How to create an attribute in SVG using JavaScript?
I have a script in my application that hides g elements in an SVG that have specific ID values, but this only works if the g element has a visibility attribute. However, the SVGs I'm using do not have a visibility attribute on the g elements and I'm not in control of the source. Therefore, I need to find a way to dynymically add the visibility attribute when the parent HTML page is loaded.
I would like the script to create the visibility attribute on all g elements that are children of <g id="Callouts">. For instance, the final code would look something like this:
<g id="Callouts">
<g id="Callout1" visibility="visible">...</g>
<g id="Callout2" visibility="visible">...</g>
</g>
I've looked all over for examples where attributes are added to the SVG structure, but haven't been able to find anything yet. It also doesn't help that I'm a complete novice when it comes to JavaScript. Does anyone know how to do this?
UPDATE: I coupled Digital Plane's suggested code with the code I'm using to access the SVG document. The resulting function is below. This is supposed to show every g element under <g id="Callouts">. However, I keep getting an "object not supported" error on the for loop.
function displayOnload (svgName) {
var svgEmbed = document.embeds[svgName];
if (typeof svgEmbed.getSVGDocument != 'undefined') {
var svgDocument = svgEmbed.getSVGDocument();
var parentElement = svgDocument.getElemen开发者_如何学JAVAtById('Callouts');
if (parentElement != null) {
var childElements = parentElement.getElementsByTagname('g');
for (var i=0; i < childElements.length; i++) {
childElements[i].setAttribute('visibility', 'visible');
}
}
}
}
Please forgive my ignorance about JavaScript, but what am I doing wrong here?
UPDATE: Here is an example of my HTML code.
<?xml version="1.0" encoding="UTF-8"?>
<html xmlns="http://www.w3.org/1999/xhtml" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:svg="http://www.w3.org/2000/svg">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8" />
<title>Drop Bar assembly (2328775)</title>
<link rel="stylesheet" type="text/css" href="Content.css" />
<meta http-equiv="content-type" content="text/html;charset=utf-8"/>
<script type="text/javascript">
function displayOnload (svgName) {
var svgEmbed = document.embeds[svgName];
if (typeof svgEmbed.getSVGDocument != 'undefined') {
var svgDocument = svgEmbed.getSVGDocument();
var parentElement = svgDocument.getElementById('Callouts');
var childElements = parentElement.getElementsByTagName('g');
for (var i=0; i < childElements.length; i++) {
childElements[i].setAttribute('visibility', 'hidden');
}
}
}
</script>
</head>
<body onload="displayOnload('SVG')">
...
</body>
</html>
You should be able to use setAttribute, with something like this:
element.setAttribute("visibility", "visible");
If you want all g elements that are children of <g id="Callouts">, do this on document load:
var element = document.getElementById("Callouts");
var elements = element.getElementsByTagName("g");
for(var i = 0; i < elements.length; i++)
elements[i].setAttribute("visibility", "visible");
No, you must use setAttributeNS(null, 'visibility', 'visible);
setAttribute might not work on/in svg on some browsers.
Or to be more blunt: setAttribute is DOM1 setAttributeNS is DOM2 Svg has name spaces, svg is xml so setAttributeNS is for you.
加载中,请稍侯......
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