[英]How can i write a custom filterfunction for Date
I have a DataTable with a column Timestamp: 我有一个带有时间戳列的DataTable:
<p-dataTable sortMode="multiple" scrollable="scrollable" scrollHeight="150" [value]="currentChartData" #dt>
<p-column field="timestamp" header="Timestamp" [sortable]="true" [filter]="true">
<ng-template pTemplate="filter" let-col>
<div class="d-flex flex-row flex-wrap justify-content-center align-content-center">
<div style="padding-right: 29px">
<p-calendar [(ngModel)]="from" [showTime]="true"
(onSelect)="filter(dt, 'from')"
(onClearClick)="filter(dt, 'from')"
showButtonBar="true" readonlyInput="true"
[inputStyle]="{'width': '8em'}" styleClass="ui-column-filter" appendTo="body"
dateFormat="dd.mm.yy">
</p-calendar>
</div>
<div style="padding-right: 29px">
<p-calendar [(ngModel)]="to" [showTime]="true"
(onSelect)="filter(dt, 'to')"
(onClearClick)="filter(dt, 'to')"
showButtonBar="true" readonlyInput="true"
[inputStyle]="{'width': '8em'}" styleClass="ui-column-filter" appendTo="body"
dateFormat="dd.mm.yy">
</p-calendar>
</div>
</div>
</ng-template>
<ng-template let-row="rowData" pTemplate="body">
{{row.timestamp.toLocaleString()}}
</ng-template>
</p-column></p-dataTable>
I want to use two calendars for filterfields "from" and "to" in order to filter for row between two dates. 我想使用两个日历作为“从”和“到”的过滤字段,以便过滤两个日期之间的行。
My filter function looks like this: 我的过滤器功能如下所示:
between(value: any, from: any, to: any): boolean {
if (from === undefined || from === null) {
return true;
}
if (to === undefined || to === null) {
return false;
}
if ((from === undefined || from === null ||
(typeof from === 'string' && from.trim() === '') || from <= value) &&
(to === undefined || to === null ||
(typeof to === 'string' && to.trim() === '') || to >= value)) {
return true;
}
return false;
};
Normally you execute a filter on the datatable with dt.filter()
. 通常,您可以使用
dt.filter()
在数据表上执行过滤器。 How am i able to overwrite this to filter with my between function. 我如何覆盖此函数以使用我的函数间进行过滤。 What is the return value of
dt.filter()
? dt.filter()
的返回值是dt.filter()
?
I injected the new filterConstraint into the Datatable with 我将新的filterConstraint注入到Datatable中,
@ViewChild('dt') dataTable: DataTable;
ngAfterViewChecked() {
if (this.dataTable !== undefined) {
const customFilterConstraints = this.dataTable.filterConstraints;
customFilterConstraints[ 'between' ] = this.between;
this.dataTable.filterConstraints = customFilterConstraints;
}
}
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