play iframe video on click a link javascript

This works, it appends autoplay=1 to the url causing the video to start playing.

addendum: If your video's source does not already have a querystring then it would be prudent to add a ? instead of a &, as is sometimes the case. This can be done by looking for its existence.

<iframe id="video1" width="520" height="360" src="http://www.youtube.com/embed/TJ2X4dFhAC0?enablejsapi" frameborder="0" allowtransparency="true" allowfullscreen></iframe>
<a href="#" id="playvideo">Play video</a>
<script>
 //use .one to ensure this only happens once
 $("#playvideo").one(function(){
  //as noted in addendum, check for querystring exitence
  var symbol = $("#video1")[0].src.indexOf("?") > -1 ? "&" : "?";
  //modify source to autoplay and start video
  $("#video1")[0].src += symbol + "autoplay=1";
 });
</script>

However, most people inherently understand that if they want a video to play, they will just click on it and I would suggest just leaving that to them or starting the video off with autoplay.

Also need to mention that autoplay does not work on mobile devices (powered by Android or iOS)

I correctly set in end src - ?autoplay=1

   <iframe id="video1" width="450" height="280" src="http://www.youtube.com/embed/TJ2X4dFhAC0?enablejsapi" frameborder="0" allowtransparency="true" allowfullscreen></iframe>
    <a href="#" id="playvideo">Play button</a>
    <script>
     $("#playvideo").click(function(){
      $("#video1")[0].src += "?autoplay=1";
     });
    </script>