javascript - Load and execute conditionally an external js file -


i'd load , execute external javascript file (google adwords's conversion script) if condition met. similar questions have been asked, i've tried solutions didn't work. i've following code :

<script>          $(function() {              if ([condition]) {                  $.getscript('//www.googleadservices.com/pagead/conversion.js');              }          });  </script>

the script loaded isn't executed. how do execute ?

i've tried change getscript() 

var script = document.createelement("script" );  script.setattribute("src", "//www.googleadservices.com/pagead/conversion.js" );  document.getelementsbytagname("head" )[0].appendchild(script);

but didn't work well.

thanks !

@vlas: oops pasted wrong thing, corrected

@ejay_francisco: tried create script tag , append head doesn't work

@barar: mean page downloads script file doesn't execute it. yes, if want full code :

<!-- google code formulaire contact conversion page -->          <script type="text/javascript">             /* <![cdata[ */             var google_conversion_id = [...];             var google_conversion_language = "en";             var google_conversion_format = "3";             var google_conversion_color = "ffffff";             var google_conversion_label = "[...]";              var google_remarketing_only = false;             /* ]]> */         </script>         <!-- <script type="text/javascript"  src="//www.googleadservices.com/pagead/conversion.js"></script> -->         <script type="text/javascript"  src="//code.jquery.com/jquery.min.js"></script>         <script>         $(function() {             if ([condition]) {                 $.getscript('//www.googleadservices.com/pagead/conversion.js');                 $("#google_conversion").attr('src','//www.googleadservices.com/pagead/conversion/[...]/?label=[...];guid=on&amp;script=0');             }         });         </script>         <div style="display:inline;">             <img id="google_conversion" height="1" width="1" style="border-style:none;" alt=""  src="#"/>         </div>

in long run you'd better off using proper asynchronous version of adwords conversion script think has been built handle these sorts of things. way avoids encoding mistakes , easier read , maintain.

so, based on here reckon you'd want (although no jquery expert - prefer use standard javascript hey each own):

<head>   <!-- add async conversion script usual - use async if want --->   <script type="text/javascript" src="http://www.googleadservices.com/pagead/conversion_async.js" charset="utf-8"></script> </head>  <!-- rest of site html , code -->  <script> $(function() {   if ([condition]) {     window.google_trackconversion({       google_conversion_id: "[...]",       google_conversion_language: "en",       google_conversion_format: "3",       google_conversion_color: "ffffff",       google_conversion_label: "[...]",       google_conversion_value: 0,       google_remarketing_only: false     });   } }); </script>

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