使用HTML内的JavaScript动态创建SVG元素

I want to create a rectangle inside an HTML page, then write some text on that rectangle. I also need that text to be a hyperlink. This is what I did but it is not working:

我想在HTML页面内创建一个矩形，然后在该矩形上写一些文本。我还需要该文本作为超链接。这是我做的，但它不起作用：

    <!DOCTYPE html>
<html>
<body>

<script>

    var svg   = document.documentElement;
    var svgNS = svg.namespaceURI;

    var rect = document.createElementNS(svgNS,'rect');
    rect.setAttribute('x',5);
    rect.setAttribute('y',5);
    rect.setAttribute('width',500);
    rect.setAttribute('height',500);
    rect.setAttribute('fill','#95B3D7');
    svg.appendChild(rect);
    document.body.appendChild(svg);

    var h=document.createElement('a');
    var t=document.createTextNode('Hello World');
    h.appendChild(t);
    document.body.appendChild(h);


</script>

</body>
</html>

Can you help please? Thanks.

你能帮帮忙吗？谢谢。

3 个解决方案

#1

Change

更改

var svg   = document.documentElement;

至

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

so that you create a SVG element.

这样您就可以创建一个SVG元素。

For the link to be an hyperlink, simply add a href attribute :

要使链接成为超链接，只需添加href属性：

h.setAttribute('href', 'http://www.google.com');

Demonstration

示范

#2

Add this to html:

将其添加到html：

<svg id="mySVG" xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink"/>

Try this function and adapt for you program:

试试这个功能并适应你的程序：

var svgNS = "http://www.w3.org/2000/svg";  

function createCircle()
{
    var myCircle = document.createElementNS(svgNS,"circle"); //to create a circle. for rectangle use "rectangle"
    myCircle.setAttributeNS(null,"id","mycircle");
    myCircle.setAttributeNS(null,"cx",100);
    myCircle.setAttributeNS(null,"cy",100);
    myCircle.setAttributeNS(null,"r",50);
    myCircle.setAttributeNS(null,"fill","black");
    myCircle.setAttributeNS(null,"stroke","none");

    document.getElementById("mySVG").appendChild(myCircle);
}

#3

To facilitate svg editing you can use an intermediate function:

为了方便svg编辑，您可以使用中间函数：

function getNode(n, v) {
  n = document.createElementNS("http://www.w3.org/2000/svg", n);
  for (var p in v)
    n.setAttributeNS(null, p, v[p]);
  return n
}

Now you can write:

现在你可以写：

svg.appendChild( getNode('rect', { width:200, height:20, fill:'#ff0000' }) );

Example (with an improved getNode function allowing camelcase for property with dash, eg strokeWidth > stroke-width):

示例（使用改进的getNode函数，允许camelcase用于带破折号的属性，例如strokeWidth> stroke-width）：

function getNode(n, v) {
  n = document.createElementNS("http://www.w3.org/2000/svg", n);
  for (var p in v)
    n.setAttributeNS(null, p.replace(/[A-Z]/g, function(m, p, o, s) { return "-" + m.toLowerCase(); }), v[p]);
  return n
}

var svg = getNode("svg");
document.body.appendChild(svg);

var r = getNode('rect', { x: 10, y: 10, width: 100, height: 20, fill:'#ff00ff' });
svg.appendChild(r);

var r = getNode('rect', { x: 20, y: 40, width: 100, height: 40, rx: 8, ry: 8, fill: 'pink', stroke:'purple', strokeWidth:7 });
svg.appendChild(r);

#1