[Javascript] Dynamically create & populate a hidden form field...

Wed Jul 31 16:20:36 CDT 2002

Chris,

That's my thought too. I've done something similar by always including a
hidden field for additional arguments that the server needs and just
appending [name,key] pairs and parsing everything out server-side. This way
you can have any number of unknown elements and forms on the page add data
with little additional overhead on the querystring (with the implicit
assumption that no entry equates to NULL).

--Josiah Gordon

-----Original Message-----
From: javascript-admin at LaTech.edu [mailto:javascript-admin at LaTech.edu]On
Behalf Of Rodney Myers
Sent: Wednesday, July 31, 2002 2:09 PM
To: javascript at LaTech.edu
Subject: Re: [Javascript] Dynamically create & populate a hidden form
field...

Chris,

I don't know about creating fields on the fly, and ina nexisitng form -
though I
do it all the time by wrting a complete form in another frame.

But if you put all the hidden fields in (and I take it you will have many
selects) :

function GetSBText(eRef) {
var  temp = eRef.options[eRef.selectedIndex].text;
var form=eRef.form;
form.elements[eRef.name+'Text'].value = temp;
}

Alternatively, put the select names and data into an array of objects then
onSubmit run these off
EITHER into building a form in another frame
OR creating a delimited string which you can split and parse in ASP after
assigning it to one hidden field.

hth

Rodney

Chris Nafziger wrote:

> Question (regarding code at bottom):  How can I modify the GetSBText
> function, so that I can omit the hidden field definition in the html?  I
> want to omit this line:  <input name="SBoxText" type="hidden">
>
> Goal:  In addition to what the function already does, I want it to use the
> reference to take the name of the element ('SBox' in this case), always
> concatenate 'Text' to the name ('SBoxText'), and create & populate a
hidden
> form field with that name. If a selects something, changes their mind and
> selects something else, then it shouldn't attempt to recreate the field,
but
> rather, only populate it.
>
> Reason:  The reason I'm wanting to do this, is so the actual text selected
> is also available in the (ASP) Request object on the page it's posting to.
> The reason I chose to use the <select> onchange event rather than the
<form>
> onsubmit event, is because I felt it would be easier to get a truly
generic
> function, that could be used for any <select>, or multiple "<select>s" on
a
> form by simply putting 'onchange="GetSBText(this); return true;"' on each
> select.  The reason behind that is because I'm really passing a recordset
to
> a VBScript function that creates the html, as well, so if I want the
> "<option>'s" displayed value to be in the next page's request object, I
can
> simply trigger it on/off by setting a boolean parm to the VBScript
function,
> so it knows whether to include 'onchange="GetSBText(this); return true;"'
> in the html or not.
>
> Again, my question is:  How can I modify the GetSBText function, so that I
> can omit the hidden field definition in the html?
>
> <html>
> <head>
> <script LANGUAGE="JavaScript">
> <!--
> function GetSBText(eRef) {
>   //
>   temp = eRef.options[eRef.selectedIndex].text;
>   document.all['SBoxText'].value = temp;
> }
> -->
> </script>
> </head>
> <body>
> <br><br>
> <form action="Whatever.asp" method="post">
>   <select name="SBox" onchange="GetSBText(this); return true;">
>     <option value="1">One</option>
>     <option value="2">Two</option>
>     <option value="3">Three</option>
>   </select>
>   <br><br>
>   <input name="SBoxText" type="hidden">
>   <input type="submit" value="Go!">
> </form>
> </body>
> </html>
> _______________________________________________
> Javascript mailing list
> Javascript at LaTech.edu
> https://lists.LaTech.edu/mailman/listinfo/javascript

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