从JQuery文件输入中获取数据

I actually have a file input and I would like to retrieve the Base64 data of the file.

我实际上有一个文件输入，我想检索文件的Base64数据。

I tried:

我试着:

$('input#myInput')[0].files[0]

to retrieve the data. But it only provides the name, the length, the content type but not the data itself.

检索数据。但是它只提供名称、长度、内容类型，而不提供数据本身。

I actually need these data to send them to Amazon S3

实际上，我需要这些数据将它们发送到Amazon S3

I already test the API and when I send the data through html form with encode type "multipart/form-data" it works.

我已经对API进行了测试，当我通过html表单发送数据时，会使用编码类型的“multipart/form-data”进行编码。

I use this plugin : http://jasny.github.com/bootstrap/javascript.html#fileupload

我使用这个插件:http://jasny.github.com/bootstrap/javascript.html#fileupload

And this plugins gives me a preview of the picture and I retrieve data in the src attribute of the image preview. But when I send these data to S3 it does not work. I maybe need to encode the data like "multipart/form-data" but I don't know why.

这个插件为我提供了图片的预览，我在图像预览的src属性中检索数据。但是当我将这些数据发送到S3时，它就不起作用了。我可能需要对数据进行编码，比如“multipart/form-data”，但我不知道为什么。

Is there a way to retrieve these data without using an html form?

有没有一种不用html表单就能检索这些数据的方法?

7 个解决方案

#1

100

you can try FileReader API something like this.

你可以试试FileReader API。

<!DOCTYPE html>
<html>
<head>
<script>        
  function handleFileSelect()
  {               
    if (!window.File || !window.FileReader || !window.FileList || !window.Blob) {
      alert('The File APIs are not fully supported in this browser.');
      return;
    }   

    input = document.getElementById('fileinput');
    if (!input) {
      alert("Um, couldn't find the fileinput element.");
    }
    else if (!input.files) {
      alert("This browser doesn't seem to support the `files` property of file inputs.");
    }
    else if (!input.files[0]) {
      alert("Please select a file before clicking 'Load'");               
    }
    else {
      file = input.files[0];
      fr = new FileReader();
      fr.onload = receivedText;
      //fr.readAsText(file);
      fr.readAsDataURL(file);
    }
  }

  function receivedText() {
    document.getElementById('editor').appendChild(document.createTextNode(fr.result));
  }           

</script>
</head>
<body>
<input type="file" id="fileinput"/>
<input type='button' id='btnLoad' value='Load' onclick='handleFileSelect();'>
<div id="editor"></div>
</body>
</html>

7 个解决方案

#1

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