如何向XHR對象添加額外的參數（在Dropzone.JS中）？

Question

我試圖上傳我的照片和標籤（逗號分隔的字符串）一起發送的參數tagname。

傳遞給Dropzone.JS的sending選項允許我在發送請求之前獲取XHR對象。

Dropzone.options.uploadDropzone({ 
    // ... 
    sending: function(file, xhr, formData){ 
     // but how to add my tags string to the params? 
     // any methods like setting the header: 
     // xhr.setRequestHeader("X-Requested-With", "XMLHttpRequest")? 
    } 
}) 

Answer 1

在JavaScript

var xhr = new XMLHttpRequest(); 
    xhr.open("POST", "FileUploadHandler.ashx"); 
    var fd = new FormData(); 
    fd.append("sFileTitle", document.getElementById('txtFileTitle').value); 

    xhr.send(fd); 

所以你會在表格數據追加數據使用鍵和值對

var fd = new FormData(); 
    fd.append("sFileTitle", document.getElementById('txtFileTitle').value); 
    Dropzone.options.uploadDropzone({ 
     // ... 
     sending: function(file, xhr, fd){ 
      // but how to add my tags string to the params? 
      // any methods like setting the header: 
      // xhr.setRequestHeader("X-Requested-With", "XMLHttpRequest")? 
     } 
    })