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Adding elements to a SVG in Polymer element

Asked By: Anonymous

Below you see a small test element. It creates a SVG and whenever you click the SVG it should add a circle. Inspecting the element shows that the circles are indeed added (I know the position isn’t exactly correct), but they are not shown.

This is svg-test.html

<link rel="import" href="../polymer/polymer.html">

<dom-module name="svg-test">
  <link rel="import" type="css" href="svg-test.css">
    <svg id="test" width$="{{width}}" height$="{{height}}" xmlns=""></svg>
      is: 'svg-test',

      properties: {
      width: {
        type: String,
        value: "200"
      height: {
        type: String,
        value: "200"

    listeners: {
      'test.tap': 'addCircle'

    addCircle: function(e) {
      var uri = '';
      var svg = this.$$('svg');
      var circle = document.createElementNS(uri,'circle');
      circle.setAttributeNS(uri, 'r', '5');
      circle.setAttributeNS(uri, 'cx', e.detail.x);
      circle.setAttributeNS(uri, 'cy', e.detail.y);
      circle.setAttributeNS(uri, 'fill', 'white');
      circle.setAttributeNS(uri, 'stroke', 'black');
      circle.setAttributeNS(uri, 'stroke-width', '2');

This is a test page:

<!DOCTYPE html>

  <title>svg-test Demo</title>

  <a href="http://../webcomponentsjs/webcomponents-lite.min.js">http://../webcomponentsjs/webcomponents-lite.min.js</a>

  <link rel="import" href="svg-test.html">

<body unresolved>
  <p>An example of svg-test looks like this:</p>


And this is bower.json:

  "name": "svg-test",
  "dependencies": {
    "polymer": "Polymer/polymer#^1.1.2"


Answered By: Anonymous

Although SVG elements are in the SVG namespace, attributes are typically in the null namespace so you want this…

  var circle = document.createElementNS(uri,'circle');
  circle.setAttribute('r', '5');
  circle.setAttribute('cx', e.detail.x);
  circle.setAttribute('cy', e.detail.y);
  circle.setAttribute('fill', 'white');
  circle.setAttribute('stroke', 'black');
  circle.setAttribute('stroke-width', '2');

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