How to refresh PHP scripted page with Javascript

Question

How can I refresh echo using javascript? I have something like this:

<?php
$today = time();  
$todayStr = date('D');
$summerS = mktime(0,0,0,2,0,date('Y'));
$summerE = mktime(0,0,0,12,21,date('Y'));
$close = mktime(17,0,0,date('n'),date('j'),date('Y'));
if ($today >= $summerS && $today <= $summerE)
{
    if ($todayStr == "Sat")
    {
        $open = mktime(8,0,0,date('n'),date('j'),date('Y'));
        if ($today >= $open && $today <= $close)
        {          
            $openT = "Otevřeno";
        }
        else
        {
            $nextO = date("H:i:s",($open - $today));
            $openT = "Zavřeno";
        }
    }
    elseif ($todayStr == "Sun")
    {
        $open = mktime(8,0,0,date('n'),date('j'),date('Y'));
        if ($today >= $open && $today <= $close)
        {          
            $openT = "otevřeno";
        }
        else
        {
            $nextO = date("H:i:s",($open - $today));
            $openT = "zavřeno";
        }
    }...

<p>Právě je <?php echo $openT ?></p>

And I don't even know how to refresh that echo in < p > to showing time by second.

It would be a better approach to just use Javascript for this. Would this be okay for you aswell ? — marpme
– marpme, Commented May 16, 2017 at 17:23
you can use innerhtml method w3schools.com/jsref/prop_html_innerhtml.asp — Agam Banga
– Agam Banga, Commented May 16, 2017 at 17:24
Do you have much else on this page? Are you ok with using JavaScript to fully reload the page each second? Or better yet, would you consider rewriting your logic in JavaScript? That would definitely perform better, since it would save the round trip time to the server and back each second, and everything you've shown here in PHP could be done in JavaScript. — alexanderbird
– alexanderbird, Commented May 16, 2017 at 17:38
Yeah.. I'll do my best in rewriting. This is just it nothing else. So rewrite it won't be problem. Thanks. — Marise no Yami
– Marise no Yami, Commented May 16, 2017 at 19:58

James Ross · Accepted Answer · 2017-05-16 17:39:46Z

3

You can't "refresh" echo with javascript as the echo code executes on the server and the javascript executes in the browser.

Your two best options are:

Do all the calculations you do in your PHP in client side Javascript
Create a webservice that returns your $openT value and call that endpoint with AJAX in the browser

answered May 16, 2017 at 17:39

James Ross

7985 silver badges15 bronze badges

Sign up to request clarification or add additional context in comments.

Collectives™ on Stack Overflow

How to refresh PHP scripted page with Javascript

1 Answer 1

Comments

Your Answer

Hot Network Questions

Collectives™ on Stack Overflow

1 Answer 1

Comments

Your Answer

Sign up or log in

Post as a guest

Related