Move SVG Group On Path Trail Based On Percentage Of Whole Path Trail

I am trying to find a way to move an group (id='avatar') inside an SVG with jQuery based on an percentage of the whole trail of an path element (id='path' > path), inside the SV

Solution 1:

In order to get the position of a point on a path you need to use path.getPointAtLength.

Here is what I've done:

I've moved the avatar in a <defs> element so that I can use it latter. Also I've translated everything in the avatar in the origin of the svg canvas.
The <use> elements can get an x and a y attributes in order to be able to position the used element on the svg canvas. In Javascript I'm calculating the x and y for the avatar using the path.getPointAtLength method.

In this demo an input type range changes the position of the avatar on the path;

In your code you have a transform attribute for the avatar. I'm using this transform for the use element.

Also: for the demo I've changed the value of the viewBox attribute of your svg element. You may change it back at what you want.

let pathlength = path.getTotalLength();
let pos = path.getPointAtLength(0);


theUse.setAttributeNS(null,"x", pos.x);
theUse.setAttributeNS(null,"y", pos.y);


theRange.addEventListener("input", ()=>{
  let perc = parseInt(theRange.value);
  let leng = pathlength * perc/100;
  pos = path.getPointAtLength(leng);
  theUse.setAttributeNS(null,"x", pos.x);
  theUse.setAttributeNS(null,"y", pos.y);
})

svg{border:1px solid;overflow:visible; width:95vh; display:block; margin:1em auto;}

<input type="range" id="theRange" value="0"/>

<svg version="1.1" xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink" x="0px" y="0px"
     viewBox="230 200 400 300" xml:space="preserve">
<style type="text/css">
    .st5{fill:#43A592;stroke:#8C6239;stroke-width:0.5;stroke-miterlimit:10;}
    .st6{fill:none;stroke:#603813;stroke-width:8;stroke-linecap:square;stroke-miterlimit:10;}
    .st7{fill:none;stroke:#603813;stroke-width:8;stroke-linecap:square;stroke-miterlimit:10;stroke-dasharray:5.0414,12.0993;}
    .st8{fill:#405813;}
    .st9{fill:#7FBFD6;}
</style>
  <defs>
    <g id="avatar"  transform="translate(-276.22, -290.06)">
    <g>
        <g>
            <circle class="st9" cx="276.22" cy="290.06" r="26.83"/>
            <path class="st8" d="M276.22,317.69c-15.23,0-27.62-12.39-27.62-27.62s12.39-27.62,27.62-27.62s27.62,12.39,27.62,27.62
                S291.45,317.69,276.22,317.69z M276.22,264.04c-14.35,0-26.03,11.68-26.03,26.03s11.68,26.03,26.03,26.03
                s26.03-11.68,26.03-26.03S290.57,264.04,276.22,264.04z"/>
        </g>
        <g>
            <g>
                <path class="st16" d="M264.95,293.51c-0.35-0.11-0.74,0.03-0.93,0.35l-4.62,7.56c-0.35,0.58,0.02,1.33,0.7,1.39
                    c3.16,0.29,11.31,1.43,23.76,5.78c0.44,0.15,0.86-0.3,0.65-0.73C283.15,305.1,278.44,297.84,264.95,293.51z"/>
            </g>
            <g>
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            </g>
            <g>
                <path class="st8" d="M296.91,298.57c-0.04-0.3-0.29-0.52-0.59-0.52h-3.56c-0.33,0-0.6,0.27-0.6,0.6c0,1.34-0.33,1.94-0.6,2.2
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            </g>
        </g>
    </g>
</g>
  </defs>
<g>
    <path class="st7" id="path" d="M253.83,291.92C438.6,278.28,338.5,457,422.2,429.99c87.72-28.31-71.17-110.68,22.64-190.57
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</g>

<use id="theUse"  transform="translate(0,20)" xlink:href="#avatar" />
</svg>