javascript - svg渐变填充动画百分比jquery

Question

我正在尝试使用 jquery 获取一些 svg 动画，对于每个“检查”类，我需要为渐变求和百分比偏移，并且当删除此类时需要减少百分比偏移渐变。这都需要在添加类时向下动画，在移除类时向上向下动画。

所以我得到了，渐变并将偏移量设置为 5%。试图获取数组但卡住了。考虑获取类为“check”的所有元素，并尝试对每个类求和。

 var firstStop = document.getElementById('F1gst1');
 percentage = '5%'; firstStop.setAttribute('offset',percentage);

$(".analysis-li").click(function(){

       $(this).toggleClass("check");
          if($(this).hasClass('check')){
        
          }
});

<script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/3.3.1/jquery.min.js"></script>

    <li class="analysis-li"></li>
    <li class="analysis-li"></li>
    <li class="analysis-li"></li>
    <li class="list analysis-li"></li>
    <li class="analysis-li"></li>
    <li class="list analysis-li"></li>
    <li class="analysis-li" ></li>
 
    <svg class="thermometr" id="Layer_1" xmlns="http://www.w3.org/2000/svg" viewBox="0 0 44.3 333.8">
                <linearGradient y2="0%" x2="0%" y1="100%" x1="0%" id="F1g"><stop stop-color="#00FF00" offset="0%" id="F1gst1"/><stop stop-color="#FFFFFF" offset="0%" id="F1gst2"/></linearGradient>
                <path fill="url(#F1g)" class="st0" d="M30.5 297.5V4.6c0-2.5-2.1-4.6-4.6-4.6-2.5 0-4.6 2.1-4.6 4.6v292.9c-7.9 2-13.8 9.2-13.8 17.8 0 10.2 8.2 18.4 18.4 18.4s18.4-8.2 18.4-18.4c0-8.5-5.9-15.7-13.8-17.8"/><path fill="url(#F1g)" class="st0"  d="M9 290.2h7.5v.5H9zM9 284.3h7.5v.6H9zM9 278.4h7.5v.5H9zM9 272.5h7.5v.6H9zM0 266.6h16.5v.6H0zM9 260.7h7.5v.5H9zM9 254.8h7.5v.6H9zM9 248.9h7.5v.5H9zM9 243h7.5v.6H9zM0 237.1h16.5v.6H0zM9 231.3h7.5v.5H9zM9 225.4h7.5v.6H9zM9 219.5h7.5v.6H9zM9 213.6h7.5v.6H9zM0 207.7h16.5v.6H0zM9 201.8h7.5v.6H9zM9 195.9h7.5v.6H9zM9 190h7.5v.6H9zM9 184.1h7.5v.5H9zM0 178.2h16.5v.6H0zM9 172.3h7.5v.6H9zM9 166.4h7.5v.5H9zM9 160.5h7.5v.6H9zM9 154.7h7.5v.6H9zM0 148.8h16.5v.6H0zM9 142.9h7.5v.6H9zM9 137h7.5v.5H9zM9 131.1h7.5v.5H9zM9 125.2h7.5v.6H9zM0 119.3h16.5v.5H0zM9 113.4h7.5v.6H9zM9 107.5h7.5v.6H9zM9 101.6h7.5v.5H9zM9 95.7h7.5v.6H9zM0 89.8h16.5v.6H0zM9 83.9h7.5v.6H9zM9 78.1h7.5v.6H9zM9 72.2h7.5v.6H9zM9 66.3h7.5v.6H9zM0 60.4h16.5v.6H0zM9 54.8h7.5v.6H9zM9 48.9h7.5v.6H9zM9 43h7.5v.5H9zM9 37.1h7.5v.6H9zM0 31.2h16.5v.5H0zM9 26h7.5v.6H9zM9 20.1h7.5v.5H9zM9 14.2h7.5v.6H9zM9 8.3h7.5v.6H9zM0 2.4h16.5V3H0z"/>
    </svg>

