JavaScript CSS Animate

Sicherlich gibt es einige fertige Routinen um eine Animation (slide, resize, ...)  zu erzielen, z.B. jQuery  .animate() aber manchmal reicht auch die kleine Lösung, hier nun die Variante mit CSS Transitions.

HTML

cssAnimate.htm HTML (438 bytes) 26.10.2021 22:55
<!DOCTYPE html >
<html lang="en">
  <head>
    <meta charset="utf-8" />
    <title>Simple CSS Transition Example</title>
  </head>
  <body><button id="fadeIn">fade in</button><button id="fadeOut">fade out</button><button id="moveLeft">move left</button><button id="moveRight">move right</button>
    <div id="wrapper">
      <div id="el"></div>
    </div>
    <script src="cssAnimate.js"></script>
  </body>
</html>

StyleSheet

cssAnimate.js JavaScript (1,97 kByte) 26.10.2021 22:13
// coding: utf-8
/** Created by: Udo Schmal | https://www.gocher.me/ */
(function () {
  'use strict';
  var el = document.getElementById('el'),
  wrapper = document.getElementById('wrapper');
  wrapper.style.position = 'relative';
  wrapper.style.height = '105px';
  wrapper.style.width = '100%';
  el.style.position = 'absolute';
  el.style.left = '150px';
  el.style.top = '0';
  el.style.display = 'block';
  el.style.backgroundColor = 'silver';
  el.style.border = '1px solid red';
  el.style.width = '100px';
  el.style.height = '100px';

  function getOpacity(def) {
    var result;
    var style=document.defaultView.getComputedStyle(el, null);
    if ('opacity' in style) {
      result = style.opacity;
    }
    result = parseInt(result);
    if (!isNaN(result)) result = def;
    return result;
  }

  function setOpacity(el, val) {
    el.style.opacity = val;
  }

  function cssAnimate(name, value) {
    var attr = name, to = value;
    el.style.transition = attr + " 0.5s ease";
    if (name == 'opacity') {
      setOpacity(el, to);
    } else {
      el.style.setProperty(attr, to + "px");
    }
    var transitionend = function () {
      el.style.transition = "none";
    };
    setTimeout(function(){ transitionend(); }, 500);
  }

  var fadeIn = document.getElementById('fadeIn');
  if (fadeIn) {
    fadeIn.addEventListener('click', function () {
      cssAnimate('opacity', '1');
    });
  }
  var fadeOut = document.getElementById('fadeOut');
  if (fadeOut) {
    fadeOut.addEventListener('click', function () {
      cssAnimate('opacity', '0');
    });
  }
  var moveLeft = document.getElementById('moveLeft');
  if (moveLeft) {
    moveLeft.addEventListener('click', function () {
      cssAnimate('left', '0');
    });
  }
  var moveRight = document.getElementById('moveRight');
  if (moveRight) {
    moveRight.addEventListener('click', function () {
      cssAnimate('left', wrapper.offsetWidth-100);
    });
  }
})();

Author: , published: , last modified:

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Udo Schmal

Udo Schmal
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CMS Info

Product Name:
UDOs Webserver
Version:
0.5.0.167
Description:
All in one Webserver
Copyright:
Udo Schmal
Compilation:
Sat, 25. Jun 2022 14:46:24

Development Info

Compiler:
Free Pascal FPC 3.3.1
compiled for:
OS:Linux, CPU:x86_64

System Info

OS:
Ubuntu 20.04.5 LTS (Focal Fossa)

Hardware Info

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Hewlett-Packard HP Pavilion dm4 Notebook PC
CPU Name:
Intel(R) Core(TM) i5-2430M CPU @ 2.40GHz
CPU Type:
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