onBeforeUpdate V4 JS

Executes a function before updating the tween values, on every frames of a running animation at the specified frameRate.

Accepts

A Function whose first argument returns the animation itself

Default

noop

To change the default value globally, update the engine.defaults object.

import { engine } from 'animejs';
engine.defaults.onBeforeUpdate = self => console.log(self.id);

onBeforeUpdate code example

import { animate, utils } from 'animejs';

const [ $value ] = utils.$('.value');

let mult = 1;
let updates = 0;

const animation = animate('.circle', {
  x: '16rem',
  loopDelay: 1500,
  modifier: v => mult * v,
  loop: true,
  alternate: true,
  onBeforeUpdate: self => {
    $value.textContent = ++updates;
    // Update the mult value just before updating the tweens
    mult = 1 - self.iterationProgress;
  }
});

<div class="large row">
  <div class="circle"></div>
  <pre class="large log row">
    <span class="label">updates</span>
    <span class="value">0</span>
  </pre>
</div>

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