JQuery - 文件属性 [英] JQuery - File attributes

问题描述

在选择文件后尝试从输入字段访问文件属性.试过了，但得到错误文件未定义"

Trying to access file attributes from an input field after a file is selected. Tried this but get the error 'file not defined'

var file = $("#uploadedfile").prop("files")[0];
var fileName = file.fileName;
var fileSize = file.fileSize;
alert("Uploading: "+fileName+" @ "+fileSize+"bytes");

推荐答案

如果 #uploadedfile 是类型为file"的输入:

If #uploadedfile is an input with type "file" :

var file = $("#uploadedfile")[0].files[0];
var fileName = file.name;
var fileSize = file.size;
alert("Uploading: "+fileName+" @ "+fileSize+"bytes");

通常这会在更改事件上触发，如下所示:

Normally this would fire on the change event, like so:

$("#uploadedfile").on("change", function(){
   var file = this.files[0],
       fileName = file.name,
       fileSize = file.size;
   alert("Uploading: "+fileName+" @ "+fileSize+"bytes");
   CustomFileHandlingFunction(file);
});

FIDDLE

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