extjs grid 复选框选择事件

开发中需求是统计选择的行数，所以要监控checkbox的选择事件包括表头的全选事件

遇到的问题就不赘述了

方案是监控grid的复选框和行加载时绑定事件

baseView: DBEN.controls.IGrid;

init() {
super.init();

let obj = this;
this.baseView.on("selectionchange",
    function (rowModel, record, rowIndex, eOpts) {
        var selections = obj.invoiceGrid.getSelectionModel().getSelection();
        var selectionLength = selections.length;
        obj.disSelectedIndex.setRawValue(selectionLength);
});

//行点击事件

this.control(this.view, {
      gridInvoiceDetail: { rowclick: this.egpUpGridRowClick }
})

}

egpUpGridRowClick(grid, row) {
    var selections = this.invoiceGrid.getSelectionModel().getSelection();
    var selectionLength = selections.length;
    this.disSelectedIndex.setRawValue(selectionLength);
}