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Very Simple email validation onchange?

Posted on 2004-10-14
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Last Modified: 2012-08-13
I need a very simple email validation script (so simple I can't do it :-( ). can u help?
I have this input field:

<input name="register_email" type="text" size="30" maxlength="50" onblur="this.value=this.value.replace(/ /g,'_')" onfocus="change2Msg(2);" value="<cfif isdefined('url.em')><cfoutput>#url.em#</cfoutput></cfif>">

I need to FORCE the user to stay in the input field if no '@' or '.' is part of the entered string.  I'm sure this is goofy but it would help me with a very simple task I need.

Does this make sense?

In otherwords ... when I tab (or click) into this text field 'register_email' and I fail to enter a text string that contains an '@' and an '.' (i.e. fred instead of 'fred@fred.com') then when I leave the field ... force the user BACK into the text input field.

(i need to keep that onfocus="change2Msg(2);" code in my line and the coldfusion output field for value.)


Thanks for any help!
Richard
0
Comment
Question by:rcbuchanan
2 Comments
 
LVL 4

Assisted Solution

by:reginab
reginab earned 100 total points
ID: 12310731
well this is the simplest way
function isValidEmail(str) {
   return (str.indexOf(".") > 2) && (str.indexOf("@") > 0);
 
}

then just focus back to the input field

here is a little more detail from javascriptsource.com
should get you started.


<!-- TWO STEPS TO INSTALL FORM VALIDATION:

   1.  Paste the first coding into the HEAD of your HTML document
   2.  Put the last code into the BODY of your HTML document  -->

<!-- STEP ONE: Copy this code into the HEAD your HTML document  -->
             
<HEAD>

<SCRIPT LANGUAGE="JavaScript">

<!-- This script and many more are available free online at -->
<!-- The JavaScript Source!! http://javascript.internet.com -->

<!-- Begin
function getCookie(name){
var cname = name + "=";              
var dc = document.cookie;            
if (dc.length > 0) {              
begin = dc.indexOf(cname);      
if (begin != -1) {          
begin += cname.length;      
end = dc.indexOf(";", begin);
if (end == -1) end = dc.length;
return unescape(dc.substring(begin, end));
}
}
return null;
}
function setCookie(name, value) {
var now = new Date();
var then = new Date(now.getTime() + 31536000000);
document.cookie = name + "=" + escape(value) + "; expires=" + then.toGMTString() + "; path=/";
}
function getInfo(form) {
form.info.value = "Browser Information: " + navigator.userAgent;
}
function getValue(element) {
var value = getCookie(element.name);
if (value != null) element.value = value;
}
function setValue(element) {
setCookie(element.name, element.value);
}
function fixElement(element, message) {
alert(message);
element.focus();
}
function isMailReady(form) {
var passed = false;
if (form.fullname.value == "") {
fixElement(form.fullname, "Please include your name.");
}
else if (form.email.value.indexOf("@") == -1 ||
form.email.value.indexOf(".") == -1) {
fixElement(form.email, "Please include a proper email address.");
}
else if (form.message.value == "") {
fixElement(form.message, "Please include a message.");
}
else {
getInfo(form);
passed = true;
}
return passed;
}
// End -->
</SCRIPT>

<!-- STEP TWO: Copy this code into the BODY of your HTML document  -->

<BODY>

<CENTER>
<FORM NAME = "mail" ACTION = "mailto:youremailaddress.com" METHOD = "POST" ENCTYPE = "text/plain" onSubmit = "return isMailReady(this);">
<INPUT TYPE = "hidden" NAME = "info">
<TABLE BORDER = 0 CELLPADDING = 5 CELLSPACING = 0>
<TR>
<TD>
Your Name:
<P>
<INPUT TYPE = "TEXT" NAME = "fullname" onFocus = "getValue(this)" onBlur = "setValue(this)">
</TD>
<TD>
Your Email Address:
<P>
<INPUT TYPE = "TEXT" NAME = "email" onFocus = "getValue(this)" onBlur = "setValue(this)">
</TD>
</TR>
<TR>
<TD COLSPAN = "2">
Enter your Message:
<P>
<TEXTAREA ROWS = "8" COLS = "38" NAME = "message">
</TEXTAREA>
</TD>
</TR>
<TR>
<TD COLSPAN = "2">
<INPUT TYPE = "SUBMIT" VALUE = " Submit ">
<INPUT TYPE = "RESET" VALUE = " Cancel ">
</TD>
</TR>
</TABLE>
</FORM>
</CENTER>

<p><center>
<font face="arial, helvetica" size="-2">Free JavaScripts provided<br>
by <a href="http://javascriptsource.com">The JavaScript Source</a></font>
</center><p>

0
 
LVL 3

Accepted Solution

by:
Kupi earned 400 total points
ID: 12310990
What about this?

<input name="register_email" type="text" size="30" maxlength="50" onblur="if (!(/^([\w-\.]+)@((\[[0-9]{1,3}\.[0-9]{1,3}\.[0-9]{1,3}\.)|(([\w-]+\.)+))([a-zA-Z]{2,4}|[0-9]{1,3})(\]?)$/).test(this.value)) this.focus();">

This regular expression will validate the e-mail address and focus back the field if not correct.

Kupi
0

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