Prevent user copy + pasting from one field to next

[emma.sax]

Hi all,

I have a form where we would like the user to input their email address
twice, to ensure they've typed it correctly, as is found on most
sign-ups

I'm looking for a solution to the problem where a user (and me it has
to be said) just either highlights the email address with their mouse
(or Ctrl-A) and then Ctrl-C, Ctrl-P (or right-click copy, right-click
paste) into the next field down.

How would I go about this in JavaScript, or is there another solution?

If it were up to me, I'd use just one box for the email address - but
it isn't, so it has to be done twice.

Thanks

M

[scriptguru]

em******@gmail. com напи�ав:

Hi all,

I have a form where we would like the user to input their email address
twice, to ensure they've typed it correctly, as is found on most
sign-ups

I'm looking for a solution to the problem where a user (and me it has
to be said) just either highlights the email address with their mouse
(or Ctrl-A) and then Ctrl-C, Ctrl-P (or right-click copy, right-click
paste) into the next field down.

How would I go about this in JavaScript, or is there another solution?

If it were up to me, I'd use just one box for the email address - but
it isn't, so it has to be done twice.

Thanks

M

In IE you just need to handle onPaste or/and onCopy event.
In any modern browser you can handle onKeyUp event and if user tries to
push something except alphanumerals and punctuation just return false.

Val

[Dr John Stockton]

JRS: In article <11************ *********@m73g2 000cwd.googlegr oups.com>,
dated Thu, 14 Sep 2006 03:34:11 remote, seen in
news:comp.lang. javascript, em******@gmail. com posted :

>
I have a form where we would like the user to input their email address
twice, to ensure they've typed it correctly, as is found on most
sign-ups

I'm looking for a solution to the problem where a user (and me it has
to be said) just either highlights the email address with their mouse
(or Ctrl-A) and then Ctrl-C, Ctrl-P (or right-click copy, right-click
paste) into the next field down.

How would I go about this in JavaScript, or is there another solution?

It's too late for me to test this tonight, but how about using one of
the onXXXX operations to examine the timing of the entries?

Needs to do both, unless you force entering the first one first.

Even a trained typist cannot type an entry as fast as copy'n'paste
enters it.

Anything in javascript may be defeated by using a forged page; but you
are presumably considering only moderately co-operative clients.

Thought : can onSubmit send a checksum of body innerHTML - probably -
execute document.write( document.body.i nnerHTML) in my js-quick.htm!

It's a good idea to read the newsgroup and its FAQ.
--
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<URL:http://www.jibbering.c om/faq/>? JL/RC: FAQ of news:comp.lang. javascript
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[Randy Webb]

Dr John Stockton said the following on 9/14/2006 6:46 PM:

JRS: In article <11************ *********@m73g2 000cwd.googlegr oups.com>,
dated Thu, 14 Sep 2006 03:34:11 remote, seen in
news:comp.lang. javascript, em******@gmail. com posted :

>I have a form where we would like the user to input their email address
twice, to ensure they've typed it correctly, as is found on most
sign-ups

I'm looking for a solution to the problem where a user (and me it has
to be said) just either highlights the email address with their mouse
(or Ctrl-A) and then Ctrl-C, Ctrl-P (or right-click copy, right-click
paste) into the next field down.

How would I go about this in JavaScript, or is there another solution?

It's too late for me to test this tonight, but how about using one of
the onXXXX operations to examine the timing of the entries?

Needs to do both, unless you force entering the first one first.

Even a trained typist cannot type an entry as fast as copy'n'paste
enters it.

That is very true. But, none of the onXXX can stop this scenario:

javascript:
document.formID .field1Name.val ue="em********* *@somewhere.com ";
document.formID .field2Name.val ue="em********* *@somewhere.com ";
document.formID .submit();

From being executed in the address bar.

--
Randy
Chance Favors The Prepared Mind
comp.lang.javas cript FAQ - http://jibbering.com/faq & newsgroup weekly
Javascript Best Practices - http://www.JavascriptToolbox.com/bestpractices/
Answer:It destroys the order of the conversation
Question: Why?
Answer: Top-Posting.
Question: Whats the most annoying thing on Usenet?

[Evertjan.]

Randy Webb wrote on 15 sep 2006 in comp.lang.javas cript:

That is very true. But, none of the onXXX can stop this scenario:

javascript:
document.formID .field1Name.val ue="em********* *@somewhere.com ";
document.formID .field2Name.val ue="em********* *@somewhere.com ";
document.formID .submit();

From being executed in the address bar.

This one can [prevent the effect]:

<form onsubmit='retur n false'>

--
Evertjan.
The Netherlands.
(Please change the x'es to dots in my emailaddress)

[Randy Webb]

Evertjan. said the following on 9/15/2006 3:14 AM:

Randy Webb wrote on 15 sep 2006 in comp.lang.javas cript:

>That is very true. But, none of the onXXX can stop this scenario:

javascript:
document.formI D.field1Name.va lue="em******** **@somewhere.co m";
document.formI D.field2Name.va lue="em******** **@somewhere.co m";
document.formI D.submit();

From being executed in the address bar.

This one can [prevent the effect]:

<form onsubmit='retur n false'>

You may want to test that a little more. formRef.submit( ) doesn't
trigger the onsubmit event handler:

<form onsubmit="alert ('I got fired');return false" target="_blank" >
<input type="button" onclick="this.f orm.submit()"
value="Submit via Script">
<input type="submit" value="Submit without script">
</form>

--
Randy
Chance Favors The Prepared Mind
comp.lang.javas cript FAQ - http://jibbering.com/faq & newsgroup weekly
Javascript Best Practices - http://www.JavascriptToolbox.com/bestpractices/

[Evertjan.]

Randy Webb wrote on 15 sep 2006 in comp.lang.javas cript:

You may want to test that a little more. formRef.submit( ) doesn't
trigger the onsubmit event handler:

<form onsubmit="alert ('I got fired');return false" target="_blank" >
<input type="button" onclick="this.f orm.submit()"
value="Submit via Script">
<input type="submit" value="Submit without script">
</form>

;-{

You got fired for submitting the truth to me like that, Randy!

--
Evertjan.
The Netherlands.
(Please change the x'es to dots in my emailaddress)

[drclue]

em******@gmail. com wrote:

I have a form where we would like the user to input their email address
twice, to ensure they've typed it correctly, as is found on most
sign-ups

I'm looking for a solution to the problem where a user (and me it has
to be said) just either highlights the email address with their mouse
(or Ctrl-A) and then Ctrl-C, Ctrl-P (or right-click copy, right-click
paste) into the next field down.

How would I go about this in JavaScript, or is there another solution?

If it were up to me, I'd use just one box for the email address - but
it isn't, so it has to be done twice.

Just a thought, but perhaps onfocus you could assign the current length
of the field and setup an onkeyup check for length changes 1
if the change was only but one character you update the stored length
if it's greater than 1 , do your enforcement thing.

[Dr John Stockton]

JRS: In article <Ha************ *************** ***@comcast.com >, dated
Thu, 14 Sep 2006 21:09:12 remote, seen in news:comp.lang. javascript,
Randy Webb <Hi************ @aol.composted :

>Dr John Stockton said the following on 9/14/2006 6:46 PM:

>It's too late for me to test this tonight, but how about using one of
the onXXXX operations to examine the timing of the entries?

Needs to do both, unless you force entering the first one first.

Even a trained typist cannot type an entry as fast as copy'n'paste
enters it.

That is very true. But, none of the onXXX can stop this scenario:

javascript:
document.formI D.field1Name.va lue="em******** **@somewhere.co m";
document.formI D.field2Name.va lue="em******** **@somewhere.co m";
document.formI D.submit();

From being executed in the address bar.

Granted; and one could probably edit the page locally to circumvent any
checks.

But the OP seems to be trying to inhibit naive users from not benefiting
from the double-typed input check - and your code does have double
input.

javascript: with (document.formI D) {
field1Name.valu e = field2Name.valu e = "em**********@s omewhere.com" ;
submit() }

(untested) seems a more efficient cheat.

But the OP only needs to have a hidden field containing the results of
the timing tests ...

>--
Randy
Chance Favors The Prepared Mind
comp.lang.java script FAQ - http://jibbering.com/faq & newsgroup weekly
Javascript Best Practices - http://www.JavascriptToolbox.com/bestpractices/
Answer:It destroys the order of the conversation
Question: Why?
Answer: Top-Posting.
Question: Whats the most annoying thing on Usenet?

Oversize sigs used to be - they seem to be coming back here.

--
© John Stockton, Surrey, UK. ??*@merlyn.demo n.co.uk Turnpike v4.00 MIME ©
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