JavaScript in XML?

[Mad_Griffith]

Hello,

would you explain to me why this JS test in an XML file doesn’t work?

<?xml version="1.0" ?>
<!-- <?xml-stylesheet type="text/css" href="main.css" ?> -->

<root xmlns="http://www.w3.org/1999/xhtml">

    <a:musicstore xmlns:a="http://www.w3.org/TR/html4/">
        <a:album>
            <a:name>Scenes from a Memory</a:name>
            <a:artist>Dream Theater</a:artist>
            <a:year>1999</a:year>
        </a:album>
    </a:musicstore>

    <b:musicstore xmlns:b="http://www.w3.org/TR/html4/">
        <b:album>
            <b:name>Protocosmos</b:name>
            <b:artist>Allan Holdsworth</b:artist>
            <b:year>2001</b:year>
        </b:album>
    </b:musicstore>

<script type="text/javascript">
<![CDATA[
document.getElementsbyTagName("year").innerHTML = "2000";
]]>
</script>

</root>

It is returning me this:

TypeError: undefined is not a function (evaluating 'document.getElementsbyTagName("year")')

Thank you!

[felgall]

See https://developer.mozilla.org/en-US/docs/Web/API/document.getElementsByTagNameNS for the call to use to get the tag in XML.

Also innerHTML will not work when you don’t have HTML.