angular基于ng-alain定義自己的select組件示例

更新時(shí)間：2018年02月23日 16:08:01 作者：阿踏

這篇文章主要介紹了angular基于ng-alain定義自己的select組件示例,小編覺得挺不錯(cuò)的，現(xiàn)在分享給大家，也給大家做個(gè)參考。一起跟隨小編過來看看吧

1、首先是my-select2.component.html頁面,這里是在ng-alain的select基礎(chǔ)上根據(jù)業(yè)務(wù)需求添加新的功能;代碼如下：

<nz-select #select style="width:100%;" [(ngModel)]="selectedOption" [nzPlaceHolder]="myPlaceHolder" nzAllowClear [nzShowSearch]="true" [nzNotFoundContent]="'無匹配'">
  <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頁面,代碼里面有注釋;代碼如下：

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 $: any;
@Component({
 selector: 'nz-select2',
 templateUrl: './my-select2.component.html',
 providers: [ 
     {
      provide: NG_VALUE_ACCESSOR,
      useExisting: forwardRef(() => NzSelect2Component),//注入表單控件
      multi: true
     }]
})
export class NzSelect2Component implements OnInit{
  constructor(private selectService:SelectService) { 
  }
 innerValue: any = ''; 
 //監(jiān)聽綁定的值，與外岑的ngModel相互綁定
 set selectedOption(val:any){
   if (val !== this.innerValue) {
      this.innerValue = val;
      this.onChangeCallback(val.value);
      this.dataBack.emit(val.value); // 事件
    }
 }
 get selectedOption():any{
    return this.innerValue;
 }
 options = [];//接收select的數(shù)組
  _dataSource:any;//接收本地的自定義數(shù)組或者請(qǐng)求返回的數(shù)組
 @Input()
 url:any;//請(qǐng)求的url
 @Input()
 myPlaceHolder:any;//自定義的PlaceHolder
 @Input()
 //下拉框的數(shù)據(jù)格式
  fieldKey:any = {
    text: 'text',
     value: 'value'
  };
 @Input()
  set dataSource(val: any) {
    this._dataSource = val;
    if ($.isArray(this._dataSource)) {   
    this.options=this._dataTransform(this._dataSource);//如果是本地?cái)?shù)組或直接請(qǐng)求的數(shù)組直接復(fù)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存在則直接請(qǐng)求
    if(this.url){
      this.selectService.getValue(this.url).subscribe(data => { 
        data = data.rows || data.data;    
        this.options=this._dataTransform(data);
      });
    }   
 }
 //轉(zhuǎn)換下拉框下的字段
  _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頁面,這里主要是請(qǐng)求后臺(tái)接口返回的下拉數(shù)組，url為父組件傳過來的鏈接,代碼如下：

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頁面,這里，使用該組件的前提是要引入 import { NzSelectModule } from 'ng-zorro-antd',代碼如下：

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,在你需要的模塊引入：MySelectModule

import { MySelectModule } from 'bizapp/base/components/myselect/myselect.module';

6、如何調(diào)用：url為請(qǐng)求后臺(tái)的接口，fieldKey為數(shù)組的格式，這里可以根據(jù)后臺(tái)返回來的格式定義這里的字段，如：后臺(tái)返回格式為[{dmsm1:5,dmz:5}]則fieldKey的定義如下，myPlaceHolder為初始化時(shí)顯示的內(nèi)容，如果是本地?cái)?shù)組，則只需要加上[dataSource]="peer"，這里的peer為本地?cái)?shù)組

復(fù)制代碼代碼如下:

<nz-select2  [url]="'analysis/api/data/code/list/030107'" [(ngModel)]="search2.hpzl" [fieldKey]="{text:'dmsm1',value:'dmz'}" [myPlaceHolder]="'號(hào)牌種類'"></nz-select2>

7、總結(jié)：通過這個(gè)組件，我們只需要修改url和fieldKey就可以在任意模塊引入然后使用，減少代碼的使用，方便維護(hù)

以上就是本文的全部?jī)?nèi)容，希望對(duì)大家的學(xué)習(xí)有所幫助，也希望大家多多支持腳本之家。

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