Pass filenames by to my javascript files

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I need to pass by a filename and location (send_message.php) from my wordpress plugin to a javascript file, so that I can use send_message.php with ajax in my js.

Now first thing I thought is to just echo the name in a hidden div or set it as an attribute of some tag and then readout that value with js. but that doesn’t seem good practise.

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in IRC they told my to echo a <script type='application/javascript'> var filename = <?php echo plugins_url(...) ?>, but that doesn’t work because I can’t access the variable too, and form my feeling thats also not very nice practise.

another idea was to make a *.php file with header('Content-Type: text/javascript') and then setting the variable there with var filename = <?php.... That seems like a nice way for my (if using php files as javascript is ok? :P). but it doesn’t work because wordpress tells me that plugins_url() is not defined when I call it from that file somehow?

Is that a good way or is there maybe a better? (And if it is a good way, how do I use plugins_url inside my iAmJS.php file)

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2 comments 

  1. var filename = <?php echo plugins_url(...) ?>

    This isn’t working because plugins_url probably contains a string. Add quotes around it so JavaScript will treat it as a string:

    var filename = '<?php echo plugins_url(...) ?>';

  2. you can sniff it out in JS from an external file:

    (function(){ // script filename setter, leaves window.__filename set with active script URL.
if(self.attachEvent){
 function fn(e,u){self.__filename=u;}
 attachEvent("onerror",fn);
 setTimeout(function(){detachEvent("onerror", fn)},20);
 eval("gehjkrgh3489c()");
}else{
 Object.defineProperty( window, "__filename", { configurable: true, get:function __filename(){
   try{document.s0m3741ng()}catch(y){
    return "http://" + 
     String(y.fileName || y.file || y.stack || y + '')
     .split(/:d+:d+/)[0].split("http://")[1];
    } 
 }})//end __filename
}//end if old IE?
}());


//demo:
alert(__filename);

    a bit ugly i admit, but it works, even in IE…

    if you don’t care about IE, it can be much shorter:

    Object.defineProperty( window, "__filename", { configurable: true, get:function __filename(){
   try{document.s0m3741ng()}catch(y){
    return "http://" + 
     String(y.fileName || y.file || y.stack || y + '')
     .split(/:d+:d+/)[0].split("http://")[1];
    } 
}})//end __filename