我正在尝试在 Angular2（Plunker 中带有 TS 的 beta 0）中实现一个具有 2 个嵌套表单的场景，每个表单都由一个组件表示。
父组件是Word，它代表假字典中的单词。子组件是WordSense's，每个都代表父单词的含义。
两个组件都使用模型驱动的表单，子表单将其模型的值绑定到使用ngModel. 这样，父组件可以轻松地将其单词的含义传递给子组件，剩下的工作由 2-way 绑定完成。
两个表单都附加了简单的自定义验证器。除其他事项外，我想禁用提交按钮，不仅在单词表单无效时，而且在其任何意义无效时。为此，我isValid为正在编辑的模型添加了一个属性，并编写了代码来观察感知表单的变化：每当发生变化时，我都会检查表单的valid属性并相应地设置模型的属性。然后，我可以轻松地在视图和代码中的父组件级别添加检查，这样我只能在两个表单都正常时发布。
为了支持自定义验证和附加逻辑，我将初始代码从基于模板的表单切换到基于模型的表单；然而，一旦我启动重构的代码，我就会收到几个No Directive annotation found错误，我不确定它们的含义。
可能我错过了一些明显的东西，但我是这里的新手。谁能给个建议？你可以在这个 plunker 找到一个 repro：http: //plnkr.co/edit/v9Dj5j5opJmonxEeotcR。以下是其中的一些基本代码：
a) 父组件：
@Component({
selector: "word",
directives: [FORM_DIRECTIVES, FORM_PROVIDERS, WordSense],
templateUrl: `
<div>
<form [ngFormModel]="wordForm"
(ngSubmit)="onSubmit(wordForm.value)"
role="form">
<div class="form-group"
[class.has-error]="!lemma.valid && lemma.touched">
<label for="lemma">lemma</label>
<input type="text" id="lemma"
maxlength="100" required spellcheck="false"
class="form-control"
placeholder="lemma"
[ngFormControl]="wordForm.controls['lemma']">
<div *ngIf="lemma.hasError('required') && lemma.touched"
class="text-danger small">lemma required</div>
<div *ngIf="lemma.hasError('lemmaValidator') && lemma.touched"
class="text-danger small">invalid lemma</div>
</div>
...
<div class="form-group">
<table class="table table-bordered">
<tbody>
<tr *ngFor="#s of senses">
<td>
<word-sense [sense]="s" [ranks]="ranks" [fields]="fields"></word-sense>
</td>
</tr>
</tbody>
</table>
</div>
...
<button type="submit"
[ngClass]="{disabled: !wordForm.valid}"
class="btn btn-primary btn-sm">save</button>
</form>
</div>
`,
inputs: [
"word"
]
})
export class Word {
private _word: IWordModel;
public set word(value: IWordModel) {
this._word = value;
this.setFormValues();
}
public get word() {
return this._word;
}
// ...
// form
public wordForm: ControlGroup;
public lemma: Control;
public language: Control;
public class: Control;
public ranks: IPair<number>[];
public senses: ISenseViewModel[];
public fields: IFieldModel[];
constructor(private formBuilder:FormBuilder) {
// ...
this.senses = [
this.createSense()
];
// ...
// build the form
this.wordForm = this.formBuilder.group({
"lemma": ["", Validators.compose([Validators.required, LemmaValidator.isValidLemma])],
"language": ["eng", Validators.required],
"class": ["s.", Validators.required],
});
this.lemma = <Control> this.wordForm.controls["lemma"];
this.language = <Control> this.wordForm.controls["language"];
this.class = <Control> this.wordForm.controls["class"];
// ...
}
}
b) 子组件：
@Component({
selector: "word-sense",
directives: [FORM_DIRECTIVES],
template: `
<form class="form-inline" role="form" [ngFormModel]="senseForm">
<div class="form-group"
[class.has-error]="!definitionCtl.valid">
<input type="text"
class="form-control"
placeholder="definition"
[ngFormControl]="definitionCtl"
[(ngModel)]="sense.definition">
</div>
<div class="form-group"
[class.has-error]="!yearCtl.valid">
<input type="number"
class="form-control"
placeholder="date"
[ngFormControl]="yearCtl"
[(ngModel)]="sense.year">
</div>
...
</form>
`,
inputs: [
"sense",
"ranks",
"fields"
]
})
export class WordSense {
// model being edited
public sense: ISenseViewModel;
// lookup data
public ranks: IPair<number>[];
public fields: IFieldModel[];
public field: IFieldModel;
// form
public senseForm: ControlGroup;
public definitionCtl: Control;
public yearCtl: Control;
public rankCtl: Control;
public fieldsCtl: Control;
constructor(private formBuilder: FormBuilder) {
this.senseForm = this.formBuilder.group({
"definition": ["", Validators.required],
"year": [0, Validators.compose([Validators.required, YearValidator.isValidYear])],
"rank": [{value: 2, label: "media"}, Validators.required],
"fields": [""]
});
this.definitionCtl = <Control> this.senseForm.controls["definition"];
this.yearCtl = <Control> this.senseForm.controls["year"];
this.rankCtl = <Control> this.senseForm.controls["rank"];
this.fieldsCtl = <Control> this.senseForm.controls["fields"];
}
// ...
}