Angular2、ngModel和Forms:list不';不能正确显示
我已经使用ngModel在输入中显示了一个项目数组。我在带有基本控件(必需)的表单中使用ngFor指令。列表不会正确显示:它始终是显示的数组的最后一项。 如果我使用mustache语法来显示输入之外的数组,就可以了。如果我删除表单和控件,就可以了。 您可以在此处进行测试:。 代码如下:Angular2、ngModel和Forms:list不';不能正确显示,angular,angular2-forms,Angular,Angular2 Forms,我已经使用ngModel在输入中显示了一个项目数组。我在带有基本控件(必需)的表单中使用ngFor指令。列表不会正确显示:它始终是显示的数组的最后一项。 如果我使用mustache语法来显示输入之外的数组,就可以了。如果我删除表单和控件,就可以了。 您可以在此处进行测试:。 代码如下: @Component({ selector: "my-app", providers: [], template: " <div> <form [form
@Component({
selector: "my-app",
providers: [],
template: "
<div>
<form [formGroup]="personControl">
<div *ngFor="let person of persons; let i = index">
index : {{i}}<br/>
label : {{person.label}}<br/>
value : {{person.value}}<br/>
<input type="text"
maxlength="30"
[id]="'label-'+person.id"
[(ngModel)]="person.label"
formControlName="personLabel"/>
<input type="text"
maxlength="30"
[id]="'value-'+person.id"
[(ngModel)]="person.value"
formControlName="personValue"/>
</div>
</form>
</div>
",
directives: [REACTIVE_FORM_DIRECTIVES]
})
export class App {
private personControl: FormGroup;
private persons : Person[];
constructor(private _formBuilder: FormBuilder) {
this.persons = PERSONS;
this.personControl = this._formBuilder.group({
personLabel : new FormControl("",
[
Validators.required
]),
personValue : new FormControl("",
[
Validators.required
])
});
}
}
export class Person {
id: number;
label: string;
value : number;
}
const PERSONS: Person[] = [
{ id: 1, label: "Person One", value : 10 },
{ id: 2, label: "Person Two", value : 20 },
{ id: 3, label: "Person Three", value : 30 }
];
@Component({
selector: 'my-app',
providers: [],
template: `
<div>
<form [formGroup]="personControl">
<div *ngFor="let person of persons; let i = index">
index : {{i}}<br/>
label : {{person.label}}<br/>
value : {{person.value}}<br/>
<input type="text"
maxlength="30"
[id]="'label-'+person.id"
[(ngModel)]="person.label"
[formControlName]="'personLabel'+person.id" />
<input type="text"
maxlength="30"
[id]="'value-'+person.id"
[(ngModel)]="person.value"
[formControlName]="'personValue'+person.id" />
</div>
</form>
</div>
`,
directives: [REACTIVE_FORM_DIRECTIVES]
})
export class App {
private personControl: FormGroup;
private persons : Person[];
constructor(private _formBuilder: FormBuilder) {
this.persons = PERSONS;
let ctrls = {};
this.persons.forEach(((person: Person) => {
ctrls[`personLabel${person.id}`] = new FormControl('',
[
Validators.required
]);
ctrls[`personValue${person.id}`] = new FormControl('',
[
Validators.required
]);
}).bind(this));
this.personControl = this._formBuilder.group(ctrls);
}
}
export class Person {
id: number;
label: string;
value : number;
}
const PERSONS: Person[] = [
{ id: 1, label: 'Person One', value : 10 },
{ id: 2, label: 'Person Two', value : 20 },
{ id: 3, label: 'Person Three', value : 30 }
];
@组件({
选择器:“我的应用程序”,
提供者:[],
模板:“
索引:{{i}}
标签:{{person.label}}
值:{{person.value}}
",
指令:[反应形式指令]
})
导出类应用程序{
私人人员控制:FormGroup;
私人:个人[];
构造函数(私有_formBuilder:formBuilder){
这个人=人;
this.personControl=this.\u formBuilder.group({
personLabel:新表单控件(“”,
[
需要验证器
]),
personValue:new FormControl(“”,
[
需要验证器
])
});
}
}
出口类人员{
id:编号;
标签:字符串;
值:数字;
}
施工人员:人员[]=[
{id:1,标签:“个人1”,值:10},
{id:2,标签:“第二个人”,值:20},
{id:3,标签:“第三个人”,值:30}
];
我试图了解FormarAyname,但它似乎无法处理多个输入,并且您无法使用ngModel。
有人有主意吗
我使用angular 2.0.0-rc.4和forms 0.2.0formControlName=“personLabel”
和formControlName=“personValue”
必须是唯一的。他们使用最后一个标签和值,因为persons
中的最后一个对象覆盖了前面的对象
必须为以下各项定义唯一的FormControl
:
this.personControl = new FormGroup({
personLabel0 : new FormControl('',
[
Validators.required
]),
personValue0 : new FormControl('',
[
Validators.required
]),
personLabel1 : new FormControl('',
[
Validators.required
]),
personValue1 : new FormControl('',
[
