如果HTML文件输入字段为空,是否可以禁用表单提交? [英] Can a form submit be disabled if a HTML file input field is empty?
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问题描述
< input id =fileInputname =BugReporttype =文件/>
输入字段,如果文件输入是空的,我想禁用Submit按钮还没有选择)。有没有推荐的方法来做到这一点?
解决方案
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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