Do I need javascript to pre-populate a form field?

08-24-06, 08:35 AM

Richard Rosser

Greetings.
I know not one word of Javascript and wondered if there was
an easy way to pre-populate a form field in a similar manner to
populating an eMail 'subject' field? -
The following populates the subject field in an eMail:
a href="mailto:me?subject=USER ID 12345

How can I populate the first field of a form (or can I?) with the
same information - i.e. the USER ID located on the HTML page
calling the form?

Any help appreciated

08-24-06, 10:27 AM

Laurent Bugnion

Hi,

Richard Rosser wrote:
> Greetings.
> I know not one word of Javascript and wondered if there was
> an easy way to pre-populate a form field in a similar manner to
> populating an eMail 'subject' field? -
> The following populates the subject field in an eMail:
> a href="mailto:me?subject=USER ID 12345

This is not standard, and you have no guarantee that it will work
correctly...

> How can I populate the first field of a form (or can I?) with the
> same information - i.e. the USER ID located on the HTML page
> calling the form?
>
> Any help appreciated

Using HTML:

<input type="text" id="tfUserId" name="tfUserId" value="USERID" />

Using javascript:

document.getElementById( "tfUserId" ).value = "USERID";

This code will throw an error if tfUserId doesn't exist, so a better
code would be:

if ( document.getElementById ) // This checks if the feature exists
{
var nField = document.getElementById( "tfUserId" );
if ( nField != null
&& nField.value != null )
{
nField.value = "USERID";
}
else
{
// No such field, handle error
}
}
else
{
// Browser doesn't support document.getElementById
}

HTH,
Laurent

08-24-06, 11:39 AM

Richard Cornford

Laurent Bugnion wrote:
<snip>
> Using HTML:
>
> <input type="text" id="tfUserId" name="tfUserId" value="USERID" />
^

If this is HTML what is that slash doing at the end of the INPUT tag?

Richard.

08-24-06, 12:39 PM

Tom Cole

Richard Cornford wrote:
> Laurent Bugnion wrote:
> <snip>
> > Using HTML:
> >
> > <input type="text" id="tfUserId" name="tfUserId" value="USERID" />
> ^
>
> If this is HTML what is that slash doing at the end of the INPUT tag?

Stop it. You're going to confuse the newbies.

08-24-06, 01:02 PM

Richard Cornford

Tom Cole wrote:
> Richard Cornford wrote:
>> Laurent Bugnion wrote:
>> <snip>
>>> Using HTML:
>>>
>>> <input type="text" id="tfUserId" name="tfUserId" value="USERID" />
>> ^
>>
>> If this is HTML what is that slash doing at the end of the INPUT tag?
>
> Stop it. You're going to confuse the newbies.

I am not the one posting XHTML mark-up and labelling it HTML.

Richard.

08-24-06, 01:07 PM

Laurent Bugnion

Hi,

Richard Cornford wrote:
> Laurent Bugnion wrote:
> <snip>
>> Using HTML:
>>
>> <input type="text" id="tfUserId" name="tfUserId" value="USERID" />
> ^
>
> If this is HTML what is that slash doing at the end of the INPUT tag?
>
> Richard.

Do you eat a validator for breakfast every morning? ;-)

Laurent

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