js_form_validation.asp

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{
if (value==null||value=="")
  {alert(alerttxt);return false;}
else {return true}
}
}</pre>
<pre>function validate_form(thisform)
{
with (thisform)
{
if (validate_required(email,&quot;Email must be filled out!&quot;)==false)
  {email.focus();return false;}
}
}
&lt;/script&gt;
&lt;/head&gt;</pre>
<pre>&lt;body&gt;
&lt;form action=&quot;submitpage.htm&quot;
onsubmit=&quot;return validate_form(this)&quot;
method=&quot;post&quot;&gt;
Email: &lt;input type=&quot;text&quot; name=&quot;email&quot; size=&quot;30&quot;&gt;
&lt;input type=&quot;submit&quot; value=&quot;Submit&quot;&gt; 
&lt;/form&gt;
&lt;/body&gt;</pre>
<pre>&lt;/html&gt;</pre>
</td></tr></table>
<br />
<hr />

<h2>E-mail Validation</h2>
<p>The function below checks if the content has the general syntax of an email.</p>
<p>This means that the input data must contain at least an @ sign and a dot (.). 
Also, the @ must not be the first character of the email address, and the last 
dot must at least be one character after the @ sign:</p>
<table class="ex" cellspacing="0" border="1" width="100%" id="table1"><tr><td>
<pre>function validate_email(field,alerttxt)
{
with (field)
{
apos=value.indexOf(&quot;@&quot;);
dotpos=value.lastIndexOf(&quot;.&quot;);
if (apos&lt;1||dotpos-apos&lt;2) 
  {alert(alerttxt);return false;}
else {return true;}
}
}</pre>
</td></tr></table>
<p>The entire script, with the HTML form could look something like this:</p>
<table class="ex" cellspacing="0" border="1" width="100%" id="table2"><tr><td>
<pre>&lt;html&gt;
&lt;head&gt;
&lt;script type=&quot;text/javascript&quot;&gt;
function validate_email(field,alerttxt)
{
with (field)
{
apos=value.indexOf(&quot;@&quot;);
dotpos=value.lastIndexOf(&quot;.&quot;);
if (apos&lt;1||dotpos-apos&lt;2) 
  {alert(alerttxt);return false;}
else {return true;}
}
}</pre>
<pre>function validate_form(thisform)
{
with (thisform)
{
if (validate_email(email,&quot;Not a valid e-mail address!&quot;)==false)
  {email.focus();return false;}
}
}
&lt;/script&gt;
&lt;/head&gt;</pre>
<pre>&lt;body&gt;
&lt;form action=&quot;submitpage.htm&quot;
onsubmit=&quot;return validate_form(this);&quot;
method=&quot;post&quot;&gt;
Email: &lt;input type=&quot;text&quot; name=&quot;email&quot; size=&quot;30&quot;&gt;
&lt;input type=&quot;submit&quot; value=&quot;Submit&quot;&gt; 
&lt;/form&gt;
&lt;/body&gt;</pre>
<pre>&lt;/html&gt;</pre>
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