angular基于ng-alain定义自己的select组件示例

<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>

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;
 }
}

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);
   
  }
}

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() {

  }
}

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