Question

我一直在努力使Angular元素组件正常工作，因为我正在考虑在即将到来的项目中使用它们。

我遵循了许多教程（都非常相似），但无法使其正常工作。教程之一是this one。

我在Elements项目中有以下package.json

        {
      "name": "angular-webcomponents-demo",
      "version": "0.0.0",
      "scripts": {
        "ng": "ng",
        "start": "ng serve",
        "build": "ng build",
        "test": "ng test",
        "lint": "ng lint",
        "e2e": "ng e2e",
        "build:elements": "ng build --prod --output-hashing none && node build-script.js"
      },
      "private": true,
      "dependencies": {
        "@angular/animations": "~7.2.0",
        "@angular/common": "~7.2.0",
        "@angular/compiler": "~7.2.0",
        "@angular/core": "~7.2.0",
        "@angular/elements": "^7.2.15",
        "@angular/forms": "~7.2.0",
        "@angular/platform-browser": "~7.2.0",
        "@angular/platform-browser-dynamic": "~7.2.0",
        "@angular/router": "~7.2.0",
        "core-js": "^2.5.4",
        "rxjs": "~6.3.3",
        "tslib": "^1.9.0",
        "zone.js": "~0.8.26",
        "document-register-element": "^1.7.2"
      },
      "devDependencies": {
        "@angular-devkit/build-angular": "~0.13.0",
        "@angular/cli": "~7.3.8",
        "@angular/compiler-cli": "~7.2.0",
        "@angular/language-service": "~7.2.0",
        "@types/jasmine": "~2.8.8",
        "@types/jasminewd2": "~2.0.3",
        "@types/node": "~8.9.4",
        "codelyzer": "~4.5.0",
        "concat": "^1.0.3",
        "fs-extra": "^8.1.0",
        "jasmine-core": "~2.99.1",
        "jasmine-spec-reporter": "~4.2.1",
        "karma": "~4.0.0",
        "karma-chrome-launcher": "~2.2.0",
        "karma-coverage-istanbul-reporter": "~2.0.1",
        "karma-jasmine": "~1.1.2",
        "karma-jasmine-html-reporter": "^0.2.2",
        "protractor": "~5.4.0",
        "ts-node": "~7.0.0",
        "tslint": "~5.11.0",
        "typescript": "~3.2.2"
      }
    }

我按照指示使用npm un build:elements进行了构建，然后尝试使用可能的最简单的html托管

即

<head>
  <meta charset="UTF-8">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <meta http-equiv="X-UA-Compatible" content="ie=edge">
  <title>Document</title>
  <script src="analytics-counter.js"></script>
</head>

<body>
  <analytics-counter></analytics-counter>
</body>
</html>

最初，我遇到类似于this post的错误（除了我提到的custom-root而不是'app-root'。

我已从引导程序中删除了该组件，因此现在我的app.module.ts中有以下内容

import { BrowserModule } from '@angular/platform-browser';
import { NgModule } from '@angular/core';
import { Injector } from '@angular/core';
import { createCustomElement } from '@angular/elements';
import { AppComponent } from './app.component';
import { AnalyticsCounterComponent } from './analytics-counter/analytics-counter.component';

@NgModule({
  declarations: [
    AppComponent,
    AnalyticsCounterComponent
  ],
  imports: [
    BrowserModule
  ],
  entryComponents: [
    AnalyticsCounterComponent
  ],
  providers: []  
})
export class AppModule {
  constructor(private injector: Injector) {     
  }
  ngDoBootstrap() {    
    const el = createCustomElement(AnalyticsCounterComponent, { injector: this.injector });
    customElements.define('analytics-counter', el);
  }
}

我从index.html中删除了<custom-root>，也看到了推荐的elswhere

我现在遇到的错误是

Uncaught TypeError: Failed to construct 'HTMLElement': Please use the 'new' operator, this DOM object constructor cannot be called as a function.
        at t [as constructor] (analytics-counter.js:4)
        at new t (analytics-counter.js:4)
        at CustomElementRegistry.e.<computed> [as define] (analytics-counter.js:2)
        at new e (analytics-counter.js:4)
        at analytics-counter.js:4
        at Mo (analytics-counter.js:4)
        at analytics-counter.js:4
        at new e (analytics-counter.js:4)
        at Object.ti [as createNgModuleRef] (analytics-counter.js:4)
        at t.create (analytics-counter.js:4)

所有的教程和说明都非常直观，但是我无法获得最基本的示例。

有人有什么主意吗？

在此先感谢您的帮助。

Answer 1

我能够重现您的错误。问题来自typedef struct _OpcUa_Argument { OpcUa_String Name; OpcUa_NodeId DataType; OpcUa_Int32 ValueRank; OpcUa_Int32 NoOfArrayDimensions; OpcUa_UInt32* ArrayDimensions; OpcUa_LocalizedText Description; } OpcUa_Argument;。您将必须对其进行修改，并确保它仅编译build-script.js个文件，而不是es2015.js个文件。 ES5在使用本机Custom Elements时遇到一些麻烦，因此您将不得不使用ES2015。

所以它看起来像这样：

es5.js

也可以随时检查我的Angular Elements演示存储库-Angular Custom Elements。输出已经在const files = [ './dist/CustomElements/runtime-es2015.js', './dist/CustomElements/polyfills-es2015.js', './dist/CustomElements/main-es2015.js' ];文件夹中，因此您可以在此处运行elements/进行测试。通过在此确切项目的构建脚本中将es2015替换为es5，我能够重现该错误。

Angular Elements-未捕获的TypeError：无法构造“ HTMLElement”

1 个答案: