我开发了一个angular 4应用程序，并将数据绑定(bind)到表单时遇到了问题。绑定(bind)代码似乎很好，并且不确定问题出在哪里。当我调试应用程序时，可以看到以下代码行this.editMovieForm = result;正确地填充了结果。在setFormValues()方法中。当我检查控制台窗口时，看到以下错误
EditmovieComponent.html:1 ERROR TypeError: _this.form.get is not a function
at forms.es5.js:4907
at Array.forEach (<anonymous>)
at FormGroupDirective.webpackJsonp.../../../forms/@angular/forms.es5.js.FormGroupDirective._updateDomValue (forms.es5.js:4906)
at FormGroupDirective.webpackJsonp.../../../forms/@angular/forms.es5.js.FormGroupDirective.ngOnChanges (forms.es5.js:4774)
at checkAndUpdateDirectiveInline (core.es5.js:10840)
at checkAndUpdateNodeInline (core.es5.js:12341)
at checkAndUpdateNode (core.es5.js:12284)
at debugCheckAndUpdateNode (core.es5.js:13141)
at debugCheckDirectivesFn (core.es5.js:13082)
at Object.eval [as updateDirectives] (EditmovieComponent.html:1)
ERROR Error: Uncaught (in promise): TypeError: _this.editMovieForm.patchValue is not a function
TypeError: _this.editMovieForm.patchValue is not a function
at main.bundle.js:446
at ZoneDelegate.webpackJsonp.../../../../zone.js/dist/zone.js.ZoneDelegate.invoke (polyfills.bundle.js:2908)
at Object.onInvoke (vendor.bundle.js:146628)
at ZoneDelegate.webpackJsonp.../../../../zone.js/dist/zone.js.ZoneDelegate.invoke (polyfills.bundle.js:2907)
at Zone.webpackJsonp.../../../../zone.js/dist/zone.js.Zone.run (polyfills.bundle.js:2658)
at polyfills.bundle.js:3389
at ZoneDelegate.webpackJsonp.../../../../zone.js/dist/zone.js.ZoneDelegate.invokeTask (polyfills.bundle.js:2941)
at Object.onInvokeTask (vendor.bundle.js:146619)
at ZoneDelegate.webpackJsonp.../../../../zone.js/dist/zone.js.ZoneDelegate.invokeTask (polyfills.bundle.js:2940)
at Zone.webpackJsonp.../../../../zone.js/dist/zone.js.Zone.runTask (polyfills.bundle.js:2708)
at main.bundle.js:446
at ZoneDelegate.webpackJsonp.../../../../zone.js/dist/zone.js.ZoneDelegate.invoke (polyfills.bundle.js:2908)
at Object.onInvoke (vendor.bundle.js:146628)
at ZoneDelegate.webpackJsonp.../../../../zone.js/dist/zone.js.ZoneDelegate.invoke (polyfills.bundle.js:2907)
at Zone.webpackJsonp.../../../../zone.js/dist/zone.js.Zone.run (polyfills.bundle.js:2658)
at polyfills.bundle.js:3389
at ZoneDelegate.webpackJsonp.../../../../zone.js/dist/zone.js.ZoneDelegate.invokeTask (polyfills.bundle.js:2941)
at Object.onInvokeTask (vendor.bundle.js:146619)
at ZoneDelegate.webpackJsonp.../../../../zone.js/dist/zone.js.ZoneDelegate.invokeTask (polyfills.bundle.js:2940)
at Zone.webpackJsonp.../../../../zone.js/dist/zone.js.Zone.runTask (polyfills.bundle.js:2708)
at resolvePromise (polyfills.bundle.js:3340)
at polyfills.bundle.js:3392
at ZoneDelegate.webpackJsonp.../../../../zone.js/dist/zone.js.ZoneDelegate.invokeTask (polyfills.bundle.js:2941)
at Object.onInvokeTask (vendor.bundle.js:146619)
at ZoneDelegate.webpackJsonp.../../../../zone.js/dist/zone.js.ZoneDelegate.invokeTask (polyfills.bundle.js:2940)
at Zone.webpackJsonp.../../../../zone.js/dist/zone.js.Zone.runTask (polyfills.bundle.js:2708)
at drainMicroTaskQueue (polyfills.bundle.js:3118)
at ZoneTask.webpackJsonp.../../../../zone.js/dist/zone.js.ZoneTask.invokeTask [as invoke] (polyfills.bundle.js:3019)
at invokeTask (polyfills.bundle.js:4056)
