在wordpress仪表板中调用Ajax

I am creating a plugin in WP in which ,I have simple form I am making call to DB but it is not responding and no reply is received.I think there is problem here

xmlhttp.open("GET","info.php?q="+val,true);
xmlhttp.send();

I even tried to make call through full path of info.php but it is not working.I can run the code fine seperately.I mean outside of Wordpress. Please suggest

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