insert the URL or name of the current domain in a text field

Yes if you want to make your own javascript to insert it.
Here is a sample of how to fill a field, you have to match the field name correctly and figure out how to get the URL for ‘url goes here'(I do not know).

<script type="text/javascript">
document.getElementById('si_contact_ex_field13_1').value='url goes here';
document.getElementById('si_contact_ex_field13_1').readOnly='readOnly';
</script>

But it is already included in the email message you get.
Look at the bottom of the email: “Coming from (referer)” is the URL the form was posted from.

Re,

Thank you for your quick response.
In fact I am not sending emails, I store and for now I’m testing your plugin locally (in my opinion the best today)
At which point, I can put this javascript code on the form?
Hervé
Sorry for my bad English

Re,

Since I want it back automatically, is it would not be possible to recover more value in php :
eg: $ _SERVER [‘HTTP_HOST $]

The javascript can go in the WP page just before the shortcode.

Well it does not work.
I noticed the inversion for the id: si_contact_ex_field1_8

So I put this before the shortcode:

<script type="text/javascript">
document.getElementById('si_contact_ex_field1_8').value='toto.fr';
</script>

HTML rendering of this field is :

<input gtbfieldid="97" style="text-align: left; float: left; padding: 2px; margin: 0pt;" id="si_contact_ex_field1_8" name="si_contact_ex_field8" value="" size="39" type="text">

Do you have a URL I can see?

For the moment no, I work localhost

Hello,

I put the javascript after the form and it works;-)

A+

Hello
It works with a text field but not with a hidden field.
Have you any idea?