angular基于ng

网友投稿 370 2023-02-16


angular基于ng

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:

*ngFor="let option ohttp://f options"

[nzLabel]="option.label"

[nzValue]="option"

[nzDisabled]="option.disabled">

*ngFor="let option ohttp://f options"

[nzLabel]="option.label"

[nzValue]="option"

[nzDisabled]="option.disabled">

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, Valhttp://idators } 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();

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){

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

复制代码 代码如下:

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


版权声明:本文内容由网络用户投稿,版权归原作者所有,本站不拥有其著作权,亦不承担相应法律责任。如果您发现本站中有涉嫌抄袭或描述失实的内容,请联系我们jiasou666@gmail.com 处理,核实后本网站将在24小时内删除侵权内容。

上一篇:springboot使用校验框架validation校验的示例
下一篇:浅谈springfox
相关文章

 发表评论

暂时没有评论,来抢沙发吧~