如何导出大量的json数据到CSV而没有浏览器崩溃？ [英] how to export large amount of json data to CSV without browser crash?
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问题描述
我有大量的表数据（说22k行）。这些22k行从json文件填充。我现在想做的是将这些数据导出为CSV。
I have large amount of table data (say 22k rows). These 22k rows are populated from a json file. What i want to do now is to export these data to CSV.
<html>
<head>
<link rel="stylesheet" type="text/css" href="a.css">
</head>
<body>
<div class='mydiv'>
<textarea id="txt" class='txtarea'>
// json datas here.. ( say , 22k rows
</textarea>
<button class='gen_btn'>Generate File</button>
</div>
</body>
</html>
js file :
$(document).ready(function() {
$('button').click(function() {
var data = $('#txt').val();
if (data == '')
return;
JSONToCSVConvertor(data, "Data Excel", true);
});
});
function JSONToCSVConvertor(JSONData, ReportTitle, ShowLabel) {
var arrData = typeof JSONData != 'object' ? JSON.parse(JSONData) : JSONData;
var CSV = '';
CSV += ReportTitle + '\r\n\n';
if (ShowLabel) {
var row = "";
for (var index in arrData[0]) {
row += index + ',';
}
row = row.slice(0, -1);
CSV += row + '\r\n';
}
for (var i = 0; i < arrData.length; i++) {
var row = "";
for (var index in arrData[i]) {
row += '"' + arrData[i][index] + '",';
}
row.slice(0, row.length - 1);
CSV += row + '\r\n';
}
if (CSV == '') {
alert("Invalid data");
return;
}
var fileName = "MyReport_";
fileName += ReportTitle.replace(/ /g, "_");
var uri = 'data:text/csv;charset=utf-8,' + escape(CSV);
var link = document.createElement("a");
link.href = uri;
link.style = "visibility:hidden";
link.download = fileName + ".csv";
document.body.appendChild(link);
link.click();
document.body.removeChild(link);
}
如何编写js文件以将所有这22k行导出到excel崩溃？ （它不应该显示kill页面）。
how to write a js file to export all these 22k rows to excel without browser crash ? (it shouldn't show kill pages ).
推荐答案
看起来这个问题很老了，然后
Looks like this question is very old.. but if someone is still looking for solution then
这可能会有帮助。
在这段代码中，我使用blob来创建csv文件。
in this code i am using blob to create the csv file.
function JSONToCSVConvertor(JSONData, ReportTitle, ShowLabel) {
//If JSONData is not an object then JSON.parse will parse the JSON string in an Object
var arrData = typeof JSONData != 'object' ? JSON.parse(JSONData) : JSONData;
var CSV = '';
//This condition will generate the Label/Header
if (ShowLabel) {
var row = "";
//This loop will extract the label from 1st index of on array
for (var index in arrData[0]) {
//Now convert each value to string and comma-seprated
row += index + ',';
}
row = row.slice(0, -1);
//append Label row with line break
CSV += row + '\r\n';
}
//1st loop is to extract each row
for (var i = 0; i < arrData.length; i++) {
var row = "";
//2nd loop will extract each column and convert it in string comma-seprated
for (var index in arrData[i]) {
row += '"' + arrData[i][index] + '",';
}
row.slice(0, row.length - 1);
//add a line break after each row
CSV += row + '\r\n';
}
if (CSV == '') {
alert("Invalid data");
return;
}
//this trick will generate a temp "a" tag
var link = document.createElement("a");
link.id="lnkDwnldLnk";
//this part will append the anchor tag and remove it after automatic click
document.body.appendChild(link);
var csv = CSV;
blob = new Blob([csv], { type: 'text/csv' });
var csvUrl = window.webkitURL.createObjectURL(blob);
var filename = 'UserExport.csv';
$("#lnkDwnldLnk")
.attr({
'download': filename,
'href': csvUrl
});
$('#lnkDwnldLnk')[0].click();
document.body.removeChild(link);
}
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