前言

这个组件实现并不是很复杂，我会尽量注释；
这货诞生的理由就是项目刚好有一个地方必须只能选择年月，而github上ng2+日期组件都涉及到年月日或时分秒；
效果用gifcam录制的，色彩有些失真，将就吧。。动手动手出真理

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效果图

实现代码

• html

<div class="only-year-month-select">
  <div class="select" (click)="isExpand = !isExpand">
    <input type="text" [placeholder]="placeholder" class="form-control" [(ngModel)]="selected" [disabled]="true">
  </div>
  <div class="list-menu" *ngIf="isExpand" [@fadeIn]="true">
    <div class="sub-list1">
      <p class="title">年份</p>
      <ul class="year-wrap">
        <li *ngFor="let i of selectYearRange;let index = index" [class.active]="i.active" (click)="actValue(selectYearRange,index)" (dblclick)="emitResult(i)">{{i.date}}</li>
      </ul>
    </div>
    <div class="sub-list2">
      <p class="title">月份</p>
      <ul class="month-wrap">
        <li *ngFor="let i of selectMonthRange;let index = index" [class.active]="i.active" (click)="actValue(selectMonthRange,index)" (dblclick)="emitResult(i)">{{i.date}}</li>
      </ul>
    </div>
  </div>
</div>

• components

import { Component,OnInit,Input,Output,EventEmitter,HostListener,ElementRef } from '@angular/core';

// 动画
import { fadeIn } from '../../animation/fadeIn';

@Component({
  selector: 'app-only-year-month-select',templateUrl: './only-year-month-select.component.html',styleUrls: ['./only-year-month-select.component.scss'],animations: [fadeIn]
})
export class OnlyYearMonthSelectComponent implements OnInit {
  @Input() public placeholder: string;
  @Input() public range: any;
  @Output() public result = new EventEmitter();
  public isExpand = false;
  public selectYear: any;
  public selectMonth: any;
  public selectYearRange: Array<any> = [];
  public selectMonthRange: Array<any> = [];
  public selected: any;
  constructor(
    private _el: ElementRef
  ) { }

  ngOnInit() {
    this.getCurrentDate();
  }

  // 获取当前的年月
  getCurrentDate(): void {
    const TODAY = new Date();
    this.selectYear = TODAY.getFullYear();
    this.selectMonth = TODAY.getMonth() < 9 ? '0' + (TODAY.getMonth() + 1) : String(TODAY.getMonth() + 1);
    this.selectYearRange.push(
      {
        date: this.selectYear,active: true,type: 'year'
      }
    );
    this.selectMonthRange.push(
      {
        date: this.selectMonth,type: 'month'
      }
    );
    this.selectYearRange = this.getRangeYear(this.selectYear,this.range.before,this.range.after);
    this.selectMonthRange = this.getRangeMonth(this.selectMonth);
    console.log(this.selectYearRange,this.selectMonthRange);
  }

  // 需要生成的日期范围
  getRangeYear(year: number,before: number = 5,after: number = 10): any {
    // console.log(year,before,after);

    let _beforeYear = year;
    let _afterYear = year;

    for (let i = 0; i < before; i++) {
      this.selectYearRange.unshift(
        {
          date: --_beforeYear,active: false,type: 'year'
        }
      );
    }
    for (let j = 0; j < after; j++) {
      this.selectYearRange.push(
        {
          date: ++_afterYear,type: 'year'
        }
      );
    }
    return this.selectYearRange;
  }

  // 月份范围
  getRangeMonth(month): any {
    for (let i = 0; i < 12; i++) {
      const temp = i < 9 ? '0' + (i + 1) : '' + (i + 1);
      if (month !== temp) {
        this.selectMonthRange.push(
          {
            date: temp,type: 'month'
          });
      }
    }
    this.selectMonthRange.sort(this.compare('date'));
    return this.selectMonthRange;
  }

  // 数组对象排序
  compare(property) {
    return function (a,b) {
      const value1 = a[property];
      const value2 = b[property];
      return value1 - value2;
    };
  }

