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An object of this type is returned by the files property of the HTML <input> element; this lets you access the list of files selected with the <input type="file"> element. It's also used for a list of files dropped into web content when using the drag and drop API; see the DataTransfer object for details on this usage.
Note: Prior to Gecko 1.9.2, the input element only supported a single file being selected at a time, meaning that the FileList would contain only one file. Starting with Gecko 1.9.2, if the input element's multiple attribute is true, the FileList may contain multiple files.
Using the file list
All <input> element nodes have a files array on them which allows access to the items in this list. For example, if the HTML includes the following file input:
<input id="fileItem" type="file">
다음 코드 행은 노드의 파일 목록에있는 첫 번째 파일을 File 객체로 가져옵니다.
var file = document.getElementById('fileItem').files[0];
Method overview
File item(index); |
Properties
| Attribute | Type | Description |
length |
integer |
목록에있는 파일의 수를 나타내는 읽기 전용 값. |
Methods
item()
파일리스트의 지정된 인덱스에있는 파일을 나타내는 File 객체를 리턴합니다.
File item( index );
Parameters
index- The zero-based index of the file to retrieve from the list.
Return value
The File representing the requested file.
Example
This example iterates over all the files selected by the user using an input element:
// fileInput is an HTML input element: <input type="file" id="myfileinput" multiple>
var fileInput = document.getElementById("myfileinput");
// files is a FileList object (similar to NodeList)
var files = fileInput.files;
var file;
// loop through files
for (var i = 0; i < files.length; i++) {
// get item
file = files.item(i);
//or
file = files[i];
alert(file.name);
}
Here is a complete example.
<!DOCTYPE HTML>
<html>
<head>
</head>
<body>
<!--multiple is set to allow multiple files to be selected-->
<input id="myfiles" multiple type="file">
</body>
<script>
var pullfiles=function(){
// love the query selector
var fileInput = document.querySelector("#myfiles");
var files = fileInput.files;
// cache files.length
var fl = files.length;
var i = 0;
while ( i < fl) {
// localize file var in the loop
var file = files[i];
alert(file.name);
i++;
}
}
// set the input element onchange to call pullfiles
document.querySelector("#myfiles").onchange=pullfiles;
//a.t
</script>
</html>
Specification
- File upload state (HTML5 working draft)