文件输入问题 - 限制所选文件的数量 [英] File input problems - Limit number of selected files

问题描述

1）首先，我有一个< input现在我可以根据需要选择尽可能多的图片，但是我需要将这个数字限制为最大10。我怎样才能做到这一点？

2）我的upload.php文件看起来像处理多个上传的图片？我从来没有机会单独上传图片，但现在我坚持这一点，我需要这个。我很困惑...

请帮忙吗？

解决方案

1您可以使用javascript来检测所选文件的数量，如果超过10， >

  $（'fileinput'）。onchange = function（）{if（this.files.length> 10）alert（'to many files '）} 
 //防止提交if 
 $（'form'）。onsubmit = function（）{if（this.files.length> 10）return false;} 
  

你甚至可以通过加入所有.files [i] .fileSize来检查组合文件大小是否不大。 p>

<2>请参阅： http ：//php.net/manual/en/features.file-upload.multiple.php
（短版本;使用：$ _FILES ['userfile'] ['name'] [0]， $ _FILES ['userfile'] ['tmp_name'] [0]，$ _FILES ['userfile'] ['size'] [0]和$ _FILES ['userfile'] ['type'] [0]）

I'm putting two questions in this "Question"...

1) First of all, I have a <input type="file" name="file[]" multiple="multiple" />, Now I can select as many images as I want, but I need to limit this number to 10 maximally. How would I do this?

2) What would my upload.php file look like to handle multiple uploaded images? I never had the chance to work on anything more than single image uploading, but now I'm stuck at this and I need this. I'm quite confused...

Help please?

解决方案

1 You could use javascript to detect the number of files selected, and give a warning if it's more than 10

$('fileinput').onchange=function(){if(this.files.length>10)alert('to many files')}
//prevent submitting if to many
$('form').onsubmit=function(){if(this.files.length>10)return false;}

you could even check if the combined filesize isn't to big by adding up all .files[i].fileSize

2 see: http://php.net/manual/en/features.file-upload.multiple.php (short version; use: $_FILES['userfile']['name'][0], $_FILES['userfile']['tmp_name'][0], $_FILES['userfile']['size'][0], and $_FILES['userfile']['type'][0])

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