Develop Reference

Javascript not working inside a PHP function

I'm new to javascript.
There seems to be no result but a blank screen when I try the following code:
function send_to_class($data)
{
echo 'PPPPPPPPPPPPPPPPPPPPPPPPPPPPPPPPPPPPPPPPPPPP';
?>
<script type="text/javascript">
$(".username").append(<?php echo $data;?>);
</script>
<?php
echo 'EEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEE';
}
and my PHP
$data = "You might think I'm Bonkers, but I just think I'm Free";
send_to_class($data);
and my html
<span class="username"></span>
The Function is declared before the send_to_class($data) is initiated.
The P's and the E's are showing up just fine, there's just no middle sentence.
I've tried divs, id's and classes, adding css and changing the script tag.
2 things, a) how do I get the function to work which appends $data to the .username class and b) how do I get it to work if $data is an array? Can Javascript print php arrays in this manner?
Thanks.

I found that because the $data I was sending contained "'s that it needed to have the "'s escaped. So in my php file that was producing the data, I had to turn the following:
<div class="class1">some words</div>
into this:
<div class=\"class1\">some words</div>
This is because it's javascript that's doing the printing, and when javascript does printing of "'s it needs to have them escaped with a backslash like this \".

Find and replace <?php & ?> in string

I have a large string of valid HTML code that will be inserted into the DOM, the string also contains PHP code. I want the php code to be displayed as plain text, Chrome automatically comments out the PHP code. Obviously the PHP code is wrapped in <?php ... ?> so my question is:
How can I replace the open <?php with a <span> tag, and replace the ?> with a </span> to close the open <span> tag so that the PHP code is within the <span> tags and therefor visible as plain text?
EDIT: I will be wrapping the PHP code back in <?php ?> by replacing the span, so escaping the characters will make that more difficult.

You could escape it.
From:
https://css-tricks.com/snippets/javascript/htmlentities-for-javascript/
function htmlEntities(str) {
return String(str).replace(/&/g, '&').replace(/</g, '<').replace(/>/g, '>').replace(/"/g, '"');
}

As you say that the HTML is a string, you can easily just use the replace() function.
var html = // your html
var sanitized = html.replace(/<\?php/g, "<span>").replace(/\?>/g, "</span>");

Use Regular Expressions!
RegExp101 is a great playground.
Remember to change the flavor on the left menu to JavaScript.
The easiest way is using the .replace() function.
var str = str.replace(/(<\?php)|(<\?)|(<\?=)/g, '<span>').replace(/(\?>)/g, '</span>');
Edit: As requested by Get Off My Lawn, I've added support to <?= nd <? tags. The pipe | represents an or in Regular Expressions.

Syntax Error:expected expression got end of script

I Tried lot but can't solve this problem
Here is my Code:
<?php
while($crow = mysqli_fetch_assoc($cres)) {
echo '
<div class="item" onclick="window.open("'.$crow["c_link"].'");window.open("'.$crow["c_link"].'","_self")<img src="images/carousel/'.$crow["c_pic"].'" alt="'.$crow['c_nm'].'"></div>
';
}
?>
There is error Like this:
I also tried another answer of this problem but it is not working for me.
can anybody please tell me how to solve this ?

Problem is with mixed quotes and aprostrophes
onclick="window.open("
You open onclick attribute value with " character and then close the attribute just after window.open(. Instead of the second " use \' or IMO even better close PHP mode, print HTML code and open PHP mode only to print PHP values
while($crow = mysqli_fetch_assoc($cres)) {
?><div class="item" onclick="window.open('<?=$crow['c_link']?>'); window.open('<?=$crow['c_link']?>');"><img ... ></div><?php
}
?>
this way it's easier to not get confused by combination of JS and PHP quotes and apostrophes.

