I have a form with file upload capabilities and I would like to be able to have some nice client side error reporting if the file the user is trying to upload is too big, is
<form id="uploadForm" class="disp-inline" role="form" action="" method="post" enctype="multipart/form-data">
<input type="file" name="file" id="file">
</form>
<button onclick="checkSize();"></button>
<script>
function checkSize(){
var size = $('#uploadForm')["0"].firstChild.files["0"].size;
console.log(size);
}
</script>
I found this to be the easiest if you don't plan on submitted the form through standard ajax / html5 methods, but of course it works with anything.
NOTES:
var size = $('#uploadForm')["0"]["0"].files["0"].size;
This used to work, but it doesn't in chrome anymore, i just tested the code above and it worked in both ff and chrome (lastest). The second ["0"] is now firstChild.
I am posting my solution too, used for an ASP.NET FileUpload
control.
Perhaps someone will find it useful.
$(function () {
$('<%= fileUploadCV.ClientID %>').change(function () {
//because this is single file upload I use only first index
var f = this.files[0]
//here I CHECK if the FILE SIZE is bigger than 8 MB (numbers below are in bytes)
if (f.size > 8388608 || f.fileSize > 8388608)
{
//show an alert to the user
alert("Allowed file size exceeded. (Max. 8 MB)")
//reset file upload control
this.value = null;
}
})
});