Knockout.js ko.用TypeScript计算
我有以下问题。以下代码在JS中工作:Knockout.js ko.用TypeScript计算,knockout.js,typescript,devextreme,Knockout.js,Typescript,Devextreme,我有以下问题。以下代码在JS中工作: Application1.Trackers = function (params) { var viewModel = { dsTrackers: new DevExpress.data.DataSource({ store: Application1.db, searchExpr: "Bezeichnung" }), searchString: ko.observable(''), fin
Application1.Trackers = function (params) {
var viewModel = {
dsTrackers: new DevExpress.data.DataSource({
store: Application1.db,
searchExpr: "Bezeichnung"
}),
searchString: ko.observable(''),
find: function () {
viewModel.showSearch(!viewModel.showSearch());
viewModel.searchString('');
},
showSearch: ko.observable(false),
};
ko.computed(function () {
return viewModel.searchString();
}).extend({
throttle: 500
}).subscribe(function (value) {
viewModel.dsTrackers.filter("Bezeichnung", "contains", value);
viewModel.dsTrackers.pageIndex(0);
viewModel.dsTrackers.load();
});
return viewModel;
})
在Typescript中,我尝试了这种方式,但不起作用:
module MyExtremeApp {
export function Trackers(params: { id: any }) {
return {
dsTrackers: new DevExpress.data.DataSource({
store: MyGlobals.oTrackerManager.getTrackerCustomStore(),
searchExpr: "Bezeichnung"
}),
searchString: ko.observable(''),
find: function () {
this.showSearch(!this.showSearch());
this.searchString('');
},
showSearch: ko.observable(false),
};
ko.computed(() => {
return this.searchString();
}).extend({
throttle: 500
}).subscribe(function (value) {
this.dsTrackers.filter("Bezeichnung", "contains", value);
this.dsTrackers.pageIndex(0);
this.dsTrackers.load();
});
}
}
它从不跳转到ko.computed()。有人知道为什么没有吗?
我是打字新手
多谢各位。
最好的祝愿既然您正在迁移到TypesScript,那么您应该使用该操作来考虑面向对象,并使用类和模块。这样您就可以生成可读性更强的代码。 您的类可以如下所示: 但是您的问题是基于确保subscrption和computed在类的构造函数中设置(或者在您的示例中等于构造函数)。
事实上,您不需要在示例中使用computed,因为您可以扩展Throttling的Knockout observable。在进入计算定义之前调用return。
import mm_data = require('pathToMyDataClass');
import mm_globals = require('pathToMyGlobals');
export interface ITrackerParms {
id: any;
}
export class Trackers {
constructor(parms: ITrackerParms) {
this.parms = parms;
this.dsTrackers = new DevExpress.data.DataSource({
store: mm_globals.MyGlobals.oTrackerManager.getTrackerCustomStore(),
searchExpr: "Bezeichnung"
});
this.searchString.extend({ throttle: 500 });
this.searchString.subscribe((val: string) => {
this.dsTrackers.filter("Bezeichnung", "contains", val);
this.dsTrackers.pageIndex(0);
this.dsTrackers.load();
}, this);
}
public parms: ITrackerParms;
public dsTrackers: mm_data.ITrackerSource; //interface from your datasource module
public showSearch = ko.observable(false);
public searchString = ko.observable('');
public find() : void {
this.showSearch(!this.showSearch());
this.searchString('');
}
}