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Posted by Erwin Moller on 12/01/06 13:15
Lancelot wrote:
> 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.
Hi,
Understanding JS and PHP interact is very simple if you follow these 3
rules:
1) Always check the HTML-source produced by PHP
2) Always check the HTML-source produced by PHP
3) Always check the HTML-source produced by PHP
From a browsers point-of-view there is little/no difference if PHP produced
the HTML, or a blue goblin did.
So try to make a plain HTML-version first that gets the job done.
THEN think about PHP automating that job.
Regards,
Erwin Moller
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