在所有列上实施NGX Datatable过滤

Question

我一直试图让这个工作没有运气.我一直在引用这些资源寻求帮助:http: //swimlane.github.io/ngx-datatable/#filter
https://github.com/swimlane/ngx-datatable/blob/master/demo/basic/filter. component.ts

基本上我只是想让我的过滤器应用于多个列,而不需要实现代码来处理每一列.(有些数据表有​​20多列!)

示例代码:

//HTML
  <input type='text' placeholder='Filter' (keyup)='updateFilter($event.target.value)' />

  <ngx-datatable
    class="material"
    columnMode="force"
    [columns]="gridProperties.FilteredColumns"
    [footerHeight]="50"
    [loadingIndicator]="gridLoadingIndicator"
    [rows]="filteredList"
    [scrollbarH]="false"
    [scrollbarV]="true"
    [selected]="selectedItem"
    [selectionType]="'single'"
    style="min-height:400px;">
  </ngx-datatable>

//TYPESCRIPT
  public items: Item[];

  updateFilter(filterValue) {
    const lowerValue = filterValue.toLowerCase();

    this.filteredList = this.items.filter(item => item.name.toLowerCase().indexOf(lowerValue) !== -1 || !lowerValue);
  }

在这里,我显然只是处理我的items数组的'name'属性的过滤.这很好用,但就像我提到的那样,如果网格包含很多列,我想要一种方法来处理所有这些.任何帮助或提示表示赞赏.

Answer 1

使用示例TS文件进行过滤(https://github.com/swimlane/ngx-datatable/blob/master/demo/basic/filter.component.ts)作为基础,我能够成功地使其过滤所有列动态(它将过滤所有列而无需指定它们).我已经包含了我认为是工作所需的所有必要部分,但也尽可能地减少了代码,使其更容易理解.

HTML

<ngx-datatable
 #table
 class="material striped scroll-vertical"
 [rows]="data"
 [columns]="cols"
 [columnMode]="'force'"
 [headerHeight]="35"
 [footerHeight]="35"
 [rowHeight]="'auto'"
 [limit]="pageSize"
 [selectionType]="'single'">

<input type="text" (keyup)='filterDatatable($event)'>

打字稿

cols = [{name:'First Name'},{name:'Last Name'},{name:'Address'}];
data = [];
filteredData = [];

// dummy data for datatable rows
dummyData = [
  {firstName:'Daenarys',lastName:'Targaryen',address:'Dragonstone'},
  {firstName:'Sansa',lastName:'Stark',address:'Winterfell'},
  {firstName:'Cersei',lastName:'Lannister',address:'Kings Landing'},
  {firstName:'Brienne',lastName:'Tarth',address:'Sapphire Island'},
  {firstName:'Lyanna',lastName:'Mormont',address:'Bear Island'},
  {firstName:'Margaery',lastName:'Tyrell',address:'Highgarden'}
]

ngOnInit(){
  // populate datatable rows
  this.data = this.dummyData;
  // copy over dataset to empty object
  this.filteredData = this.dummyData;
}

// filters results
filterDatatable(event){
  // get the value of the key pressed and make it lowercase
  let val = event.target.value.toLowerCase();
  // get the amount of columns in the table
  let colsAmt = this.cols.length;
  // get the key names of each column in the dataset
  let keys = Object.keys(this.dummyData[0]);
  // assign filtered matches to the active datatable
  this.data = this.filteredData.filter(function(item){
    // iterate through each row's column data
    for (let i=0; i<colsAmt; i++){
      // check for a match
      if (item[keys[i]].toString().toLowerCase().indexOf(val) !== -1 || !val){
        // found match, return true to add to result set
        return true;
      }
    }
  });
  // whenever the filter changes, always go back to the first page
  this.table.offset = 0;
}

Answer 2

这是具有多列过滤的代码示例：

updateFilter(filter: string): void {

  const val = filter.trim().toLowerCase();

  this.filteredList = this.items.slice().filter((item: any) => {
    let searchStr = '';
    for (let i = 0; i < this.gridProperties.FilteredColumns.length; i++) {
      searchStr += (item[this.gridProperties.FilteredColumns[i]]).toString().toLowerCase();
    }
    return searchStr.indexOf(val) !== -1 || !val;
  });
}

如果我没有犯任何错误，它应该可以正常工作。