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绑定文件导入事件

您使用组件版设计器时可以在文件导入期间使用此功能。

绑定方法

在Designer类中提供了事件绑定方法bind、unbind和unbindAll。这些方法有助于在组件版设计器中添加或删除事件。

方法	描述
bind	将事件绑定到设计器。接受事件类型和事件发生时要运行的函数。
unbind	删除事件与设计器的绑定。接受要删除绑定的事件类型和函数
unbindAll	移除所有事件与设计器的绑定。

事件

在 Designer.Events类中提供了与文件导入相关的事件，即FileLoading和FileLoaded。

事件	描述
FileLoading	加载文件时发生
FileLoaded	加载文件后发生

这些事件在将 JSON、Excel 或 CSV 文件导入到 SpreadJS 时/后发生，但您也可以使用FileType枚举选项（例如 Json、Excel、Csv）指定特定格式的事件。

示例

使用FileLoading 事件，在导入的文件格式为 Excel 且工作表数大于或等于 3 时提示工作表数

var designer = new GC.Spread.Sheets.Designer.Designer(document.getElementById("designerHost"), '', spread);

// 在绑定方法中使用 FileLoading 事件
designer.bind(GC.Spread.Sheets.Designer.Events.FileLoading, function(type, message){
    if (message.fileType = GC.Spread.Sheets.Designer.FileType.Excel){
        let spreadJsonData = message.data;
        if(spreadJsonData.sheetCount >= 3) {
            window.alert("Number of worksheets: " + spreadJsonData.sheetCount);
        }
    };
});            

// 在绑定方法中使用 FileLoaded 事件
designer.bind(GC.Spread.Sheets.Designer.Events.FileLoaded, function(event,data){
    window.alert("File has loaded");
});

//使用unbind方法移除FileLoaded事件
designer.unbind(GC.Spread.Sheets.Designer.Events.FileLoaded);

// 使用unbindAll 方法移除所有事件
designer.unbindAll();