On Mar 10, 2011, at 9:00 AM, Keith wrote:
I am new to prototype JS library feature.
I want to implement ajax upload feature in my web application. For
that,
1) I wrote a servlet which copies the file to a particular folder in
server.
2) HTML form, I have a upload control and a Button which fires an ajax
request. Below is the code on the button
new Ajax.Request('http://isgdev.synygy.net/servlet/
CommonsFileUploadServlet',
{
method: "post",
onSuccess: function(transport){
var response = transport.responseText || "no response text";
alert("Check-----! \n\n" + response);
},
onFailure: function(){ alert('Something went wrong...') }
});
When I click the button, the servlet is called but the selected file
is not copied to server.
But, When I submit the form, through regular post method (without
using ajax). The servlet works properly and the file is copied to
server properly.
Can you please guide me on this.
Sure. With the exception of bleeding-edge browsers (WebKit nightlies,
mostly), JavaScript is prevented from sending files over
XMLHTTPRequest for security reasons. Most "Ajax" file uploads fake
their way around this by using hidden iframe elements as the actual
form target, and a callback from within that iframe to the parent page
to handle the response from the server.
Walter
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