问题是在路由中我必须单击两次才能触发ngOnInit代码.
奇怪的是,如果我有两条路线：A和B,我先点击A,它只会触发构造函数,如果我在它之后点击B,它会在调用B的构造函数之前触发A的onInit.
使用角度2.0.0-rc.4并路由3.0.0-beta.2
页面加载时显示错误：
vendors.js:2291 Unhandled promise rejection Error: Cannot match any routes: ''
at Observable._subscribe (http://localhost:54037/js/app.js:19280:28)
at Observable.subscribe (http://localhost:54037/js/app.js:56291:60)
at Observable._subscribe (http://localhost:54037/js/app.js:56328:26)
at MergeMapOperator.call (http://localhost:54037/js/app.js:26178:21)
at Observable.subscribe (http://localhost:54037/js/app.js:56291:36)
at Observable._subscribe (http://localhost:54037/js/app.js:56328:26)
at MergeMapOperator.call (http://localhost:54037/js/app.js:26178:21)
at Observable.subscribe (http://localhost:54037/js/app.js:56291:36)
at Observable._subscribe (http://localhost:54037/js/app.js:56328:26)
at MapOperator.call (http://localhost:54037/js/app.js:56831:21)
gulp文件
/// <binding Clean='default, clean, resources' />
/*
This file in the main entry point for defining Gulp tasks and using Gulp plugins.
Click here to learn more. http://go.microsoft.com/fwlink/?LinkId=518007
*/
var gulp = require('gulp');
var sourcemaps = require('gulp-sourcemaps');
var concat = require('gulp-concat');
var uglify = require('gulp-uglify');
var typescript = require('gulp-typescript');
var systemjsBuilder = require('systemjs-builder');
const del = require("del");
// Compile TypeScript app to JS
gulp.task('compile:ts', function () {
return gulp
.src([
"appTS/**/*.ts",
"typings/*.d.ts"
])
.pipe(sourcemaps.init())
.pipe(typescript({
"module": "system",
"moduleResolution": "node",
"outDir": "app",
"target": "ES5"
}))
.pipe(sourcemaps.write('.'))
.pipe(gulp.dest('app'));
});
// Generate systemjs-based bundle (app/app.js)
gulp.task('bundle:app', function () {
var builder = new systemjsBuilder('./', './system.config.js');
return builder.buildStatic('app', 'wwwroot/js/app.js');
});
// Copy and bundle dependencies into one file (vendor/vendors.js)
// system.config.js can also bundled for convenience
gulp.task('bundle:vendor', function () {
return gulp.src([
'node_modules/core-js/client/shim.min.js',
'node_modules/systemjs/dist/system-polyfills.js',
'node_modules/reflect-metadata/Reflect.js',
'node_modules/zone.js/dist/zone.js',
'node_modules/systemjs/dist/system.js',
'system.config.js'
])
.pipe(concat('vendors.js'))
.pipe(gulp.dest('build'));
});
// Copy dependencies loaded through SystemJS into dir from node_modules
gulp.task('copy:vendor', function () {
return gulp.src([
'node_modules/rxjs/bundles/Rx.js',
'node_modules/@angular/**/*'
])
.pipe(gulp.dest('build'));
});
gulp.task('vendor', ['bundle:vendor', 'copy:vendor']);
gulp.task('app', ['compile:ts', 'bundle:app']);
// Bundle dependencies and app into one file (app.bundle.js)
gulp.task('bundle', ['vendor', 'app'], function () {
return gulp.src([
'build/app.js',
'build/vendors.js'
])
.pipe(concat('app.bundle.js'))
.pipe(gulp.dest('wwwroot/js/app'));
});
/**
* Copy all resources that are not TypeScript files into build directory.
*/
gulp.task("resources", () => {
return gulp.src(["Scripts/app/**/*", "!**/*.ts"])
.pipe(gulp.dest("wwwroot/app"));
});
/**
* Remove build directory.
