我正在我的应用程序中使用Angular Material中的Stepper组件，我需要在其中支持IE 11。
如果我使用IE浏览到documentation page，所有示例都运行良好，因此看起来确实可以在IE中使用。
因此，我创建了一个新的Angular项目，并使用ng add @angular/material添加了Material。
我有以下软件包
{
"name": "mat-stepper1",
"version": "0.0.0",
"scripts": {
"ng": "ng",
"start": "ng serve",
"build": "ng build",
"test": "ng test",
"lint": "ng lint",
"e2e": "ng e2e"
},
"private": true,
"dependencies": {
"@angular/animations": "~7.2.0",
"@angular/cdk": "~7.3.7",
"@angular/common": "~7.2.0",
"@angular/compiler": "~7.2.0",
"@angular/core": "~7.2.0",
"@angular/forms": "~7.2.0",
"@angular/material": "^7.3.7",
"@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"
},
"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/node": "~8.9.4",
"@types/jasmine": "~2.8.8",
"@types/jasminewd2": "~2.0.3",
"codelyzer": "~4.5.0",
"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"
}
}
tsconfig.json中的无JS目标是"target": "es5",
我的应用程序模块如下...
import { BrowserModule } from '@angular/platform-browser';
import { NgModule } from '@angular/core';
import { AppComponent } from './app.component';
import { BrowserAnimationsModule } from '@angular/platform-browser/animations';
import { WizardStepperComponent } from './wizard-stepper/wizard-stepper.component';
import { MatStepperModule, MatInputModule, MatButtonModule, MatAutocompleteModule } from '@angular/material';
@NgModule({
declarations: [
AppComponent,
WizardStepperComponent
],
imports: [
BrowserModule,
BrowserAnimationsModule,
MatStepperModule,
MatInputModule,
MatButtonModule,
MatAutocompleteModule
],
providers: [],
bootstrap: [AppComponent]
})
export class AppModule { }
最后，我用以下内容创建了一个组件。
<mat-horizontal-stepper #stepper>
<mat-step>
Step 1
</mat-step>
<mat-step>
Step 2
</mat-step>
<mat-step>
Step 3
</mat-step>
<!-- one option -->
</mat-horizontal-stepper>
<!-- second option -->
<div>
<button (click)="goBack(stepper)" type="button" [disabled]="stepper.selectedIndex === 0">Back</button>
<button (click)="goForward(stepper)" type="button"
[disabled]="stepper.selectedIndex === stepper._steps.length-1">Next</button>
<!-- using totalStepsCount -->
<!-- <button (click)="goForward(stepper)" type="button" [disabled]="stepper.selectedIndex === totalStepsCount-1">Next</button> -->
</div>
import { Component, OnInit, ViewChild } from '@angular/core';
import { MatStepper } from '@angular/material';
@Component({
selector: 'app-wizard-stepper',
templateUrl: './wizard-stepper.component.html',
styleUrls: ['./wizard-stepper.component.scss']
})
export class WizardStepperComponent implements OnInit {
@ViewChild('stepper') private myStepper: MatStepper;
totalStepsCount: number;
constructor() { }
public ngOnInit() : void {
}
public ngAfterViewInit() : void {
this.totalStepsCount = this.myStepper._steps.length;
}
public goBack(stepper: MatStepper) : void {
stepper.previous();
}
public goForward(stepper: MatStepper) : void {
stepper.selectedIndex = 2;
}
}
所有功能都可以在Chrome，Edge，Firefox中正常运行，但是当我在IE中尝试时，出现以下错误。...
