Why I cannot reach the svg objects using from html object?
Question
Example on the Internet, they can call objects in svg files easily. But i cannot reach them. Here is my html code``
<html lang="en">
<head>
<title>SVG Example</title>
<script src="mysvg.js"></script>
</head>
<body>
<div>
<button style="width: 100px; height: 50px" onclick="changeColor()">Change Color</button>
<object data="test.svg" type="image/svg+xml"></object>
</div>
</body>
</html>
This is my .js file code:
function changeColor() {
const svg = document.getElementById("layer1");
const motor1 = document.getElementById("g320");
const ellipse = document.getElementById("ellipse205");
ellipse.setAttribute("style","fill:green;stroke:green;stroke-width:2");
motor1.appendChild(svg);
ellipse.appendChild(motor1);
}
What i do wrong, why this is not working? I do not understand.
1 answers
solution1
2 2022-06-10 16:19:20
The content of a SVG <object> is part of a different DOM than the host document. Accessing it is a two-step process:
- wait for the content to load
- access its DOM with
HTMLObjectElement.contentDocument
Like this:
document.querySelector('object[data="test.svg"]').addEventListener("load", function () {
document.querySelector('button').addEventListener("click", changeColor);
}
function changeColor() {
const innerDocument = this.contentDocument;
const svg = innerDocument.getElementById("layer1");
const motor1 = innerDocument.getElementById("g320");
const ellipse = innerDocument.getElementById("ellipse205");
ellipse.setAttribute("style","fill:green;stroke:green;stroke-width:2");
motor1.appendChild(svg);
ellipse.appendChild(motor1);
}
Note that this sort of access is subject to the Same-origin Policy . It means that the host HTML file and the SVG either need to be served from the same domain, or from localhost , or a CORS header must explicitely allow it. If you load them with the file:// protocol, this.contentDocument will also return null .
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