[javascript] Get file size before uploading

I had the same problem and seems like we haven't had an accurate solution. Hope this can help other people.

After take time exploring around, I finally found the answer. This is my code to get file attach with jQuery:

var attach_id = "id_of_attachment_file";
var size = $('#'+attach_id)[0].files[0].size;
alert(size);

This is just the example code for getting the file size. If you want do other stuffs, feel free to change the code to satisfy your needs.

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