2018-02-19 23:17:11 +00:00
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# Progress Bar in Taskbar (Windows, macOS, Unity)
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2020-10-23 06:03:04 +00:00
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## Overview
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2018-02-19 23:17:11 +00:00
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2020-10-23 06:03:04 +00:00
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A progress bar enables a window to provide progress information to the user
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without the need of switching to the window itself.
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2018-02-19 23:17:11 +00:00
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2020-10-23 06:03:04 +00:00
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On Windows, you can use a taskbar button to display a progress bar.
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2018-02-19 23:17:11 +00:00
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2020-10-23 06:03:04 +00:00
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![Windows Progress Bar][windows-progress-bar]
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2018-02-19 23:17:11 +00:00
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2020-10-23 06:03:04 +00:00
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On macOS, the progress bar will be displayed as a part of the dock icon.
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2018-02-19 23:17:11 +00:00
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2020-10-23 06:03:04 +00:00
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![macOS Progress Bar][macos-progress-bar]
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2018-02-19 23:17:11 +00:00
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2020-10-23 06:03:04 +00:00
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On Linux, the Unity graphical interface also has a similar feature that allows
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you to specify the progress bar in the launcher.
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![Linux Progress Bar][linux-progress-bar]
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> NOTE: on Windows, each window can have its own progress bar, whereas on macOS
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and Linux (Unity) there can be only one progress bar for the application.
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----
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All three cases are covered by the same API - the
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[`setProgressBar()`][setprogressbar] method available on an instance of
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`BrowserWindow`. To indicate your progress, call this method with a number
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between `0` and `1`. For example, if you have a long-running task that is
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currently at 63% towards completion, you would call it as
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`setProgressBar(0.63)`.
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Setting the parameter to negative values (e.g. `-1`) will remove the progress
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bar, whereas setting it to values greater than `1` (e.g. `2`) will switch the
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progress bar to indeterminate mode (Windows-only -- it will clamp to 100%
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otherwise). In this mode, a progress bar remains active but does not show an
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actual percentage. Use this mode for situations when you do not know how long
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an operation will take to complete.
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2018-02-19 23:17:11 +00:00
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See the [API documentation for more options and modes][setprogressbar].
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2020-10-23 06:03:04 +00:00
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## Example
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Starting with a working application from the
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[Quick Start Guide](quick-start.md), add the following lines to the
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`main.js` file:
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2018-02-19 23:17:11 +00:00
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```javascript
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const { BrowserWindow } = require('electron')
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2018-02-19 23:28:24 +00:00
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const win = new BrowserWindow()
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2018-02-19 23:17:11 +00:00
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win.setProgressBar(0.5)
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```
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2020-10-23 06:03:04 +00:00
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After launching the Electron application, you should see the bar in
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the dock (macOS) or taskbar (Windows, Unity), indicating the progress
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percentage you just defined.
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For macOS, the progress bar will also be indicated for your application
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when using [Mission Control](https://support.apple.com/en-us/HT204100):
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[windows-progress-bar]: https://cloud.githubusercontent.com/assets/639601/5081682/16691fda-6f0e-11e4-9676-49b6418f1264.png
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[macos-progress-bar]: ../images/macos-progress-bar.png
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[linux-progress-bar]: ../images/linux-progress-bar.png
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2020-10-20 01:46:27 +00:00
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[setprogressbar]: ../api/browser-window.md#winsetprogressbarprogress-options
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