Angular 角度2实施路由使用策略
我实现了Angular 角度2实施路由使用策略,angular,routes,Angular,Routes,我实现了RouteReuseStrategy建议并进行了一些更新,因为在shoulldattach上,routeConfig.path为空,并且未缓存处理程序。我有@angular/router:3.4.7 import {RouteReuseStrategy, DetachedRouteHandle, ActivatedRouteSnapshot} from "@angular/router" export class CustomReuseStrategy implements Route
RouteReuseStrategy
建议并进行了一些更新,因为在shoulldattach
上,routeConfig.path
为空,并且未缓存处理程序。我有@angular/router:3.4.7
import {RouteReuseStrategy, DetachedRouteHandle, ActivatedRouteSnapshot} from "@angular/router"
export class CustomReuseStrategy implements RouteReuseStrategy {
handlers: {[key: string]: DetachedRouteHandle} = {};
currentPath: string = '';
shouldDetach(route: ActivatedRouteSnapshot): boolean {
return true
}
store(route: ActivatedRouteSnapshot, handle: DetachedRouteHandle): void {
this.handlers[route.routeConfig.path] = handle
}
shouldAttach(route: ActivatedRouteSnapshot): boolean {
// todo route.routeConfig.path was empty
if (!!this.currentPath && !!this.handlers[this.currentPath]) {
route.routeConfig.path = this.currentPath;
return true
} else {
return false
}
}
retrieve(route: ActivatedRouteSnapshot): DetachedRouteHandle {
if (!route.routeConfig) return null;
return this.handlers[route.routeConfig.path]
}
shouldReuseRoute(future: ActivatedRouteSnapshot, curr: ActivatedRouteSnapshot): boolean {
this.currentPath = curr.routeConfig && curr.routeConfig.path;
return future.routeConfig === curr.routeConfig
}
deleteHandler(handler:string) {
this.handlers[handler] && delete this.handlers[handler]
}
}
一切正常,但当我第三次尝试导航回某条路线时,出现以下错误:
EXCEPTION: Uncaught (in promise): Error: Cannot reattach ActivatedRouteSnapshot with a different number of children
Error: Cannot reattach ActivatedRouteSnapshot with a different number of children
at setFutureSnapshotsOfActivatedRoutes (http://localhost:4200/js/vendor.bundle.js:93110:15) [angular]
at createNode (http://localhost:4200/js/vendor.bundle.js:93091:9) [angular]
at http://localhost:4200/js/vendor.bundle.js:93131:16 [angular]
at Array.map (native) [angular]
at createOrReuseChildren (http://localhost:4200/js/vendor.bundle.js:93124:26) [angular]
at createNode (http://localhost:4200/js/vendor.bundle.js:93086:41) [angular]
at http://localhost:4200/js/vendor.bundle.js:93128:24 [angular]
at Array.map (native) [angular]
at createOrReuseChildren (http://localhost:4200/js/vendor.bundle.js:93124:26) [angular]
at createNode (http://localhost:4200/js/vendor.bundle.js:93086:41) [angular]
at createRouterState (http://localhost:4200/js/vendor.bundle.js:93072:33) [angular]
at MapSubscriber.project (http://localhost:4200/js/vendor.bundle.js:26366:153) [angular]
at MapSubscriber._next (http://localhost:4200/js/vendor.bundle.js:15890:35) [angular]
at MapSubscriber.Subscriber.next (http://localhost:4200/js/vendor.bundle.js:4861:18) [angular]
at MergeMapSubscriber.notifyNext (http://localhost:4200/js/vendor.bundle.js:19133:30) [angular]
at InnerSubscriber._next (http://localhost:4200/js/vendor.bundle.js:106234:21) [angular]
at InnerSubscriber.Subscriber.next (http://localhost:4200/js/vendor.bundle.js:4861:18) [angular]
at MapSubscriber._next (http://localhost:4200/js/vendor.bundle.js:15896:26) [angular]
at MapSubscriber.Subscriber.next (http://localhost:4200/js/vendor.bundle.js:4861:18) [angular]
at ReduceSubscriber._complete (http://localhost:4200/js/vendor.bundle.js:36808:30) [angular]
at ReduceSubscriber.Subscriber.complete (http://localhost:4200/js/vendor.bundle.js:4886:18) [angular]
at MergeMapSubscriber._complete (http://localhost:4200/js/vendor.bundle.js:19125:30) [angular]
at MergeMapSubscriber.Subscriber.complete (http://localhost:4200/js/vendor.bundle.js:4886:18) [angular]
at ArrayObservable._subscribe (http://localhost:4200/js/vendor.bundle.js:12465:24) [angular]
at ArrayObservable.Observable._trySubscribe (http://localhost:4200/js/vendor.bundle.js:221:25) [angular]
at ArrayObservable.Observable.subscribe (http://localhost:4200/js/vendor.bundle.js:209:27) [angular]
at MergeMapOperator.call (http://localhost:4200/js/vendor.bundle.js:19075:23) [angular]
at Observable.subscribe (http://localhost:4200/js/vendor.bundle.js:206:22) [angular]
at ReduceOperator.call (http://localhost:4200/js/vendor.bundle.js:36763:23) [angular]
at Observable.subscribe (http://localhost:4200/js/vendor.bundle.js:206:22) [angular]
at MapOperator.call (http://localhost:4200/js/vendor.bundle.js:15867:23) [angular]
at Observable.subscribe (http://localhost:4200/js/vendor.bundle.js:206:22) [angular]
at Object.subscribeToResult (http://localhost:4200/js/vendor.bundle.js:5096:27) [angular]
...
