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Posted by Lancelot on 12/01/06 11:20
Hi,
I want to keep the scroll position after reload. I tried this:
function f_scrollTop() {
// returns scroll position
}
function scrollPosition() {
document.buy_from_shop_form.scrollpos.value = f_scrollTop();
}
<form name="buy_from_shop_form" id="buy_from_shop_form" method="post"
action="">
<input type="hidden" name="cd_price" id="cd_price" value="<?php echo
$rel[8]; ?>" />
<input type="hidden" name="cd_id" id="cd_id" value="<?php echo
$rel[0]; ?>" />
<input type="hidden" name="scrollpos" id="scrollpos" value="" />
<input type="submit" name="buy_from_shop_submit"
id="buy_from_shop_submit" value="Buy CD" onClick="scrollPosition()" />
</form>
It didn't work. When I did a print_r($_POST), the scrollpos field did not
contain anything. So I tried saving the scroll position in a cookie instead:
function scrollPosition() {
document.cookie = 'sp=' + f_scrollTop();
}
print_r($_COOKIE) revealed that the scroll position was stored in the
cookie. I removed the scrollpos hidden field from the form and added this
code to the script:
if(isset($_COOKIE['sp'])) {
echo "<script type = 'text/javascript'>\n";
echo "window.pageYOffset=".$_COOKIE['sp'];
echo "</script>";
}
When that did not work, I tried
echo "document.documentElement.scrollTop = " . $_COOKIE['sp'];
instead, and when that didn't work either, I tried
echo "document.body.scrollTop = " . $_COOKIE['sp'];
which also did not work.
I suspect the reason I cannot get this to work is that I haven't properly
understood how Php and Javascript are parsed/processed/rendered. I have
searched the Web for articles about it, but none of the articles I found
were detailed enough to give me a thorough understanding of the mechanisms.
Help would be greatly appreciated.
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