background.html

<script>
var seltext = null;
document.addEventListener('mouseup',function(event)
{
    var sel = window.getSelection().toString();
     
    if(sel.length)
        chrome.extension.sendRequest({'message':'setText','data': sel},function(response){})
    //var jax = new XMLHttpRequest();
    var url = "https://search-production.ratemyprofessors.com/solr/rmp/select/?solrformat=true&rows=2&wt=json&q="+name+"+AND+schoolname_t:The University of Texas at Dallas";
    
    var xhr = new XMLHttpRequest();
    xhr.open("GET", url, true);
    xhr.onreadystatechange = function() {
      if (xhr.readyState == 4) {
        // JSON.parse does not evaluate the attacker's scripts.
        var resp = JSON.parse(xhr.responseText);
        console.log(resp);
      }
    }
    xhr.send();
})
 /*
chrome.extension.onRequest.addListener(function(request, sender, sendResponse)
{
    switch(request.message)
    {
        case 'setText':
            window.seltext = request.data
        break;
         
        default:
            sendResponse({data: 'Invalid arguments'});
        break;
    }
});
 
 
function savetext(info,tab)
{
    var jax = new XMLHttpRequest();
    var url = "https://search-production.ratemyprofessors.com/solr/rmp/select/?solrformat=true&rows=2&wt=json&q="+name+"+AND+schoolname_t:The University of Texas at Dallas";
    jax.open("POST",url);
    jax.setRequestHeader("Content-Type","application/x-www-form-urlencoded");
    jax.send("text="+seltext);
    jax.onreadystatechange = function() { if(jax.readyState==4) { alert(jax.responseText);  }}
}
 
var contexts = ["selection"];
for (var i = 0; i < contexts.length; i++)
{
    var context = contexts[i];
    chrome.contextMenus.create({"title": "Send to Server", "contexts":[context], "onclick": savetext});  
}
 */
</script>