我有一个Kendo Grid,我只想在第一次加载时使用自定义过滤器。我从一个远程数据源中提取,所以我想我会绑定到dataBinding
事件,操纵数据源来添加一个过滤器,然后将它发回去。
我可能错了,但我的理解是dataBinding
是一个触发数据源前读取的事件,这就是我想在那里注入过滤器的原因。
[更新#1:]
我正在使用Kendo的ASP.NET MVC包装器来生成这个,但我想通过Javascript进行过滤,因为这就是我获取myCustomGridFilters
数组的方式。我有一个我创建的JS网格扩展类,它包含额外的网格功能。这已经为我的所有网格实例化了,所以我不想手动进入每个网格MVC包装器初始化并添加过滤器。
供参考,这是我的ASP.NET MVC代码中的数据源构建器:
// remainder of Kendo Grid wrapper
.DataSource(dataSource => dataSource
.Ajax()
.PageSize(ViewUtilities.GetDefaultGridSettings().DefaultPageSize)
.Read(read => read.Action("ListThreatsOverview", "Threats"))
.ServerOperation(true)
.Sort(sort => sort.Add("ActiveInDevices").Descending())
.Model(model =>
{
model.Id(u => u.Id);
model.Field(u => u.FileHashId).Editable(false);
model.Field(u => u.CommonName).Editable(false);
model.Field(u => u.ActiveInDevices).Editable(false);
model.Field(u => u.BlockedInDevices).Editable(false);
model.Field(u => u.SuspiciousInDevices).Editable(false);
})
)
我创建了一个JSFiddle来模拟我的场景。我知道它不是我的代码的完全复制品,但它完全复制了我的情况:
以下是我应用于applyCustomFilter()
事件的dataBinding
js方法:
function applyCustomFilter (dataSource) {
// find custom filters
var customFilters = myCustomGridFilters.length ? myCustomGridFilters : [];
// if no custom filters, return
if (customFilters.length === 0) return;
// apply custom filter
// get currently applied filters from the Grid.
var currFilterObj = dataSource.filter();
// get current set of filters, which is supposed to be array.
// if the oject we obtained above is null/undefined, set this to an empty array
var currentFilters = currFilterObj ? currFilterObj.filters : [];
// loop over custom filters
for (var i = 0; i < customFilters.length; i++) {
var filterField = customFilters[i].field;
var filterValue = customFilters[i].value;
var filterOperator = customFilters[i].operator;
// iterate over current filters array. if a filter for "filterField" is already
// defined, remove it from the array
// once an entry is removed, we stop looking at the rest of the array.
if (currentFilters && currentFilters.length > 0) {
for (var i = 0; i < currentFilters.length; i++) {
if (currentFilters[i].field == filterField) {
currentFilters.splice(i, 1);
break;
}
}
}
currentFilters.push({ field: filterField, operator: filterOperator, value: filterValue });
}
// apply filters
dataSource.filter({
logic: "and",
filters: currentFilters
});
// remove custom filters
myCustomGridFilters.length = 0;
}
我的JSFiddle示例:http://jsfiddle.net/fmpeyton/crhLvq44/
我有这个工作,但我注意到我的网格正在加载数据两次;一次初始和第二次过滤数据。这显然不太理想。
最终,我的目标是在第一次加载时过滤我的网格,而不必从我的远程源读取单独的数据源来过滤。我怎样才能做到这一点?还有其他我应该订阅的活动吗?
答案 0 :(得分:2)
只需将过滤器添加到数据源即可。遗憾的是,JSFiddle在这里被阻止,所以看不到你的代码。
Kendo UI
var dataSource = new kendo.data.DataSource({
data: [
{ name: "Tea", category: "Beverages" },
{ name: "Coffee", category: "Beverages" },
{ name: "Ham", category: "Food" }
],
filter: {
// leave data items which are "Food" or "Tea"
logic: "or",
filters: [
{ field: "category", operator: "eq", value: "Food" },
{ field: "name", operator: "eq", value: "Tea" }
]
}
});
Kendo MVC
@(Html.Kendo().Grid<MyModel>()
.Name("Grid")
.Columns(columns =>
{
columns.Bound(c => c.Type);
columns.Bound(c => c.Count);
columns.Bound(c => c.Date);
})
.Filterable()
.Pageable(pageable => pageable
.PageSizes(true)
.ButtonCount(10))
.DataSource(ds => ds
.Ajax()
.Read(r => r.Action("GetGridData", "Home", new { code = 'code' }))
.PageSize(25)
.Filter(f => f.Add(a => a.Type).Contains("something"))
)
)