Here is the article title: Can You Determine File Size Before Uploading with AJAX/PHP?

Determining File Size Before Upload

Want to know if you can find out the size of a file before uploading it? If using AJAX/PHP and in the change event of the input file, is there any way?

Answer

For the following HTML:

<code class="html"><input type="file" id="myFile" /></code>

Try this:

<code class="javascript">// 绑定到输入字段的 onchange 事件
$('#myFile').bind('change', function() {

  // this.files[0].size 获取文件的大小。
  alert(this.files[0].size);

});</code>

See the following thread:

How to check file input size with jQuery?

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