How to eval an upload script result

I have this code where I upload several images at once and it does the multiple upload like a prophecy but the only problem is that the output is not “evaled” or does not execute any javascript. So for example on the output page if I do

<script> alert('Yes'); </script>

Nothing happens after the upload. Here is the code for multiple upload

<script>
 
 
 
        var handleUpload_afile = function(event){
              event.preventDefault();
              event.stopPropagation();
        
          var fileInput = document.getElementById('afile');
          var data = new FormData();
        
          for(var i = 0; i < fileInput.files.length; ++i)
          {
             data.append('afile[]',fileInput.files[i]);
          }
         
          
          
                if (window.XMLHttpRequest) 
                {
                    // code for modern browsers
                    xhr_afile = new XMLHttpRequest();
                } 
                else 
                {
                    // code for old IE browsers
                    xhr_afile = new ActiveXObject("Microsoft.XMLHTTP");
                } 
          
           
          
              xhr_afile.upload.addEventListener('progress',function(event){
           
               if(event.lengthComputable)
               {
            
                  var percent = event.loaded / event.total;
                  var progress = document.getElementById('upload_progress_afile');
            
                        while (progress.hasChildNodes())
                        {
                               progress.removeChild(progress.firstChild);
                        }
                        
                     
               }
           
        });
        
                    xhr_afile.upload.addEventListener('load',function(event)
                    {
                    /*
                    document.getElementById('upload_progress_afile').style.display = 'none';
                    */
                    });
                    
                    xhr_afile.upload.addEventListener('error',function(event)
                    {
                    
                    alert("failed");
        
                    });
        
        
                   xhr_afile.open('POST','upload_multiple_article_gallery_travail.php');
                   
                   
                   xhr_afile.setRequestHeader('Cache-Control','no-cache');
                    
                   
                   xhr_afile.upload.onprogress = function(e) 
                  {
                    if (e.lengthComputable) 
                    {
                      var percentComplete = (e.loaded / e.total) * 100;
                       
                      document.getElementById("upload_progress_afile").innerHTML="<img src='images/facebook_style_loader.gif'  width='16' height='11'> <br>" + (Math.round(percentComplete)-1) + ' % uploding'; 
                       
                    }
                  };
                   
                   
                   xhr_afile.onload = function() 
                  {
                        if (this.status == 200) 
                        {
                            
                            
                                if (document.getElementById)
                                {   
                     
                                document.getElementById("upload_progress_afile").innerHTML=xhr_afile.responseText;
                                
                                }
                            
                         
                          
                        }
                  };
         
                    
                   xhr_afile.send(data);
         
                   
        };

 
 

//We submit the form as soon as the file changes
  var uplodons = document.getElementById('afile');
           uplodons.addEventListener('change',handleUpload_afile);
       
</script>

On the page upload_multiple_article_gallery_travail.php I need to be able to call and execute javascript but it does not work. So how to eval the output after upload so the javascript on the page upload_multiple_article_gallery_travail.php will be executed ?