Post id in javascript

I don’t really get what you are trying to do but I will attempt to answer it.

<script>
function the_ID(){
   return "<?php the_ID(); ?>";
}
</script>

ok, thanks for your answer. The problem is I’m trying to call the id from an external javascript file. I do this wich is wrong:

document.getElementById("message_<?php the_ID(); ?>")

and I get > “document.getElementById(“message_<?php the_ID(); ?>”) has no properties” in Firebug.

what am I doing wrong?

Are you calling the JS before the content appears? Use window.onload.
Post your blog’s URL by the way.

I’m trying this:

<script type="text/javascript">
function the_ID(){
alert("<?php the_ID(); ?>");
}
</script>

And when I click on this link

<a href="#" onclick="the_ID();">CLICK</a>

I get always the value 18 no matter what post I click on.

*palmface*

You should’ve just post your URL because:
#1: You are doing it wrong.
#2: You are doing it wrong.

It should be something like this for a standard WordPress blog.

<script>
function get_post_content(id){
   return document.getElementById("post-"+id).innerHTML;
}//you should probably use textContent/innerText but I am not going to get into that here
</script>

<a href="#" onclick="alert(get_post_content(<?php the_ID(); ?>));">CLICK</a>

i love you haochi.
Thanks!!