typescript – Angular2 beta:嵌套基于表单的父/子组件并从父级验证

我试图在Angular2(在Plunker中使用TS的beta 0)中实现一个具有2个嵌套形式的场景,每个嵌套形式由一个组件表示.

父组件是Word,它表示假字典中的单词.子组件是WordSense,每个组件代表父词的意义.

两个组件都使用模型驱动的表单,子表单绑定其模型的值以使用ngModel形成控件.通过这种方式,父组件可以轻松地将其单词的感官传递给子组件,其余的是双向绑定.

简单的自定义验证器附加到两个表单.除其他事项外,我不仅要在单词表单无效时禁用提交按钮,还要在其任何感知无效时禁用.为此,我向正在编辑的模型添加了一个isValid属性,并在代码中添加了感知形式的变化:每当发生更改时,我都会检查表单的有效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一个检查,这样我只有在两个表单都正常时才能发布.

为了支持自定义验证和其他逻辑,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,一旦我启动重构代码,我就会发现几个No Directive注释发现错误,而且我不确定它们的含义.

可能我错过了一些明显的东西,但我在这里是个新手.谁能提出建议?你可以在这个plunker找到一个repro:http://plnkr.co/edit/v9Dj5j5opJmonxEeotcR.这里有一些基本的代码:

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"];
    }
    // ...
}
最佳答案
要获得更多可读错误,可以将Angular2 .min.js文件更改为.dev.js文件.

这样做,您现在有以下错误:

No Directive annotation found on FormBuilder

实际上,问题是您将FORM_PROVIDERS设置为组件的directives属性.所以它试图使用提供者作为指令,但它们不是……

@Component({
  selector: "word",
  directives: [FORM_DIRECTIVES, FORM_PROVIDERS, WordSense], <-----
  templateUrl: `
    <div>
    (...)
  `
})
export class ...

删除它应该可以解决您的问题:

@Component({
  selector: "word",
  directives: [FORM_DIRECTIVES, WordSense], <-----
  templateUrl: `
    <div>
    (...)
  `
})
export class ...

另一个问题是您使用templateUrl而不是Word组件的模板:

@Component({
  selector: "word",
  directives: [FORM_DIRECTIVES,WordSense],
  templateUrl: ` <----------
  `
  (...)

您应该使用此代替:

@Component({
  selector: "word",
  directives: [FORM_DIRECTIVES,WordSense],
  template: ` <----------
  `
  (...)

这是重构的plunkr:http://plnkr.co/edit/x0d5oiW1J9C2JrJG8NdT?p=preview.

希望它能帮到你,
蒂埃里

转载注明原文:typescript – Angular2 beta:嵌套基于表单的父/子组件并从父级验证 - 代码日志