php - auto search the keyword in textarea -

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this coding. coding allows me search keyword in database , worked fine. how can search keyword without click search button? want same search function in google search. can automatically search , review without hit button.

<html>    <head>      <meta  http-equiv="content-type" content="text/html;  charset=iso-8859-1">      <title>search  contacts</title>    </head>    <p><body>      <h3>search  contacts details</h3>      <p>you  may search either first or last name</p>      <form  method="post" action="search.php?go"  id="searchform">        <input  type="text" name="question">        <input  type="submit" name="submit" value="search">      </form>       <?php    if(isset($_post['submit'])){    if(isset($_get['go'])){    if(preg_match("/^[  a-za-z]+/", $_post['question'])){    $question=$_post['question'];       $con = mysqli_connect("localhost","root","");     mysqli_select_db($con,"search")or die(mysqli_error($con));;     $sql="select  id , question question question '%" . $question .  "%'";    //-run  query against mysql query function    $result=mysqli_query($con, $sql);    while ($row=mysqli_fetch_array($result)){            $question  =$row['question'];             $id=$row['id'];     echo "<ul>\n";    echo "<li>" . " " . $question .  "</li>\n";    echo "</ul>";    }    }    else{    echo  "<p>please enter search query</p>";    }    }    }  ?>    </body>  </html>  </p>

well, way google bit different. however, can use javascript (jquery easiest here) send xhr, retrieve results. this

$('input[name="question"]').on('keyup', function (e) {     $.ajax({         url: "search.php?go",         method: 'post',         data: {             query: e.target.val()         }     }).done(function(data) {         // output data want     }); }

of course, use get http method, that's preference.

now, aside this, looks have sql injection vulnerability in query. essentially, if input 'drop database question search query, drop database. should doing using prepared statements using mysql::prepare, see docs here.

final note: google not way. best way achieve blazing fast search results using websockets maintain socket connection server, , letting search run through document database such elasticsearch, optimised full-text search.


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