我试图在Angular2(在Plunker中使用TS的beta 0)中实现一个具有2个嵌套表单的场景,每个嵌套表单由一个组件表示。
父组件是Word
,表示假字典中的单词。子组件是WordSense
,每个组件代表父语词的意义。
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意义传递给子组件,其余的是双向绑定。
简单的自定义验证器附加到两个表单。除此之外,我不仅要在单词表单无效时禁用提交按钮,还要在其任何感官无效时禁用提交按钮。为此,我向正在编辑的模型添加了isValid
属性,并使用代码来观察意义形式的变化:每当发生更改时,我都会检查表单的valid
属性并设置相应的模型的属性。然后,我可以在视图和代码中的父组件级别轻松添加一个检查,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,我就会得到几个 No Directive annotation found 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。以下是一些基本代码:
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"];
}
// ...
}
答案 0 :(得分:0)
要获得更多可读错误,您可以将Angular2 .min.js
文件更改为.dev.js
个。
执行此操作,您现在遇到以下错误:
在FormBuilder上找不到指令注释
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,您为templateUrl
组件使用template
而不是Word
:
@Component({
selector: "word",
directives: [FORM_DIRECTIVES,WordSense],
templateUrl: ` <----------
`
(...)
你应该改用:
@Component({
selector: "word",
directives: [FORM_DIRECTIVES,WordSense],
template: ` <----------
`
(...)
以下是重构的plunkr:http://plnkr.co/edit/x0d5oiW1J9C2JrJG8NdT?p=preview。
希望它可以帮到你, 亨利