Backdrop Spinner Component

by on October 13, 2022

Backdrop Spinner UI Component

Spinners are a common way to illustrate to your users that a page or component is currently loading. Sometimes, however, you want to show something behind the spinner other than just a white canvas. That’s where the Backdrop Spinner component comes in.

The Backdrop Spinner component, available free in Backendless Marketplace, lets you customize the backdrop behind the spinner.

You can use a single solid color, or you can add an image to display while the content loads.

Backdrop spinner component in action

You can also change the opacity of the background, allowing you to show the underlying elements beneath the spinner while still obscuring them with a given color.

Backdrop spinner component in action with transparent background

Read the full documentation here.

How to Install the Backdrop Spinner Component

Installing custom components from Backendless Marketplace is super easy. First, in UI Builder, select the Components tab.

Go to Components in UI Builder

There, you will see a button labeled Install Component. This will take you to the library of components available in the Marketplace.

Install UI Component in UI Builder

When you click Install Component, you will open a list of available UI Components to install.

Install a UI Component from Marketplace

Select the component you want and click Install.

When you return to the User Interface tab, you will see a new section added to your toolkit on the right-hand side called Custom Components.

Backdrop Spinner Component added to UI Builder Canvas

You can then simply drag the component onto your canvas just like any other UI Component.

How the Backdrop Spinner Component Works

When added to your app, the Backdrop Spinner component can be immediately implemented in your application.

The two default options available out of the box are whether or not to display the backdrop and the type of loader to be displayed. You can also choose not to display the component entirely, just like any other UI Builder component.

To adjust the color and opacity of the backdrop, you will need to create an Extension and specify your preferred color and opacity in the @bl-customComponent-backdrop-background class. You can use RGBA, HEX, or HSL to define your color.

Custom Backdrop Spinner background color light blue with transparency HSL

Available Options and What They Mean

Once you have placed your component, when you select it, you will see all of the available options (properties) for the component in the toolkit area. These are the default settings for the component that you can easily adjust.

Each of the available properties are described in the table below. For more information, such as Theme styles and event handlers, visit the Backdrop Spinner GitHub repo.

Property Type Default value Logic Data Binding UI Setting Description
backdropVisibility Checkbox false Backdrop Visibility Logic YES YES Controls the visibility of a component.
loaderType Select
[bar,doted circle,doted horizon,doted line circle,doted square,line circle,radar]
“bar” Loader Type Logic NO YES Controls the loader type of a component.


When you click on the Logic icon or tab for the component, you will see the modifiable event handlers, just as you would with a standard component. However, the main logic for the component – the logic that makes it work – is hidden to protect it from accidentally being broken.

Additionally, in the Logic area, you will also find all available data binding properties.

That’s it! Ready to try it for yourself?

The Backdrop Spinner component is one of many custom components available now in Backendless Marketplace, completely free!

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Hi. Could you please give me your source code ?

Hi Trong Anh, if you post this on our support forum, our team will be able to help you.

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