Answer 1

这就是我要做的。为了对渐变进行动画处理，我使用了 requestAnimationFrame。我在 10% 和 100% 之间设置第二个停止偏移量的动画，但您可以选择所需的值。

请阅读代码中的注释。

 // the second stop
 let laststop = document.getElementById('F1gst2');
 // a variable used to toggle the animation
 let n = 0;
 // the target value of the offset attribute
 let target;
 // the actual value of the offset attribute
 let val = 10;
 //the request animation frame id
 let rid = null;

$(".analysis-li").click(function(){
   
   n++;
   // set the target value
   if(n%2 == 1){
     target = 100; 
   }else{target = 10}
    // if there is an animation stop it  
    if(rid){cancelAnimationFrame(rid); rid="null"}
    // call the frame function
    frame()      
});


function frame(){
  rid = requestAnimationFrame(frame);
  //the distance between the value and the target value
  dist = target - val;
  //increase the value
  val += dist/10;
  // set the offset value
  laststop.setAttributeNS(null,"offset",`${val}%`)
}

svg{border:1px solid; width:30px}
path{stroke:black;}

<script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/3.3.1/jquery.min.js"></script>
<p class="analysis-li">click here</p>
<svg class="thermometr" id="Layer_1" xmlns="http://www.w3.org/2000/svg" viewBox="0 0 44.3 333.8" >
                <linearGradient y2="0%" x2="0%" y1="100%" x1="0%" id="F1g">
                  <stop stop-color="#00FF00" offset="0%" id="F1gst1"/>
                  <stop stop-color="#FFFFFF" offset="10%" id="F1gst2"/>
                </linearGradient>
                <path fill="url(#F1g)" class="st0" d="M30.5 297.5V4.6c0-2.5-2.1-4.6-4.6-4.6-2.5 0-4.6 2.1-4.6 4.6v292.9c-7.9 2-13.8 9.2-13.8 17.8 0 10.2 8.2 18.4 18.4 18.4s18.4-8.2 18.4-18.4c0-8.5-5.9-15.7-13.8-17.8"/>
  <path fill="url(#F1g)" class="st0"  d="M9 290.2h7.5v.5H9zM9 284.3h7.5v.6H9zM9 278.4h7.5v.5H9zM9 272.5h7.5v.6H9zM0 266.6h16.5v.6H0zM9 260.7h7.5v.5H9zM9 254.8h7.5v.6H9zM9 248.9h7.5v.5H9zM9 243h7.5v.6H9zM0 237.1h16.5v.6H0zM9 231.3h7.5v.5H9zM9 225.4h7.5v.6H9zM9 219.5h7.5v.6H9zM9 213.6h7.5v.6H9zM0 207.7h16.5v.6H0zM9 201.8h7.5v.6H9zM9 195.9h7.5v.6H9zM9 190h7.5v.6H9zM9 184.1h7.5v.5H9zM0 178.2h16.5v.6H0zM9 172.3h7.5v.6H9zM9 166.4h7.5v.5H9zM9 160.5h7.5v.6H9zM9 154.7h7.5v.6H9zM0 148.8h16.5v.6H0zM9 142.9h7.5v.6H9zM9 137h7.5v.5H9zM9 131.1h7.5v.5H9zM9 125.2h7.5v.6H9zM0 119.3h16.5v.5H0zM9 113.4h7.5v.6H9zM9 107.5h7.5v.6H9zM9 101.6h7.5v.5H9zM9 95.7h7.5v.6H9zM0 89.8h16.5v.6H0zM9 83.9h7.5v.6H9zM9 78.1h7.5v.6H9zM9 72.2h7.5v.6H9zM9 66.3h7.5v.6H9zM0 60.4h16.5v.6H0zM9 54.8h7.5v.6H9zM9 48.9h7.5v.6H9zM9 43h7.5v.5H9zM9 37.1h7.5v.6H9zM0 31.2h16.5v.5H0zM9 26h7.5v.6H9zM9 20.1h7.5v.5H9zM9 14.2h7.5v.6H9zM9 8.3h7.5v.6H9zM0 2.4h16.5V3H0z"/>
    </svg>