如果HTML文件输入字段为空，是否可以禁用表单提交？

问题描述

在一个仅包含一个

  
将所需的属性添加到输入中。它只能在支持它的浏览器中工作，所以你应该有一个JavaScript的替代方案（< form onSubmit =if（document.getElementById（'fileinput'）。value ==''）return false ;> 或者沿着这些行的东西）
 
In a form which contains only a
<input id="fileInput" name="BugReport" type="file" />
input field, I would like to disable the Submit button if the file input is empty (no file was chosen yet). Is there a recommended way to do this? 
 解决方案 
Add the required attribute to the input. It'll only work in browsers that support it, so you should have a JavaScript alternative (<form onSubmit="if(document.getElementById('fileinput').value == '') return false;"> or something along those lines).
                        
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