How to select multiple files for upload?

问题:

How to select multiple files for upload :

回答1:

This depends on the browser. Newer versions of firefox and chrome support this because they started to implement HTML5 specification. This is the syntax:

<input type="file" multiple=""/>

Firefox >= 3.6, Chrome >= 2, Safari >= 4 support multiple file input.

For older browsers the only good solutions are flash or javascript plugins. Here is a good resource for jquery uploaders ( some support multiple files ): http://creativefan.com/10-ajax-jquery-file-uploaders/

回答2:

In HTML5 you can set the multiple attribute on <input type="file">. This works in browsers supporting HTML5.

<input type="file" name="upload" multiple="multiple" />

In HTML4 your best bet is Flash or Java Applet. There are 3rd party libs available like Uploadify, SWFupload, JUpload and JumpLoader.

回答3:

I would definately at this point go with new HTML5 "multiple" attribute:

<input type="file" name="upload[]" multiple="multiple" />

The only viable alternative is FLASH plugins like swfupload.

However - there are multiple prublems with using FLASH for uploads, the main one foor me would be cookie bug:

FLASH plugins don't send cookies correctly. Each browser has it's own cookie storage.FLASH always sends cookies from IE even if you use Google Chrome for example. - result is that you loose cookies and sessions. there is a workaround - but it requires you to send session ID as GET or POST parameters which in turn makes your site vulnerable for session fixation.

回答4:

You could also use javascript plugins such as: http://code.google.com/p/noswfupload/

回答5:

Use the file input form element more than once, give it a different name and you have multiple upload fields on one page. No need to learn anything else.

回答6:

1. PHP is the back-end, PHP is not the thing which restricts you to use only "one" upload a time
2. HTML/JavaScript are the front/mid-end which cause the restrictions. (So add HTML to your questions tags)
3. If you use Flash (AS = ActionScript) you can still have PHP as back-end, as processor which handles the uploaded files.

回答7:

There is no html/javascript workaround. You would have to look to flash or java to be able to do this.

回答8:

As others have said, you have to use Flash to get multiple uploads. An alternative to uploadify is SWFUpload.

回答9:

Flash is the only option except HTML5.