angular - 在所有列上实现 NGX 数据表过滤

Question

我一直在努力使它正常工作，但运气不佳。我一直在引用这些资源以寻求帮助: 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，而不用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，我显然只是处理对项目数组的“名称”属性的过滤。这很好用，但就像我提到的那样，如果网格包含许多列，我想要一种方法来处理所有列。感谢您提供任何帮助或提示。

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，我能够成功地使其动态过滤所有列(它将过滤所有列而无需指定它们)。我已经包括了我认为是它工作所需的所有必要部分，但也尽可能地精简了代码以使其更易于理解。

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)'>

typescript

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;
}