@brslv/scroll-progress v1.4.0
Scroll Progress · 
A tiny vanilla custom component, which renders a small progress bar on the top of a vertical scrolling page.
Zero dependencies. 👌
No node, browser only.
Usage
Import the package.
import '@brslv/scroll-progress';Then, simply use it in your DOM (just bellow the <body> tag, for example).
<body>
<scroll-progress></scroll-progress>
<!-- Other stuff... -->
</body>That's it. 👍
Configurations
color
Any valid css color prop. For example, red, #333 or #acacac.
height
Any valid css height prop: 5px, 10%, 5em.
position
top or bottom.
Example configuration:
<scroll-progress color="#333222" height="3px" position="bottom"></scroll-progress>API
element.pause()
Pause the scroll-progress updates.
const element = document.querySelector('scroll-progress');
element.pause();element.resume()
Resume the scroll-progress updates.
element.resume();element.show()
Show the scroll-progress bar.
element.show();element.hide()
Hide the scroll-progress bar.
element.hide();element.toggleHidden()
Toggle the hidden status of the scroll-progress bar.
element.toggleHidden();Events
The <scroll-element> emits the following events:
scroll-detected
Dispatches, when the scroll-progress detects a window scroll event.
Resulting event.detail object contains:
percentage- the scroll percentage, when the event occuredpaused- if the scroll-progress updates are being paused, when the event occuredhidden- if the scroll-progress bar is hidden
const element = document.querySelector('scroll-progress');
element.addEventListener('scroll-detected', ({ detail }) => {
const { percentage, paused, hidden } = detail;
});update
Dispatches, when the scroll-progress bar updates. The difference between scroll-detected and update events is that the update happens when the scroll-progress is not paused. If it's paused, then only scroll-detected is fired, but update is not.
Resulting event.detail object contains:
percentages- the scroll percentage, when the event occuredhidden- if the scroll-progress bar is hidden
const element = document.querySelector('scroll-progress');
element.addEventListener('update', ({ detail }) => {
const { percentage, hidden } = detail;
/* You don't have the paused prop here (like in the "scroll-detected" event), because updates happen only when the scroll-progress is not being paused. */
});FAQ
Can I use this with React/Angular/Vue/Whatever-modern-framework?
Yep, you can. For example, in a react application, you can simply render this as any other built-in DOM element:
<div>
<scroll-progress></scroll-progress>
{/* Other components bellow */}
<MyCustomComponent />
</div>Which browsers do you support.
This is built on top of the custom elements specification. That's why you should take into consideration the following browser support table for Custom Elements v1.
Enjoy! ⭐️
License
MIT License
Copyright (c) 2019 Borislav Grigorov
Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the "Software"), to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the following conditions:
The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software.
THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.