Javascript / Php : set textarea value

I have the following script, which returns 2 values from my database.
$(document).ready(function() {
<?
$link=new mysqli($serveur,$login,$pass,$base);
mysqli_set_charset($link, "utf8");
$r=mysqli_query($link, "select sujet,corps from mail where type='Création_rationnaire'");
while($row = mysqli_fetch_array($r)) {
?>
document.getElementById("sujet").value="<? echo $row[sujet];?>";
document.getElementById("te").value="<? echo $row[corps];?>";
<? }mysqli_close($link); ?>
});
Here are my 2 forms, one is a classic Input, the other is a textarea.
<input id='sujet' class="form-field">
<textarea id="te" class="textarea" rows="9" cols="70"></textarea>
The problem is : my SQL request works in MySQL, but when "corps" is echoed as above, nothing appears in the Inputs, like the script was crashing... Only "sujet" can be echoed successfully. So... why, just why ? Thanks in advance for whoever helps me.
EDIT : all I can echo in the "te" textbox is a single string like this : echo 'something';... but nothing else works...

Try this
document.getElementById("sujet").value="<? echo $row['sujet'];?>";
document.getElementById("te").text="<? echo $row['corps'];?>";
or if you use jquery
var message = <?php echo $row['corps']; ?>;
$("#te").val(message);
Textarea does not have a value but it does have text.
in an input box you would have <input type="text" value="example" /> and in a text area the value is inside the element like so
<textarea>example</textarea>
A other way is to use innerHtml (javascript) or html (jquery) .
But note that html tags will be display with one of these options

document.getElementById("te").innerHTML="<? echo $row['corps'];?>";

<textarea> doesn't have value property. Since you are using jQuery to bind document ready, you can use jQuery to set the value.
$("#sujet").val("<? echo $row[sujet];?>");
$("#te").html("<? echo $row[corps];?>");

What is the value of $row[corps]? Is it empty string? Does it contain double quote, or newline characters? If it contains any of them, it will break your javascript source code. What does javascript source code look like when you check source code inside the browser?

It works by inserting the values directly into the plain html forms. I usually use this javascript function because I have tons of forms to fill in my program, and it never failed until now... So my function above was good, but we still don't know why it failed in this particular case...
Problem solved anyways... thanks to everyone.

Apostrophes issu with php and jscript

I have this piece of code, which doesn't work, I couldn't find where is the problem?
$texttt = "blabla";
echo "<div onclick='select(\" page d \' accueil \");'>".$texttt."</div><br/>";
function select(text){
alert(text);
}

" is breaking your php statement
echo "<div onclick=\"select(' page d\' accueil ');\">\"Page d'accueil\"</div><br/>";
function select(text){
alert(text);
}
try to use addslashes and htmlentities to escape the quotes between text
$texttt = htmlentities(addslashes($text), ENT_QUOTES);
echo "<div onclick='select(\"$texttt\");'>$texttt</div><br/>";

Use single quotes for PHP. I use single quotes for PHP (which is server side script) and double quotes for client side scripts unless it is not obligatory.
echo '<div onclick="select(\'page d\'accueil\');">"Page d\'accueil"</div><br/>';
the problem is sourced by single quote in d'accueil:
I dont know if it is possible to escape a string which is located in another escaped string.
The possibilities:
You can change the grammar rules of your language:
Affects too many people.
Not applicable.
You can change the way of typing single quote: using ' in context.
I have typed a new code (which is working well) for you :
<?php
echo '<div onclick="select(this.innerHTML);">"Page d'accueil"</div><br/>';
?>
<script>
function select(text){
alert(text);
}
</script>

you should avoid useless quotes before you get lost inside.
"Page d'accueil" don't need to be between quotes so remove them.
Use one kind (single or double quotes) for the first level of quoting, and the other for the next levels, and keep that it mind.
<? php echo '<div onclick="select(\" page d\' accueil \");">Page d\'accueil</div><br/>'; ?>
<script type="text/javascript">
function select(text){
alert(text);
}
</script>

you can use heredoc syntax
refreence : http://www.php.net/manual/en/language.types.string.php#language.types.string.syntax.heredoc
echo <<<EOT
My name is "$name". I am printing some $foo->foo.
Now, I am printing some {$foo->bar[1]}.
This should print a capital 'A': \x41
EOT;
also try this:
echo json_encode("<div onclick='select(" page d ' accueil ");'>{$texttt}</div><br/>");