问题描述
我正在尝试为 Jquery UI Datepicker 创建我自己的 Angular 2 指令.我在互联网和 SO 中也看到了一些不同的方法,但没有人达到我想要的目标.所以这是我到目前为止的代码:
I'm trying to create my own Angular 2 Directive for Jquery UI Datepicker. I've seen some different approaches on the internet and in SO as well, but no one achieves the goal that I want to. So this is the code that I have so far:
import {Directive, ElementRef, Input, forwardRef} from '@angular/core';
import {ControlValueAccessor, NG_VALUE_ACCESSOR} from "@angular/forms";
declare var $:any;
@Directive({
selector: '[date-picker]',
providers: [{
provide: NG_VALUE_ACCESSOR,useExisting:
forwardRef(() => DatePickerDirective),
multi: true
}]
})
export class DatePickerDirective implements ControlValueAccessor {
private value: string;
@Input('changeMonth') changeMonth:boolean = true;
@Input('changeYear') changeYear:boolean = true;
constructor(private el: ElementRef) {
}
ngAfterViewInit(){
$(this.el.nativeElement).datepicker({
changeMonth: this.changeMonth,
yearRange: "1:100",
changeYear: this.changeYear
}).on('change', e => this.onChange(e.target.value));
}
onChange: Function = () => {};
onTouched: Function = () => {};
writeValue(val: string) : void {
this.value = val;
}
registerOnChange(fn: Function): void {
this.onChange = fn;
}
registerOnTouched(fn: Function): void {
this.onTouched = fn;
}
}
发生的情况是,即使我选择一个日期(选择器)或直接在输入字段中输入它,它也不会更新touched"属性.
What is happening is that even when I select a date (picker) or type it directly on input field, it isn't updating "touched" property.
你有什么修复它的想法吗?
Do you have any ideas for fixing it?
推荐答案
对于那些最终遇到同样问题的人,我想出了一种方法来管理它,如下所示:
For those who eventually have the same problem, I figured out a way to manage it, as you can below:
import {Directive, ElementRef, Input, forwardRef} from '@angular/core';
import {ControlValueAccessor, NG_VALUE_ACCESSOR} from "@angular/forms";
declare var $:any;
export const CUSTOM_INPUT_DATE_PICKER_CONTROL_VALUE_ACCESSOR: any = {
provide: NG_VALUE_ACCESSOR,
useExisting: forwardRef(() => DatePickerDirective),
multi: true
};
@Directive({
selector: '[date-picker]',
host: {'(blur)': 'onTouched($event)'},
providers: [CUSTOM_INPUT_DATE_PICKER_CONTROL_VALUE_ACCESSOR]
})
export class DatePickerDirective implements ControlValueAccessor {
private innerValue: string;
@Input('changeMonth') changeMonth:boolean = true;
@Input('changeYear') changeYear:boolean = true;
constructor(private el: ElementRef) {
$(this.el.nativeElement).datepicker({
changeMonth: true,
changeYear: true,
dateFormat: 'dd/mm/yy'
}).on('change', e => this.onChange(e.target.value));
}
public onChange: any = (_) => { /*Empty*/ }
public onTouched: any = () => { /*Empty*/ }
get value(): any {
return this.innerValue;
};
//set accessor including call the onchange callback
set value(v: any) {
if (v !== this.innerValue) {
this.innerValue = v;
this.onChange(v);
}
}
writeValue(val: string) : void {
this.innerValue = val;
}
registerOnChange(fn: any): void {
this.onChange = fn;
}
registerOnTouched(fn: any): void {
this.onTouched = fn;
}
}
这篇关于实现 ControlValueAccessor 的 Angular 2 指令不会在更改时更新“触摸"属性的文章就介绍到这了,希望我们推荐的答案对大家有所帮助,也希望大家多多支持!