javascript - How can I print PHP POST data using AJAX? (no jQuery) -

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so i've got html.

<form  method="post" id="myform" onsubmit="getdata()"> <fieldset> <legend>form</legend> <label>color: <input type='text' id="color" name='color'></label> <label><input type="submit"></label> </fieldset> </form> <div id="showoutput">  </div>

this php:

<?php $color = $_post['color'];      if($color != "")     {     $color = htmlentities($color, ent_quotes);     print "<p>the color $color</p>";     }     else     {     print "<p>fill out form!</p>";     }  ?>

and js:

window.onload = getdata;  var req = new xmlhttprequest();  function getdata() { var poststr = "color=" + encodeuri( document.getelementbyid("color").value );  req.open("post", "lab11-1.php", true); req.onreadystatechange = useresponse; req.setrequestheader("content-type", "application/x-www-form-urlencoded");  req.send(poststr);  }  function useresponse() {     if(req.readystate == 4)     {         if(req.status == 200)         {         document.getelementbyid('showoutput').innerhtml = req.responsetext;         }     } }

i'm trying able input color in form, hit submit, , use ajax print php "showoutput" div in html. i've tried can think of , haven't been able figure out.

i think not correct. ajax don't need form submit function,

i did this, think want it.

<form  method="post" id="myform"> <fieldset> <legend>form</legend> <label>color: <input type='text' id="color" name='color'></label> <label><input type="button" onclick="getdata()" value="submit"></label> </fieldset> </form> <div id="showoutput">  </div> <script> window.onload = getdata;  var req = new xmlhttprequest();  function getdata() { var poststr = "color=" + encodeuri( document.getelementbyid("color").value );  req.open("post", "test.php", true); req.onreadystatechange = useresponse; req.setrequestheader("content-type", "application/x-www-form-urlencoded");  req.send(poststr);  }  function useresponse() {     if(req.readystate == 4)     {         if(req.status == 200)         {         document.getelementbyid('showoutput').innerhtml = req.responsetext;         }     } } </script>

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