我想创建一个自定义的 InputCustom 组件并用它来创建模型驱动的表单.
我的自定义组件只是包装了一个输入字段，并使用 Bootstrap material design 来实现外观.
@Component({选择器:'输入自定义'，模板:`<div class="form-group label-floating is-empty"><label class="control-label" for="input">在此处输入</label><input class="form-control" id="input" type="text"><p class="help-block">一些帮助文本</p><span class="material-input"></span>`})类 InputCustom{....}
在 Angular2 中，当您创建模型驱动的表单时
<输入类型=email"ngControl=email"></表单>所有出现在表单元素上的Controls 都注册到一个ControlGroup 中.通过使用 formRef，您可以跟踪控制器内的字段值.
@Component({...})类表单控制器{formRef:控制组；构造函数(...){this.form.valueChanges.subscribe(data => console.log('changes', data));}}现在，我希望人们像这样使用我的组件
<inputCustom type="email" ngControl="email"></表单>问题 1:我需要编写自己的自定义 ngControl 指令吗?
问题 2:如何将 ngControl 传播到由 包裹的内部 元素?
Q3: 我应该如何在周围的表单ControlGroup中注册我的Control?
我看到了两种实现方式:
提供您的控件作为自定义组件的参数:
@Component({选择器:'输入自定义'，模板:`<输入 [ngFormControl]="控制"/>`导出类 FormFieldComponent {(……)@输入()控制:控制；}这样您的输入将自动成为父组件中定义的表单的一部分.
实现符合 ngModel 的组件.实现时间有点长(你需要在自定义指令中实现和注册一个 ControlValueAccessor)但是这样你就可以直接使用 ngFormControl 和 ngModel 直接在您的自定义组件上.
有关更多详细信息，请参阅此问题:Angular 2 自定义表单输入
我认为这篇文章可能会让您感兴趣:
I want to create a custom InputCustom component and use it to create model-driven forms.
My custom component just wraps an input field and uses Bootstrap material design for look'n'feel.
@Component({
selector:'inputCustom',
template:`
<div class="form-group label-floating is-empty">
<label class="control-label" for="input">Type here</label>
<input class="form-control" id="input" type="text">
<p class="help-block">Some help text</p>
<span class="material-input"></span>
</div>
`})
class InputCustom{....}
In Angular2 when you create a model-driven form
<form [ngFormModel]="formRef">
<input type ="email" ngControl="email">
</form>
all Controls present on form elements are registered into a ControlGroup. By using the formRef you can track field values inside controllers.
@Component({...})
class FormController{
formRef: ControlGroup;
constructor(...){
this.form.valueChanges.subscribe(data => console.log('changes', data));
}
}
Now, I want people to use my component like this
<form [ngFormModel]="formRef">
<inputCustom type ="email" ngControl="email">
</form>
Q1: Do I need write my own custom ngControl directive?
Q2: How to propagate ngControl to the inner <input> element wrapped by <inputCustom>?
Q3: How should I register my Control inside the surrounding forms ControlGroup?
I see two ways to implement that:
Provide your control as parameter of your custom component:
@Component({
selector: 'inputCustom',
template: `
<input [ngFormControl]="control"/>
`
export class FormFieldComponent {
(...)
@Input()
control: Control;
}
This way your input will automatically takes part of the form defined in the parent component.
Implement an ngModel-compliant component. It's a bit longer to implement (you need to implement and register a ControlValueAccessor within a custom directive) but this way you will be able to use directly the ngFormControl and ngModel directly on your custom component.
<inputCustom type ="email" [ngFormControl]="email">
See this question for more details: Angular 2 custom form input
I think that this article could interest you:
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