Validators.required
]),
personLabel2 : new FormControl('',
[
Validators.required
]),
personValue2 : new FormControl('',
[
Validators.required
])
});
您可以使用以下功能动态调整formControlName
:
public getName(word, i) {
return "person" + word + i;
}
您可以从模板中调用该函数:
<div *ngFor="let p of persons; let i = index">
index : {{i}}<br/>
label : {{p.label}}<br/>
value : {{p.value}}<br/>
<input type="text"
maxlength="30"
[id]="'label-'+p.id"
[(ngModel)]="p.label"
formControlName="{{getName('Label', i)}}"
placeholder="{{p.id}}"/>
<input type="text"
maxlength="30"
[id]="'value-'+p.id"
[(ngModel)]="p.value"
formControlName="{{getName('Value', i)}}"/>
</div>
索引:{{i}}
标签:{p.label}}
值:{p.value}}
我还没有FormGroup
方面的经验,因此我不知道是否有办法动态地将新的FormControls
推送到FormGroup
(personControl
)对象上,不断调整名称。如果没有,则建议不要使用“模型驱动”形式
普朗克:好的,谢谢你的回复。我不明白formControlName必须是唯一的 我创建了另一个plunk,并对formControlName进行了更正: 代码如下:
@Component({
selector: "my-app",
providers: [],
template: "
<div>
<form [formGroup]="personControl">
<div *ngFor="let person of persons; let i = index">
index : {{i}}<br/>
label : {{person.label}}<br/>
value : {{person.value}}<br/>
<input type="text"
maxlength="30"
[id]="'label-'+person.id"
[(ngModel)]="person.label"
formControlName="personLabel"/>
<input type="text"
maxlength="30"
[id]="'value-'+person.id"
[(ngModel)]="person.value"
formControlName="personValue"/>
</div>
</form>
</div>
",
directives: [REACTIVE_FORM_DIRECTIVES]
})
export class App {
private personControl: FormGroup;
private persons : Person[];
constructor(private _formBuilder: FormBuilder) {
this.persons = PERSONS;
this.personControl = this._formBuilder.group({
personLabel : new FormControl("",
[
Validators.required
]),
personValue : new FormControl("",
[
Validators.required
])
});
}
}
export class Person {
id: number;
label: string;
value : number;
}
const PERSONS: Person[] = [
{ id: 1, label: "Person One", value : 10 },
{ id: 2, label: "Person Two", value : 20 },
{ id: 3, label: "Person Three", value : 30 }
];
@Component({
selector: 'my-app',
providers: [],
template: `
<div>
<form [formGroup]="personControl">
<div *ngFor="let person of persons; let i = index">
index : {{i}}<br/>
label : {{person.label}}<br/>
value : {{person.value}}<br/>
<input type="text"
maxlength="30"
[id]="'label-'+person.id"
[(ngModel)]="person.label"
[formControlName]="'personLabel'+person.id" />
<input type="text"
maxlength="30"
[id]="'value-'+person.id"
[(ngModel)]="person.value"
[formControlName]="'personValue'+person.id" />
</div>
</form>
</div>
`,
directives: [REACTIVE_FORM_DIRECTIVES]
})
export class App {
private personControl: FormGroup;
private persons : Person[];
constructor(private _formBuilder: FormBuilder) {
this.persons = PERSONS;
let ctrls = {};
this.persons.forEach(((person: Person) => {
ctrls[`personLabel${person.id}`] = new FormControl('',
[
Validators.required
]);
ctrls[`personValue${person.id}`] = new FormControl('',
[
Validators.required
]);
}).bind(this));
this.personControl = this._formBuilder.group(ctrls);
}
}
export class Person {
id: number;
label: string;
value : number;
}
const PERSONS: Person[] = [
{ id: 1, label: 'Person One', value : 10 },
{ id: 2, label: 'Person Two', value : 20 },
{ id: 3, label: 'Person Three', value : 30 }
];
@组件({
选择器:“我的应用程序”,
提供者:[],
模板:`
索引:{{i}}
标签:{{person.label}}
值:{{person.value}}
`,
指令:[反应形式指令]
})
导出类应用程序{
私人人员控制:FormGroup;
私人:个人[];
构造函数(私有_formBuilder:formBuilder){
这个人=人;
设ctrls={};
此.persons.forEach(((person:person)=>{
ctrls[`personLabel${person.id}`]=新表单控件(“”,
[
需要验证器
]);
ctrls[`personValue${person.id}`]=新表单控件(“”,
[
需要验证器
]);
}).约束(这个);
this.personControl=this.\u formBuilder.group(CTRL);
}
}
出口类人员{
id:编号;
标签:字符串;
值:数字;
}
施工人员:人员[]=[
{id:1,标签:'personone',值:10},
{id:2,标签:'Person Two',值:20},
{id:3,标签:'Person Three',值:30}
];