这是我为单页 Web 应用程序编写的简单 HTML
<div class="bg">
<h1 class="faq_heading">Frequently Asked Questions</h1>
<div class="search">
<mat-form-field class="search_input">
<input type="text" placeholder="Search" class="search_input" matInput [(ngModel)]="inp" (keyup)="onKey($event)" />
</mat-form-field>
<mat-form-field>
<mat-label>Categories</mat-label>
<mat-select class="dropdown" placeholder="Categories">
<mat-option value="Default">Default</mat-option>
</mat-select>
</mat-form-field>
<img src="../assets/images/search.svg" alt="" class="search_img" />
</div>
</div>
component.ts 文件中没有什么,只有基本模板和所需的导入语句
以下是 app.module.ts
import { NgModule } from "@angular/core";
import { BrowserModule } from "@angular/platform-browser";
import { MatFormFieldModule } from "@angular/material/form-field";
import { AppRoutingModule } from "./app-routing.module";
import { AppComponent } from "./app.component";
import { MatGridListModule } from "@angular/material/grid-list";
import { MatSelectModule } from "@angular/material/select";
import { MatPaginatorModule } from "@angular/material/paginator";
import { MatDialogModule } from "@angular/material/dialog";
import { MatSnackBarModule } from "@angular/material/snack-bar";
import { BrowserAnimationsModule } from "@angular/platform-browser/animations";
import { HttpClientModule } from "@angular/common/http";
import { faqservice } from "./faq.service";
import { MatExpansionModule } from "@angular/material/expansion";
import { FormsModule } from "@angular/forms";
@NgModule({
declarations: [AppComponent],
imports: [
FormsModule,
MatExpansionModule,
HttpClientModule,
BrowserModule,
AppRoutingModule,
MatFormFieldModule,
MatGridListModule,
MatSelectModule,
MatDialogModule,
BrowserAnimationsModule,
MatSnackBarModule,
MatPaginatorModule,
],
providers: [faqservice],
bootstrap: [AppComponent],
})
export class AppModule {}
以下是错误Error1:
ERROR TypeError: Cannot read property 'controlType' of undefined
at MatFormField.ngAfterContentInit (form-field.js:527)
at callHook (core.js:2526)
at callHooks (core.js:2495)
at executeInitAndCheckHooks (core.js:2446)
at refreshView (core.js:9486)
at refreshComponent (core.js:10616)
at refreshChildComponents (core.js:9242)
at refreshView (core.js:9495)
at renderComponentOrTemplate (core.js:9559)
at tickRootContext (core.js:10790)
错误2:
ERROR TypeError: Cannot read property 'errorState' of undefined
at MatFormField_HostBindings (form-field.js:830)
at processHostBindingOpCodes (core.js:9213)
at refreshView (core.js:9491)
at refreshComponent (core.js:10616)
at refreshChildComponents (core.js:9242)
at refreshView (core.js:9495)
at renderComponentOrTemplate (core.js:9559)
at tickRootContext (core.js:10790)
at detectChangesInRootView (core.js:10815)
at RootViewRef.detectChanges (core.js:22865)
正如您所看到的,代码中没有太多内容,因为我刚刚开始开发,但我已经直接从文档中收到基本模板中的错误。如何处理这些错误?(请注意,我是角度材料的新手,如果可能的话,请在答案周围提及一些细节)
这是 package.json
{
"name": "faq1",
"version": "0.0.0",
"scripts": {
"ng": "ng",
"start": "ng serve",
"build": "ng build",
"watch": "ng build --watch --configuration development",
"test": "ng test"
},
"private": true,
"dependencies": {
"@angular/animations": "~12.1.1",
"@angular/cdk": "^12.1.1",
"@angular/common": "~12.1.1",
"@angular/compiler": "~12.1.1",
"@angular/core": "~12.1.1",
"@angular/forms": "~12.1.1",
"@angular/material": "^12.1.1",
"@angular/platform-browser": "~12.1.1",
"@angular/platform-browser-dynamic": "~12.1.1",
"@angular/router": "~12.1.1",
"rxjs": "~6.6.0",
"tslib": "^2.2.0",
"zone.js": "~0.11.4"
},
"devDependencies": {
"@angular-devkit/build-angular": "~12.1.1",
"@angular/cli": "~12.1.1",
"@angular/compiler-cli": "~12.1.1",
"@types/jasmine": "~3.6.0",
"@types/node": "^12.11.1",
"jasmine-core": "~3.7.0",
"karma": "~6.3.0",
"karma-chrome-launcher": "~3.1.0",
"karma-coverage": "~2.0.3",
"karma-jasmine": "~4.0.0",
"karma-jasmine-html-reporter": "^1.5.0",
"typescript": "~4.3.2"
}
}