Get point's y coordinate on svg path

Question

I guess I need to add some explanation, that I want to ask this question, because too short question doesn\'t quality standards... funny...

So, here is the question: How

Answer 1

I was working on a similar problem and Paul's answer really helped me.

Just to further illustrate @Paul LeBeau's answer, here is a little demo:

let path = document.getElementById("path");
let svg = document.getElementById("svg");

// The first important function getTotalLength
let totalLength = path.getTotalLength();
let intersections = 27;

for(var i = 0; i <= intersections; i ++){
  let distance = i * 1/intersections * totalLength;
  
  // The second important function getPointAtLength
  let point = path.getPointAtLength(distance);
  addCircleToSVG(point.x, point.y);
  addTextToSVG(point.x, point.y);
}

function addCircleToSVG(x, y){
  let circle = document.createElementNS("http://www.w3.org/2000/svg",'circle');
  circle.setAttribute("cx", x);
  circle.setAttribute("cy", y);
  circle.setAttribute("r", "5");
  circle.setAttribute("fill", "#8888ff");
  svg.appendChild(circle);
}

function addTextToSVG(x, y){
  let text = document.createElementNS("http://www.w3.org/2000/svg",'text');
  text.setAttribute("x", x + 10);
  text.setAttribute("y", y);
  text.setAttribute("fill", "orange");
  text.innerHTML = Math.round(y);
  svg.appendChild(text);
}

svg{
  width:auto;
  height: auto;
}