Appending path child within SVG Using Javascript

There are two issues:

1. As already pointed out, you have to use the full namespace uri, so in this case:

   newpath = document.createElementNS('http://www.w3.org/2000/svg',"path");  
   

2. Attributes also need to be set with namespace in mind. The good news is that you can pass in null as the namespace uri, so:

   newpath.setAttributeNS(null, "d", "M 1,97.857143 C 19.285714,96.428571 24.016862,131.64801 90.714286,132.85714 140.78762,133.7649 202.79376,66.16041 202.79376,66.16041");
   

Also, here are two ways to make dealing with the svg namespace easier (assuming that it is a standalone svg, not embedded in HTML):

• To refer to the svg element, instead of giving it an ID, you can use document.rootElement.
• document.rootElement.getAttribute(null, "xmlns") returns an empty string (while requesting other attributes does work using this method. Instead, use document.rootElement.namespaceURI.

So in your code, you could make the following rewrites:

From:

 newpath = document.createElementNS("http://www.w3.org/2000/svg","path");

To:

 newpath = document.createElementNS(document.rootElement.namespaceURI,"path");  

And to append the element, you can go from:

document.getElementById("fullPageID").appendChild(newpath);

to:

document.rootElement.appendChild(newpath);

So the final script would be:

newpath = document.createElementNS(document.rootElement.namespaceURI,"path");  
newpath.setAttributeNS(null, "id", "pathIdD");  
newpath.setAttributeNS(null, "d", "M 1,97.857143 C 19.285714,96.428571 24.016862,131.64801 90.714286,132.85714 140.78762,133.7649 202.79376,66.16041 202.79376,66.16041");  
newpath.setAttributeNS(null, "stroke", "black"); 
newpath.setAttributeNS(null, "stroke-width", 3);  
newpath.setAttributeNS(null, "opacity", 1);  
newpath.setAttributeNS(null, "fill", "none");

document.rootElement.appendChild(newpath);