如何在ExtJs中使用过滤器?

问题描述:

我使用ExtJ创建了一个商店,我想将商店的值加载到ComboBox。但是在加载值之前,我需要根据另一个组合框中选择的值来过滤一些数据。

I created a store using ExtJs and i want to load the value of store to ComboBox. But before loading values i need to filter some data based on value selected in another comboBox.

所以为了这个目的,我想我需要在商店上应用过滤器,请任何身体可以帮助我如何做到这一点。

So for that purpose i think i need to apply filter on store, please any body can help me how i can do that.

型号: -

Ext.define('City', {
extend: 'Ext.data.Model',
fields: [
        { name: 'StateId', type: 'string' },
        { name: 'City', type: 'string' },
]});

商店: -

var cityStore = Ext.create('Ext.data.Store', {
model: 'City',
data : [
    { StateId: '1', City: 'Bangalore'},
    { StateId: '1', City: 'Mysore'},
    { StateId: '1', City: 'Dharwad'},
    { StateId: '2', City: 'Mumbai'},
    { StateId: '2', City: 'Pune'},
    { StateId: '2', City: 'Nagpur'}
   ]});

现在我使用这个 cityStore 加载到Combobox中。但是在加载之前,如果 stateId为1 ,则只有3个记录(班加罗尔,迈索尔,Dharwad)加载到组合框中,如果 stateId为2 那么其他3条记录将加载到组合框中。

Now i am using this cityStore to load in Combobox. but before load i want if stateId is 1 then only 3 records (Bangalore, Mysore, Dharwad) are load in combobox and if stateId is 2 then other 3 records are load in combobox. How i can achive it.

根据 Ext.data.Store过滤器方法文档:

var stateId = 1; // your value
cityStore.clearFilter(true);
cityStore.filter('StateId', stateId);

更新

我发现ComboBox本身过滤数据,没有机会改变它的行为。但是我看到这个问题的两个解决方案:

I've found that ComboBox filters data by itself and there is no opportunity to change it's behaviour. But I see two solutions of this problem:


  1. 手动过滤数据(参见 Ext.util.MixedCollection过滤器)并将其加载到您的商店(请参阅 Ext.data.Store加载

  1. Filter data manually (see Ext.util.MixedCollection filter) and load it into your store (see Ext.data.Store load)

禁用商店的 clearFilter 过滤器方法,并使用自己的 cityFilter

Disable store's clearFilter and filter methods and use own cityFilter:

Ext.define('CityStore', {
    extend: 'Ext.data.Store',
    filter: Ext.emptyFn,
    clearFilter: Ext.emptyFn,
    cityFilter: function (stateId) {
        Ext.data.Store.prototype.clearFilter.call(this);
        Ext.data.Store.prototype.filter.call(this, 'StateId', stateId);
    }
});

然后使用 cityFilter() / p>

Then use cityFilter() method.