我知道有很多这种性质的问题,但我需要使用JavaScript来做到这一点。我使用Dojo 1.8并在数组中拥有所有属性信息,它看起来像这样:
[["name1", "city_name1", ...]["name2", "city_name2", ...]]
知道我如何在客户端将此导出为CSV吗?
我知道有很多这种性质的问题,但我需要使用JavaScript来做到这一点。我使用Dojo 1.8并在数组中拥有所有属性信息,它看起来像这样:
[["name1", "city_name1", ...]["name2", "city_name2", ...]]
知道我如何在客户端将此导出为CSV吗?
当前回答
这里有两个问题:
如何将数组转换为csv字符串 如何将该字符串保存到文件
第一个问题的所有答案(除了millimetric给出的答案)似乎都有些夸张。Milimetric提供的方法不包括其他要求,比如用引号括住字符串或转换对象数组。
以下是我的看法:
对于一个简单的csv,一个map()和一个join()就足够了:
var test_array = [["name1", 2, 3], ["name2", 4, 5], ["name3", 6, 7], ["name4", 8, 9], ["name5", 10, 11]];
var csv = test_array.map(function(d){
return d.join();
}).join('\n');
/* Results in
name1,2,3
name2,4,5
name3,6,7
name4,8,9
name5,10,11
此方法还允许您在内部连接中指定除逗号之外的列分隔符。例如一个制表符:d.join('\t')
另一方面,如果你想正确地将字符串括在引号""中,那么你可以使用一些JSON魔法:
var csv = test_array.map(function(d){
return JSON.stringify(d);
})
.join('\n')
.replace(/(^\[)|(\]$)/mg, ''); // remove opening [ and closing ]
// brackets from each line
/* would produce
"name1",2,3
"name2",4,5
"name3",6,7
"name4",8,9
"name5",10,11
如果你有一个这样的对象数组:
var data = [
{"title": "Book title 1", "author": "Name1 Surname1"},
{"title": "Book title 2", "author": "Name2 Surname2"},
{"title": "Book title 3", "author": "Name3 Surname3"},
{"title": "Book title 4", "author": "Name4 Surname4"}
];
// use
var csv = data.map(function(d){
return JSON.stringify(Object.values(d));
})
.join('\n')
.replace(/(^\[)|(\]$)/mg, '');
其他回答
ES6的一个箭头函数:
const dataToCsvURI = (data) => encodeURI(
`data:text/csv;charset=utf-8,${data.map((row, index) => row.join(',')).join(`\n`)}`
);
然后:
window.open(
dataToCsvURI(
[["name1", "city_name1"/*, ...*/], ["name2", "city_name2"/*, ...*/]]
)
);
如果有人在reactjs中需要这个,react-csv就在那里
这个库有很大帮助:https://www.npmjs.com/package/json-to-csv-in-browser
它自动将json数组转换为csv文件,甚至为您提供下载功能,以防您想提示web用户下载csv文件。 它用很少的代码就像一个魅力。
import { JsonArray, download } from 'json-to-csv-in-browser'
const arr = [
{name : ` vader`, age : 53},
{name : "what", age : 38},
{name : "ever", age : 22}
]
const jsonArray = new JsonArray(arr);
const str = jsonArray.convertToCSVstring();
download("my.csv", str);
干杯!
