php - Page refreshing on Submit -


i'm following tutorial:

http://www.plus2net.com/php_tutorial/ajax-search.php

they provided me i'm looking for. problem i'm facing is, when press enter button, page refreshing :( don't want that.

demo:

http://www.plus2net.com/php_tutorial/ajax-search-demo.htm

html code 

<html> <body>     <style>         #displaydiv         {             background-color: #ffeeaa;             width: 200;         }     </style>     <script type="text/javascript">         function ajaxfunction(str) {             var httpxml;             try {                 // firefox, opera 8.0+, safari                 httpxml = new xmlhttprequest();             }             catch (e) {                 // internet explorer                 try {                     httpxml = new activexobject("msxml2.xmlhttp");                 }                 catch (e) {                     try {                         httpxml = new activexobject("microsoft.xmlhttp");                     }                     catch (e) {                         alert("your browser not support ajax!");                         return false;                     }                 }             }             function statechanged() {                 if (httpxml.readystate == 4) {                     document.getelementbyid("displaydiv").innerhtml = httpxml.responsetext;                  }             }             var url = "ajax-search-demock.php";             url = url + "?txt=" + str;             url = url + "&sid=" + math.random();             httpxml.onreadystatechange = statechanged;             httpxml.open("get", url, true);             httpxml.send(null);         }     </script>     </head>     <body>         <form name="myform">         <input type="text" onkeyup="ajaxfunction(this.value);" name="username" />         <div id="displaydiv">         </div>         </form>     </body> </html>

php code (ajax-search-demock.php)

<? //*************************************** // downloaded www.plus2net.com // /// can distribute code link www.plus2net.com /// // please don't remove link www.plus2net.com /// // learning not commercial use. /////// //the author not responsible type of loss or problem or damage on using script.// /// can use @ own risk. ///// //***************************************** //error_reporting(e_error | e_parse | e_core_error); ////// database details here ///////// $dbservertype='mysql'; $servername='127.0.0.1'; $dbusername='test'; $dbpassword='test'; $dbname='sql_tutorial';  //////////////////////////////////////// ////// donot edit below ///////// ///////////////////////////////////////  connecttodb($servername,$dbname,$dbusername,$dbpassword); function connecttodb($servername,$dbname,$dbuser,$dbpassword) {   global $link;   $link=mysql_connect ("$servername","$dbuser","$dbpassword");   if(!$link){die("could not connect mysql");}   mysql_select_db("$dbname",$link) or die ("could not open db".mysql_error()); } ///////////////////// main code sarts ////////   $in=$_get['txt']; $msg=""; if(strlen($in)>0 , strlen($in) <20 ){   $t=mysql_query("select name, id student name '$in%'");   while($nt=mysql_fetch_array($t)){     $msg.=$nt[name]."->$nt[id]<br>";   } } echo $msg;  ?>

update :

ok enter thing solved :d great!!.. have 1 more request please

i want data when input reaches 8 characters. possible ?

you're not submitting anything, technically don't need <form> element @ all, remove , leave rest is.

alternatively, if you're stickler strict standards, set action="javascript:void(null) on form prevent doing anything.


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