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Jul 4th, 2010

php comment form with javascript to check null values

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Hi, first of all sorry if this has come up before, but I couldn't find it anywhere.

I have a working php form which submits data on submit. I need to verify the input fields to ensure they are not empty. I know i need a javascript function to run this check.

I am just having problems running the javascript before the form is submitted.

Any helps would be grand.

Javascript code:

PHP Syntax (Toggle Plain Text)
<script language="JavaScript" type="text/javascript">
<!--
function verify ( form )
{
  if (form.email.value == "") {
    alert( "Please enter your email address." );
    return false ;
  }
else {
      return true ;
     }
}
//-->
</script>
<script language="JavaScript" type="text/javascript">
<!--
function verify ( form )
{
  if (form.email.value == "") {
    alert( "Please enter your email address." );
    return false ;
  }
else {
      return true ;
     }
}
//-->
</script>

Here is some of the code, with one of the required fields, email.

PHP Syntax (Toggle Plain Text)
<form method="post" name="Comment Form" action="PHP/comment.php" target="_self">
 
<table border="0" name="pageid" id="commentform">
 
<tr>
    <td><div align="right">Email: (Required)</div></td>
    <td><input type="text" name="email" size="30" /></td>
</tr>
 
<tr>
<td>&nbsp;</td>
    <td>
    <input type="submit" name="submit" value="Submit" /> 
    <input type="reset" name="reset" value="Reset" />
    </td>
</tr>
 
</table>
</form>
<form method="post" name="Comment Form" action="PHP/comment.php" target="_self">

<table border="0" name="pageid" id="commentform">

<tr>
    <td><div align="right">Email: (Required)</div></td>
    <td><input type="text" name="email" size="30" /></td>
</tr>

<tr>
<td>&nbsp;</td>
    <td>
    <input type="submit" name="submit" value="Submit" /> 
    <input type="reset" name="reset" value="Reset" />
    </td>
</tr>

</table>
</form>

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ptemedia

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Jul 4th, 2010

Re: php comment form with javascript to check null values

Below i modified your script and now it check for null value.

PHP Syntax (Toggle Plain Text)
<html>
<head>
<script language="JavaScript" type="text/javascript">
function verify ( form )
{
  if (form.email.value == "") {
    alert( "Please enter your email address." );
    return false ;
  }
else {
      return true ;
     }
}
 
</script>
</head>
<body>
 
<form method="post" name="Comment Form" action="PHP/comment.php" target="_self" onsubmit="return verify(this)">
 
<table border="0" name="pageid" id="commentform">
 
<tr>
    <td><div align="right">Email: (Required)</div></td>
    <td><input type="text" name="email" size="30" /></td>
</tr>
 
<tr>
<td>&nbsp;</td>
    <td>
    <input type="submit" name="submit" value="Submit" /> 
    <input type="reset" name="reset" value="Reset" />
    </td>
</tr>
 
</table>
</form>
</body>
</html>
<html>
<head>
<script language="JavaScript" type="text/javascript">
function verify ( form )
{
  if (form.email.value == "") {
    alert( "Please enter your email address." );
    return false ;
  }
else {
      return true ;
     }
}

</script>
</head>
<body>

<form method="post" name="Comment Form" action="PHP/comment.php" target="_self" onsubmit="return verify(this)">
 
<table border="0" name="pageid" id="commentform">
 
<tr>
    <td><div align="right">Email: (Required)</div></td>
    <td><input type="text" name="email" size="30" /></td>
</tr>
 
<tr>
<td>&nbsp;</td>
    <td>
    <input type="submit" name="submit" value="Submit" /> 
    <input type="reset" name="reset" value="Reset" />
    </td>
</tr>
 
</table>
</form>
</body>
</html>

You have to call verify function on onSubmit event of form.

You can also use php validation for null value checking and email validation.

-keval

keval_hack

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Jul 4th, 2010

Re: php comment form with javascript to check null values

I have done this, but it is still posting blank data. I'm not sure how, but the php script is still running first and the javascript is being ignored

ptemedia

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Jul 5th, 2010

Re: php comment form with javascript to check null values

First you check your browser support javascript or it is enable in browser settings.

You make simple javascript function that display alert for checking javascript is working and call function on button' s onClick event.

-keval

keval_hack

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Jul 5th, 2010

Re: php comment form with javascript to check null values

The code given by keval_hack working perfectly.

rajarajan07

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since May 2008

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Jul 5th, 2010

Re: php comment form with javascript to check null values

Yeah, sorry guys, I'd made a stupid mistake (typo

).

It does work fine! Thanks

ptemedia

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