adding svg rectangle to dom using js

Question

I would add a rectangle as on each Node element

the rect is added only in the last element.

  ngAfterViewInit() {


  let rect : NodeList = this.synoptic.nativeElement.querySelectorAll("#stops g");
  let rect2 = document.createElementNS('','rect');
  rect2.setAttribute("fill","none");
  rect.forEach((elm : Node) => {
    console.log(elm.firstChild) #### Well selecting the first element
    elm.insertBefore(rect2,elm.firstChild);
    console.log(elm) ####rect  added
  })
### rect is awailable only in the last elm
}

Edit I'm using angular And my code is running inside ngAfterViewInit() hook

Here a stackblitz demo

Answer 1

Try it this way by adding namespace and attributes required for rect

 (function() { let rect = document.querySelectorAll("#stops g"); rect.forEach(e => { let rect2 = document.createElementNS('http://www.w3.org/2000/svg', 'rect'); rect2.setAttribute("fill", "#000"); rect2.setAttribute('x', e.getAttribute('x')); rect2.setAttribute('y', e.getAttribute('y')); rect2.setAttribute('height', '50'); rect2.setAttribute('width', '50'); e.appendChild(rect2); }); })();

 <svg id="stops" xmlns="http://www.w3.org/2000/svg"> <gx="0" y="0"></g> <gx="100" y="100"></g> </svg>

Angular Working Fiddle

Answer 2

The SVG namespace is ' http://www.w3.org/2000/svg ', and not the empty string.

Additionally a rect with fill none won't be visible, it either needs a fill or a stroke and appears to have neither specified.

Finally it needs a non-zero width and height.