Unhandled Promise rejection: 'customElements' is undefined ; Zone: <root> ; Task: Promise.then ; Value: ReferenceError: 'customElements' is undefined ReferenceError: 'customElements' is undefined
at AppComponent (http://localhost:4200/main.js:85:9)
at createClass (http://localhost:4200/vendor.js:63022:13)
at createDirectiveInstance (http://localhost:4200/vendor.js:62899:5)
at createViewNodes (http://localhost:4200/vendor.js:71259:21)
at createRootView (http://localhost:4200/vendor.js:71173:5)
at callWithDebugContext (http://localhost:4200/vendor.js:72181:9)
at debugCreateRootView (http://localhost:4200/vendor.js:71691:5)
at ComponentFactory_.prototype.create (http://localhost:4200/vendor.js:62378:9)
at ComponentFactoryBoundToModule.prototype.create (http://localhost:4200/vendor.js:60100:9)
at ApplicationRef.prototype.bootstrap (http://localhost:4200/vendor.js:68946:9)
"Unhandled Promise rejection:"
"'customElements' is undefined"
"; Zone:"
"<root>"
"; Task:"
"Promise.then"
"; Value:"
{
[functions]: ,
__proto__: { },
description: "'customElements' is undefined",
message: "'customElements' is undefined",
name: "ReferenceError",
ngDebugContext: { },
number: -2146823279,
stack: "ReferenceError: 'customElements' is undefined
at AppComponent (http://localhost:4200/main.js:85:9)
at createClass (http://localhost:4200/vendor.js:63022:13)
at createDirectiveInstance (http://localhost:4200/vendor.js:62899:5)
at createViewNodes (http://localhost:4200/vendor.js:71259:21)
at createRootView (http://localhost:4200/vendor.js:71173:5)
at callWithDebugContext (http://localhost:4200/vendor.js:72181:9)
at debugCreateRootView (http://localhost:4200/vendor.js:71691:5)
at ComponentFactory_.prototype.create (http://localhost:4200/vendor.js:62378:9)
at ComponentFactoryBoundToModule.prototype.create (http://localhost:4200/vendor.js:60100:9)
at ApplicationRef.prototype.bootstrap (http://localhost:4200/vendor.js:68946:9)",
Symbol()_g.y4outqxtpgv: undefined,
Symbol(rxSubscriber)_h.y4outqxtpgv: undefined
}
"ReferenceError: 'customElements' is undefined
at AppComponent (http://localhost:4200/main.js:85:9)
at createClass (http://localhost:4200/vendor.js:63022:13)
at createDirectiveInstance (http://localhost:4200/vendor.js:62899:5)
at createViewNodes (http://localhost:4200/vendor.js:71259:21)
at createRootView (http://localhost:4200/vendor.js:71173:5)
at callWithDebugContext (http://localhost:4200/vendor.js:72181:9)
at debugCreateRootView (http://localhost:4200/vendor.js:71691:5)
at ComponentFactory_.prototype.create (http://localhost:4200/vendor.js:62378:9)
at ComponentFactoryBoundToModule.prototype.create (http://localhost:4200/vendor.js:60100:9)
at ApplicationRef.prototype.bootstrap (http://localhost:4200/vendor.js:68946:9)"
在这一阶段，我没有添加多余的polyfill，也没有对polyfills.ts中的任何内容进行注释
有什么想法可以使它在IE中正常工作吗？
转到Sample code，我看不到他们如何在doco页面上正常工作的任何事情。
在此先感谢您的帮助
[UPDATE1]
我的polyfills.ts具有以下内容
/**
* This file includes polyfills needed by Angular and is loaded before the app.
* You can add your own extra polyfills to this file.
*
* This file is divided into 2 sections:
* 1. Browser polyfills. These are applied before loading ZoneJS and are sorted by browsers.
* 2. Application imports. Files imported after ZoneJS that should be loaded before your main
* file.
*
* The current setup is for so-called "evergreen" browsers; the last versions of browsers that
* automatically update themselves. This includes Safari >= 10, Chrome >= 55 (including Opera),
* Edge >= 13 on the desktop, and iOS 10 and Chrome on mobile.
*
* Learn more in https://angular.io/guide/browser-support
*/
/***************************************************************************************************
* BROWSER POLYFILLS
*/
/** IE10 and IE11 requires the following for NgClass support on SVG elements */
// import 'classlist.js'; // Run `npm install --save classlist.js`.
/**
* Web Animations `@angular/platform-browser/animations`
* Only required if AnimationBuilder is used within the application and using IE/Edge or Safari.
* Standard animation support in Angular DOES NOT require any polyfills (as of Angular 6.0).
*/
// import 'web-animations-js'; // Run `npm install --save web-animations-js`.
/**
* By default, zone.js will patch all possible macroTask and DomEvents
* user can disable parts of macroTask/DomEvents patch by setting following flags
* because those flags need to be set before `zone.js` being loaded, and webpack
* will put import in the top of bundle, so user need to create a separate file
* in this directory (for example: zone-flags.ts), and put the following flags
* into that file, and then add the following code before importing zone.js.
* import './zone-flags.ts';
*
* The flags allowed in zone-flags.ts are listed here.
*
* The following flags will work for all browsers.
*
* (window as any).__Zone_disable_requestAnimationFrame = true; // disable patch requestAnimationFrame
* (window as any).__Zone_disable_on_property = true; // disable patch onProperty such as onclick
* (window as any).__zone_symbol__BLACK_LISTED_EVENTS = ['scroll', 'mousemove']; // disable patch specified eventNames
*
* in IE/Edge developer tools, the addEventListener will also be wrapped by zone.js
* with the following flag, it will bypass `zone.js` patch for IE/Edge
*
* (window as any).__Zone_enable_cross_context_check = true;
*
*/
/***************************************************************************************************
* Zone JS is required by default for Angular itself.
*/
import 'zone.js/dist/zone'; // Included with Angular CLI.
/***************************************************************************************************
* APPLICATION IMPORTS
*/
答案 0 :(得分：1)
这里的解决方案是仅在polyfills.ts中安装以下内容并取消注释。.
import 'classlist.js'; // Run `npm install --save classlist.js`.
import 'web-animations-js'; // Run `npm install --save web-animations-js`.
我认为它们在这里不相关，但是一旦包括了，步进器现在可以在IE中使用！将来我不会guess，而只会do。