Disabling auto-uploading on Blueimp jQuery File Upload

Question

I am using blueint jquery.fileupload plugin to upload files using asp.net

I have a situation where I have a page to allow the user to select a category (dropdownlistbox), a title (for the uploaded file - TextBox) and a file input (handled by the plugin).

the plugin: https://github.com/i-e-b/jQueryFileUpload.Net

javascript/jquery:

 $('#fileup').fileupload({
                    replaceFileInput: false,
                    formData: function (form) {
                        return [{ name: 'dcat', value: $('#ddlCats').val() }, { name: 'title', value: $('#txtTitle').val()}];
                    },
                    dataType: 'json',
                    url: '/_handlers/FileHandler.ashx',
                    add: function (e, data) {
                        var valid = true;
                        var re = /^.+\.((doc)|(xls)|(xlsx)|(docx)|(pdf)|(pts))$/i;
                        $.each(data.files, function (index, file) {
                            if (!re.test(file.name)) {
                                $('#uploaded').html('This file type is not supported');
                                valid = false;
                            }
                        });
                        if (valid)
                            data.submit();
                    },
                    done: function (e, data) {
                        $.each(data.result, function (index, file) {
                            $('#uploaded').html(file);
                        });
                        GetFiles($('#ddlCats').val())
                    },
                    error: function () {
                        alert('An error occured while uploading the document.');
                    }
                });

html:

<div id="fUpload">
<span style="font-weight:bold;">Yeni Belge:</span><br />
    <table class="ktoeos">
        <tr>
            <td>Category:</td>
            <td> <select id="ddlCats"></select></td>
        </tr>
        <tr>
            <td>Document Description:</td>
            <td><input type="text" id="txtTitle" /></td>
        </tr>
        <tr>
            <td>Select Document:</td>
            <td><input type="file" name="file" id="fileup" /></td>
        </tr>
        <tr>
           <td colspan="2"><input type="submit" id="btnSubmit" value="Upload" /></td>
        </tr>
    </table>
    <div id="uploaded"></div>

My problem is, the file gets uploaded (through an http handler) straight after I select a file. I can handle it to submit other form data along with it however, I want to fire this event on the button submit as I need to carry out some validation. Also the user might want to select a file first and then fill the other parts of the form, which in this case he/she cannot do, due to the form being submitted before he/she can do that.

Since I am not a very good javascript programmer, I have no idea if this functionality is already available (which probably is) in the .js files available with the plugin. Any ideas what I need to change or do?

Answer 1

The add callback is invoked as soon as files are added to the widget, so you need to override it to pause the upload and then start it with a button click.

add: function (e, data) {
    $("#btnSubmit").click(function () {
        // validate file...
        if(valid)
            data.submit();
    });
}

Update: The documentation has a better example of this now: