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下面的部分描述了将Excel (.xlsx)和JSON文件(JSON或ssjson)导入SpreadJS的步骤。
除SpreadJS API外,还采用了以下方法:
//1: 创建 importJSON()
function importJSON(spreadJson) {
var ss = GC.Spread.Sheets.findControl(document.getElementById("ss"));
if (spreadJson.version && spreadJson.sheets) {
// 从JSON字符串spreadJSON加载对象
ss.fromJSON(spreadJson);
// 聚焦工作簿组件
ss.focus();
}
}
//2: 创建 importSpreadFromExcel()
function importSpreadFromExcel(file, options) {
// 加载一个Excel文件来绘制SpreadJS实例
excelIO.open(
file,
function (json) {
// 调用步骤1中创建的importJson()来导入Excel文件
importJSON(json);
},
function (e) {
console.log(e);
},
options
);
}
//3: 创建 importSpreadFromJSON()
function importSpreadFromJSON(file) {
function importSuccessCallback(responseText) {
// 解析JSON字符串
var spreadJson = JSON.parse(responseText);
// 执行importJSON方法从解析的JSON字符串加载SpreadJS实例
importJSON(spreadJson);
}
// 创建一个文件来读取JSON字符串
var reader = new FileReader();
// 当下面的readAsText()完成时,将触发此事件以成功返回回调
reader.onload = function () {
importSuccessCallback(this.result);
};
// 触发readAsText()方法
// 这将读取文件的内容,并在完成时触发加载事件
reader.readAsText(file);
return true;
}
//4: 创建importFile()函数来决定一个文件是.xlsx还是.JSON/.SSJSON
function importFile(file) {
// 获取所选文件的名称
var fileName = file.name;
// 获取文件名的最后一个“.”的索引位置
var index = fileName.lastIndexOf(".");
// 返回最后一个“.”索引位置的文件名的最后一部分。
var fileExt = fileName.substr(index + 1).toLowerCase();
// 根据文件扩展名确定要调用的导入扩展函数
if (fileExt === "json" || fileExt === "ssjson") {
importSpreadFromJSON(file);
} else if (fileExt === "xlsx") {
importSpreadFromExcel(file);
}
}
当使用id为 fileSelector 的HTML输入选择文件时,创建 processfilesselected 函数来执行 importFile 函数
//5: 创建 processFileSelected()
function processFileSelected() {
//使用id fileSelector从HTML输入中获取选中的文件
var fileSelector = document.getElementById("fileSelector");
var file = fileSelector.files[0];
if (!file) return false;
fileSelector.innerHTML = "";
// 在选择文件时执行importFile()
return importFile(file);
}
以上代码的输出如下所示:
Excel文件导入
JSON文件导入