Develop Reference

Use PHP in a Shortcode to pull content from specific post ID

I am trying to create a shortcode that references content from a specific post ID. I have the code referenced below. It's set up so that if someone clicks the button, it will reveal content from the popup-id that will be defined in the shortcode. The popup-id is linked to a specific page/post.
function subscribe_link_att($atts, $content = null) {
$default = array(
'link' => '#',
'popup-id' => '4582'
);
$a = shortcode_atts($default, $atts);
$content = do_shortcode($content);
return '<button class="popup_button"> <span class="text">'.$content.'</span></button>
<div id="'.($a['popup-id']).'" style="display: none" class="hide">
<div class="social-popup-inner">
<img id="social-popup-close" src="/wp-content/themes/huh/_static/images/close-button.svg" alt="close">
<?php
$popup = get_post('.($a['popup-id']).');
echo $popup->post_content;
?>
</div>
</div>
';
}
add_shortcode('subscribe', 'subscribe_link_att');
The issue is that when I click the button, the content isn't pulling through (it just saying post_content; ?>).
It looks like the PHP code is being commented out (screenshot hyperlinked here)
I would love any feedback or direction.
I have a sample page here that I am playing with . It's formatted poorly but it's just for me to test things out in. The button called "TEXT HERE" is the button I am working on.
https://heyuhuman.com/melissa-test/
THANK YOU SO MUCH

How to display text saved in DB, properly in HTML?

I am creating an application using PHP and MySQL.
In the DB, the data is saved in the following manner:
But, while displaying the result in HTML page, the result comes like this:
The issue might be because HTML needs tags like "<br/>", etc......
How can I display the result in actual format?
Here's the code section displaying the data:
<div class="com-text">
<?php echo $row['chatDesc'];?>
</div>
EDIT:
Also, I need to display the data by creating a div using jquery(dynamically). So how to display it in javascript format too?
html += '<div class="com-text">'+data.chat[i].chatDesc+'</div>';
$("#chat_list").append(html);

Use the below simple CSS
.com-text{
white-space: pre-wrap;
word-wrap: break-word;
}

You should use nl2br which inserts line breaks where newlines occur in a string
the javascript equivement of this function + your code:
function nl2br (str, is_xhtml) {
var breakTag = (is_xhtml || typeof is_xhtml === 'undefined') ? '<br />' :
'<br>';
return (str + '').replace(/([^>\r\n]?)(\r\n|\n\r|\r|\n)/g, '$1'+ breakTag +'$2');
}
html += '<div class="com-text">'+nl2br(data.chat[i].chatDesc, true)+'</div>';
$("#chat_list").append(html);

You can try this.
<div class="com-text">
<pre> <?php echo $row['chatDesc'];?> </pre>
</div>

$orig = "I'll \"walk\" the dog now";
$a = htmlentities($orig);
$b = html_entity_decode($a);

You should use nl2br which inserts line breaks where newlines occur in a string
<div class="com-text">
<?php echo nl2br($row['chatDesc']);?>
</div>

Just use the nl2br() function to format it:
<?php
$mychat = nl2br($row['chatDesc']);
?>
Here is how you can do..
<div class="com-text">
<?php echo $mychat; ?>
</div>

use nl2br();
<div class="com-text">
<?php echo nl2br($row['chatDesc']) ;?>
</div>

javascript function with 2 arguments is not working

DEscription :
I have a php script that displays the div on an html page
echo '<div class = "star_box" id = "'.$each_status['post_id'].'" onmousedown = "star_it(this.id)"></div>';
Now when I click on this div the star_it function gets called and it works perfect...
The problem
I want to pass another argument in the star it function .. like this
echo '<div class = "star_box" id = "'.$each_status['post_id'].'" onmousedown = "star_it(this.id,'.$each_status['regno'].')"></div>';
or a simple alphabet if any like star_it(this.id,s)
but when I do so the function stops working as when I click the div the function does not gets called ....
I dont know why I am stuck and now my star rating system does not work... I have absolutely no idea what is wrong
Anyone ??

You should modify your string quote's like this :
<?php
$status = "second test";
echo '<div class="star_box" id="'.$id.'" onmousedown="star_it(this.id,'."'".$status."'".');" >Hello</div>';
?>
<script>
function star_it(foo1,foo2){
console.log(foo1);
console.log(foo2);
}
</script>
This example works for me.
So with your code :
<?php
echo '<div class="star_box" id="'.$id.'" onmousedown="star_it(this.id,'."'".$each_status['regno']."'".');" >Hello</div>';
?>

Here you go
echo '<div class = "star_box" id = "'.$each_status['post_id'].'" onmousedown = "star_it(this.id,\''.$each_status['regno'].'\')"></div>';
you forget to add \' before and after your string , the JS engine on the browser will treat your string as an undefined variable and the function will not work because of that .
//my English is not so good.

