I am trying get use of Ajax file uploader http://valums.com/ajax-upload/ The doc says: var uploader = new qq.FileUploader({ // pass the dom node (ex. $(selector)[0] for jQuery users) element: document.getElementById('file-uploader'), // path to server-side upload script action: '/server/upload' // WHAT IS action:? }); The element property means what element ID is used as Upload button. What is action ? It must be some sort of handler for uploaded files? How I can handle uploaded files and where are located? The doc says // events // you can return false to abort submit onSubmit: function(id, fileName){}, onProgress: function(id, fileName, loaded, total){}, onComplete: function(id, fileName, responseJSON){}, onCancel: function(id, fileName){}, I want when upload complete display a list of files somewhere, say in div with ID=list The short snippet will be highly appreciated and awarded.

Need advice on Ajax fileupload

Reputation: 35597

I've used File Uploader quite a lot and I think it is the best file uploader out there.

The action is the method (URL) which receives the call from your Ajax client script. You have to define a DIV in your HTML:

<div id="uploaderFile"></div>

I've used a javascript function to build my uploader around the DIV:

function CreateImageUploader() {
    var uploader = new qq.FileUploader({
        element: $('#uploaderFile')[0],
        template: '<div class="qq-uploader">' +
                              '<div class="qq-upload-drop-area"><span>Drop files here to upload</span></div>' +
                              '<div class="qq-upload-button ui-button ui-widget ui-corner-all ui-button-text-only ui-state-default">Seleziona il Listino Excel</div>' +
                              '<ul class="qq-upload-list"></ul>' +
                              '</div>',
        hoverClass: 'ui-state-hover',
        focusClass: 'ui-state-focus',
        action: 'Home/UploadImage',
        allowedExtensions: ['jpg', 'gif'],
        params: { },
        onSubmit: function(file, ext) {

            },
        onComplete: function(id, fileName, responseJSON) {
            $("#PopupImageUploader").dialog('close');
            }
        }
    });
}

What happens here is you're creating an uploader around this element element: $('#uploaderFile')[0]. I've used the standard template but you can change the appearance. When you've done that everything is pretty much setup on the client-side. On the server side (it depends what you're using) you have to intercept and read the file and persist it.
I use ASP.NET MVC. You can find my action here and here Your server-side code will manage to persist the file where you want and will return infos to the client script.
Personally I return json data which I manage with the event onComplete to: close a dialog (like in the example); show a message etc etc etc.

If you want to pass parameters back to the client on the server side you can return a JSON object. I would do something like this:

return ("{success:true, newfilename: '" + newFileName + "'}");

I reckon that in PHP could be something like this:

echo {success:true, newfilename: '" + newFileName + "'}";

Forgive me if there are mistakes in that but I've never written a single PHP line in my whole life ;-)

the client side now can check the JSON object like this:

onComplete: function(id, fileName, responseJSON) {
   alert(responseJSON.newfilename);
}

As you can see I pass back the result of the action: success:true or success:false so I can show a warning to the user:

onComplete: function(id, fileName, responseJSON) {
if (responseJSON.success)
{
    alert(responseJSON.newfilename);
}
else {
    alert("something wrong happened");
}
}

Upvotes: 2