这篇文章主要介绍了angular基于ng-alain定义自己的select组件示例,现在分享给大家,也给大家做个参考。
1、首先是my-select2.component.html页面,这里是在ng-alain的select基础上根据业务需求添加新的功能;代码如下:
<nz-select #select style="width:100%;" [(ngModel)]="selectedOption" [nzPlaceHolder]="myPlaceHolder" nzAllowClear [nzShowSearch]="true" [nzNotFoundContent]="'无匹配'"> <nz-option *ngFor="let option of options" [nzLabel]="option.label" [nzValue]="option" [nzDisabled]="option.disabled"> </nz-option> </nz-select>
2、再者是my-select2.component.ts页面,代码里面有注释;代码如下:
import { ControlValueAccessor } from '@angular/forms/src/directives'; import { Component, forwardRef, Input,OnInit,ElementRef,Output,EventEmitter} from '@angular/core'; import { NG_VALUE_ACCESSOR } from '@angular/forms'; import { Router, NavigationEnd } from '@angular/router'; import { FormGroup, FormBuilder, Validators } from '@angular/forms'; import { SelectService } from './my-select2.service'; declare var $: any; @Component({ selector: 'nz-select2', templateUrl: './my-select2.component.html', providers: [ { provide: NG_VALUE_ACCESSOR, useExisting: forwardRef(() => NzSelect2Component),//注入表单控件 multi: true }] }) export class NzSelect2Component implements OnInit{ constructor(private selectService:SelectService) { } innerValue: any = ''; //监听绑定的值,与外岑的ngModel相互绑定 set selectedOption(val:any){ if (val !== this.innerValue) { this.innerValue = val; this.onChangeCallback(val.value); this.dataBack.emit(val.value); // 事件 } } get selectedOption():any{ return this.innerValue; } options = [];//接收select的数组 _dataSource:any;//接收本地的自定义数组或者请求返回的数组 @Input() url:any;//请求的url @Input() myPlaceHolder:any;//自定义的PlaceHolder @Input() //下拉框的数据格式 fieldKey:any = { text: 'text', value: 'value' }; @Input() set dataSource(val: any) { this._dataSource = val; if ($.isArray(this._dataSource)) { this.options=this._dataTransform(this._dataSource);//如果是本地数组或直接请求的数组直接复制 } } get dataSource(): any { return this._dataSource; } @Output() dataBack = new EventEmitter<any>(); registerOnChange(fn: (value: any) => void) { this.onChangeCallback = fn; } registerOnTouched(fn: any) { this.onTouchedCallback = fn; } writeValue(value: string) { } onChangeCallback = (value: any) => {}; onTouchedCallback = (value: any) => {}; ngOnInit() { //如果url存在则直接请求 if(this.url){ this.selectService.getValue(this.url).subscribe(data => { data = data.rows || data.data; this.options=this._dataTransform(data); }); } } //转换下拉框下的字段 _dataTransform(data: Array<any>){ let _data = []; for (let i = 0; i < data.length; i++) { _data[i] = {}; _data[i].label = data[i][this.fieldKey.text]; _data[i].value = data[i][this.fieldKey.value]; } return _data; } }
3、然后是my-select2.service.ts页面,这里主要是请求后台接口返回的下拉数组,url为父组件传过来的链接,代码如下:
import { Injectable } from '@angular/core'; import { Headers, Http, URLSearchParams,RequestOptions } from '@angular/http'; import { HttpClient, HttpErrorResponse } from '@angular/common/http'; import 'rxjs/add/operator/toPromise'; // import { environment } from '../../environments/environment'; @Injectable() export class SelectService { constructor(private http: HttpClient) {} getValue(url: any):any{ return this.http .get(url); } }
4、然后是myselect.module.ts页面,这里,使用该组件的前提是要引入 import { NzSelectModule } from 'ng-zorro-antd',代码如下:
import { NgModule, ModuleWithProviders } from '@angular/core'; import { CommonModule } from '@angular/common'; import { FormsModule,ReactiveFormsModule } from '@angular/forms'; import { NzSelect2Component } from './my-select2.component'; import { SelectService } from './my-select2.service'; import { NzSelectModule } from 'ng-zorro-antd'; @NgModule({ imports: [ CommonModule, FormsModule, NzSelectModule, ReactiveFormsModule ], exports:[ NzSelect2Component ], declarations: [ NzSelect2Component ], providers: [ SelectService ] }) export class MySelectModule { constructor() { } }
5、使用方法,在你需要的模块引入:MySelectModule
import { MySelectModule } from 'bizapp/base/components/myselect/myselect.module';
6、如何调用:url为请求后台的接口,fieldKey为数组的格式,这里可以根据后台返回来的格式定义这里的字段,如:后台返回格式为[{dmsm1:5,dmz:5}]则fieldKey的定义如下,myPlaceHolder为初始化时显示的内容,如果是本地数组,则只需要加上[dataSource]="peer",这里的peer为本地数组
<nz-select2 [url]="'analysis/api/data/code/list/030107'" [(ngModel)]="search2.hpzl" [fieldKey]="{text:'dmsm1',value:'dmz'}" [myPlaceHolder]="'号牌种类'"></nz-select2>
7、总结:通过这个组件,我们只需要修改url和fieldKey就可以在任意模块引入然后使用,减少代码的使用,方便维护
上面是我整理给大家的,希望今后会对大家有帮助。
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