at XMLHttpRequest.globalZoneAwareCallback (polyfills.bundle.js:4082)
editmovie.component.ts
import { Component, OnInit } from '@angular/core';
import {Router,ActivatedRoute,Params} from '@angular/router';
import {FormGroup,FormControl,FormBuilder} from '@angular/forms';
import {IMovie} from '../movie.interface';
import {MovieService} from '../movie.service';
@Component({
selector: 'app-editmovie',
moduleId: module.id,
templateUrl: './editmovie.component.html',
styleUrls: ['./editmovie.component.css'],
providers:[MovieService]
})
export class EditmovieComponent implements OnInit {
public selectMovieId: number = 0;
public sub : any;
public editMovieForm: FormGroup;
public movie: IMovie;
constructor(private _route: ActivatedRoute,
private fb: FormBuilder,
private movieService : MovieService ) {
this.initializeFormModel();
}
ngOnInit() {
this.sub = this._route.params.subscribe(params => {
this.selectMovieId = + params['id']; // (+) converts string to number
});
this.initializeFormModel();
if(this.selectMovieId && this.selectMovieId > 0) {
this.setFormValues();
}
}
initializeFormModel()
{
this.editMovieForm = this.fb.group({
movieId : [''],
title: [''],
releaseYear: [''],
plot: [''],
movieLength: ['']
})
}
setFormValues(){
var existingMovie: IMovie;
this.movieService.getMovie(this.selectMovieId).then((result: any)=> {
existingMovie = result;
this.movie = existingMovie;
this.editMovieForm = result;
this.editMovieForm.patchValue(existingMovie, { onlySelf: true });
});
}
}
editmovie.component.html
<form [formGroup] = "editMovieForm">
<div class ="col-sm-12">
<div class="form-group col-sm-6">
<label for="movie-title" class="control-label">Title</label>
<input type="text" class="form-control" id= "movie-title" placeholder="Title of Movie" formControlName="title" maxlength="100">
</div>
<div class="form-group col-sm-6">
<label for="release-year" class="control-label">Release Year</label>
<input type="text" class="form-control" id="release-year" placeholder="Release Year" formControlName="releaseYear" maxlength="4">
</div>
</div>
<div class ="col-sm-12">
<div class="form-group col-sm-6">
<label for="movie-plot" class="control-label">Plot</label>
<input type="text" class="form-control" id= "movie-plot" placeholder="Plot" formControlName="plot" maxlength="100">
</div>
<div class="form-group col-sm-6">
<label for="movie-length" class="control-label">Movile Length</label>
<input type="text" class="form-control" id= "movie-length" placeholder="Movie Length" formControlName="movieLength" maxlength="100">
</div>
</div>
</form>
最佳答案
根据您的问题，
我认为以粗体显示该错误。
FormBuilder会按以下方式创建editMovieForm，并且我假设有大量方法要添加到实例对象中，以使其运行所需。
this.editMovieForm = this.fb.group({
movieId : [''],
title: [''],
releaseYear: [''],
plot: [''],
movieLength: ['']
})
但是，您正在将
movieService.getMovie()的结果分配给该变量。我大胆猜测
result不是FormGroup对象，如果这样的话，它不再具有这样的功能也就不足为奇了。this.movieService.getMovie(this.selectMovieId).then((result: any)=> {
...
this.editMovieForm = result;
...
});
请尝试注释掉该行，看看错误是否消失。
我想您会发现
patchValue后面的行是将结果添加到表单中所需要的全部。this.editMovieForm.patchValue(existingMovie, { onlySelf: true });
引用Updating Angular 2 Forms with patchValue or setValue
关于angular - _this.form.get不是angular4中的函数，我们在Stack Overflow上找到一个类似的问题：https://stackoverflow.com/questions/47398802/