jQuery查找文件扩展名(来自字符串) [英] jQuery find file extension (from string)

问题描述

我想知道jQuery是否有可能基于返回的字符串找到文件扩展名?

I was wondering if it was possible for jQuery to find a file extension based on a returned string?

文件名(字符串)将传递给函数(openFile)，我希望该函数根据传递的文件(图像文件或pdf文件)来做不同的事情.

A filename (string) will be passed to a function (openFile) and I wanted that function to do different things based on what file has been passed through, it could be image files or pdf files.

function openFile(file) { 

  //if .jpg/.gif/.png do something

  //if .zip/.rar do something else

  //if .pdf do something else

};

我一直在寻找可以找到文件扩展名的东西，但似乎什么也找不到.

I've been looking for something that will find the file's extension but I can't seem to find anything.

推荐答案

这样的事情怎么样.

测试实际示例: http://jsfiddle.net/6hBZU/1 /

假定字符串始终以扩展名结尾

It assumes that the string will always end with the extension:

function openFile(file) {
    var extension = file.substr( (file.lastIndexOf('.') +1) );
    switch(extension) {
        case 'jpg':
        case 'png':
        case 'gif':
            alert('was jpg png gif');  // There's was a typo in the example where
        break;                         // the alert ended with pdf instead of gif.
        case 'zip':
        case 'rar':
            alert('was zip rar');
        break;
        case 'pdf':
            alert('was pdf');
        break;
        default:
            alert('who knows');
    }
};

openFile("somestring.png");

编辑:我错误地删除了openFile("somestring.png");中的部分字符串.已更正.不过，在实时示例"中有它.

EDIT: I mistakenly deleted part of the string in openFile("somestring.png");. Corrected. Had it in the Live Example, though.

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