How to make jQuery/Javascript work in PHP statement?

Question

I'm having some difficulties getting Javascript to execute in a PHP statement if it is possible at all. Below I have the code, if the field 'First' is empty, then the background color of a certain div will be yellow. How can I get this to work properly if it is possible in the first place? Thanks in advance.

if (empty($_POST["First"])) {

    echo '<script type="text/javascript">';
    echo '$("div").css({"background-color":"yellow"});';
    echo '</script>';

}

Is there a reason you're not doing this check in javascript instead of PHP? — Loko
– Loko, Commented Apr 4, 2017 at 11:27
No particular reason, I was just wondering if it is possible and if so, how to achieve it. — Lord Goderick
– Lord Goderick, Commented Apr 4, 2017 at 11:28
Consider adding a class to the div in PHP, and then having that class in CSS to set the background colour. — Reinstate Monica Cellio
– Reinstate Monica Cellio, Commented Apr 4, 2017 at 11:29
Also, something that it is going to really help you is to use like that <?php if (empty($_POST["First"])) { ?> <script type="text/javascript"> $("div").css({"background-color":"yellow"}); </script> <?php } ?> — Antonios Tsimourtos
– Antonios Tsimourtos, Commented Apr 4, 2017 at 11:29
What is the difficulty? It looks correct assuming you have loaded jQuery before the statement. Any console errors? — mplungjan
– mplungjan, Commented Apr 4, 2017 at 11:30

Shafiqul Islam · Accepted Answer · 2017-04-04 11:47:35Z

1

check this code. hope it will help you

<div>Content Div</div>
<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
<?php
 //$_POST["First"] = ''; if you want to check this code execute then remove comment then run this code
 if (empty($_POST["First"])) {
echo '<script type="text/javascript">';
echo '$("div").css("background-color","yellow");';
echo '</script>';
}
?>

you can also use this code

<div>Content Div</div>
<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
<?php
//$_POST["First"] = ''; this is for test case if you want to check then remove comment then run this code
 if (empty($_POST["First"])) { ?>
<script type="text/javascript">
$("div").css("background-color","yellow");
</script>
<?php } ?>

in this code php tag and javascript tag use separate

edited Apr 4, 2017 at 11:47

answered Apr 4, 2017 at 11:38

Shafiqul Islam

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Comments

Community · Accepted Answer · 2017-05-23 12:25:48Z

0

You should try putting script tags inside php tags, like this:

<?php 
    if (empty($_POST["First"])) { ?>
        <script type="text/javascript">
        '$("div").css({"background-color":"yellow"});';
        </script>
<?php } ?>

Here is an example: https://stackoverflow.com/a/13254287/7808973

edited May 23, 2017 at 12:25

CommunityBot

11 silver badge

answered Apr 4, 2017 at 11:48

Pedro Vivaldi

113 bronze badges

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