防止使用Javascript(JQuery)更改文件输入 [英] Prevent file input from changing with Javascript (JQuery)

问题描述

如果我有条件地告诉用户文件太大，我试图防止文件输入被更改，但是即使捕获更改并防止默认设置，它仍然会被填充，即:

I'm trying to prevent a file input being changed if I conditionally tell the user the file is too large, but even capturing the change and preventing default, it's still filled in ie:

  // CHECK FILE ISNT ABOVE 500MB ON CHANGE
      $(".upload-file").change(function (e) {

        // conditional checks
        var fileSize = $('.upload-file').get(0).files[0].size; // in bytes

        if (fileSize > 500000000) {
          e.preventDefault();
          swal('File size is more than 500 MB, please upload a smaller file. Support for larger files will be rolled out soon.');
          return false;
        }



      });

这是我的代码，我在做什么错?

Here's my code, what am I doing wrong?

推荐答案

如果要重置文件输入:

$(".upload-file").val(null);

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