php - How i can prevent form from refreshing page after submit -


i'm using chat script internet,very simple , effective when press submit button refreshes whole page.i want refresh form not entire page because use tabs.i use 3 tabulators: workspace , chat, , news , when click chat opens tabulator , when click submit refresh whole page , starts workspace tab.

here code.

function ajax(){      var req = new xmlhttprequest();      req.onreadystatechange = function(){  	if(req.readystate == 4 && req.status == 200){  	    document.getelementbyid('chat').innerhtml = req.responsetext;  	}       }      req.open('get','chat.php',true);       req.send();  }  setinterval(function(){ajax()},1000);
.chat_s {      margin-top:20px;      padding:20px;      width:100%;      height:200px;      background-color: #f1f1f1;      border-radius: 3px;  }  .chat_s textarea {      width:400px;      background-color:#f9f9f9;      height:70px;      border:none;      resize: none;      outline:none;      font-size:13px;      padding:20px;  }  .chat_s input[type=submit]{      background-color:#e7544a;      color:white;      height:30px;      width:100px;      margin-top:40px;      display:block;  }
                    <div class="chat_s">                          <form id="chat_f" method="post" action="list.php">                      <input type="hidden" name="name" value="<?php echo $user_name;?>"/>                       <input type="hidden" name="img" value="<?php echo $user_img;?>"/>                      <input type="hidden" name="role" value="<?php echo $user_role;?>"/>  		            <textarea name="msg" placeholder="upisite vasu poruku."></textarea>  		            <input type="submit" name="send_msg" value="posalji"/>                              <br/>                          </form>                      </div>

can me when user press submits refresh div.


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