*/
gulp.task('clean', (cb) => {
return del(["build"], cb);
});
gulp.task('default', ['bundle']);
app.routes
import { provideRouter, RouterConfig } from '@angular/router';
import { MediaItemFormComponent } from './media-item-form.component';
import { MediaItemListComponent } from './media-item-list.component';
export const routes: RouterConfig = [
{ path: 'list', component: MediaItemListComponent },
{ path: 'add', component: MediaItemFormComponent }
];
export const APP_ROUTER_PROVIDERS = [
provideRouter(routes)
];
列表组件
import {Component, Inject, OnInit } from '@angular/core';
import 'rxjs/Rx';
import {MediaItemComponent} from './media-item.component';
import {CategoryListPipe} from './category-list.pipe';
import {MediaItemService} from './media-item.service';
@Component({
selector: 'media-item-list',
directives: [MediaItemComponent],
pipes: [CategoryListPipe],
providers: [MediaItemService],
templateUrl: 'app/media-item-list.component.html',
styleUrls: ['app/media-item-list.component.css']
})
export class MediaItemListComponent implements OnInit {
mediaItems;
constructor(private mediaItemService: MediaItemService) {
console.log("constructor MediaItemList");
}
ngOnInit() {
console.log("ngOnInit MediaItemList");
this.getMediaItem();
}
onMediaItemDeleted(mediaItem) {
this.mediaItemService.delete(mediaItem)
.subscribe(() => {
this.getMediaItem();
});
}
getMediaItem() {
this.mediaItemService.get().subscribe(mediaitems => {
this.mediaItems = mediaitems;
},
function (error) { console.log("Error happened" + error) },
function () {
}
);
}
}
system.js
// map tells the System loader where to look for things
var map = {
'app': 'Scripts/app',
'rxjs': 'node_modules/rxjs',
'@angular': 'node_modules/@angular'
};
// packages tells the System loader how to load when no filename and/or no extension
var packages = {
'app': { main: 'main', defaultExtension: 'js' },
'rxjs': { defaultExtension: 'js' },
};
var packageNames = [
'@angular/common',
'@angular/compiler',
'@angular/core',
'@angular/forms',
'@angular/http',
'@angular/platform-browser',
'@angular/platform-browser-dynamic',
'@angular/router',
'@angular/testing',
'@angular/upgrade',
];
// add package entries for angular packages in the form '@angular/common': { main: 'index.js', defaultExtension: 'js' }
packageNames.forEach(function (pkgName) {
packages[pkgName] = { main: 'index.js', defaultExtension: 'js' };
});
System.config({
map: map,
packages: packages
});
的index.html
<html>
<head>
<title>MeWL</title>
<meta name="viewport" content="width=device-width, initial-scale=1">
<base href="/" />
<link href="resets.css" rel="stylesheet">
<script src="js/vendors.js"></script>
<script src="js/app.js"></script>
<style>
body {
margin: 0px;
padding: 0px;
background-color: #32435b;
}
</style>
</head>
<body>
<media-tracker-app>Loading...</media-tracker-app>
</body>
</html>
更新：
如果有帮助的话,我会包含列表的html和嵌套在里面的组件
<media-item
*ngFor="let mediaItem of mediaItems"
[mediaItemToWatch] ="mediaItem"
(deleted)="onMediaItemDeleted($event)"
[ngClass]="{'medium-movies': mediaItem.medium === 'Movies', 'medium- series' : mediaItem.medium === 'Series'}" ></media-item>
MediaItem html：
<h2>{{mediaItem.name }}</h2>
<div>{{mediaItem.category}}</div>
<div>{{mediaItem.year}}</div>
<div class="tools">
<a class="delete" (click)="onDelete()">
remove
</a>
<a class="details">
watch
</a>
</div>
媒体项目ts：
import {Component, Input, Output, EventEmitter} from '@angular/core';
import {FavoriteDirective} from './favorite.directive';
@Component({
selector: 'media-item',
directives: [FavoriteDirective],
templateUrl: 'app/media-item.component.html',
styleUrls: ['app/media-item.component.css']
})
export class MediaItemComponent {
@Input('mediaItemToWatch') mediaItem;
@Output('deleted') delete = new EventEmitter();
onDelete() {
this.delete.emit(this.mediaItem);
}
}
解决方法:
它似乎
vendors.js:2291 Unhandled promise rejection Error: Cannot match any routes: ”
导致更改检测不运行
为避免此错误,请为“路径”添加路径
{ path: '', redirectTo: '/list', pathMatch: 'full' }
要么
{ path: '', component: DummyComponent, pathMatch: 'full' }
原文地址：https://codeday.me/bug/20190702/1353741.html
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