angular 2 中的 Ag-grid 外部过滤器，过滤器存在但网格未更新

Question

app.component.html

<div class="inlineBlock">
    <select [(ngModel)]="portId" id="portDropdownMenu" (change)="externalFilterChanged()">
        <option *ngFor="#portId of portIds">{{portId}}</option>
    </select>
</div>

<div class="container">
    <ag-grid-ng2 #agGrid
                 [gridOptions]="gridOptions"
                 [columnDefs]="myColumnDefs"
                 [rowData]="myRowData"
                 enableColResize
                 rowSelection="multiple"
                 enableSorting
                 enableFilter
                 [isExternalFilterPresent]="isExternalFilterPresent"
                 [doesExternalFilterPass]="doesExternalFilterPass"
                 rowHeight="30"
                 headerHeight="40"
                 enableRangeSelection
                 suppressContextMenu
                 suppressMenuColumnPanel
                 rowGroupPanelShow="always"
                 rememberGroupStateWhenNextData
                 groupDefaultExpanded="-1"
                 groupHideGroupColumns
                 groupUseEntireRow
                 (modelUpdated)="onModelUpdated()"
                 (filterChanged)="onFilterChanged()">
    </ag-grid-ng2>
</div>

app.component.ts

public isExternalFilterPresent() {
        return this.portType != "All Ports";
}

public doesExternalFilterPass(node) {
    switch (this.portType) {
        case "1": return node.data.Port === "1";
        case "2": return node.data.Port === "2";
        case "3": return node.data.Port === "3";
        default: return true;
    }

}

public externalFilterChanged() {
    var newValue = (<HTMLInputElement>document.getElementById("portDropdownMenu")).value
    this.portType = newValue;
    this.gridOptions.api.onFilterChanged();
}

public onFilterChanged() {
    if (this.gridOptions.api.isAnyFilterPresent()) {
        this.gridOptions.api.setRowData(this.gridOptions.rowData);
        this.gridOptions.api.refreshView();
    }
    console.log("filter changed ...");
}

通过 console.log(this.gridOption.isAnyFilterPresented())，我注意到更新下拉菜单时过滤器确实存在。但是，网格未根据外部过滤器进行更新。

我很确定 "isExternalFilterPresent()" 和 "doesExternalFilterPass(node)" 运行通过并提供了正确的 return 值。我的理解是 ag-grid 会处理剩下的事情，但它并没有这样做。有什么想法吗？

Answer 1

关于此问题的更新：

我的问题是 angular 2 个变量的范围。 this.portType 在 isExternalFilterPresent() 和 doesExternalFilterPass(node) 中未定义，即使我在构造函数中正确初始化。我的解决方法是每次调用这两个函数时从 HTML 检索 portType。

这不是一个很好的修复，希望有人能想出更好的办法。如果有人能解释为什么 portType 变量未定义？

Answer 2

这个问题有解决方案。

在类型脚本中声明两个函数：isExternalFilterPresent、doesExternalFilterPass，

获取 gridOptions 的一个实例，

  private gridOptions:GridOptions;

在构造函数中：

  this.gridOptions = <GridOptions>{};

然后

  this.gridOptions.isExternalFilterPresent  =  this.isExternalFilterPresent.bind(this);
  this.gridOptions.doesExternalFilterPass = this.doesExternalFilterPass.bind(this);

现在，您将能够在这些函数中访问组件的变量：

   this.myVariable

完整描述问题+解决方案： https://github.com/ceolter/ag-grid-ng2/issues/121

Answer 3

doesExternalFilterPass 和 isExternalFilterPresent 是箭头函数，因此 this 在这些函数中没有任何意义。下面是它们应该如何使用 -

/**
   * This property is an arrow function, which binds `this` to the Angular Component.
   * It's necessary otherwise `this` is undefined inside the function because
   * it's not called as a method of the class by the Datagrid.
   * It's called as `doesExternalFilterPass(node)` and not as `component.doesExternalFilterPass(node)`
   */
  doesExternalFilterPass = (node: RowNode): boolean => {
    return node.data.currency >= this.currencyFilter;
  }

来源 - https://github.com/ceolter/ag-grid-angular/issues/121

angular 2 中的 Ag-grid 外部过滤器，过滤器存在但网格未更新

Ag-grid external filter in angular 2, filter presents but grid not updating

ag-grid