LoadingBar.js is a highly flexible, open sourced progress bar library based on SVG.
use it simply by adding a
ldBar css class to create your own progress bar.
various prebuilt styles of progress bar for you to choose, by simply adding a
You can use HTML attributes, Stylesheet or even JS API to customize it
plus no external dependency. just in vanilla JS.
You can also clone the loadingBar.js Github repository and build the files by yourself.
Create an element with
ldBar class and set its value by
By default, loadingBar.js will create a progress bar in the
set method. Alternatively, you can use construct a new
ldBar object constructor directly by passing the css selector:
new ldBar("#myItem1"); /* ldBar stored in the element */ var bar2 = document.getElementById('myItem1')
.ldBar; bar1.set(60); </script>
now you have a progress bar with default style, showing 60% as its value:
Progress bars in loadingBar.js are all responsive; you can use the css
height properties to control its size. For example, this is a huge circular progres bar with
Additionally, stroke-type progress bars are made with
path elements, so you can also control their style with common svg / css attributes:
Elements for the base grid line and the progress bar are named with class "
baseline" and "
mainline" respectively. This is quite useful when you need advanced styling. Following example makes a decent circular progress bar with shadow by tickling with "
mainline" and "
In above example, we used a built-in class
label-center to instruct ldBar to centralize the label:
However, you can do your own styling by tickling the "
ldBar-label" class. Label of ldBar is in fact a HTML <div> tag with "ldBar-labal" class, so you can style it with CSS like this:
Unit in label is by default "
%" and controlled by the
after pseudo element, so you can change it by tweaking the
after pseudo element like this:
If somehow you can't use CSS to change unit, you can also specify
data-unit attribute to customize unit; in this case the unit will be put in a
span element inside
Besides default progress bar, there are various presets in loadingBar for you to choose. To choose a preset, use the
Following are the built-in presets shipped along with loadingBar.js:
Furthermore, you can config and customize your loading bar even if you have specified data-preset attribute. We will cover this part in the folloing section.
You can adjust the appearance of progress bar by setting HTML attribute or passing the configuration into JS constructor. But at first, we should know that there are two kinds of progress bars:
Stroke Type- Progess grows along a SVG Path.
Fill Type- Progess visualized by showing part of an image or SVG Shape.
To use a stroke type progress bar, set
data-type to "
stroke" and customize your path by providing SVG Path command to the
data-path attribute. Following example draws a sinle, horizontal line:
For a more complicated example, below we draw a heart with Adobe Illustrator ( left ) and save it as SVG ( right ):
we can then use the path command ( red part ) in data-path attribute of our progress bar:
further tweaking is possible with following attributes:
|data-stroke||tweak stroke color or pattern|
|data-stroke-width||tweak stroke width|
|data-stroke-trail||tweak trail width color|
|data-stroke-trail-width||tweak trail width|
following examples show how to config with stroke and trail:
Note that alternatively you can style loading bar with CSS, as mentioned in previous section.
to use fill type progress bar, just set
data-type attribute to "
fill". loadingBar can fill either a path of an image, specified by
LoadingBar.js use the image size to initialize the progress bar, but if you need a different size, you can use
data-image-size attribute to change its size:
Direction of fill type progres bar is by default from left to right. To change this direction, use
there are 4 possible values for data-fill-dir attribute:
You can use alternative data range instead of 0 ~ 100 by data-min and data-max attributes. For example, following code generates a bar that is empty with value "59" / full with value "87":
LoadingBar.js rounds values by default, but you can use data-precision to control how values are rounded. To round to the fourth decimal places, use data-precision="0.0001":
We can also control the color and size of the base image with
data-fill-background (for color) and
data-fill-background-extrude (for size) attributes:
To make it easier to customize your progress bar, we provide generators for generating patterns including graident, stripe and bubbles. they can be used in
data-stroke. They are designed with a data-uri favor:
currently there are 3 types of pattern available:
If the above generators don't fit your need, you can use your own pattern images. To use image to fill / stroke progress bar, simply put the image URL in data-fill / data-stroke attributes. For example, this progress bar is filled with a cloud animation:
While making animated patterns is not a trivial task, Loading.io provides a rich pattern library "Loading Patterns" for you to choose; here are some sample patterns from "loading patterns":
All patterns from loading.io are seamless repeatable and animatable and can still be generated in static form. Don't forget to take a look if there is anything you need.Go to Loading Patterns
You can specify the pattern size with
data-pattern-size attribute to make pattern bigger or smaller:
Some examples of different pattern size:
All options are HTML attribute counterpart without
data- prefix. For example, following script create a red, fan type progress bar:
To update bar's value, simply use
set method will do:
Here is a complete list of all configurations for loading bars.
|data-type||set the progress type. can be |
growth direction of fill type progress bar. possible value:
|data-stroke-dir||growth direction of stroke type progress bar. possible value: |
|data-img||image of fill type progress bar. could be a file name or data URI.|
|data-path||SVG Path command, such as |
|data-fill||fill color, pattern or image when using a fill type progress bar with custom data-path. could be image, generated patterns or colors.|
|data-fill-background||fill color of the background shape in fill type progress bar.|
|data-fill-background-extrude||size of the background shape in fill type progress bar.|
|data-stroke||stroke color or pattern.|
|data-stroke-width||stroke width of the progress bar.|
|data-pattern-size||specify pattern size; e.g., |
|data-img-size||specify image size; e.g., |
|data-precision||control how values are rounded. e.g., "0.01" rounds values to second decimal place.|
|data-duration||bar animation duration.|
|data-transition-in||animate the bar for entering transition, when value is set by data-value.|
tl;dr - Support Modern Browsers and IE >= 10
LoadingBar.js is based on several nowaday web technologies supported by modern browsers except IE.
SMIL can help keep complicated animation minimized and the patterns still look ok in IE without animation, so you can consider using them even you want to support IE >= 10. otherwise, use your own GIF for IE>=10 compatibility in animated fill patterns.
This project is released under MIT License; check out our Github Repo for more information.
Any questions or suggestion? Feel free to leave comment here. :)
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