Skip to main content

jQuery file upload with Bootstrap progress bar

Performing an asynchronous file upload from the browser is a common problem with almost as many solutions as there are developers. The following solution is the best fit for my needs, and also works well with most popular browsers. Backwards compatibility is not an issue in this case which is great, because I can use the new technologies as they are supposed to be used.

Everything is put together in JSFiddle for a working example. I will continue to explain the parts below...

First, the input field needs to be styled as a button. The form tag is only present for us to be able to reset the file input field later on.

<form>
    <span class="fileUpload btn btn-default">
        <span class="glyphicon glyphicon-upload"></span> Upload file
        <input type="file" id="uploadFile" />
    </span>
</form>

.fileUpload {
    position: relative;
    overflow: hidden;
}
.fileUpload input {
    position: absolute;
    top: 0;
    right: 0;
    margin: 0;
    padding: 0;
    cursor: pointer;
    opacity: 0;
}

The Javascript is contained within one method which is executed when the file input is changed.

$("#uploadFile").change(function() {
    var formData = new FormData();
    formData.append('file', this.files[0]);
   
    $("#files").append($("#fileUploadProgressTemplate").tmpl());
    $("#fileUploadError").addClass("hide");
   
    $.ajax({
        url: '/url/json/',
        type: 'POST',
        xhr: function() {
            var xhr = $.ajaxSettings.xhr();
            if (xhr.upload) {
                xhr.upload.addEventListener('progress', function(evt) {
                    var percent = (evt.loaded / evt.total) * 100;
                    $("#files").find(".progress-bar").width(percent + "%");
                }, false);
            }
            return xhr;
        },
        success: function(data) {
            $("#files").children().last().remove();
            $("#files").append($("#fileUploadItemTemplate").tmpl(data));
            $("#uploadFile").closest("form").trigger("reset");
        },
        error: function() {
            $("#fileUploadError").removeClass("hide").text("An error occured!");
            $("#files").children().last().remove();
            $("#uploadFile").closest("form").trigger("reset");
        },
        data: formData,
        cache: false,
        contentType: false,
        processData: false
    }, 'json');
});

When selecting a file for upload, a new AJAX request is performed. I use the FormData object to pass on the file to the backend as multipart/form-data. By attaching an event handler to the progress event I can set the width of the progress bar to the calculated percentage.

The error and success methods are simple handlers that hide the progress bar and either adds the file to the list on success or displays an error message on error.

In this particular case I am using jQuery templating, but since that project is abandoned I would recommend chosing another template engine...
Labels:

Comments

Post a Comment

Popular posts from this blog

Binding a HTML-formatted string to a WPF WebBrowser control

Sometimes there is a need to display a HTML formatted string in a WPF application. There are a couple of ways to do this, but the most stright forward is to use a WebBrowser control and the NavigateToString method. This approach has one big flaw, you cannot use binding to a string out of the box, but I found a great solution through Stack Overflow which adds a bindable property to the  WebBrowser  control using  NavigateToString . The following class is all that is needed to add that behavior. A new depencency property named Html is introduced to the  WebBrowser  and the proper change action is performed in the OnHtmlChanged method. public class BrowserBehavior { public static readonly DependencyProperty HtmlProperty = DependencyProperty.RegisterAttached( "Html", typeof(string), typeof(BrowserBehavior), new FrameworkPropertyMetadata(OnHtmlChanged)); [AttachedPropertyBrowsableForType(typeof(WebBrowser))] public static string GetHtml(WebBrowser bro
1 comment
Read more

Binding Enum with DescriptionAttribute in WPF

Binding an enumeration to a ComboBox can be done in several ways. In most cases you don't want to display the value itself, but a more user friendly description. One common approach is to use the DescriptionAttribute on the Enum values to supply a description for each value.  This is all possible in a very MVVM friendly way. First step is to add the  DescriptionAttribute  to the values of the enumeration. public enum MyValues { [Description("First value")] First, [Description("Second value")] Second } To retrieve the description from the enum we use a simple extension method. This method returns the value of the DescriptionAttribute if it exists, otherwise the string representation of the enum value is returned. public static string GetDescription(this Enum value) { var fieldInfo = value.GetType().GetField(value.ToString()); var attribute = fieldInfo.GetCustomAttributes(typeof(DescriptionAttribute), false).FirstOrDefault() as
2 comments
Read more

Bindable RichTextBox with HTML conversion in WPF

In WPF , the RichTextBox  control is not really like other controls. Due to its flexible nature, there is no built in way of binding a property to the content. In this case, I wanted a simple  RichTextBox  control with a binding to an HTML formatted string to be able to use the built-in formatting features of the  RichTextBox  and allow users to create simple HTML formatted content. First, doing the conversion on-the-fly proved to have major performance issues, so I ended up binding the content to a XAML string. The XAML to HTML conversion can be performed at any time. I created a UserControl with a bindable Text-property. The view contains a  RichTextBox  control. <RichTextBox x:Name="richTextBox" TextChanged="OnRichTextBoxChanged"> The source code for the user control contains the Text property and the methods to handle the binding. public static readonly DependencyProperty TextProperty = DependencyProperty.Register( "Text", typeof(st
Post a Comment
Read more