我也有同样的问题,上个星期我一直在努力。我现在觉得很好用主要挑战是为任何给定路由定义唯一密钥。我发现RouterUseStrategy在为应用程序配置子路由和延迟加载时,理解和定义每个路由的密钥变得有点复杂。我试图解释我的理解,我希望这些信息能有所帮助 路由使用策略
我试图找出RouteReuseStrategy方法调用和参数详细信息,以生成唯一密钥,并通过调试我的应用程序得出以下图表。注意到有时会将阶段参数传递给方法调用,并尝试在RouterUseStrategy实现中忽略这些参数 客户重用策略 路由使用策略实施:
/* tslint:disable */
import {ActivatedRouteSnapshot, DetachedRouteHandle, Params, RouteReuseStrategy} from "@angular/router";
interface RouteStorageObject {
snapshot: ActivatedRouteSnapshot;
handle: DetachedRouteHandle;
}
export class CustomReuseStrategy implements RouteReuseStrategy {
storedRoutes: { [key: string]: RouteStorageObject } = {};
getFurthestDecendantParams(route: ActivatedRouteSnapshot, sum: any): ActivatedRouteSnapshot {
if (route.children.length > 0) {
let child: ActivatedRouteSnapshot = route.children[0];
sum.sum = sum.sum + this.sumParams(child.params);
return this.getFurthestDecendantParams(child, sum);
}
return route;
}
sumParams(params: Params): string {
return Object.keys(params).reduce((param, key) => {
return param + params[key];
}, "");
}
calcKey(route: ActivatedRouteSnapshot) {
let paramKey = {
sum: ""
}
if (route.children.length > 0) {
this.getFurthestDecendantParams(route, paramKey).params;
} else {
paramKey.sum = this.sumParams(route.params);
}
if (paramKey.sum != "") {
paramKey.sum = "_" + paramKey.sum;
}
return route.data.key + paramKey.sum;
}
public shouldDetach(route: ActivatedRouteSnapshot): boolean {
console.info("CustomReuseStrategy.shouldDetach() - route key: " + this.calcKey(route));
return !("product" === this.calcKey(route));
}
public store(route: ActivatedRouteSnapshot, handle: DetachedRouteHandle): void {
let storedRoute: RouteStorageObject = {
snapshot: route,
handle: handle
};
console.info("CustomReuseStrategy.store() - route key: " + this.calcKey(route));
this.storedRoutes[this.calcKey(route)] = storedRoute;
}
public shouldAttach(route: ActivatedRouteSnapshot): boolean {
console.info("CustomReuseStrategy.shouldAttach() - route key: " + this.calcKey(route));
return this.storedRoutes[this.calcKey(route)] !== undefined;
}
public retrieve(route: ActivatedRouteSnapshot): DetachedRouteHandle {
console.info("CustomReuseStrategy.retrieve() - route key: " + this.calcKey(route));
if (this.storedRoutes[this.calcKey(route)] === undefined) {
/* Just return undefined */
return null;
} else {
return this.storedRoutes[this.calcKey(route)].handle;
}
}
public shouldReuseRoute(future: ActivatedRouteSnapshot, curr: ActivatedRouteSnapshot): boolean {
let returnValue = (future.routeConfig === curr.routeConfig);
if (future.routeConfig != null && curr.routeConfig != null) {
returnValue = this.calcKey(future) === this.calcKey(curr);
console.info("CustomReuseStrategy.shouldReuseRoute() - future: " + this.calcKey(future) + ", curr: " + this.calcKey(curr) +
", future.routeConfig.path:" + future.routeConfig.path + ", curr.routeConfig.path:" + curr.routeConfig.path + ", returnValue: " + returnValue);
} else {
console.info("CustomReuseStrategy.shouldReuseRoute() - future: " + this.calcKey(future) + ", curr: " + this.calcKey(curr) +
", future.routeConfig:" + future.routeConfig + ", curr.routeConfig:" + curr.routeConfig + ", returnValue: " + returnValue);
}
return returnValue;
}
}
总之
在我的应用程序和RouterUseStrategy中定义的以下内容很好
- 使用数据键和子级延迟加载定义的路由
- 只有单程出口
- 每个路由的唯一密钥
- 角度版本2.4.10和路由器版本3.4.10