Ensuring Filesize Verification Prior to Upload on Internet Explorer Using Javascript

Question

Ensuring Filesize Verification Prior to Upload on Internet Explorer Using Javascript

Can JavaScript be used to verify a file's size before it is uploaded to the server at the client side?

This application is developed using EXTJS and Java and is limited to Internet Explorer 7 on Windows XP machines. ActiveX cannot be used.

The workflow is as follows: A user selects a file for upload. Validation immediately checks for file type and size. If the file size exceeds the limit, an error prompt is displayed. If the file size is within the limit, the full file path is sent to the server (Java servlet) for upload.

Is it possible to achieve file size checking and reading the full file path using JavaScript?

javascript extjs

Answer 1

Answer №1

One way to achieve this is by using ActiveX Objects.

<html>
<head>
<script>
function checkFileSize() {
    var fso = new ActiveXObject("Scripting.FileSystemObject");
    var filepath = document.getElementById('fileInput').value;
    var file = fso.GetFile(filepath);
    var size = file.size;
    alert("The file size is: " + size + " bytes");
}
</script>
</head>
<body>
<form>
<input type="file" id="fileInput">
<input type="button" value="Check File Size" onclick="checkFileSize()">
</form>
</body>
</html>

Answer 2

One way to achieve this is by using ActiveX Objects.

<html>
<head>
<script>
function checkFileSize() {
    var fso = new ActiveXObject("Scripting.FileSystemObject");
    var filepath = document.getElementById('fileInput').value;
    var file = fso.GetFile(filepath);
    var size = file.size;
    alert("The file size is: " + size + " bytes");
}
</script>
</head>
<body>
<form>
<input type="file" id="fileInput">
<input type="button" value="Check File Size" onclick="checkFileSize()">
</form>
</body>
</html>

Answer 3

Answer №2

At present, there is no universal method for checking the size of a file uploaded from a web browser. The HTML5 File API allows for this functionality, but it is not supported in MSIE7 - however, it is anticipated to be included in MSIE10.

For security reasons, it is deliberately not possible to access the full path of an uploaded file, as this could potentially reveal sensitive information, such as the user's name.

Answer 4

At present, there is no universal method for checking the size of a file uploaded from a web browser. The HTML5 File API allows for this functionality, but it is not supported in MSIE7 - however, it is anticipated to be included in MSIE10.

For security reasons, it is deliberately not possible to access the full path of an uploaded file, as this could potentially reveal sensitive information, such as the user's name.

Answer 5

Answer №3

The inability to access the client's filesystem is intentional to prevent security threats and potential attacks by browsers and javascript.

Allowing such access could be detrimental and pose a risk to user data.

Implementing File Size Restrictions with jQuery Before Uploading

Answer 6

The inability to access the client's filesystem is intentional to prevent security threats and potential attacks by browsers and javascript.

Allowing such access could be detrimental and pose a risk to user data.

Implementing File Size Restrictions with jQuery Before Uploading

Answer 7

Answer №4

Kindly test the following code snippet:

<html>
<head>
<script type="text/javascript" src="http://code.jquery.com/jquery-1.7.1.js"></script>
<script type="text/javascript">
$(function() {
$("document").ready(function(){
        $("#myFile1").change(function() {

        var f1=document.getElementById("myFile1").value;
        if((f.size||f.fileSize)==09765625)
        {
        alert("file size is less than 1mb");
        }
        else
        {
        alert("file size should not exceed more than 1mb");
                $(this).val($.data(this, 'f'));
        return false;
        }

            });
});
})
</script>
</head>
<body>

<input type='file' name="file" id="myFile1" />

</body>
</html>

Answer 8

Kindly test the following code snippet:

<html>
<head>
<script type="text/javascript" src="http://code.jquery.com/jquery-1.7.1.js"></script>
<script type="text/javascript">
$(function() {
$("document").ready(function(){
        $("#myFile1").change(function() {

        var f1=document.getElementById("myFile1").value;
        if((f.size||f.fileSize)==09765625)
        {
        alert("file size is less than 1mb");
        }
        else
        {
        alert("file size should not exceed more than 1mb");
                $(this).val($.data(this, 'f'));
        return false;
        }

            });
});
})
</script>
</head>
<body>

<input type='file' name="file" id="myFile1" />

</body>
</html>

Ensuring Filesize Verification Prior to Upload on Internet Explorer Using Javascript

Answer №1

Answer №2

Answer №3

Answer №4

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