如何在javascript代码中实现html元素？

Question

I am trying to design a sample web page, and I'm facing some issues with svg....

I have created an svg circle with a line over it which will rotate with in the circle. Here is the sample code.

<?xml version="1.0" encoding="iso-8859-1"?>

<svg width="100%" height="100%">
<circle cx="200" cy="200" r="100" stroke="black" stroke-width="4" fill="black" />
<g transform="translate(200,200)">
<line x1="0" y1="0" x2="100" y2="0" style="stroke:rgb(255,255,255);stroke-width:2">
<animateTransform attributeName="transform"
                        attributeType="XML"
                        type="rotate"
                        from="25" to="360" dur="100s"/>
</line>
</svg>

In the sample code above the 'line' will start rotating immediately when the page is launched, but I want the line to be rotated after I press the START button, something like this...

<input type="button" value=" START " onclick="start()" class="control-menu-top-btn" id="green-btn">

<script language="javascript" type="text/javascript">
function start()
{
  .. ?
}
</script>

Answer 1

The beginElement method will start an animation. Setting the begin attribute to indefinite in the markup will stop it from running before the javascript starts it.

 html, body { width: 100%; height: 100%; } 

 <input type="button" value=" START " onclick="start()" class="control-menu-top-btn" id="green-btn"> <script> function start() { document.getElementById("transform").beginElement(); } </script> <svg width="100%" height="100%"> <circle cx="200" cy="200" r="100" stroke="black" stroke-width="4" fill="black" /> <g transform="translate(200,200)"> <line x1="0" y1="0" x2="100" y2="0" style="stroke:rgb(255,255,255);stroke-width:2"> <animateTransform id="transform" attributeName="transform" attributeType="XML" type="rotate" from="25" to="360" dur="100s" begin="indefinite" /> </line> </g> </svg>