passing javascript variable to html5 video source -

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i want pass javascript variable src html5 video video changes dynamically based on js variable value. not able achieve 

<script type="text/javascript">          var path = "/api/videos/mp4/";          var filename = '@viewbag.filename';          var fullpath = path.concat(filename);          document.getelementbyid('fullpath1').src = fullpath.tostring();          </script>
<p><script type="text/javascript">document.write(fullpath)</script></p>   <video width="480" height="320" controls="controls" autoplay="autoplay">       <source src="fullpath1" type="video/mp4">   </video>

please me working. thanks!

you looking element id

document.getelementbyid('fullpath1').src = fullpath.tostring();

but haven't yet define id:

<source src="fullpath1" type="video/mp4">

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