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How to use SMARTY variables in JavaScript
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mohrt
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Joined: 16 Apr 2003
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Location: Lincoln Nebraska, USA

PostPosted: Thu Aug 08, 2013 2:14 pm    Post subject: Re: Use {/literal} tag before the javascript variable Reply with quote

vignates wrote:
Refer this article, which clearly gives how to use smarty variable inside javascript function or code.

http://www.iamrookie.com/blog/296/using-smarty-variable-within-javascript-or-jquery-function.html


Food for thought: Smarty doesn't care about "javascript", it doesn't even know what javascript is. What it does care about however, are {} characters in templates that are not part of Smarty syntax. These can create syntax errors.

So, in that example code:

Code:
{literal}<script type="text/javascript">
var newVar = "{/literal}{$dynamicValue}{literal}";
</script>{/literal}


There is no reason to use {literal}{/literal} tags here, since there are no conflicting {} characters in the javascript. So, this will work just the same:

Code:
<script type="text/javascript">
var newVar = "{$dynamicValue}";
</script>


That said, it is possible that there are rogue characters in the smarty var that javascript may not like, so just escape them:

Code:
<script type="text/javascript">
var newVar = "{$dynamicValue|escape:javascript}";
</script>


The only time {literal} tags are used is when the javascript contains {} characters that you want Smarty to ignore:

Code:
var foo = function() {
   return '{$myVar}';
}


The above code is fine in Smarty 3, as it will ignore {} surrounded by white space. Smarty 2 however, needs a little help. Either use literal tags like so:

Code:
var foo = function() {literal}{{/literal}
   return '{$myVar}';
{literal}}{/literal}


or a clearer method, escape the braces:

Code:
var foo = function() {$smarty.lbrace}
   return '{$myVar}';
{$smarty.rbrace}


And of course, don't forget to escape the variable:

Code:
var foo = function() {$smarty.ldelim}
   return '{$myVar|escape:javascript}';
{$smarty.rdelim}


Everything above is assuming your Smarty delimiters are { and } respectively. If you change them to something else like {{ }} or <% %> then javascript escapement becomes a non-issue as well.
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