Trying to export data from database to excel in django

问题

views.py

def export(request):
    print('start')
    ourid = request.POST.getlist("terid")
    queryset = Case_Info.objects.filter(id__in=list(map(int, ourid)))
    Case_Detail = Case_Info_Resource()
    print(ourid)
    dataset = Case_Detail.export(queryset)  # error in this line
    response = HttpResponse(
        dataset.xls, content_type='application/vnd.ms-excel')
    response['Content-Disposition'] = 'attachment; filename="persons.xls"'
    print('end')
    return response

Ajax Script

$(document).ready(function () {
    $('#Download').click(function () {
        console.log("clicked!")
        var list = [];
        $("input:checkbox[name='checkbox']:checked").each(function () {
            list.push($(this).val());
        });
        $('#Download').attr('disabled', 'disabled');
        $.ajax({
            url: '/Account_Manager/Download/',
            type: 'POST',
            data: {
                'terid': list,
                'csrfmiddlewaretoken': '{{csrf_token}}',
            },
            timeout: 30000,
            traditional: true,
            dataType: 'text',
            success: function () {
                alert("The best cricketers are: " + list.join(", "));
                $('#Download').removeAttr('disabled');
            }
        });
    });
});

What I am trying to do is pass several ids from the front end to the back and then export data from the database accordingly. everything is working fine till this following line.

dataset = Case_Detail.export(queryset)

after this line, it again reaches to the beginning of the function that results in the blank list that results in an empty excel file

回答1:

So, finally, I have achieved what I want.

I want to pass selected id's (multiple ids) from the frontend to the backend, and then fetch data from the database accordingly. After that, I want to export the data into excel or CSV format.

Ajax:

<script>

    $(document).ready(function (e) {
        $('#Download').click(function (e) {
            e.preventDefault()
            console.log("clicked!")
            var list = [];
            $("input:checkbox[name='checkbox']:checked").each(function () {
                list.push($(this).val());
            });
            $.ajax({
                url: '/Account_Manager/Download/',
                type: 'POST',
                data: {
                    'terid': list,
                    'csrfmiddlewaretoken': '{{csrf_token}}',
                },
                traditional: true,
                dataType: 'text',
                success: function (response, status, xhr) {
                    var filename = "persons.csv";
                    var disposition = xhr.getResponseHeader('Content-Disposition');
                    if (disposition && disposition.indexOf('attachment') !== -1) {
                        var filenameRegex = /filename[^;=\n]*=((['"]).*?\2|[^;\n]*)/;
                        var matches = filenameRegex.exec(disposition);
                        if (matches != null && matches[1]) filename = matches[1].replace(/['"]/g, '');
                    }

                    var type = xhr.getResponseHeader('Content-Type');
                    var blob = new Blob([response], {type: type});

                    if (typeof window.navigator.msSaveBlob !== 'undefined') {
                        // IE workaround for "HTML7007: One or more blob URLs were revoked by closing the blob for which they were created. These URLs will no longer resolve as the data backing the URL has been freed."
                        window.navigator.msSaveBlob(blob, filename);
                    } else {
                        var URL = window.URL || window.webkitURL;
                        var downloadUrl = URL.createObjectURL(blob);

                        if (filename) {
                            // use HTML5 a[download] attribute to specify filename
                            var a = document.createElement("a");
                            // safari doesn't support this yet
                            if (typeof a.download === 'undefined') {
                                window.location.href = downloadUrl;
                            } else {
                                a.href = downloadUrl;
                                a.download = filename;
                                document.body.appendChild(a);
                                a.click();
                            }
                        } else {
                            window.location.href = downloadUrl;
                        }

                        setTimeout(function () {
                            URL.revokeObjectURL(downloadUrl);
                        }, 100); // cleanup
                    }
                }
            });

        });
    });
</script>

Person.csv is the file I am passing through views.py

View.py

def export(request):
    ourid = request.POST.getlist("terid")
    queryset = Case_Info.objects.filter(id__in=list(map(int, ourid)))
    dataset = Case_Info_Resource().export(queryset)
    response = HttpResponse(dataset.csv, content_type='text/csv')
    response['Content-Disposition'] = 'attachment; filename="persons.csv"'
    return response

If your dataset replays an empty list please check the console of developer tab for error in js file you included in the document, and make sure that you do not include any js file twice in the same file.

Thanks to everybody who helped me

来源：https://stackoverflow.com/questions/63356184/trying-to-export-data-from-database-to-excel-in-django