Detecting File Size with jQuery

Detecting FileSize – jQuery

Hey everyone,

Just a quick post on how to detect a file’s size with jQuery. I’m currently using a version of this for basic client side validation:

<form action="upload" enctype="multipart/form-data" method="post">
 
    Upload image:
    <input id="image-file" type="file" name="file" />
</form>
$(document).ready(function(){
    $('#image-file').bind('change', function() {
 
        var fileSize = this.files && this.files.length > 0 && this.files[0].size ? this.files[0].size / 1024 / 1024 : 0;
 
        if(fileSize > 0){
            $('body').append('<div class="file valid">' + fileSize + ' MB</div>');  
        }
        else{
            $('body').append('<div class="file invalid">' + fileSize + ' MB</div>'); 
        }            
    });
});
.file{
padding: 5px 7px;
border-radius: 3px;
background-color: green;
color: white;
margin: 5px;
}
 
.file.valid{
background-color: rgb(127, 197, 127);
}
 
.file.invalid{
background-color: rgb(197, 127, 127);
}

Here’s the link to the full fiddle: http://jsfiddle.net/nLLMF/

There’re also a whole heap of other options listed on this StackOverflow post if you’re chasing something a bit more robust: http://stackoverflow.com/a/13249924/522859

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