Adding variable in js

[V]

I'm not sure how to add a variable to a js and pass it to another page. It's just a script for loading more comments like twitter.

 

this code

 

data: "lastmsg="+ ID,

 

passes a div id to ajax_more.php.. but how would I insert a variable like this into the js?

 

$post_id = $_GET['post'];

 

It's meant to grab the post id from the url to display its comments and I need to pass that id to the ajax_more.php file

 

The entire js is

 

$(function() {
//More Button
$('.more').live("click",function() 
{
var ID = $(this).attr("id");
if(ID)
{
$("#more"+ID).html('<img src="images/ajax-loader.gif" />');
$.ajax({
type: "POST",
url: "ajax_more.php",
data: "lastmsg="+ ID,
cache: false,
success: function(html){
$("ol#update").append(html);
$("#more"+ID).remove();
}
});
}
else
{
$(".morebox").html('The End');
}
return false;
});
});

 

and ajax_more.php

 

if(isset($_POST['lastmsg']))
{

$post_id = $_POST['post'];
$lastmsg= $_POST['lastmsg'];
$lastmsg = $connection->real_escape_string(strip_tags($_POST["lastmsg"]));

$sql = "SELECT * FROM comments WHERE post_id='$post_id' AND com_id<'$lastmsg' ORDER BY com_id DESC LIMIT 9";
$result = $connection->query($sql) or die(mysqli_error($connection));

while ($row = $result->fetch_assoc()) {

$com_id=$row['com_id'];
$com_dis=$row['com_dis'];
.....and so on

 

I get the error

 

Undefined index: post in ...

[V]

Darn, I clicked quote again instead modify.. sorry

[xcandiottix]

Since javascript is client side and php is serverside, i would guess that you would need to use php to write the js. So, maybe:

 

<script>

var post=document.write("<?php echo $_GET['post']?>");

</script>

 

Not great with js.. sorry if it's way off.

[V]

xcandi, that's pretty cool. I'm not getting any js errors but it's returning the post id on a blank page.  :-\

 

I used it in here like this

 

data: 'lastmsg='+ ID + '&post='+ document.write("<?php echo $_GET['post']?>"),

[xcandiottix]

Change:

 

url: "ajax_more.php",

 

to url: "ajax_more.php?",

 

?

 

I don't know if it's doing that already. If that's not the issue then try:

 

data: 'lastmsg='+ ID + '&post=<?php echo $_GET['post']?>,

[V]

Thanks I tried both but I get the same results. Maybe it might work if I can figure out how to store the post id in a div like the other..

[KevinM1]

Your problem is that you're confusing GET with POST.  Looking at jQuery's ajax documentation, it's clear that the 'data' attribute is only supposed to be used with a GET request.  This makes sense, as it appends the 'data' to the end of the destination script's URL as part of a query string.  POST is done behind the scenes - no URL is used to pass data along.  In short, you can't use 'data' with a POST because POST doesn't work the way you think it does.

 

You'll need to rethink your design.

[V]

Aah darn.. Thanks for letting me know Nightslyr. I should be able to figure it out based on that.