combo", fieldLabel: "所在市", width: 130, store: new Ext.data.Store({ proxy: new Ext.data.HttpProxy({ url: "" }),
        reader: new Ext.data.JsonReader({ id: "Key", root: "data" }, [{ name: "Key" }, { name: "Value"}]), baseParams: { action: "" }
    }),
        mode: "local", valueField: "Key", triggerAction: "all", readOnly: true, displayField: "Value", hiddenName: "CityId", name: "CityId", listeners: {
            select: function(combo, record, index) {
               form.findField("CountyId").clearValue();
               form.findField("CountyId").getStore().load({ params: { args: record.id} });
            }
        }
    }, columnWidth: .5
},
{
    layout: "form",
    items: { xtype: "combo", fieldLabel: "所在区", width: 130, store: new Ext.data.Store({ proxy: new Ext.data.HttpProxy({ url: "" }),
        reader: new Ext.data.JsonReader({ id: "Key", root: "data" }, [{ name: "Key" }, { name: "Value"}]),
        baseParams: { action: "" }
    }),
        mode: "local", valueField: "Key", triggerAction: "all", readOnly: true, displayField: "Value", hiddenName: "CountyId", name: "CountyId"
    }, columnWidth: .5
}