迁移后的模板错误 Angular 6 -> 9

Question

我刚刚从 Angular 6 迁移到 Angular 9，最重要的依赖项之一无法在 Angular 6.

上使用

我按照 ng update 中的步骤操作：

ng update
ng update rxjs
ng update @angular/cli
ng update @angular/core

问题是我现在有很多模板错误，都涉及相同的问题。

No directive found with exportAs 'ngModel'
No directive found with exportAs 'ngForm'

我在网上找不到任何与 v9 上的这些错误相关的内容（仅在 v2 上）。

以下是与错误相关的一些部分：

关于ngModel

<input type="text" class="form-control style-input-size" name="UserUpdatedUsername" [(ngModel)]="UserUpdated.username" #myKronozUserUpdatedUsername="ngModel" mdbActive required>

关于ngForm

<form #editUserForm="ngForm" (ngSubmit)="editUserForm.valid && saveUpdateUser()" novalidate class="style-form-edit-user">

FormsModule 在 app.module.ts 中很好地导入（这是应用程序内的唯一模块）。 app.module.ts:

import { FormsModule } from '@angular/forms';

@NgModule({
  imports: [FormsModule]
})
export class AppModule {
}

package.json:

  "dependencies": {
    "@agm/core": "^1.1.0",
    "@angular/animations": "^9.0.5",
    "@angular/common": "^9.0.5",
    "@angular/core": "^9.0.5",
    "@angular/forms": "^9.0.5",
    "@angular/platform-browser": "^9.0.5",
    "@angular/platform-browser-dynamic": "^9.0.5",
    "@angular/platform-server": "^9.0.5",
    "@angular/router": "^9.0.5",
    "@ngx-translate/core": "^10.0.2",
    "@ngx-translate/http-loader": "^3.0.1",
    "angular-csv-files": "^1.0.0",
    "chart.js": "2.5.x",
    "classlist.js": "1.1.x",
    "core-js": "2.4.x",
    "crypto-js": "^3.1.9-1",
    "easy-pie-chart": "2.1.x",
    "font-awesome": "4.7.x",
    "hammerjs": "2.0.x",
    "jarallax": "^1.10.3",
    "moment-timezone": "^0.5.21",
    "ng-html-util": "1.0.x",
    "ng-recaptcha": "^4.3.0",
    "ng-uikit-pro-standard": "/!\ sensible value /!\",
    "ng2-file-upload": "^1.3.0",
    "ngx-facebook": "^2.4.0",
    "ngx-pagination": "^3.2.1",
    "node-sass": "^4.13.1",
    "rxjs": "^6.5.4",
    "rxjs-compat": "^6.3.3",
    "screenfull": "3.3.x",
    "smoothscroll-polyfill": "0.3.x",
    "tslib": "^1.10.0",
    "web-animations-js": "^2.3.2",
    "zone.js": "~0.10.2"
  },
  "devDependencies": {
    "@angular/cli": "^9.0.5",
    "@angular/compiler-cli": "^9.0.5",
    "@angular/language-service": "^9.0.5",
    "@angular/compiler": "^9.0.5",
    "@types/jasmine": "2.5.38",
    "@types/node": "^12.11.1",
    "codelyzer": "^5.1.2",
    "jasmine-core": "~2.5.2",
    "jasmine-spec-reporter": "~3.2.0",
    "karma": "~1.4.1",
    "karma-chrome-launcher": "~2.0.0",
    "karma-cli": "~1.0.1",
    "karma-jasmine": "~1.1.0",
    "karma-jasmine-html-reporter": "^0.2.2",
    "karma-coverage-istanbul-reporter": "^0.2.0",
    "protractor": "~5.1.2",
    "ts-node": "~3.2.0",
    "tslint": "~5.7.0",
    "typescript": "~3.7.5",
    "webpack": "^4.3.0",
    "@angular-devkit/build-angular": "~0.900.5"
  }

我是否遗漏了一些关于迁移的信息？谢谢。

Answer 1

你收到错误是因为在 Angular 9 中删除了仅模板变量。这样做是因为它们被键入为 any 并允许突变。通常，这是一种反模式。今后，您的元素将是强类型的。

在 Angular 版本 <= 8 中，以下代码有效。 #TranslateBtn 你可以引用 translate 属性因为它被输入为 any.

<button
  #translateBtn
  (click)="translateBtn.translate = !translateBtn.translate"
>
  Translate
</button>

在Angular 9 中，#translateBtn 将是HTMLButtonElement 类型，它没有translate 属性。相反，您可以用在组件上调用函数的事件替换该功能。

HTML:

<button (click)="ontTranslate()">
  Translate
</button>

TS:

export class PeopleListComponent {
  translateToWookiee = false;

  onTranslate(): void {
    this.translateToWookiee = !this.translateToWookiee;
  }
}

我的回答来自这个博客 article 来自 Brian Love，Google Angular 和 Web 技术的开发专家。

Answer 2

建议按照官方指导：https://update.angular.io/.

建议先更新到版本8，再更新到版本9。

遵循此模式，应使用 Angular 原理图工具自动处理所有不兼容性。

迁移后的模板错误 Angular 6 -> 9

Template errors after migration Angular 6 -> 9

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