Get file size before uploading

Question

Is there any way to find out the file size before uploading the file using AJAX / PHP in change event of input file?

Answer 1

You can use PHP filesize function. During upload using ajax, please check the filesize first by making a request an ajax request to php script that checks the filesize and return the value.

Answer 2

Best solution working on all browsers ;)

function GetFileSize(fileid) {
    try {
        var fileSize = 0;
        // for IE
        if(checkIE()) { //we could use this $.browser.msie but since it's deprecated, we'll use this function
            // before making an object of ActiveXObject, 
            // please make sure ActiveX is enabled in your IE browser
            var objFSO = new ActiveXObject("Scripting.FileSystemObject");
            var filePath = $("#" + fileid)[0].value;
            var objFile = objFSO.getFile(filePath);
            var fileSize = objFile.size; //size in b
            fileSize = fileSize / 1048576; //size in mb 
        }
        // for FF, Safari, Opeara and Others
        else {
            fileSize = $("#" + fileid)[0].files[0].size //size in b
            fileSize = fileSize / 1048576; //size in mb 
        }
        alert("Uploaded File Size is" + fileSize + "MB");
    }
    catch (e) {
        alert("Error is :" + e);
    }
}

from http://www.dotnet-tricks.com/Tutorial/jquery/HHLN180712-Get-file-size-before-upload-using-jquery.html

UPDATE : We'll use this function to check if it's IE browser or not

function checkIE() {
    var ua = window.navigator.userAgent;
    var msie = ua.indexOf("MSIE ");

    if (msie > 0 || !!navigator.userAgent.match(/Trident.*rv\:11\./)){  
        // If Internet Explorer, return version number
        alert(parseInt(ua.substring(msie + 5, ua.indexOf(".", msie))));
    } else {
        // If another browser, return 0
        alert('otherbrowser');
    }

    return false;
}

Answer 3

$(document).ready(function() {
  $('#openFile').on('change', function(evt) {
    console.log(this.files[0].size);
  });
});

<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
<form action="upload.php" enctype="multipart/form-data" method="POST" id="uploadform">
  <input id="openFile" name="img" type="file" />
</form>

Answer 4

ucefkh's solution worked best, but because $.browser was deprecated in jQuery 1.91, had to change to use navigator.userAgent:

function IsFileSizeOk(fileid) {
    try {
        var fileSize = 0;
        //for IE
        if (navigator.userAgent.match(/msie/i)) {
            //before making an object of ActiveXObject, 
            //please make sure ActiveX is enabled in your IE browser
            var objFSO = new ActiveXObject("Scripting.FileSystemObject");
            var filePath = $("#" + fileid)[0].value;
            var objFile = objFSO.getFile(filePath);
            var fileSize = objFile.size; //size in b
            fileSize = fileSize / 1048576; //size in mb 
        }
        //for FF, Safari, Opeara and Others
        else {
            fileSize = $("#" + fileid)[0].files[0].size //size in b
            fileSize = fileSize / 1048576; //size in mb 
        }
        return (fileSize < 2.0);
    }
    catch (e) {
        alert("Error is :" + e);
    }
}

Answer 5

Personally, I would say Web World's answer is the best today, given HTML standards. If you need to support IE < 10, you will need to use some form of ActiveX. I would avoid the recommendations that involve coding against Scripting.FileSystemObject, or instantiating ActiveX directly.

In this case, I have had success using 3rd party JS libraries such as plupload which can be configured to use HTML5 apis or Flash/Silverlight controls to backfill browsers that don't support those. Plupload has a client side API for checking file size that works in IE < 10.

Answer 6

Here's a simple example of getting the size of a file before uploading. It's using jQuery to detect whenever the contents are added or changed, but you can still get files[0].size without using jQuery.

$(document).ready(function() {
  $('#openFile').on('change', function(evt) {
    console.log(this.files[0].size);
  });
});

<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
<form action="upload.php" enctype="multipart/form-data" method="POST" id="uploadform">
  <input id="openFile" name="img" type="file" />
</form>

Here's a more complete example, some proof of concept code to Drag and Drop files into FormData and upload via POST to a server. It includes a simple check for file size.