代码之家 › 专栏 › 技术社区 › kal93

MatTable上的多个过滤器

angular-material typescript angular

kal93 · 技术社区 · 6 年前

我一直在尝试应用多列筛选,即列标题中的文本输入将仅对列的内容进行筛选 filterPredicate 属于 MatTableDataSource 但一旦我覆盖了跨列的默认筛选,它就不再工作了。

export class TableFilteringExample implements OnInit
{
  displayedColumns: string[] = ['position', 'name', 'weight', 'symbol'];
  dataSource = new MatTableDataSource(ELEMENT_DATA);

  positionFilter = new FormControl();
  nameFilter = new FormControl();

  filteredValues =
  {
    position: '',
    name: '',
    weight: '',
    symbol: ''
  };

  ngOnInit()
  {
    this.positionFilter.valueChanges.subscribe((positionFilterValue) =>
    {
      this.filteredValues['position'] = positionFilterValue;
      this.dataSource.filter = JSON.stringify(this.filteredValues);
    });

    this.nameFilter.valueChanges.subscribe((nameFilterValue) =>
    {
      this.filteredValues['name'] = nameFilterValue;
      this.dataSource.filter = JSON.stringify(this.filteredValues);
    });

    this.dataSource.filterPredicate = this.customFilterPredicate();
  }

  applyFilter(filterValue: string)
  {
    this.dataSource.filter = filterValue.trim().toLowerCase();
    this.dataSource.filter = filterValue;
  }

  customFilterPredicate()
  {
    const myFilterPredicate = function(data: PeriodicElement, filter: string): boolean
    {
      let searchString = JSON.parse(filter);

      return data.position.toString().trim().indexOf(searchString.position) !== -1 && data.name.toString().trim().toLowerCase().indexOf(searchString.name)!== -1;
    }

    return myFilterPredicate;
  }
}

StackBlitz

1 回复 | 直到 6 年前

Randal Cunanan 6 年前

我想你忘了打电话 toLowerCase() 对于 searchString.name

data.name.toString().trim().toLowerCase().indexOf(searchString.name.toLowerCase())!==-1;

一种方法是在组件类中创建全局筛选器字段。

globalFilter = '';

<mat-form-field>
  <input matInput [ngModel]="globalFilter" (ngModelChange)="applyFilter($event)" placeholder="Filter">
</mat-form-field>

applyFilter(filter) {
    this.globalFilter = filter;
    this.dataSource.filter = JSON.stringify(this.filteredValues);
}

然后尝试在其他字段之前使用全局筛选器进行筛选。

  customFilterPredicate() {
    const myFilterPredicate = (data: PeriodicElement, filter: string): boolean => {
      var globalMatch = !this.globalFilter;

      if (this.globalFilter) {
        // search all text fields
        globalMatch = data.name.toString().trim().toLowerCase().indexOf(this.globalFilter.toLowerCase()) !== -1;
      }

      if (!globalMatch) {
        return;
      }

      let searchString = JSON.parse(filter);
      return data.position.toString().trim().indexOf(searchString.position) !== -1 &&
        data.name.toString().trim().toLowerCase().indexOf(searchString.name.toLowerCase()) !== -1;
    }
    return myFilterPredicate;
  }

https://stackblitz.com/edit/angular-hbakxo-5jeaic

Code Spy 5 年前

在角度材质表中,可以使用 过滤器预测 属性,并为其提供 自定义筛选器 方法如下

来源 Link

演示 Link

        ngOnInit() {

        // Overrride default filter behaviour of Material Datatable
        this.dataSource.filterPredicate = this.createFilter();
        }

        ...
        ...

        // Custom filter method fot Angular Material Datatable
        createFilter() {
        let filterFunction = function (data: any, filter: string): boolean {
          let searchTerms = JSON.parse(filter);
          let isFilterSet = false;
          for (const col in searchTerms) {
            if (searchTerms[col].toString() !== '') {
              isFilterSet = true;
            } else {
              delete searchTerms[col];
            }
          }

          let nameSearch = () => {
            let found = false;
            if (isFilterSet) {
              for (const col in searchTerms) {
                searchTerms[col].trim().toLowerCase().split(' ').forEach(word => {
                  if (data[col].toString().toLowerCase().indexOf(word) != -1 && isFilterSet) {
                    found = true
                  }
                });
              }
              return found
            } else {
              return true;
            }
          }
          return nameSearch()
        }
        return filterFunction
        }