从Ajax下载文件（有点）

I have this ajax call in my GSP:

我在我的GSP中有这个ajax调用：

$.ajax({
    url: '${request.contextPath + '/Ticket/passAll'}',
    type: 'POST',
    data: data,
    success: function() {
        alert("Success");
    }
});

This is code block from my controller action:

这是我的控制器操作的代码块：

response.setHeader("Content-disposition", "attachment; filename=sample.csv")
response.contentType = "application/vnd.ms-excel"

def outs = response.outputStream
def cols = [:]

tickets.each() {
    outs << it.ticketNo + ";" + it.subject
    outs << "\n"
}

outs.flush()
outs.close()

I get tickets list from data that I pass from view via $.Ajax method. Than I format that data as CSV and than I want to export that data as CSV file but nothing happens. The data is send to client but there is no file for download as content-disposition is not well formed. What am I missing? I've tried to do something like:

我通过$ .Ajax方法从视图传递的数据中获取票证列表。比我将数据格式化为CSV并且我想将该数据导出为CSV文件但没有任何反应。数据被发送到客户端，但没有文件可供下载，因为内容配置不是很好。我错过了什么？我试过做类似的事情：

$.ajax({
    url: '${request.contextPath + '/Ticket/passAll'}',
    type: 'POST',
    data: aoData,
    dataType: 'text',
    success: function(result) {
        var uri = 'data:application/csv;charset=UTF-8,' + encodeURIComponent(result);
        window.open(uri, 'tiketi.csv');
    }
});

and in controller I generate plain string, but that way I get a file without extension which is unacceptable.

并在控制器中我生成纯字符串，但这样我得到一个没有扩展名的文件，这是不可接受的。

How can I achieve this? Thank you.

我怎样才能做到这一点？谢谢。

4 个解决方案

#1

You dont need to do it via ajax. The page will not redirect for file downloads.

你不需要通过ajax来做。该页面不会重定向文件下载。

#2

I guess the url property should be fixed as your quotes are colliding.

我猜url属性应该固定，因为你的引号是碰撞的。

Try with:

试试：

$.ajax({
    url: "${request.contextPath}/Ticket/passAll",
    type: 'POST',
    data: aoData,
    dataType: 'text',
    success: function(result) {
        var uri = 'data:application/csv;charset=UTF-8,' + encodeURIComponent(result);
        window.open(uri, 'tiketi.csv');
    }
});

#3

As far as I know, it's not possible to trigger file-downloads via AJAX. Instead you may do something like this (e.g. with jQuery):

据我所知，不可能通过AJAX触发文件下载。相反，你可以做这样的事情（例如使用jQuery）：

function downloadComplete(){ hideSpinner();}
function downloadStart(){ showSpinner();}

function download(){
    downloadStart()
    var urlParams = data // or e.g. $(form).serialize() 
    var downloadUrl = "${request.contextPath}/Ticket/passAll?" + urlParams 
    $("#download-iframe").remove()
    $('<iframe style="display:none" id="download-iframe" src="' + downloadUrl + '" onreadystatechange="downloadComplete()" onload="downloadComplete()">').appendTo('body');
}

You may have problems because it's a GET-request: "security" or too many arguments. But in normal it should be no problem.

您可能遇到问题，因为它是GET请求：“安全性”或者参数太多。但在正常情况下应该没问题。

#4

Im a little late on this one but stumbled upon it doing some research. This solution is a bit longer and cobbled together from various questions answered here. I think its a direct answer to this question and I have it working in an application.

我在这一点上有点晚了，但偶然发现它做了一些研究。这个解决方案有点长，并且从这里回答的各种问题拼凑而成。我认为这是对这个问题的直接回答，我让它在一个应用程序中工作。

<script>
function getCSV() {
console.log("in get csv");
  $.ajax({
      url: "<url string>",
      dataType: 'json',
      type: "post",
      data: {},
      success: function (data) {
          console.log(data);
          downloadCSV({filename: "<filename.csv", data: data.<array from 
                                      backend call>});
      },
      error: function () {
      }
  });
}
}
function downloadCSV(args) {
var data, filename, link;
var csv = convertArrayOfObjectsToCSV({
    data: args.data
});
if (csv == null) return;
filename = args.filename || 'export.csv';
if (!csv.match(/^data:text\/csv/i)) {
    csv = 'data:text/csv;charset=utf-8,' + csv;
}
data = encodeURI(csv);
link = document.createElement('a');
link.setAttribute('href', data);
link.setAttribute('download', filename);
link.click();
}
function convertArrayOfObjectsToCSV(args) {
var result, ctr, keys, columnDelimiter, lineDelimiter, data;
data = args.data || null;
if (data == null || !data.length) {
    return null;
}
columnDelimiter = args.columnDelimiter || ',';
lineDelimiter = args.lineDelimiter || '\n';
keys = Object.keys(data[0]);
result = '';
result += keys.join(columnDelimiter);
result += lineDelimiter;
data.forEach(function (item) {
    ctr = 0;
    keys.forEach(function (key) {
        if (ctr > 0) result += columnDelimiter;
        result += item[key];
        ctr++;
    });
    result += lineDelimiter;
});
return result;
}
</script>

The first function is a standard ajax call to get the array of data from a backend call. The next is to create the csv. The second line calls a third function that formats the csv file. The second function moves on from the csv creation and finally creates a dynamic link that is appended to the dom and clicked for the download. Seems the longer way round but works with standard ajax call to the backend.

第一个函数是标准的ajax调用，用于从后端调用获取数据数组。接下来是创建csv。第二行调用格式化csv文件的第三个函数。第二个函数从csv创建开始，最后创建一个动态链接，该链接附加到dom并单击以进行下载。似乎更长的路，但使用标准的ajax调用后端。

#1