  // 年份或者月份选择
  actValue(list: any,index: number) {

    list.forEach((v,i) => {
      if (i === index) {
        v.active = true;
        if (v.type === 'year') {
          console.log(v.date);
          this.selectYear = v.date;
        }
        if (v.type === 'month') {
          console.log(v.date);
          this.selectMonth = v.date;
        }

      } else {
        v.active = false;
      }
    });
    this.emitResult();
  }



  // 获取结果集
  emitResult(e?: any) {
    if (e) { // 双击则关闭弹出
      this.isExpand = false;
    }
    this.selected = this.selectYear + '-' + this.selectMonth;
    this.result.emit(this.selected);

  }


  // 监听全局点击事件
  @HostListener('document:click',['$event.target'])
  public onClick(targetElement) {
    const clickedInside = this._el.nativeElement.contains(targetElement);
    if (!clickedInside) {
      this.isExpand = false;
      this.emitResult();
    }

  }
}

• fadeIn.ts

// 动画的效果很简单，就是把css3的效果用js来实现，具体的效果就是渐现
// 放在突然出来一块区域的地方，触发看起来会比较顺眼，有个过渡

import { trigger,state,style,transition,animate,keyframes } from '@angular/animations';
//transition(':enter',[ ... ]); // void => *
//transition(':leave',[ ... ]); // * => void
export const fadeIn = trigger('fadeIn',[
  state('in',style({ display: 'none' })),transition('void => *',[
    animate(200,keyframes([
      style({ height: '0',opacity: 0,offset: 0 }),style({ height: '*',opacity: 1,offset: 1 })
    ]))
  ]),transition('* => void',keyframes([
      style({ height: '*',style({ height: '0',]);

// 200 是过渡时间，毫秒
// offset相当于 css3 中keyframes的百分比，，控制动画的进度的。。0 -> 1 就相当于 0% -> 100%

• 封装成一个模块给其他使用

import { NgModule } from '@angular/core';
import { CommonModule } from '@angular/common';
import { FormsModule } from '@angular/forms';

import { OnlyYearMonthSelectComponent } from './only-year-month-select.component';

@NgModule({
  imports: [
    CommonModule,// 用用到一些内置的指令必须依赖这个，比如*ngIF,*ngFor
    FormsModule // 有用到表单元素必须引入这货
  ],declarations: [OnlyYearMonthSelectComponent],// 声明年月组件
  exports: [OnlyYearMonthSelectComponent] // 导出年月组件
})
export class OnlyYearMonthSelectModule { }

---

组件使用

温馨提示：
- 若不是以模块的方式到处，只要在使用的模块引入组件声明下就能使用
- 反之则需要引入这个模块，方可使用

局部代码

• module

// 在要使用的模块中引入
// 公用组件
import { MitEhartsModule } from '../../../widgets/mit-echarts/mit-echarts.module';
import { MitDataTableModule } from '../../../widgets/mit-data-table/mit-data-table.module';
import { MitLoadingModule } from '../../../widgets/mit-loading/mit-loading.module';
import { OnlyYearMonthSelectModule } from '../../../share/only-year-month-select/only-year-month-select.module';
import { DepartmentSelectModule } from '../../../share/department-select/department-select.module';
const mitModule = [
  MitEhartsModule,MitDataTableModule,MitLoadingModule,DepartmentSelectModule,OnlyYearMonthSelectModule
]
@NgModule({
  imports: [
    CommonModule,FormsModule,NgbDatepickerModule,...mitModule,DailyCarRoutes
  ],providers: [DailyCarService],declarations: [...page]
}

• html

<div class="form-group condition-wrapper">
          <label class="form-control-label">月份</label>
          <app-only-year-month-select class="form-control" [placeholder]="'yyyy-mm'" (result)="Time = $event" [range]="{before:5,after:10}"></app-only-year-month-select>
        </div>

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总结

文章有错误之处亦或者有更好写法和建议的请留言指出，会及时改进和跟进…； 下一篇文章说下指令或者动画相关的。。。。整理下思路