Grow your CSS skills. Land your dream job.

Last updated on:

Multiline String Variables in JavaScript

This works:

var htmlString = "<div>This is a string.</div>";

This fails:

var htmlSTring = "<div>
  This is a string.
</div>";

Sometimes this is desirable for readability.

Add backslashes to get it to work:

var htmlSTring = "<div>\
  This is a string.\
</div>";

Comments

  1. Dor
    Permalink to comment#

    Looks pretty cool. I was looking for a way to do that…

  2. try this

    <script type="text/javascript" src="http://ajax.googleapis.com/ajax/libs/jquery/1.4.4/jquery.min.js"></script>
    <div class="crazy_idea" thorn_in_my_side='<table border="0">
    <tr>
    <td ><span class="mlayouttablecellsdynamic">PACKAGE price $65.00</span></td>
    </tr>
    </table>'></div>
    <script type="text/javascript">
    alert($(".crazy_idea").attr("thorn_in_my_side"));
    </script>

  3. NIle
    Permalink to comment#

    This also works.
    [code]
    var htmlSTring = “”+
    ” This is a string.”+
    “”;
    [/code]

  4. Dom
    Permalink to comment#

    I really like this way:

    var htmlString = [
    ”,
    ”,

    ].join(”);

  5. Fabrizio Calderan
    Permalink to comment#

    Looking at this guide (under «Multiline string literals») this syntax don’t seems to be a good practice and it’s not part of ECMAScript (but I admit I like it anyway)

  6. hsablonniere
    Permalink to comment#

    Douglas Crockford advise not to use that because if you have a space character after the slash that escapes your multiline string it fails.

    Look at slide 12 : http://www.slideshare.net/douglascrockford/level-7-ecmascript-5-the-new-parts

    Try one of theses techniques : http://jsperf.com/zp-string-concatenation/5

  7. David
    Permalink to comment#

    If PHP is available, another option is to parse out the extra white space on the server like so (short tags could be useful here too, but not advised):

    
    var injection = "<?php
    ?><table><?php
        ?><tr><?php
            ?><td>Hello</td><?php
            ?><td>World!</td><?php
        ?></tr><?php
    ?></table>";
    

    I think Fabrizio is right, the escaping trick isn’t supported by the standard.

  8. Steve
    Permalink to comment#
  9. Wizard of Osch

    I find the following solution pretty nice, when the string comes from PHP.

    var MultiLine = '<?php echo str_replace("\n", "\\n", $the_string);?>'

  10. any help my code :

    i should error to my code :(

    When these folks get on board, the new passenger count is reported to the conductor. Build a string called countMessage that uses numPassengers to say:

    Attention: There are now 3 passengers on the train!

Leave a Comment

Posting Code

Markdown is supported in the comment area, so you can write inline code in backticks like `this` or multiline blocks of code in in triple backtick fences like ```this```. You don't need to escape code in backticks, Markdown does that for you.

Sadly, it's kind of broken. WordPress only accepts a subset of HTML in comments, which makes sense, because certainly some HTML can't be allowed, like <script> tags. But this stripping happens before the comment is processed by Markdown (via Jetpack). It seems to me that would be reversed, because after Markdown processes code in backticks, it's escaped, thus safe. If you think you can fix this issue, get in touch!

If you need to make sure the code (typically HTML) you post absolutely posts correctly, escape it and put it within <pre><code> tags.

Current ye@r *

*May or may not contain any actual "CSS" or "Tricks".