Try
echo '<div class = "star_box" id = "'.$each_status['post_id'].'" onmousedown = "star_it(this.id,\"'.$each_status['regno'].'\")"></div>';

Undefined variable from php to js

I've got a loop posting images from database.
I tried to give each photo div separate id.
When i tried to send it to script by onclick function
It shows that "$photoid is not defined "
I tried to print this variable in this first php script but it shows me all IDs, so shouldnt be empty or undefined...
$allphotos = mysql_query("SELECT * FROM photos ORDER BY id DESC");
while ($numphotos = mysql_fetch_assoc($allphotos)){
$photoinfo = mysql_query('SELECT * FROM photos WHERE link="'.$numphotos['link'].'" ');
$fetchinfo = mysql_fetch_assoc($photoinfo);
$photoid = $fetchinfo['id'];
echo '<div class="thisphotobox" id="'.$photoid.'"><img src="'.$numphotos['link'].'" alt="photo" class="photolink" onclick=clicked($photoid)></div>';
}
Here goes script:
<script>
function clicked(photoid){
document.getElementById('photoid').style.backgroundColor = 'red'
}
</script>

Change this:
echo '<div class="thisphotobox" id="'.$photoid.'"><img src="'.$numphotos['link'].'" alt="photo" class="photolink" onclick=clicked($photoid)></div>';
to this:
echo '<div class="thisphotobox" id="'.$photoid.'"><img src="'.$numphotos['link'].'" alt="photo" class="photolink" onclick="clicked('.$photoid.');"></div>';
otherwise, the output is just clicked($photoid), all text.
Also change that:
function clicked(photoid){
document.getElementById('photoid').style.backgroundColor = 'red'
}
to that:
function clicked(photoid){
document.getElementById( photoid.toString() ).style.backgroundColor = 'red';
}

The answer above is working, but they forgot to add something,
instead of
echo '<div class="thisphotobox" id="'.$photoid.'"><img src="'.$numphotos['link'].'" alt="photo" class="photolink" onclick="clicked('.$photoid.');"></div>';
copy this code
echo '<div class="thisphotobox" id="'.$photoid.'"><img src="'.$numphotos['link'].'" alt="photo" class="photolink" style="background-color:white" onclick="clicked('.$photoid.');"></div>';
add the style="background-color:white;" i think you can't access the .style in js if you didn't initialize it in your div. hope this will help

This is simply an escaping issue. The argument $photoid in your echoed function has to be escaped if it is a string. In your code above this:
onclick=clicked($photoid)
should be
onclick="clicked($photoid)"
if $photoid is a number or
onclick="clicked(\'$photoid\')"
if it is alphanumeric or a string

Reduce string length retrieved from database

I am fetching rows with title & its description from MySQL database.
I want to alter the strings that I got from the database.
<div class="title"><?php $row['title']?></div>
<div class="details"><?php $row['desc']?></div>
So please tell me, how to apply javascript to this content ($row['..'])? Means, how I can access those strings in Javascript?
If the string length is more than 50 characters, I want to limit the string & add dots (...) to it.

It is better to use mb_substr() than substr()
<?php
echo mb_substr($row['title'],0,50);
Source

You can do this using substr.
<?php echo (strlen($row['desc']) > 50) ? substr ($row['desc'] , 0, 50 ).'...' : $row['desc']; ?>

Why do that? Html has a css for that. you can fix the width and add the "text-overflow:ellipsis".
Try this:
<div class="fixedWidth title"><?php $row['title']?></div>
<div class="fixedWidth details"><?php $row['desc']?></div>
<style>
.fixedWidth{
width:200px;
white-space: nowrap;
overflow: hidden;
text-overflow:ellipsis;
}
</style>

If you are working with non-ASCII strings and you want to manipulate those then substr() is wrong to use. Instead you should use multibyte string functions, like mb_substr() and others.
For that you must have mbstring-extension enabled for PHP. see http://php.net/manual/en/mbstring.installation.php
I would also not directly echo string for using javascript - you never know what chars could be there and then you should start to escape some chars to work properly with javascript.
Instead I would encourage you to use json_encode. This will escape properly all special and UTF8-chars.
PECL's json-extension must be enabled for json_* functions. See http://php.net/manual/en/json.installation.php
Of course if you are using Zend-framework, then proper would be use Zend_Json::encode()
<?php
$maxLength = 50;
$encoding = 'UTF-8';
$tail = ' ...';
$row['desc'] = (mb_strlen($row['desc'], $encoding) > $maxLength) ? mb_substr($row['desc'], 0, $maxLength, $encoding) . $tail : $row['desc'];
?>
<script type="text/javascript">
var rowData = <?php echo json_encode($row); ?>;
alert(rowData.desc);
</script>

why don't you try in directly php scripting insted of javascript.
you can make it as below.
<div class="title"><?php echo $title = strlen($row['title']) > 50 ? substr($row['title'], 0, 50)."..." : $row['title']; ?></div>
Then you can get the title in javascript as well.
$(document).ready(function(){
var title = $(".title").text();
});