javascript - JS Form Validation not working for simple html form -


i have simple html form 1 filed. form follows- 

<table>      <form action="insert.php" method="post" name="discover" onsubmit="return discover()">     <tr><td></td><td><input type="text"  name="name"></td></tr>                                                                  <tr><td></td><td><br><br><p class="submit"><input type="submit" id="submit" name="commit" value="register"></p><br><br><br></td></tr>     </form> </table>

the validation js file is- 

function discover() {    var stu_name=document.forms["discover"]["name"].value;     if (stu_name==null || stu_name=="" || stu_name.length<7) {       alert("please provide full name");       return false;    }   }

i have included validation js file properly. validation not working. link forjsfiddle

try this

<script type="text/javascript"> function check() { var stu_name=document.forms["discover"]["stu_name"].value; if (stu_name==null || stu_name=="" || stu_name.length<7)   {   alert("please provide full name");   return false;   } } </script> <form action="" method="post" name="discover" id="discover" onsubmit="return check();"> <input type="text" name="stu_name" id="stu_name" value="" /> <input type="submit" id="sub" /> </form>

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