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，网格没有根据外部过滤器进行更新。

我很确定＆＃34; isExternalFilterPresent（）＆＃34;和＆＃34; doExternalFilterPass（节点）＆＃34;贯穿并提供正确的返回值。我的理解是，ag-grid将负责其余部分，但它并没有这样做。有什么想法吗？

Answer 1

这个问题有一个解决方案。

声明两个函数：isExternalFilterPresent，doExternalFilterPass in type script，

获取gridOptions的实例，

  private gridOptions:GridOptions;

并在构造函数中：

  this.gridOptions = <GridOptions>{};

然后

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

现在，您将能够访问这些函数中的组件变量：

   this.myVariable

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

Answer 2

doesExternalFilterPass和isExternalFilterPresent是箭头函数，因此this在这些函数中没有意义。以下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

Answer 3

此问题的更新：

对我来说问题是角度2变量的范围。＆＃34; this.portType＆＃34;未定义在＆＃34; isExternalFilterPresent（）＆＃34;和＆＃34; doExternalFilterPass（节点）＆＃34;甚至我在构造函数中正确初始化。我的修复方法是每次调用这两个函数时从html中检索portType。

这不是一个好的解决方案，希望有人能想出更好的东西。如果有人能解释为什么portType变量未定义？

Ag-grid外部滤波器采用角度2，滤波器呈现但网格不更新

3 个答案: