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electron-progressbar

electron-progressbar provides an easy-to-use and highly customizable API, to show and manipulate progress bars on Electron applications.

With electron-progressbar, you can easily customize the appearance of the progress bars, including the visual aspects using CSS, as well as the text and any other visible information. Additionally, the library allows for customization of the Electron BrowserWindow that contains the progress bars.

Demo

Indeterminate progress bar:

Determinate progress bar:


In addition to displaying progress bars within the window, electron-progressbar also enables progress bars to be displayed in the taskbar using the BrowserWindow's setProgressBar method. This feature allows the user to view progress information without needing to switch to the window itself.

example of the taskbar for an indeterminate progress bar:

example of the taskbar for a determinate progress bar:

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Table of Contents

• Installation
• Examples
  • Indeterminate progress bar
  • Determinate progress bar
  • Progress bar with custom HTML structure (Experimental)
  • More examples
• API
  • Methods
    • .new ProgressBar(options, [electronApp])
    • .getOptions() ⇒ object
    • .on(eventName, listener) ⇒ reference to this
      • Events
        • ready
        • progress
        • completed
        • aborted
    • .setCompleted()
    • .close()
    • .isInProgress() ⇒ boolean
    • .isCompleted() ⇒ boolean
  • Properties
    • value ⇒ number
    • text ⇒ string
    • detail ⇒ string
• Changelog
• License

Installation

Install with npm:

$ npm i electron-progressbar

Examples

Indeterminate progress bar

Example of an indeterminate progress bar - this progress bar is useful when your application cannot calculate how long the task will take to complete:

const {app} = require('electron');
const ProgressBar = require('electron-progressbar');

app.on('ready', function() {
  var progressBar = new ProgressBar({
    text: 'Preparing data...',
    detail: 'Wait...'
  });
  
  progressBar
    .on('completed', function() {
      console.info(`completed...`);
      progressBar.detail = 'Task completed. Exiting...';
    })
    .on('aborted', function() {
      console.info(`aborted...`);
    });
  
  // launch a task...
  // launchTask();
  
  // when task is completed, set the progress bar to completed
  // ps: setTimeout is used here just to simulate an interval between
  // the start and the end of a task
  setTimeout(function() {
    progressBar.setCompleted();
  }, 3000);
});

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Determinate progress bar

Example of a determinate progress bar - this progress bar is useful when your application can accurately calculate how long the task will take to complete:

const {app} = require('electron');
const ProgressBar = require('electron-progressbar');

app.on('ready', function() {
  var progressBar = new ProgressBar({
    indeterminate: false,
    text: 'Preparing data...',
    detail: 'Wait...'
  });
  
  progressBar
    .on('completed', function() {
      console.info(`completed...`);
      progressBar.detail = 'Task completed. Exiting...';
    })
    .on('aborted', function(value) {
      console.info(`aborted... ${value}`);
    })
    .on('progress', function(value) {
      progressBar.detail = `Value ${value} out of ${progressBar.getOptions().maxValue}...`;
    });
  
  // launch a task and increase the value of the progress bar for each step completed of a big task;
  // the progress bar is set to completed when it reaches its maxValue (default maxValue: 100);
  // ps: setInterval is used here just to simulate the progress of a task
  setInterval(function() {
    if(!progressBar.isCompleted()){
      progressBar.value += 1;
    }
  }, 20);
});

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Progress bar with custom HTML structure (Experimental)

In most scenarios, it's recommended to use the available properties under options to customize the progress bar, ensuring smooth functionality without delving into complex logic. However, if your requirements include a progress bar with unique elements or a distinct HTML structure, the customHTML option gives you full control over the rendering and behavior of the progress bar's elements. Please note that customHTML is an experimental feature.

An example demonstrating the use of the customHTML option can be found here, and a demo can be viewed below:

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More examples are available in folder examples.

API

Methods

new ProgressBar(options, [electronApp])

Create a new progress bar. It's necessary to wait for the ready event to be emitted by Electron's BrowserWindow, since the progress bar is displayed within it. Optionally, you can pass the electron app as a second parameter (parameter electronApp) when creating the progress bar. Check the sample code on this page for detailed examples on how to set properties to options.

You can define most of the characteristics of the progress bar using the options parameter. Below is a list of properties that you can set for the options parameter.

Option name	Type	Default value	Description
debug	boolean	false	Specifies whether debugging should be enabled. If set to true, the browser's DevTools panel will automatically open when the progress bar is created. This can be helpful when debugging and/or dealing with issues.
abortOnError	boolean	false	Specifies whether the progress bar should automatically abort and close if an error occurs internally.
indeterminate	boolean	true	Specifies whether the progress bar should be indeterminate. If set to false, the progress bar will be determinate.
initialValue	number	0	The initial value for the progress bar. This parameter is only applicable for determinate progress bars.
maxValue	number	100	The maximum value for the progress bar. When the progress bar's value reaches this number, the progress bar will be considered complete and the complete event will be fired. This parameter is only applicable for determinate progress bars.
closeOnComplete	boolean	true	Specifies whether the progress bar window should be automatically closed after the progress bar completes. If set to false, the progress bar will remain visible until the close method is called by your application.
lang	string	empty	Specifies the value for the lang attribute of the BrowserWindow's <html> tag. This option has no default value, and the lang attribute is only added to <html> when lang is explicitly set. This option can also be helpful in case of font rendering issues.
title	string	"Wait..."	Specifies the text shown on the progress bar window's title bar.
text	string	"Wait..."	Specifies the text shown inside the progress bar window, next to the progress bar.
detail	string	empty	Specifies the text shown between text and the progress bar element. It can be used to display detailed information, such as the current progress of a task. When used for this purpose, it is usually more useful to set this property later so that your application can calculate and display, in real time, the current progress of the task.
style	object		Specifices the visual styles for the text, detail, bar, and value elements. All properties and values are pure CSS format, in the exact same way they would be used in a CSS file. Check the options for style below.
style.text	object		An object containing CSS properties for styling the text element.
style.detail	object		An object containing CSS properties for styling the detail element.
style.bar	object	{"width":"100%", "background-color":"#BBE0F1"}	An object containing CSS properties for styling the bar element of the progress bar.
style.value	object	{"background-color":"#0976A9"}	An object containing CSS properties for styling the value element in the progress bar.
customHTML	string	empty	This experimental option enables you to build the progress bar using custom HTML code. You can provide the full HTML code, starting with the <html> tag, to this option. For more information, see the section Progress bar with custom HTML structure (Experimental).
remoteWindow	instance of BrowserWindow	null	Specifies the BrowserWindow where the progress bar will be displayed. If null/undefined/empty or not specified, a new BrowserWindow will be created to show the progress bar.
browserWindow	object		Specifies the options for Electron's BrowserWindow. Check the options for browserWindow below. P.S.: although only a few options are set by default, you can specify any of Electron's BrowserWindow options.
browserWindow.parent	instance of BrowserWindow	null	A BrowserWindow instance to be used as the parent of the progress bar's window. If specified, the progress bar window will always be on top of the given parent window and will block user interaction in parent window until the progress bar is completed (or aborted) and closed.
browserWindow.modal	boolean	true	Specifies whether the progress bar's window is a modal window. Note that this property only works when the progress bar's window is a child window, i.e., when browserWindow.parent is specified.
browserWindow.resizable	boolean	false	Specifies whether the user can resize the progress bar's window.
browserWindow.closable	boolean	false	Specifies whether the user can close the progress bar's window.
browserWindow.minimizable	boolean	false	Specifies whether the user can minimize the progress bar's window.
browserWindow.maximizable	boolean	false	Specifies whether the user can maximize the progress bar's window.
browserWindow.width	number	450	Specifies the width of the progress bar's window in pixels. Only numeric values are accepted, for example: 600.
browserWindow.height	number	175	Specifies the height of the progress bar's window in pixels. Only numeric values are accepted, for example: 600.
browserWindow .webPreferences.nodeIntegration	boolean	true	Specifies whether node integration is enabled.
browserWindow .webPreferences.contextIsolation	boolean	false	Specifies whether contextIsolation is enabled.

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getOptions() ⇒ object

Return a copy of all the current options.

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on(eventName, listener) ⇒ reference to this

Add the listener function to the end of the listeners array for the event named eventName, and then return a reference to this so that next calls can be chained.
P.S.: there are no checks to verify if listener has already been added. If you call the same combination of eventName and listener multiple times, the listener will be added and executed multiple times as well.

Events

Event name	Receives parameter	Description
ready	none	This event is fired when the progress bar has been created and is ready to be used and manipulated.
progress	value	This event is available only for determinate progress bars. It is fired every time the progress bar's value is changed. The listener receives, as its first parameter, the current value of the progress bar.
completed	value	This event is fired when the progress bar is completed, i.e., its value reaches maxValue or the complete method is called. The listener receives, as its first parameter, the current value of the progress bar.
aborted	value	This event is fired if the progress bar is closed before it's completed, i.e., when user closes the progress bar window or the close method is called before the progress bar reaches completion. The listener receives, as its first parameter, the current value of the progress bar.

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setCompleted()

Set the progress bar as complete, indicating that the task has finished.

If progress bar is indeterminate, a manual call to this method is required since it's the only way to trigger the completed event and indicate that the task has finished. Otherwise, the progress bar will continue to be displayed indefinitely.

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close()

Close the progress bar window. If progress bar has not been completed yet, it will be aborted, and the aborted event will be fired.

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isInProgress() ⇒ boolean

Return true if the progress bar is currently in progress, meaning that it has not been completed or aborted yet; otherwise it will return false;

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isCompleted() ⇒ boolean

Return true if the progress bar is completed, otherwise false.

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Properties

value ⇒ number

This property allows getting or setting the progress bar's current value. It is only applicable and available for determinate progress bars.

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text ⇒ string

This property allows getting or setting the progress bar's text information that is shown above the progress bar element.

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detail ⇒ string

This property allows getting or setting the progress bar's detail information that is shown between text and the progress bar element. Useful to display detailed information, such as the current status, in real time, or the current progress of the task.

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Changelog

Changelog

License

MIT. See LICENSE.md for details.