Dynamically change text of SVG file

Question

I have external SVG file which contains the code

<g
     inkscape:groupmode="layer"
     id="layer9"
     inkscape:label="score"
     style="display:inline">
     <text
        xml:space="preserve"
        style="font-style:normal;font-weight:normal;font-size:22.5px;line-height:125%;font-family:sans-serif;letter-spacing:0px;word-spacing:0px;fill:#000000;fill-opacity:1;stroke:none;stroke-width:1px;stroke-linecap:butt;stroke-linejoin:miter;stroke-opacity:1"
        x="100.3568906"
        y="20.353357"
          id="text5833"
        sodipodi:linespacing="125%"><tspan
          sodipodi:role="line"
          id="tspan5834"
          x="300.3568906"
          y="20.353357">Score</tspan></text>

  </g>

I need to dynamically change the text Score from JS file, i already tried but not able to change the text dynamically. what i tried is:-

var list = layerNamed('score').getElementsByTagName("g");
var textNode = document.createTextNode("Score:-1");
list.appendChild(textNode);

Answer 1

You can use the following code to change the text inside existing text element.

document.getElementById('textid').textContent = "new text";

Working example below:

function changeText()
{
  document.getElementById('textid').textContent = "new text";
}

<svg height="30" width="200">
  <text id="textid" x="0" y="15" fill="red">I love SVG!</text>
  Sorry, your browser does not support inline SVG.
</svg>

<button onclick="changeText()">Click here to change text</button>

Answer 2

There are a few problems in your code.

1) layerNamed('score').getElementsByTagName("g") returns a collection of all elements with the specified tag name, as a NodeList object. The nodes can be accessed by index numbers. The index starts at 0.

So to access the first g element, you should code as shown below.

var list = layerNamed('score').getElementsByTagName("g")[0];

2) There is no need for appending a new text element for updating the text content. Just access the text and tspan and update the text content of tspan.

var textNode = list.getElementsByTagName("text")[0].children[0];
textNode.textContent = "New Text";

var list = document.getElementsByTagName("g")[0]; //document.getElementById("#layer9");
var textNode = list.getElementsByTagName("text")[0].children[0];
textNode.textContent = "New Text";

<svg height="30" width="800">
<g inkscape:groupmode="layer" id="layer9" inkscape:label="score" style="display:inline">
     <text xml:space="preserve" style="font-style:normal;font-weight:normal;font-size:22.5px;line-height:125%;font-family:sans-serif;letter-spacing:0px;word-spacing:0px;fill:#000000;fill-opacity:1;stroke:none;stroke-width:1px;stroke-linecap:butt;stroke-linejoin:miter;stroke-opacity:1" x="100.3568906" y="20.353357" id="text5833" sodipodi:linespacing="125%"><tspan sodipodi:role="line" id="tspan5834" x="300.3568906" y="20.353357">Hello</tspan></text>

  </g>
</svg>