角度材料日期选择器限制范围选择 [英] Angular material datepicker limit the range selection
问题描述
我有一个角度范围的材料日期选择器(开始日期和结束日期).
I have an angular material date picker of ranges (start date and end date).
目前,它是自由选择的.意思是,我可以选择任何开始日期和任何结束日期.我想稍微改变一下.我希望它限制最多 7 天的差异.我不想让用户选择天数相差超过 7 的 2 个日期.
Currently, it is free-selection. Meaning, I can choose any start date and any end date. I'd like to change it a bit. I want it to limit up to 7 days difference. I do not want to allow the user to choose 2 dates with the difference in days is more than 7.
所以在日历内部:看起来像这样
如您所见,10 月 5 日是开始日期,它允许我们选择 10 月 17 日作为结束日期.但我希望用户只能在 10 月 5 日至 10 月 12 日的范围内选择结束日期(最大相差 7 天).
As you can see, 5th October is the start date, and it allows us to choose 17th October as the end date. But I want the user to be limited to choose the end date only in the range of 5th October to 12th October (7 days difference maximum).
有办法吗?
这是我的 HTML:
<mat-form-field class="datepicker" appearance="fill">
<mat-label>Enter a date range</mat-label>
<mat-date-range-input [formGroup]="rangeForm" [rangePicker]="picker" [max]="maxDate">
<input matStartDate formControlName="start" placeholder="Start date" readonly>
<input matEndDate formControlName="end" placeholder="End date" readonly>
</mat-date-range-input>
打字稿:
import { Component, OnInit } from '@angular/core';
import { FormControl, FormGroup } from '@angular/forms';
import * as moment from 'moment';
@Component({
selector: 'app-chart',
templateUrl: './chart.component.html',
styleUrls: ['./chart.component.scss']
})
export class ChartComponent implements OnInit {
private _startDate: moment.Moment = moment().subtract(6, 'days');
private _endData: moment.Moment = moment();
public maxDate: Date = this._endData.toDate();
public rangeForm: FormGroup = new FormGroup({
start: new FormControl(this._startDate.toDate()),
end: new FormControl(this._endData.toDate()),
});
constructor() { }
ngOnInit(): void {
}
/**
* Getter for start date
* @returns string
*/
public getStartDate(): string {
return this._startDate.format('DD/MM/YYYY');
}
/**
* Getter for end date
* @returns string
*/
public getEndDate(): string {
return this._endData.format('DD/MM/YYYY');
}
}
推荐答案
实施 MatDateRangeSelectionStrategy,
Implementing a MatDateRangeSelectionStrategy,
我们创建了一个像这样的提供者
We create a provider like
@Injectable()
export class MaxRangeSelectionStrategy<D> implements MatDateRangeSelectionStrategy<D> {
start: any;
constructor(
@Inject('rangeMax') private delta: number,
private _dateAdapter: DateAdapter<D>
) {}
selectionFinished(date: D, currentRange: DateRange<D>) {
let { start, end } = currentRange;
if (start == null || (start && end)) {
start = date;
end = null;
} else if (end == null) {
const maxDate = this._dateAdapter.addCalendarDays(start, this.delta);
end = date ? date > maxDate ? maxDate : date : null;
}
return new DateRange<D>(start, end);
}
createPreview(activeDate: D | null, currentRange: DateRange<D>): DateRange<D> {
if (currentRange.start && !currentRange.end) {
const maxDate = this._dateAdapter.addCalendarDays(currentRange.start, this.delta);
const rangeEnd = activeDate ? activeDate > maxDate ? maxDate : activeDate : null;
return new DateRange(currentRange.start, rangeEnd);
}
return new DateRange<D>(null, null);
}
}
你可以直接在你的组件中使用
You can use in directily in your component like
@Component({
selector: "date-range-picker-selection-strategy-example",
templateUrl: "date-range-picker-selection-strategy-example.html",
providers: [
{provide: 'rangeMax', useValue: 5},
{
provide: MAT_DATE_RANGE_SELECTION_STRATEGY,
useClass: MaxRangeSelectionStrategy
}
]
})
export class DateRangePickerSelectionStrategyExample {}
但最好创建一个指令(不要忘记在你的模块中声明)
But it's better create a Directive (don't forget declare in your module)
为此,首先替换 MaxRangeSelectionStrategy 的构造函数以移除 @Inject('rangeMax')
并声明变量 delta:
For this, first replace the constructor of the MaxRangeSelectionStrategy to remove the @Inject('rangeMax')
and declare the variable delta:
public delta: number; //<--get out of constructor and make public
constructor(private _dateAdapter: DateAdapter<D>) {}
现在创建指令:
@Directive({
selector: "[maxRange]",
providers: [
{
provide: MAT_DATE_RANGE_SELECTION_STRATEGY,
useClass: MaxRangeSelectionStrategy
}
]
})
export class MaxRangeDirective {
constructor(
@Inject(MAT_DATE_RANGE_SELECTION_STRATEGY)
private maxRangeStrategy: MaxRangeSelectionStrategy<any>
) {}
@Input() set maxRange(value: number) {
this.maxRangeStrategy.delta = +value || 7;
}
}
并在 .html 中使用
And use in the .html
<mat-date-range-picker maxRange=5 #picker></mat-date-range-picker>
最后,我们可以在styles.scss中加入一个.css之类的
At last, We can add in styles.scss a .css like
.mat-calendar-body-preview-end> .mat-calendar-body-cell-content {
background-color: rgba(0, 0, 0, 0.04)!important;
}
将最后一个元素标记为选中
To mark as selected the last element
参见 stackbliz
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