Chrome extension:Cannot call method 'getElementsByTagName' of null
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Published on 2010-03-27T10:57:32Z
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2010/03/27
11:03 UTC
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Hi,i am beginner with chrome extension.There is simple problem. There is the code in my extension,but it do not work.I don't know how to figure it out. In my extension, i used a xml file to stroe some data.There is the code in my background.html,but it do not work,i don't know how to figure it out...
<!DOCTYPE html>
<html>
<head>
</head>
<body>
<script>
function loadXmlFile(){
var xmlDom = null;
var xmlhttp = new XMLHttpRequest();
if( xmlhttp ){
xmlhttp.onreadystatechange = function(){
if( xmlhttp.readyState == 4 ){
if( xmlhttp.status == 200 ){
xmlDom = xmlhttp.responseXML;
}
}
}
xmlhttp.open( "GET",chrome.extension.getURL("/xml/123.xml"),true);
xmlhttp.send( null );
}
return xmlDom;
}
var xmlDom = loadXmlFile();
var s = xmlDom.getElementsByTagName( "to" );
alert( s[0].nodeType );
</script>
</body>
</html>
I used developer tools to debug,but it says " Cannot call method 'getElementsByTagName' of null"... who can help me?
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