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);
    });
  }
})();

Kontakt

Udo Schmal
Udo Schmal

Udo Schmal
Softwareentwickler
Ellerndiek 26
24837 Schleswig
Schleswig-Holstein
Germany




+49 4621 9785538
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+49 4621 9785539
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CMS Info

Product Name:
UDOs Webserver
Version:
0.5.1.130
Description:
All in one Webserver
Copyright:
Udo Schmal
Compilation:
Wed, 3. Jul 2024 20:04:42

Development Info

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

System Info

OS:
Ubuntu 22.04.4 LTS (Jammy Jellyfish)

Hardware Info

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Hewlett-Packard HP Pavilion dm4 Notebook PC
CPU Name:
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CPU Type:
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