如何验证输入类型文件字段

Question

<input id="document" type="file" multiple/>
 if($.trim($("#documnet").val()) === ""){
  alert("Upload Your document.");
  return false;
 }

But it is not working. And I want to upload only .zip extension.

Answer 1

您将document拼写错误为documnet

Answer 2

A word of caution, some non-desktop devices will show input fields, but not actually function. If your form will be used solely on desktop devices, this ins't a concern.

Though if your form is going to be used on other devices (mobile, tablet, smartTV), I'd recommend not having input[type=file] fields be required. It could make it impossible for those users to submit your form.