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Vanilla javascript progress bar for browser, no css file, no dependency.
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README.md

loadbar

Light weight load bar, vanilla javascript, no css file, no dependency.

Installation

npm install loadbar --save
yarn add loadbar

Demo

Live Demo

Usage

Basic

...

var loadbar = new Loadbar();

loadbar.start();
loadbar.done();

...

Basic Example

...

var Loadbar = require('loadbar'); // commonjs
var loadbar = new Loadbar();

window.onload = loadbar.start();
setTimeout(function() { loadbar.done(); }, 1000);

...

If no argument provided, loadbar will create an element which fixed at the top of screen.

Advanced Ajax Example

var axios = require('axios');
var Loadbar = require('loadbar');

var loadbar = new Loadbar();

...
axios.get(url)
  .then(() => { loadbar.start() })
  .then(() => { loadbar.growTo(80) }) // Value should between 0 and 100.
  .then(() => { loadbar.done(); })
...

Other API

loadbar.pause(); // Bar will stop animating.
loadbar.stop(); // Bar will fade out and the bar element will be removed from parent(call loadbar.destroy())
loadbar.loading(); // start to load a little bit

Custom Configuration

var loadbar = new Loadbar(options, element);

Both two arguments are not required.

options

options.height

type: <String>

Height of the bar, limited within 4px.

Default: 2px

options.backgroundColor

type: <String>

Color of bar.

Default: #000

options.easeFunction

type: <Function>

Function of bar easing, you can use your custom function.

Default: const easing = (t, b, c, d) => c * t / d + b

NOTE: Every easing function should contains four arguments.

check here for more information of easing function

options.zIndex

type: <Number>

Config z-index of element if the bar is covered by your header or navbar.

Default: 999

options.startPoint

type: <Number>

Where bar will go when involke start() function.

Default: 30

options.pausePoint

type: <Number>

Where bar will stop waiting next event (ex: loadbar.done()),you can simply set value 100 to avoid pause behavior.

Default: 90

NOTE: You can only call done() or start() function if the bar touches the pause poinst you have set

options Example

...
var easeInQuart = function (t, b, c, d) {
  t /= d;
  return c * t* t * t * t + b;
};

var loadbar = new Loadbar({
  height: '10px', // which will be set to 4px automatically
  backgroundColor: '#e4393c',
  easeFunction: easeInQuart,
  zIndex: 1000,
  startPoint:50,
  pausePoint: 60 // bar will stop at 60%
})
...

element

You can use your own HTML element which is not fixed at the top of screen.

type: <String> or HTMLElement

element Example

var options = {<!-- your custom options -->}
var loadbar = new Loadbar(options, '.bar');

or

var options = {<!-- your custom options -->}
var bar = document.getElementById('bar')
var loadbar = new Loadbar(options, bar);

MIT License

Copyright (c) [2017] [nichenqin]

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.

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