CODEWITHSUNDEEP
javascriptjqueryprogress-bar
Vonder
Vonder

Reputation: 4059

How to increment the progress in javascript progress bar?

I am trying to add a simple javascript progress bar to my website, I found a few scripts, but I always encounter the same problem - I am able to intialize the loader and set it to increment to a given value, but cannot do it in steps. Here is a simple example - https://jsfiddle.net/kimmobrunfeldt/k5v2d0rr/

At the end there is:

bar.animate(1.0);

How can i have it animated in steps? Lets say first to 50% then (after 2 secs) to 75% and then 100%. I've tried

bar.animate(0.5);
bar.animate(0.75);
bar.animate(1);

as well as:

setTimeout(function(){bar.animate(0.5)}, 2000);
setTimeout(function(){bar.animate(0.75)}, 2000);
setTimeout(function(){bar.animate(1)}, 2000);

but it always chooses the last (highest) value, instead of being animated in steps. Any advice appreicated.

Upvotes: 0

Views: 1280

Answers (2)

Brian
Brian

Reputation: 1893

bar.animate(0.5);
bar.animate(0.75);
bar.animate(1);

The above code runs simultaneously, and the last one overrides the others.

setTimeout(function(){bar.animate(0.5); console.log("animate")}, 2000);
    console.log('timeout 1 called');
 setTimeout(function(){bar.animate(0.75); console.log("animate")}, 2000);
    console.log('timeout 2 called');
setTimeout(function(){bar.animate(1); console.log("animate")}, 2000);
    console.log('timeout 3 called');

Soon as the first timeout is set, it doesn't wait for the delay before setting the next. Check the logs on the console to see what happens.

The problem is that those scripts run simultaneously. Do something like this (or something better):

bar.animate(0.5);  // Number from 0.0 to 1.0
setTimeout(function () {
    bar.animate(0.75);
}, 2000);

setTimeout(function () {
    bar.animate(1.0);
}, 4000);

If you wanted to just animate the bar in sequences for the sake of it, you can do keyframes with CSS too.

Upvotes: 1

Mike Cluck
Mike Cluck

Reputation: 32521

The problem is that you're, essentially, queuing up all of your steps to happen simultaneously. Instead, you want to pass a callback to the animate function so when it finishes, you can tell it to move to the next step.

// [email protected] version is used
// Docs: http://progressbarjs.readthedocs.org/en/1.0.0/

var bar = new ProgressBar.Line(container, {
  strokeWidth: 4,
  easing: 'easeInOut',
  duration: 1400,
  color: '#FFEA82',
  trailColor: '#eee',
  trailWidth: 1,
  svgStyle: {
    width: '100%',
    height: '100%'
  },
  text: {
    style: {
      // Text color.
      // Default: same as stroke color (options.color)
      color: '#999',
      position: 'absolute',
      right: '0',
      top: '30px',
      padding: 0,
      margin: 0,
      transform: null
    },
    autoStyleContainer: false
  },
  from: {
    color: '#FFEA82'
  },
  to: {
    color: '#ED6A5A'
  },
  step: (state, bar) => {
    bar.setText(Math.round(bar.value() * 100) + ' %');
  }
});

// Keep track of the current value
var value = 0;
setTimeout(function increment() {
  value += 0.1;
  bar.animate(value, function() {
    // Animation has completed, queue up another step
    if (value < 1) {
      setTimeout(increment, 500);
    }
  });
}, 1000);
#container {
  margin: 20px;
  width: 400px;
  height: 8px;
  position: relative;
}
<script src="https://rawgit.com/kimmobrunfeldt/progressbar.js/1.0.0/dist/progressbar.js"></script>
<div id="container"></div>

Upvotes: 1

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