ec3560192854ce05c59950ab4f7c5a123a84e6da
[Evergreen.git] / 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