How to do filter in angular material data table for specific column

问题

i am trying angular material data table.

As we know filtering happened for each row by default.

If i want to filter column specific, then what should i do?

Should i have to write method for getting all records, then iterate over it and compare specific column?

component.ts

---

ngOnInit() {
    this.service.getUser().subscribe( results => {
        if(!results){

          return;
        }
        console.log(results);
        this.dataSource = new MatTableDataSource(results);
        this.dataSource.sort = this.sort;
    })


onSearchClear(){
    this.searchKey="";
    this.applyFilter();
  }

  applyFilter(){
    this.dataSource.filter = this.searchKey.trim().toLowerCase();
  }

component.html

---

<mat-form-field class="search-form-field">
      <input matInput [(ngModel)]="searchKey" placeholder="search by userName" (keyup)="applyFilter()">
    </mat-form-field>

回答1:

you should use filterPredicate property of MatTableDataSource

after you initialize this.dataSource, define a custom filterPredicate function as follows;

this.dataSource = new MatTableDataSource(results);
this.dataSource.sort = this.sort;
this.dataSource.filterPredicate = function(data: any, filterValue: string) {
  return data.specificColumn /** replace this with the column name you want to filter */
    .trim()
    .toLocaleLowerCase().indexOf(filterValue.trim().toLocaleLowerCase()) >= 0;
};

回答2:

Check this tutorial and working demo

来源：https://stackoverflow.com/questions/56620674/how-to-do-filter-in-angular-material-data-table-for-specific-column