Open-ILS/src/eg2/src/app/share/date-select/date-select.component.ts

   1 import {Component, OnInit, Input, Output, ViewChild, EventEmitter, forwardRef} from '@angular/core';
   2 import {NgbDateStruct} from '@ng-bootstrap/ng-bootstrap';
   3 import {ControlValueAccessor, NG_VALUE_ACCESSOR} from '@angular/forms';
   4
   5 /**
   6  * RE: displaying locale dates in the input field:
   7  * https://github.com/ng-bootstrap/ng-bootstrap/issues/754
   8  * https://stackoverflow.com/questions/40664523/angular2-ngbdatepicker-how-to-format-date-in-inputfield
   9  */
  10
  11 @Component({
  12   selector: 'eg-date-select',
  13   templateUrl: './date-select.component.html',
  14   styleUrls: ['date-select.component.css'],
  15   providers: [ {
  16       provide: NG_VALUE_ACCESSOR,
  17       useExisting: forwardRef(() => DateSelectComponent),
  18       multi: true
  19   } ]
  20 })
  21 export class DateSelectComponent implements OnInit, ControlValueAccessor {
  22
  23     @Input() initialIso: string; // ISO string
  24     @Input() initialYmd: string; // YYYY-MM-DD (uses local time zone)
  25     @Input() initialDate: Date;  // Date object
  26     @Input() required: boolean;
  27     @Input() fieldName: string;
  28     @Input() domId = '';
  29     @Input() disabled: boolean;
  30     @Input() readOnly: boolean;
  31
  32     current: NgbDateStruct;
  33
  34     @Output() onChangeAsDate: EventEmitter<Date>;
  35     @Output() onChangeAsIso: EventEmitter<string>;
  36     @Output() onChangeAsYmd: EventEmitter<string>;
  37     @Output() onCleared: EventEmitter<string>;
  38
  39     // convenience methods to access current selected date
  40     currentAsYmd(): string {
  41         if (this.current == null) { return null; }
  42         if (!this.isValidDate(this.current)) { return null; }
  43         return `${this.current.year}-${String(this.current.month).padStart(2, '0')}-${String(this.current.day).padStart(2, '0')}`;
  44     }
  45     currentAsIso(): string {
  46         if (this.current == null) { return null; }
  47         if (!this.isValidDate(this.current)) { return null; }
  48         const ymd = `${this.current.year}-${String(this.current.month).padStart(2, '0')}-${String(this.current.day).padStart(2, '0')}`;
  49         const date = this.localDateFromYmd(ymd);
  50         const iso = date.toISOString();
  51         return iso;
  52     }
  53     currentAsDate(): Date {
  54         if (this.current == null) { return null; }
  55         if (!this.isValidDate(this.current)) { return null; }
  56         const ymd = `${this.current.year}-${String(this.current.month).padStart(2, '0')}-${String(this.current.day).padStart(2, '0')}`;
  57         const date = this.localDateFromYmd(ymd);
  58         return date;
  59     }
  60
  61     // Stub function required by ControlValueAccessor
  62     propagateChange = (_: any) => {};
  63
  64     constructor() {
  65         this.onChangeAsDate = new EventEmitter<Date>();
  66         this.onChangeAsIso = new EventEmitter<string>();
  67         this.onChangeAsYmd = new EventEmitter<string>();
  68         this.onCleared = new EventEmitter<string>();
  69     }
  70
  71     ngOnInit() {
  72
  73         if (this.initialYmd) {
  74             this.initialDate = this.localDateFromYmd(this.initialYmd);
  75
  76         } else if (this.initialIso) {
  77             this.initialDate = new Date(this.initialIso);
  78         }
  79
  80         if (this.initialDate) {
  81             this.current = {
  82                 year: this.initialDate.getFullYear(),
  83                 month: this.initialDate.getMonth() + 1,
  84                 day: this.initialDate.getDate()
  85             };
  86         }
  87     }
  88
  89     isValidDate(dt: NgbDateStruct): dt is NgbDateStruct {
  90         return (<NgbDateStruct>dt).year !== undefined;
  91     }
  92
  93     onDateEnter() {
  94         if (this.current === null) {
  95             this.onCleared.emit('cleared');
  96         } else if (this.isValidDate(this.current)) {
  97             this.onDateSelect(this.current);
  98         }
  99         // ignoring invalid input for now
 100     }
 101
 102     onDateSelect(evt) {
 103         const ymd = `${evt.year}-${String(evt.month).padStart(2, '0')}-${String(evt.day).padStart(2, '0')}`;
 104         const date = this.localDateFromYmd(ymd);
 105         const iso = date.toISOString();
 106         this.onChangeAsDate.emit(date);
 107         this.onChangeAsYmd.emit(ymd);
 108         this.onChangeAsIso.emit(iso);
 109         this.propagateChange(date);
 110     }
 111
 112     // Create a date in the local time zone with selected YMD values.
 113     // TODO: Consider moving this to a date service...
 114     localDateFromYmd(ymd: string): Date {
 115         const parts = ymd.split('-');
 116         return new Date(
 117             Number(parts[0]), Number(parts[1]) - 1, Number(parts[2]));
 118     }
 119
 120     reset() {
 121         this.current = {
 122             year: null,
 123             month: null,
 124             day: null
 125         };
 126     }
 127
 128     writeValue(value: Date) {
 129         if (value !== undefined) {
 130             this.initialDate = value;
 131         }
 132     }
 133
 134     registerOnChange(fn) {
 135         this.propagateChange = fn;
 136     }
 137
 138     registerOnTouched() { }
 139 }
 140
 141