javascript - Why doesn't innerHTML replacing run?
Question
<!DOCTYPE HTML>
<html>
<head>
<script>
document.write("TEST1")
document.getElementById("demo").innerHTML="TEST2"
document.write("TEST3")
</script>
</head>
<body>
<p id="demo">TO_BE_REPLACED</p>
</body>
</html>
Here is the output: TEST1
TO_BE_REPLACED
It seems the javascript executing stopped at document.getElementById("demo").innerHTML="TEST2" . Why doesn't it execute?
2 answers
solution1
3 ACCPTED 2013-02-19 02:47:29
When the script is being run, <p id="demo"> does not exist yet . Therefore, document.getElementById('demo') is returning null , which then triggers an error when you try to assign null.innerHTML = "TEST2"
This error stops all execution, so you never get to see the final TEST3 .
solution2
1 2013-02-19 02:58:13
You need to enclose your script in a function that will be called when the window loads (using "window.onload" event).
<!DOCTYPE HTML>
<html>
<head>
<script>
function replaceDemoText()
{
document.getElementById("demo").innerHTML="TEST2";
}
window.onload = replaceDemoText;
</script>
</head>
<body>
<p id="demo">TO_BE_REPLACED</p>
</body>
</html>
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