Menu
I have code like this:
<?php
echo '<script type="text/javascript">';
echo 'var out="'.$txt.'";';
echo '</script>';
?>
Where $txt is a PHP variable that can contain newlines like this:
line1
line2 hello world
Which would end up like this:
var out="line1
line2 hello world";
Which will cause a Javascript error, of course.
What is the best way to handle this? The out variable will be used in a HTML textarea, so I don't think it can be parsed into <br>
985
The newline character is \n in JavaScript and many other languages. All you need to do is add \n character whenever you require a line break to add a new line to a string.
Using new line tags: Newline characters \n or \r\n can be used to create a new line inside the source code.
The nl2br() function inserts HTML line breaks (<br> or <br />) in front of each newline (\n) in a string.
Most of these don't work for me. Normally, I'd use json_encode like
<?php
$MyVar = json_encode($MyVar);
?>
<javascript language='javascript'>
MyVar = <?php echo $MyVar; ?>
But for a quick fix you can just break a line like this: Pay attention to the double quotes.
<?php
$MyVar = "line one here
then line two here
finally line five here";
//** OR
$MyVar = $MyVarA .
"
"
. $MyVarB;
?>
<HTML>
<HEAD>
<javascript language='javascript'>
Myvar = "<?php echo $MyVar; ?>";
. . .
95
$txt = str_replace( array( "\n", "\r" ), array( "\\n", "\\r" ), $txt );
should replace newlines. Don't do it this way.
This is a naïve implementation of string escaping for JavaScript. As you're actually trying to format a string for use in JavaScript, a much better solution would be to use json_encode:
$txt = json_encode($txt);
echo "<script>var out={$txt};</script>";
json_encode will correctly escape special characters in strings, such as quotes, tabs, form feeds, and other special unicode characters. It will also perform all the correct escaping for converting objects, arrays, numbers, and booleans.
25
you can add a \ at the end of a line to create a multi line String
var out="line1 \
line2 hello world";
If you love us? You can donate to us via Paypal or buy me a coffee so we can maintain and grow! Thank you!
Donate Us With
