how to give a line break with the javascript string without breaking javascript code?

Question

I need to add a break in the javascript with the below situation.

<?php
$str_alert = "";
if(isset($case1)){
    $str_alert .= "have case1 \n";
}
if(isset($case2)){
    $str_alert .= "have case2 \n";
}
if(isset($case3)){
    $str_alert .= "have case3 \n";
}
if(!empty($str_alert)){
?>
<script type="text/javascript" >
$(document).ready(function(){
     alert("<?=$str_alert?>");
});
</script>

it break the javascript code and shows the error

SyntaxError: unterminated string literal

please give me any solution

B. Desai · Accepted Answer · 2017-08-31 07:00:50Z

1

Add \ to escape \n in php. Try following code

<?php
$str_alert = "";
if(isset($case1)){
    $str_alert .= "have case1 \\n";
}
if(isset($case2)){
    $str_alert .= "have case2 \\n";
}
if(isset($case3)){
    $str_alert .= "have case3 \\n";
}
if(!empty($str_alert)){
?>
<script type="text/javascript" >
$(document).ready(function(){
     alert("<?=$str_alert?>");
});
</script>

answered Aug 31, 2017 at 7:00

B. Desai

16.4k5 gold badges28 silver badges48 bronze badges

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

Comments

Quentin · Accepted Answer · 2017-10-05 10:07:08Z

1

You need to represent characters that are not allowed as literals in JS strings (like new lines) by escape characters.

Since JSON is a data format based on a subject of JavaScript's literal syntax, you can use PHP's json_encode function to convert any basic data type (string, number, array, associative array) into JavaScript code with all the correct escape characters.

By default it will even escape / so you can safely output the string </script>.

alert(<?=json_encode($str_alert);?>);

Since the " will be included in the JSON, you should not add them manually.

answered Oct 5, 2017 at 10:07

Quentin

949k136 gold badges1.3k silver badges1.4k bronze badges

Comments

l.g.karolos · Accepted Answer · 2017-08-31 06:59:45Z

0

Javascript strings can't break across newlines without an escape (). See this question for detailed answers:

How do I break a string across more than one line of code in JavaScript?

answered Aug 31, 2017 at 6:59

l.g.karolos

1,1421 gold badge10 silver badges25 bronze badges

Collectives™ on Stack Overflow

how to give a line break with the javascript string without breaking javascript code?

3 Answers 3

Comments

Comments

Comments

Your Answer

Linked

Hot Network Questions

Collectives™ on Stack Overflow

3 Answers 3

Comments

Comments

Comments

Your Answer

Sign up or log in

Post as a guest

Linked

Related