I have a file up-loader. I do not want to check the size of the file on server side, I need some kind of listener to get the size uploaded each period and check if it is allowed or not using Javascript and I am using an asp.net file uploader.
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3 Answers
AFAIK there is no javascript event to check client-side for a filesize when uploading... and since you don't want to check this server-side the answer is browser-dependent in the sense that it needs a client-side javascript API capable of what you want.
You could use HTML5+Javascript (File API) for this... but beware: there are borwsers/browser versions that don't supoport this... see details and samples:
2 Comments
Eslam Soliman
I want to use it with asp.net all i need is the event and i need to know how to cancel uploading using asp.net or javascript
Yahia
@EslamSoliman AFAIK there is no javascript event to check for a filesize when uploading... what you ask is browser-dependent in the sense that it needs a javascript API capable of what you want - that is exactly what the links above provide!
i think you cannot fetch the file size detail from javascript, what you can do, you can access it from server side with the help of script block . like this.
protected void btnFileUpload1_Click(object sender, EventArgs e)
{
int filesize;
filesize = FileUpload1.PostedFile.ContentLength; //to get the Size of uploaded files
if(filesize > yourMaxLength)
{
string errorScript = "<script type=\"text/javascript\">" +
"alert('Invalid File, you cannot upload file exceeding ' + filesize );" +
"</script>";
ClientScript.RegisterClientScriptBlock(this.GetType(), "alert", errorScript);
}
else
{
//proceeed with upolad successful operation
}
}
Comments
Uploadify is a nice plugin for jQuery for uploading files, it has a pretty nice collection of callbacks on events, with full info about the file that is being uploaded and the progress of the upload.
1 Comment
Eslam Soliman
it's using flash as it know the size before uploading it from the server side