blueImp/jquery file upload - How do I get the error message if the file type was not accepted?

Question

I want to use the BlueImp/Jquery File Upload to be able to upload some images to web webserver. I have this JS code which I generated by reading many sources

 $('#file_upload').fileupload('option', {
        dataType: 'json',
        url: '/Upload/UploadFiles',
        maxFileSize: 5000000,
        acceptFileTypes: /(\.|\/)(gif|jpe?g|png)$/i,
        process: [
            {
                action: 'load',
                fileTypes: /^image\/(gif|jpeg|png)$/,
                maxFileSize: 20000000 // 20MB
            },
            {
                action: 'resize',
                maxWidth: 1440,
                maxHeight: 900
            },
            {
                action: 'save'
            }
        ],
        progressall: function (e, data) {
            $(this).find('.progressbar').progressbar({ value: parseInt(data.loaded / data.total * 100, 10) });
        },
        done: function (e, data) {
            $('#show_image').append('<img src="' + data.result[0].ThumbURL + '" />');
            $('#imgID').val($('#imgID').val() + data.result[0].Id + ',');
            $(this).find('.progressbar').progressbar({ value: 100 });
        },
        error: function (e, data) {
            var a = 1;
        }
    });
});

It works because it doesn't upload any file which is not an image, but I would like to be able to get the error messages (in case it exists) to show to the user.

In their demo they have some code (jquery.fileupload-ui.js and jquery.fileupload-fp.js) that create "magically" the HTML with the error inside (I am still strugling to understand it).

I don't really get if I should use these plugins too and somehow customize the HTML being generated or if it is simpler to get the info manually and populate it.

I am pretty new to JS and Jquery, so maybe I am missing something.

How do I configure the HTML being generated or how do I get the error message?

Thanks, Oscar

Answer 1

For this you can use file added callback to validate files, like this, use "return false" to avoid adding that file;

 $('#yourfileuploader').fileupload({
                    add: function (e, data) {
                        var fileType = data.files[0].name.split('.').pop(), allowdtypes = 'jpeg,jpg,png,gif';
                        if (allowdtypes.indexOf(fileType) < 0) {
                            alert('Invalid file type, aborted');
                            return false;
                        }

                    }
                });

or you can register fileuploadadded callback like this,

$('#yourfileuploader').fileupload().bind('fileuploadadded', function (e, data) {
                    var fileType = data.files[0].name.split('.').pop(), allowdtypes = 'jpeg,jpg,png,gif';
                    if (allowdtypes.indexOf(fileType) < 0) {
                        alert('Invalid file type, aborted');
                        return false;
                    }
                });

also you can access fileupload acceptFileTypes options using; e.originalEvent.data.fileupload.options.acceptFileTypes

You can find more information here;

https://github.com/blueimp/jQuery-File-Upload/wiki/Options