编辑:再测试一下,如果你的值上有逗号,它就不能很好地工作了
基于上面的答案,我创建了这个函数,并在IE 11、Chrome 36和Firefox 29上进行了测试
function exportToCsv(filename, rows) {
var processRow = function (row) {
var finalVal = '';
for (var j = 0; j < row.length; j++) {
var innerValue = row[j] === null ? '' : row[j].toString();
if (row[j] instanceof Date) {
innerValue = row[j].toLocaleString();
};
var result = innerValue.replace(/"/g, '""');
if (result.search(/("|,|\n)/g) >= 0)
result = '"' + result + '"';
if (j > 0)
finalVal += ',';
finalVal += result;
}
return finalVal + '\n';
};
var csvFile = '';
for (var i = 0; i < rows.length; i++) {
csvFile += processRow(rows[i]);
}
var blob = new Blob([csvFile], { type: 'text/csv;charset=utf-8;' });
if (navigator.msSaveBlob) { // IE 10+
navigator.msSaveBlob(blob, filename);
} else {
var link = document.createElement("a");
if (link.download !== undefined) { // feature detection
// Browsers that support HTML5 download attribute
var url = URL.createObjectURL(blob);
link.setAttribute("href", url);
link.setAttribute("download", filename);
link.style.visibility = 'hidden';
document.body.appendChild(link);
link.click();
document.body.removeChild(link);
}
}
}
例如: https://jsfiddle.net/jossef/m3rrLzk0/
这个解决方案应该适用于Internet Explorer 10+, Edge,新旧版本的Chrome, FireFox, Safari, ++
已接受的答案不能在IE和Safari中使用。
// Example data given in question text var data = [ ['name1', 'city1', 'some other info'], ['name2', 'city2', 'more info'] ]; // Building the CSV from the Data two-dimensional array // Each column is separated by ";" and new line "\n" for next row var csvContent = ''; data.forEach(function(infoArray, index) { dataString = infoArray.join(';'); csvContent += index < data.length ? dataString + '\n' : dataString; }); // The download function takes a CSV string, the filename and mimeType as parameters // Scroll/look down at the bottom of this snippet to see how download is called var download = function(content, fileName, mimeType) { var a = document.createElement('a'); mimeType = mimeType || 'application/octet-stream'; if (navigator.msSaveBlob) { // IE10 navigator.msSaveBlob(new Blob([content], { type: mimeType }), fileName); } else if (URL && 'download' in a) { //html5 A[download] a.href = URL.createObjectURL(new Blob([content], { type: mimeType })); a.setAttribute('download', fileName); document.body.appendChild(a); a.click(); document.body.removeChild(a); } else { location.href = 'data:application/octet-stream,' + encodeURIComponent(content); // only this mime type is supported } } download(csvContent, 'dowload.csv', 'text/csv;encoding:utf-8');
运行代码片段将下载csv格式的模拟数据
归功于dandavis https://stackoverflow.com/a/16377813/1350598
我添加到Xavier Johns函数也包括字段头,如果需要,使用jQuery。美元的。对于原生javascript循环,每个位都需要更改
function exportToCsv(filename, rows, headers = false) {
var processRow = function (row) {
row = $.map(row, function(value, index) {
return [value];
});
var finalVal = '';
for (var j = 0; j < row.length; j++) {
if(i == 0 && j == 0 && headers == true){
var ii = 0;
$.each(rows[i], function( index, value ) {
//console.log(index);
var fieldName = index === null ? '' : index.toString();
//console.log(fieldName);
var fieldResult = fieldName.replace(/"/g, '""');
//console.log(fieldResult);
if (fieldResult.search(/("|,|\n)/g) >= 0){
fieldResult = '"' + fieldResult + '"';
}
//console.log(fieldResult);
if (ii > 0){
finalVal += ',';
finalVal += fieldResult;
}else{
finalVal += fieldResult;
}
ii++;
//console.log(finalVal);
});
finalVal += '\n';
//console.log('end: '+finalVal);
}
var innerValue = row[j] === null ? '' : row[j].toString();
if (row[j] instanceof Date) {
innerValue = row[j].toLocaleString();
};
var result = innerValue.replace(/"/g, '""');
if (result.search(/("|,|\n)/g) >= 0){
result = '"' + result + '"';
}
if (j > 0){
finalVal += ',';
finalVal += result;
}else{
finalVal += result;
}
}
return finalVal + '\n';
};
var csvFile = '';
for (var i = 0; i < rows.length; i++) {
csvFile += processRow(rows[i]);
}
var blob = new Blob([csvFile], { type: 'text/csv;charset=utf-8;' });
if (navigator.msSaveBlob) { // IE 10+
navigator.msSaveBlob(blob, filename);
}else{
var link = document.createElement("a");
if (link.download !== undefined) { // feature detection
// Browsers that support HTML5 download attribute
var url = URL.createObjectURL(blob);
link.setAttribute("href", url);
link.setAttribute("download", filename);
link.style.visibility = 'hidden';
document.body.appendChild(link);
link.click();
document.body.removeChild(link);
}
}
}