初衷
之前看到angular2正式发布了，过去看了下，感觉不错，于是入坑。
使用过程中想写一个像angular1那样的拦截器，一路坎坷啊
Angular1中的拦截器
.factory('HttpRequestInterceptor', ['$q', '$injector', 'ConfigService', 'DialogService', function($q, $injector, ConfigService, DialogService) {
return {
request: function(config) {
if (config.method === 'POST') {
config.timeout = 60000;
if (config.data === undefined) {
config.data = {
nologin: 999
};
} else {
config.data.nologin = 999;
}
}
return config;
},
requestError: function(rejection) {
DialogService.alert('发送请求失败，请检查网络');
return $q.reject(rejection);
},
response: function(resp) {
if (resp.data.code !== undefined && resp.data.code !== 0) {
if (resp.data.code === 5003) {
var stateService = $injector.get('$state');
stateService.go('login', {}, {
reload: true
});
} else {
DialogService.alert(resp.data.msg);
}
}
return resp;
},
responseError: function(rejection) {
console.log(rejection);
if (rejection.status === 0) {
DialogService.alert('请求响应错误，请检查网络');
} else if (rejection.status === 500) {
DialogService.alert('服务器出错');
} else {
DialogService.alert('请求失败，请检查网络');
}
return $q.reject(rejection);
}
};
}])Angular2中没有提供，需要自己实现
去Stackoverflow上搜了好久，有相关内容是不错，但过时了。不过思路还是可以借鉴的。
尝试以下
第一篇链接
第二篇链接
第三篇
@Injectable()
export class CustomHttp extends Http {
constructor(backend: ConnectionBackend, defaultOptions: RequestOptions) {
super(backend, defaultOptions);
}
request(url: string | Request, options?: RequestOptionsArgs): Observable {
console.log('request...');
return super.request(url, options).catch(res => {
// do something
});
}
get(url: string, options?: RequestOptionsArgs): Observable {
console.log('get...');
return super.get(url, options).catch(res => {
// do something
});
}
} app.module.ts里写法过时了
bootstrap(AppComponent, [HTTP_PROVIDERS,
new Provider(Http, {
useFactory: (backend: XHRBackend, defaultOptions: RequestOptions) => new CustomHttp(backend, defaultOptions),
deps: [XHRBackend, RequestOptions]
})
]);按照上述代码，写法与angular2 r6不同，不知道怎么改。继续搜索，发现大部分写法都雷同，只是注入方式不同，后面看到了r6的注入方式，折腾几次，有了结果
自己的Intercept
customhttp.ts
import { Injectable } from '@angular/core';
import { Http, Request, RequestOptionsArgs, Response, RequestOptions, ConnectionBackend, Headers } from '@angular/http';
import 'rxjs/Rx';
import { Observable } from 'rxjs/Observable';
import { PubSubService } from './shared/pubsub.service';
@Injectable()
export class CustomHttp extends Http {
_pubsub: PubSubService;
constructor(backend: ConnectionBackend, defaultOptions: RequestOptions, pubsub: PubSubService) {
super(backend, defaultOptions);
this._pubsub = pubsub;
}
request(url: string | Request, options ? : RequestOptionsArgs): Observable < Response > {
console.log("good");
return this.intercept(super.request(url, options));
}
get(url: string, options ? : RequestOptionsArgs): Observable < Response > {
return this.intercept(super.get(url, options));
}
post(url: string, body: string, options ? : RequestOptionsArgs): Observable < Response > {
return this.intercept(super.post(url, body, this.getRequestOptionArgs(options)));
}
put(url: string, body: string, options ? : RequestOptionsArgs): Observable < Response > {
return this.intercept(super.put(url, body, this.getRequestOptionArgs(options)));
}
delete(url: string, options ? : RequestOptionsArgs): Observable < Response > {
return this.intercept(super.put(url, this.getRequestOptionArgs(options)));
}
getRequestOptionArgs(options ? : RequestOptionsArgs): RequestOptionsArgs {
if (options == null) {
options = new RequestOptions();
}
if (options.headers == null) {
options.headers = new Headers();
}
options.headers.append('Content-Type', 'application/json');
return options;
}
intercept(observable: Observable < Response > ): Observable < Response > {
this._pubsub.beforeRequest.emit("beforeRequestEvent")
observable.subscribe(null, (err) => {
console.log('err');
this._pubsub.afterRequest.emit("afterRequestEvent");
this.handleError(err.status);
}, () => {
console.log('complete');
this._pubsub.afterRequest.emit("afterRequestEvent");
});
return observable;
}
handleError(status) {
if (status === 0) {
