Problem when retrieving text in JSON format containing line breaks with jQuery

I'm having a strange problem when retrieving JSON formatted text. I use jQuery post to send some data (also JSON formatted) to the server (running PHP) which works fine. Then, when I request the same data from the server using jQuery get, the callback method never executes. This only occurs when the data is JSON formatted and the data contains a line break. When I don't use JSON formatting it works fine. What baffles me is that there are no problems with uploading the data.

Uploading code: (works)

$.post("ajax/contents_ajax.php", {
    'title': caption,
    'text': frameText().getContent(),
    'image_id': img
},
//Callback

Download code: (doesn't work with line breaks)

$.get("ajax/contents_ajax.php", { 'get_item': id },
function (data){
    //Never gets executed if data contains line breaks
}
,'json');

The whole problem stems from the fact that the TinyMCE rich text editor seems to insist on inserting line breaks everywhere, even though I enabled the option

remove_linebreaks : true

I do prefer to have line breaks, but not if they break my code. Can anyone tell me what the problem is here, and perhaps how I can encode the linebreaks on the server with PHP?

Update

While the suggestions to replace '\n' with '' did not work, it was close to the right solution. This code removed the offending characters:

function parse($text){
    $parsedText = str_replace(chr(10), "", $text);
    return str_replace(chr(13), "", $parsedText);

}

If you would like to keep the line breaks, you might try:

function parse($text) {
    // Damn pesky carriage returns...
    $text = str_replace("\r\n", "\n", $text);
    $text = str_replace("\r", "\n", $text);

    // JSON requires new line characters be escaped
    $text = str_replace("\n", "\\n", $text);
    return $text;
}

Line breaks aren't the issue so much as they need to be properly escaped in JSON. If it's available to you, you can use json_encode which automatically escapes newlines. Failing that, you can use something like Pim Jager's method above, though a proper JSON encoder would be best.

I encountered that problem while making a class in PHP4 to emulate json_encode (available in PHP5). Here's what i came up with :

class jsonResponse {
    var $response;

    function jsonResponse() {
        $this->response = array('isOK'=>'KO','msg'=>'Undefined');
    }

    function set($isOK, $msg) {
        $this->response['isOK'] = ($isOK) ? 'OK' : 'KO';
        $this->response['msg'] = htmlentities($msg);
    }

    function setData($data=null) {
        if(!is_null($data))
            $this->response['data'] = $data;
        elseif(isset($this->response['data']))
            unset($this->response['data']);
    }

    function send() {
        header('Content-type: application/json');
        echo '{"isOK":"'.$this->response['isOK'].'","msg":'.$this->parseString($this->response['msg']);
        if(isset($this->response['data']))
            echo ',"data":'.$this->parseData($this->response['data']);
        echo '}';
    }

    function parseData($data) {
        if(is_array($data)) {
            $parsed = array();
            foreach ($data as $key=>$value)
                array_push($parsed, $this->parseString($key).':'.$this->parseData($value));
            return '{'.implode(',', $parsed).'}';
        } else
            return $this->parseString($data);
    }

    function parseString($string) {
            $string = str_replace("\\", "\\\\", $string);
            $string = str_replace('/', "\\/", $string);
            $string = str_replace('"', "\\".'"', $string);
            $string = str_replace("\b", "\\b", $string);
            $string = str_replace("\t", "\\t", $string);
            $string = str_replace("\n", "\\n", $string);
            $string = str_replace("\f", "\\f", $string);
            $string = str_replace("\r", "\\r", $string);
            $string = str_replace("\u", "\\u", $string);
            return '"'.$string.'"';
    }
}

I followed the rules mentionned here. I only used what i needed but i figure that you can adapt it to your needs in the language your are using. The problem in my case wasn't about newlines as i originally thought but about the / not being escaped. I hope this prevent someone else from the little headache i had figuring out what i did wrong.

do you get linebreaks like <br /> or newlines like \n? But try to replace them with PHP.

<?php
$string = 'asdfasf<br />asdfasf';
echo str_replace('<br />', '', $strin); // Replace <br /> with '' (nothing)
?>

or check out urlencode

Like Terw but with replacing \n

<?php
 $json = str_replace('\n', '', $json);
?>

Should remove all line breaks, jquery shouldn't fail over
tags, but line breaks should not be in JSON.

r4wi

Have you tried this

update tablename set field_name_with_\r\n_in_it = replace(field_name_with_\r\n_in_it,"\r\n","<br />")

It worked for me on mysql 5.0.45

Easy, just try:

<?php
...
function parseline($string){
  $string = str_replace(chr(10), "//n", $string);
  $string = str_replace(chr(13), "//n", $string);
  return $string;
}

echo parseline($string_with_line_breaks);//returns json readable text

I have tested it and it works perfect. No need to add complicated functions.

If the other responses didn't work, it's possible to strip all whitespace characters except the space.

PHP $text = trim(preg_replace( "/[\\x00-\\x19]+/" , '' , $text));

From: https://github.com/joomla/joomla-cms/issues/14502

You can also use <pre> tag that will keep all line breaks and white spaces. I am posting this answer because i also encounter that problem and for solutions i reached to this question and after that I randomly decided to use <pre> tag instead of <div> and that solved by problem although at many places there were unwanted back slashes \

来源：https://stackoverflow.com/questions/395379/problem-when-retrieving-text-in-json-format-containing-line-breaks-with-jquery

标签

jquery

json

tinymce

line-breaks