Can't access DOM element
Question
I wrote a web application with a body onload event. I know this isn't optimal so I want to use DOMContentLoaded to trigger my init event.
I have a strange problem, I can't access my DOM element and I don't know why :/.
HTML:
<!DOCTYPE html>
<html>
<head>
<title>Test</title>
<script type="text/javascript" src="main.js"></script>
</head>
<body>
<div id="test">Hello World</div>
</body>
</html>
JS:
// add event listener
document.addEventListener('DOMContentLoaded', init, false);
function init () {
// pop up
alert(document.getElementById(test).innerHTML);
}
Does somebody see the problem?
3 answers
solution1
3 2013-03-03 14:22:20
You are passing the undefined variable test to the getElementById() function, instead of the string value 'test' .
So
document.getElementById(test); // Incorrect - as an undefined varible
Should in fact be
document.getElementById('test') // Correct - as a string value
Or
var element_id = 'test';
document.getElementById(element_id) // Correct - as a defined variable
solution2
2 ACCPTED 2013-03-03 14:22:28
Add double quotes around test ie "test"
document.addEventListener('DOMContentLoaded', init, false);
function init () {
// pop up
alert(document.getElementById("test").innerHTML);
}
solution3
2 2013-03-03 14:26:55
If your init function is executed, then you might add quote arroud your id :
document.getElementById(test)
becomes
document.getElementById('test')
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