this._pubsub.errorToast.emit("请求响应错误，请检查网络");
} else if (status === 404) {
this._pubsub.errorToast.emit("请求链接不存在，请联系管理员");
} else if (status === 500) {
this._pubsub.errorToast.emit("服务器出错，请稍后再试");
} else {
this._pubsub.errorToast.emit("未知错误，请检查网络");
}
}
}
pubsup.service.ts
import { Injectable } from '@angular/core';
import { Subject } from 'rxjs/Subject';
// 发布订阅事件, 继承自Subject, emit用于发射事件
class PubSubEvent extends Subject < String > {
constructor() {
super();
}
emit(value) { super.next(value); }
}
@Injectable()
export class PubSubService {
beforeRequest: PubSubEvent;
afterRequest: PubSubEvent;
errorToast: PubSubEvent;
successToast: PubSubEvent;
showPupup: PubSubEvent;
hidePupup: PubSubEvent;
confirm: PubSubEvent;
constructor() {
this.beforeRequest = new PubSubEvent();
this.afterRequest = new PubSubEvent();
this.errorToast = new PubSubEvent();
this.successToast = new PubSubEvent();
this.showPupup = new PubSubEvent();
this.hidePupup = new PubSubEvent();
this.confirm = new PubSubEvent();
}
}
app.module.ts
import { NgModule, Injectable } from '@angular/core';
import { BrowserModule } from '@angular/platform-browser';
import { FormsModule } from '@angular/forms';
import { HttpModule, Http, XHRBackend, RequestOptions } from '@angular/http';
// import { InMemoryWebApiModule } from 'angular-in-memory-web-api';
import { HeroData } from './hero/hero-data';
import { routing } from './app.routing';
import { AppComponent } from './app.component';
import { CrisisCenterComponent } from './crisis/crisis-center.component';
import { MapComponent } from './map/map.component';
import { CustomHttp } from './customhttp';
import { MapService } from './map/map.service';
import { PubSubService } from './shared/pubsub.service';
import { PubSubComponent } from './shared/pubsub.component';
@NgModule({
declarations: [
AppComponent, CrisisCenterComponent, MapComponent, PubSubComponent
],
imports: [
BrowserModule,
FormsModule,
HttpModule,
// InMemoryWebApiModule.forRoot(HeroData),
routing
],
providers: [
MapService,
PubSubService, {
provide: Http,
useFactory: (backend: XHRBackend,
defaultOptions: RequestOptions,
pubsub: PubSubService) => new CustomHttp(backend, defaultOptions, pubsub),
deps: [XHRBackend, RequestOptions, PubSubService]
}
],
bootstrap: [AppComponent],
})
export class AppModule {}
最后是pubsup.component.ts,我是将loading, toast, pupup放在了一起
loading将在每个请求前显示，请求失败或结束隐藏
toast将在请求失败显示2秒钟，或者在其他组件里调用
pupup将在删除事件前提问，想放在delete api里自动显示并处理，但是没有实现
具体代码在我github:https://github.com/jiangbo201...
import { Component, Input } from '@angular/core';
import { Http } from '@angular/http';
import { PubSubService } from './pubsub.service';
@Component({
selector: 'app-pubsub',
templateUrl: './pubsub.component.html',
styleUrls: ['./pubsub.component.css']
})
export class PubSubComponent {
showloading = false;
showPupub = false;
showSuccessToast = false;
showErrorToast = false;
errorValue: any = "error";
successValue: any = "success";
_pubsub: PubSubService;
constructor(public http: Http, public pubsub: PubSubService) {
this._pubsub = pubsub;
}
cancel() {
this.showPupub = false;
}
confirm() {
this.showPupub = false;
this._pubsub.confirm.emit("confirm");
}
ngOnInit() {
this._pubsub.beforeRequest.subscribe(data => {
console.log(data);
this.showloading = true;
});
this._pubsub.afterRequest.subscribe(data => {
console.log(data);
this.showloading = false;
});
this._pubsub.errorToast.subscribe(data => {
console.log(data);
this.showErrorToast = true;
this.errorValue = data;
let that = this;
// setTimeout(function() {
// console.log(this);
// that.showErrorToast = false;
// }, 2000);
});
this._pubsub.successToast.subscribe(data => {
console.log(data);
this.showSuccessToast = true;
this.successValue = data;
let that = this;
setTimeout(function() {
that.showSuccessToast = false;
}, 2000);
});
this._pubsub.showPupup.subscribe(data => {
this.showPupub = true;
console.log(data);
});
this._pubsub.hidePupup.subscribe(data => {
console.log(data);
this.showPupub = false;
});
}
}
最后，我想在每个删除aip里自动拦截，并弹出提示，如果确定删除就执行，如果放弃就return
但是不知道怎么阻塞执行，欢迎交流