Question

所以我是JS的超级新人。我试图让滚动动画仅在指定区域内工作，而不是我的＆＃34;位置：固定＆＃34;标记使它出现在我的网站顶部，并一直滚动它，而不是动画开始，只在其定义的框架中工作。

我有什么想法可以解决这个问题？

这就是它的样子（它是钢铁侠头盔，原谅未完工的网站）：http://frontlinecreative.co/test-page/

以下是与我合作的代码：

＆＃13;

$(document).ready(function() {
  //variable for the 'stroke-dashoffset' unit
  var $dashOffset = $(".path").css("stroke-dashoffset");
  //on a scroll event - execute function
  $(window).scroll(function() {
    //calculate how far down the page the user is 
    var $percentageComplete = (($(window).scrollTop() / ($("html").height() - $(window).height())) * 100);
    //convert dashoffset pixel value to interger
    var $newUnit = parseInt($dashOffset, 10);
    //get the value to be subtracted from the 'stroke-dashoffset'
    var $offsetUnit = $percentageComplete * ($newUnit / 100);
    //set the new value of the dashoffset to create the drawing effect
    $(".path").css("stroke-dashoffset", $newUnit - $offsetUnit);
  });
});

＆＃13;

svg {
  position: fixed;
  margin: auto;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  width: 50%;
  max-width: 580px;
  max-height: 440px;
  display: block;
}

.path {
  stroke-dashoffset: 2000;
  stroke-dasharray: 2000;
}

.frame {
  height: 3000px;
  width: 100%;
  display: block;
}

＆＃13;

<div class="frame"></div>

<svg viewBox="-2 -2 236 342" version="1.1">

  <g stroke="#fff" stroke-width="2" fill="none">

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    <ellipse class="path" cx="220.310078" cy="157.2" rx="11.6899225" ry="44.4"></ellipse>

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    <ellipse class="path" transform="translate(192.733850, 263.100000) rotate(14.000000) translate(-192.733850, -263.100000) " cx="192.73385" cy="263.1" rx="2.69767442" ry="5.1"></ellipse>

    <path class="path" d="M174.026355,12.6174134 L169.487865,17.2932552 C166.718666,20.1462603 162.779378,25.2030573 160.689513,28.5874508 L157.323962,34.037732 L165.99062,38.6966084 C169.494422,40.5801238 174.835467,44.1301036 177.932696,46.6358384 L183.991501,51.5375611 L183.847056,57.9405908 C183.757357,61.9168514 183.206733,68.3328583 182.619024,72.2589855 L179.849992,90.7572128 L177.544308,106.765455 C176.977025,110.704073 175.900421,117.053408 175.135484,120.96839 L171.762371,138.232152 L180.930381,153.944907 L188.527514,111.891792 C189.235297,107.973933 190.773363,101.716226 191.956657,97.9347013 L193.54097,92.8716128 C194.72705,89.0811835 196.930253,83.0317212 198.458885,79.3671372 L213.050991,44.385537"></path>

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    <path class="path" d="M10.5768439,58.0315472 L29.4327053,42.7882975 L36.781002,29.1745233"></path>

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  </g>
  
</svg>

＆＃13;

说我被卡住会是轻描淡写。

谢谢！

Answer 1

SVG内容不在“frame”div中。将结束</div>标记从第一行代码移到最后一行。

Answer 2

我认为这个问题的答案Using jQuery to keep scrolling object within visible window会帮助你。基本上，取消css中的固定位置，然后在用户滚动得足够远之后，使用滚动事件处理程序内部的jQuery将位置设置为固定。此外，在此之前不要开始绘制动画。

我希望有所帮助！

基于滚动的动画在定义区域之外工作

2 个答案: