用Ajax上传时，PHP $ _FILES为空

Question

我有带有输入附件的表单：

<form enctype="multipart/form-data" action="" method="post" id="sendInvoiceForm">
         .....
        <div class="templateDiv">
            <span class="invoice_email_label">Email attachments:</span>
            <input name="email_attachment[]" type="file" multiple="">
        </div>
        <div class="templateDiv">
            <button id="send_invoice_btn" class="bigButton redButton">Send</button>

        </div>
    </form>

和js：

                    data = new FormData($("#sendInvoiceForm")[0]);
                    data.append('flagSend', 1);
                    data.append('send_invoice_subject', sendInvoiceSubject);
               ....
     $.ajax({
                    type: 'POST',
                    data: data,
                    processData: false,
                    contentType: false,
                    url: sJSUrlSavePdfInvoiceToServer,
                    dataType: 'json',
                    success: function (data) {
                        if (data.msg === 'Error. This invoice number  exists.') {
                            alert(data.msg);
                        } else {
                            ...
                        }
                    },
                    error: function () {
                        alert('error');
                    }
                });

我测试了，似乎没有用。 所有数据都能顺利通过，但文件无法通过。 当我print_r $ _FILES时，它是空的。 我怎么了 谢谢。

Answer 1

这对我有用-

 var form_data = new FormData($('#submitForm')[0]);

        $.ajax({
            url: "<?php echo base_url() . 'backends/update_documents' ?>",
            type: "POST",
            dataType: 'json', // what to expect back from the PHP script, if anything
            cache: false,
            contentType: false,
            processData: false,
            data: form_data,
            success: function (res) {
                // console.log(res);
            },
            error: function (xhr, ajaxOptions, thrownError) {
                //console.log(xhr);
            }
        });

您可以尝试使用缓存：false并提及按钮，键入=“ button”

Answer 2

这就是我要做的工作，并附加了formdata，

var formData = new FormData(your_form);
 // for multiple files , because i need to check

new_files是类，我使用是因为我正在动态创建表单

$.each($(".new_files"), function (i, obj) {
//                console.log(obj.files);
        $.each(obj.files, function (j, file) {
              var max_size = 5120000;
              var file_type= file.type;
              var match = ["image/jpeg", "image/png", "image/jpg", "application/pdf"];
            // after validation etc
       //   append formdata
           formData.append('file[' + j + ']', file);
            });
  });
  // if you want something else, 
  formData.append("id", $('#kreditornr').val());
  // ajax

  $.ajax({
     type: "POST",
     url: "url",
     data: formData,
     contentType: false, // The content type used when sending data to the server.
     cache: false, // To unable request pages to be cached
     processData: false, // To send DOMDocument or non processed data file it is set to false
       success: function (data) {
          // success
       }
    });

Answer 3

首先删除dataType: 'json'

然后，如果仍然显示错误，请更换

data = new FormData($("#sendInvoiceForm")[0]);

与

data = new FormData($("#sendInvoiceForm").prop('files')[0]);

Answer 4

尝试通过发送数据：

 data: $('#sendInvoiceForm').serialize();