检查 HTML5 拖放文件类型 [英] Checking HTML5 drag and drop file type

问题描述

我想将拖放区的背景颜色更改为绿色或红色，具体取决于包含的拖拽负载是否包含支持的文件类型 (JPEG).

I'd like to change drop zone background color to green or red depending on whether the contained drag over payload contains supported file types (JPEG).

• Gecko 和 Webkit 是否支持确定拖放文件的文件类型?

• Do Gecko and Webkit support determining the file type of drag and drop files?

如何在这两种浏览器中提取文件类型?

How one can extract the file type in these two browsers?

我找到了 event.dataTransfer.types API，但对于 Firefox，它似乎填充了 application/x-moz-file，因此我认为我做错了.

I have found event.dataTransfer.types API, but for Firefox it seems to be populated with application/x-moz-file and thus I think I am doing something wrong.

推荐答案

您可以使用文件对象在 Gecko 和 webkit 支持的浏览器中获取文件类型.

You can get the file types in Gecko and webkit supported browsers using file object.

var files =e.dataTransfer.files||e.target.files; // File list

文件对象返回名称、类型和大小.您也可以获取上次修改日期.

The file object returns Name,Type and size. you can get last modified date too.

var mimeType= files[0].type; //mime type of file list first entry

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