javascript - Field cannot be NULL -


how write code that,strictly must have value else "pay now" button not proceed.

for example fields

  • card type 1 value must @ selected 1
  • and enter card number must have value
  • and enter pin must have value

else "pay now" button display "please make sure details have been filled.

the html

<!doctype html> <html xmlns="http://www.w3.org/1999/xhtml"> <head> <title>terms & conditions</title> <link rel="stylesheet" type="text/css" href="css/format.css"> <link rel="stylesheet" href="/resources/demos/style.css"> <meta name="viewport" content="width=device-width, initial-scale=1"> <link rel="stylesheet" href="css/jquery.mobile-1.4.2.min.css"> <script src="js/jquery-1.10.2.min.js"></script>  <script src ="js/jquery-1.11.0.min.js"></script> <script src="js/jquery.cycle.all.js"></script> <style type="text/css"> </style> </head> <body background="images/wallpaper.jpg">      <h22><h1>   <h>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;purchase&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</h>   </h1></h22>         <p>&nbsp;</p>         <p>&nbsp;</p>         <hr></hr>         <p>&nbsp;</p>         <h22><h1><p1><fieldset>             <form action = "">   <p>     <span>       payment gateway     </span>     <br /><br />     <form> card type:         <select> <option value="" style="display:none">select</option> <option value="one">master card</option> <option value="two">visa card</option> </select>         <p>&nbsp;</p> enter card no:<input type="text" name="cardno" placeholder="0000-0000-0000"><br>         <p>&nbsp;</p> enter pin no:<input type="text" name="pinno" placeholder="000">         <p><sil>(your 3-digit pin can found @ of card)</sil></p>         <p>&nbsp;</p> <input type="submit" value="pay now" onclick="alert('thank you,your order    processed shortly.stay tune..');"> </form>      <br /> <br /></p> </form>             </fieldset></p1></h1></h22>         <p>&nbsp;</p>         <p>&nbsp;</p>         <p>&nbsp;</p>         <p>&nbsp;</p> </body> </html>

you can check value of fields in function call onclick of submit button of form. below function same : 

function validate() {     var cardtype = $("#cardtype");     var cardno = $("#cardno");     var pinno = $("#pinno");      if(cardtype[0].selectedindex == 0 ){         alert('please select card type');         return false;     }     if(cardno.val() == '')     {         alert('please enter card number');         return false;     }     if(pinno.val() == '')     {         alert('please enter pin number');         return false;     }     alert('thank you,your order  processed shortly.stay tune..');     return true; }

i have given id fields. change selector per requirement.
may validate form fields.


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