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Editorial Team
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Asked: 2026-05-26T16:47:57+00:00

Hello i have a JSP page that contain a form, i want to validate

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Hello i have a JSP page that contain a form, i want to validate the form data like date of birth format and value, breed id – zoo id that are numbers only and animals name that exist

here is my JSP page:

<%@taglib prefix="c" uri="http://java.sun.com/jsp/jstl/core" %> 
<%@ page import="java.util.ArrayList" %>
<%@page import="content.*"%>
<%@ page language="java" 
         contentType="text/html; charset=windows-1256"
         pageEncoding="windows-1256" %>


<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"
"http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>



<meta http-equiv="Content-Type" content="text/html; charset=windows-1256">
<title>Append Animal</title>
<link rel="stylesheet"
      href="./css/styles.css"
      type="text/css"/>
</head>
<body>
<table class="title">
  <tr><th>Zoo keeper</th></tr>
</table>


<h1>Append Animal</h1>

<form name="insert" action="Relay" >
<fieldset>
Animal new name: <input type= "text" name = "aname"><br>
Animal new DOB: <input type= "text" name = "dob"><br>


Animal new gender: 
<select name="gender" id="gender">
<option value="male">Male</option>
<option value="female">Female</option>
</select>
<br>
Animal status: 
<select name="source" id="source">
<option value="born">Born</option>
<option value="bought">Bought</option>
</select>
<br>
Animal old zoo: <input type= "text" name = "zooid" > only if bought<br>
Animal new Breed: <input type= "text" name = "breedid" ><br>
Animal new remarks: <textarea name = "remark" rows="4" cols="20">

</textarea> <br /> <br/>


<input type="submit" value="submit">

<input type="hidden" name="command" value="AppendAnimalServlet" > 

</fieldset>
</form>
</body></html>

i added this script in JSP page: 

<script>
function validateForm()
{
    if(document.insert.aname.value ==="")
    {
      alert("Animal should have a name");
      document.insert.aname.focus();
      return false;
    }
    if(document.insert.zooid.value !=="")
    {
        if (! (/^\d*(?:\.\d{0,2})?$/.test(document.insert.zooid.value))) { 
            alert("Please enter a valid Zoo id"); 
            document.insert.zooid.focus(); 
            return false; 
        } 

      } 
    if(document.insert.breedid.value !=="")
    {
        if (! (/^\d*(?:\.\d{0,2})?$/.test(document.insert.breedid.value))) { 
            alert("Please enter a valid Breed id"); 
            document.insert.breedid.focus(); 
            return false; 
        } 

      } 
    if(document.insert.dob.value ==="")
    {
      alert("Animal should have a date of birth");
      document.insert.aname.focus();
      return false;
    }

}
</script>

but i don’t think i’m doing this right any suggestion on how to deal with this ?

and please note that the form values will be transfared to a Relay servlet to handle the insert process

<form name="insert" action="Relay" onsubmit="return validateForm();">
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1 Answer

  1. Editorial Team

    A validation library can be built using some generic code like the following (just a quick example, it can be extended greatly):

    function validate(form) {
  var fnMap = {

    'validate-dateISO8601': {
      checkFn: isValidISO8601,
      checkMsg: 'Date must be in format yyyy-mm-dd'
    },

    'validate-dateValid': {
      checkFn: isValidDate,
      checkMsg: 'Date must be a valid date'
    }
  };

  var reClass = /(^|\s*)validate-[^\s]*/g;
  var control, controls = form.elements;
  var check, checks;
  var fn, value;

  for (var i=0, iLen=controls.length; i<iLen; i++) {
    control = controls[i];

    // Need a function here to handle more control types
    value = control.value;
    checks = control.className.match(reClass);

    // If there are any validate- classes
    if (checks) {

      // For each validate class
      for (var j=0, jLen=checks.length; j<jLen; j++) {
        check = checks[j].replace(/\s/g,'');

        // See if there is a related function
        if (fnMap.hasOwnProperty(check)) {
          check = fnMap[check];

          // If there is, run it
          // If it fails, show the message
          // This part could be collected in an array and all the
          // error messages desplayed at once or in suitable message
          // elements in the document. But alert is cheap :-)
          if (!check.checkFn(value)) {
            alert(check.checkMsg);
            control.focus();
            return false;
          }
        }
      }
    }
  }
}

// Just checks the pattern is yyyy/mm/dd
function isValidISO8601(s) {
    s.replace(/^\s+|\s+$/g, '');
    return /\d{4}[-\/]\d{2}[-\/]\d{2}/.test(s);
} 

// Checks that s is a valid date
function isValidDate(s) {
    var bits = s.split(/[-\/]/g);
    var d = new Date(bits[0], bits[1] - 1, bits[2]);
    return d.getFullYear() == bits[0] && d.getDate() == bits[2];
}

</script>

    And some HTML

    <form onsubmit="return validate(this);">
  <input type="text" name="foo" class="validate-dateISO8601 validate-dateValid" value="2011-02-28">
  <input type="submit">
</form>
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