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我使用组件的“名称”作为条件（如果，否则）。我试图通过 ElementRef 的 nativeElement 属性来获取它。它适用于（输入，文本区域）等元素，但我的自定义组件未定义。

import { BasicPermissionService } from './../components/basicpermission.service';
import { Directive, forwardRef, Input, ElementRef } from '@angular/core';
import { NG_VALIDATORS, AbstractControl, ValidatorFn, Validator, FormControl } from '@angular/forms';

@Directive({
   selector: '[ifRequired][ngModel]',
   providers: [
      { provide: NG_VALIDATORS, useExisting: ifRequiredValidator, multi: true }
   ]
})
export class ifRequiredValidator implements Validator {
validator: ValidatorFn;

constructor(private elem: ElementRef, private basicPermissionService: BasicPermissionService) {
    this.validator = this.ifRequiredValidateFactory(elem.nativeElement.name);
}

validate(c: FormControl) {
    return this.validator(c);
}

ifRequiredValidateFactory(control: string): ValidatorFn {
    return (c: AbstractControl) => {
        let isRequired = this.basicPermissionService.basicSectionIsRequired(control);
        let isValid = false;
        //if field is not required then do nothing
        if (!isRequired) {
            return null;
        }
        switch (true) {
            case typeof c.value == "number":
                isValid = c.value != null && c.value != 0;
                break;               
                ...
        }

        if (isValid) {
            return null;
        } else {
            let validatioMessage = (control: string) => {
                switch (control) {
                    case "name":
                        return "Mandatory field";
                    ...
                }
            }
            return {
                ifRequired: {
                    valid: false,
                    message: validatioMessage(control)
                }
            };
        }
    }
   }
 }

它正在为

 <input type="text" [(ngModel)]="basicInfo.Name" maxlength="200" placeholder="Name" name="name"
                     maxlength="2000" #name="ngModel"
                    ifRequired/>

但不是为了

<radio-select [IsMultiple]="true" [FieldType]="eventTypeField"
                            [SelectedIds]="basicInfo.EventTypeIds"
                            [(ngModel)]="basicInfo.EventTypeIds" [rname]="'EventType'" name="EventType"
                             #EventType="ngModel" ifRequired>
                        </radio-select>
4

2 回答 2

0

如果我理解正确的问题，您正在尝试使用选择器“radio-select”访问 HTML 中引用的组件。您可以使用以下代码：

HTML：

<radio-select [IsMultiple]="true" [FieldType]="eventTypeField"
                        [SelectedIds]="basicInfo.EventTypeIds"
                        [(ngModel)]="basicInfo.EventTypeIds" [rname]="'EventType'"name="EventType"
                         #EventType="ngModel" ifRequired
                          #radioSelectComponent>
                    </radio-select>

零件：

@ViewChild('radioSelectComponent') 无线电选择组件：

您现在可以使用变量“radioSelectComponent”引用该组件，从而访问其所有成员。

于 2019-11-14T11:25:13.043 回答
0

为in 指令类添加输入属性。name

@Input() name: string;

然后尝试访问名称属性而不是通过ElementRef对象访问属性。

希望能帮助到你！

于 2019-11-14T11:41:31.723 回答