>What is the benefit of the hidden frame?
Just allows you to do things "behind the scenes" so you avoid the
frustrating UI page reload
cheers,
David
|---------+---------------------------->
| | Bill Siggelkow |
| | <[EMAIL PROTECTED]|
| | th.net> |
| | Sent by: news |
| | <[EMAIL PROTECTED]|
| | rg> |
| | |
| | |
| | 09/02/2004 02:05 |
| | PM |
| | Please respond to|
| | "Struts Users |
| | Mailing List" |
| | |
|---------+---------------------------->
>------------------------------------------------------------------------------------------------------------------------|
|
|
| To: [EMAIL PROTECTED]
|
| cc:
|
| Subject: Re: dynamically change the dropdown list from a database...
|
>------------------------------------------------------------------------------------------------------------------------|
What is the benefit of the hidden frame? I guess that you can submit an
entire form ... however, most of the time I only need to drop an ID as a
request parameter. I dynamically populate select lists like this:
Use an onchange or onclick JavaScript listener to call a JavaScript
function that submits the form to a Struts Action. In the Action,
perform the necessary business logic to construct a new collection for
the select options, then forward control back to the original JSP page.
Example 3-11 shows a JSP page that submits the form to an Action when
the user clicks a radio button. The value of the radio button is passed
to the Action as a request parameter.
Example 3-11. Submitting a form using JavaScript
<%@ page contentType="text/html;charset=UTF-8" language="java" %>
<%@ taglib uri="/WEB-INF/struts-bean.tld" prefix="bean" %>
<%@ taglib uri="/WEB-INF/struts-html.tld" prefix="html" %>
<html>
<head>
<title>Struts ? JavaScript Example</title>
<script language="JavaScript">
function getOptions(control) {
form = control.form;
form.action = "SetOptions.do?someProp=";
form.action += control.value;
form.submit();
}
</script>
</head>
<body>
<html:form action="ProcessMyForm">
<html:radio property="someProp1" value="val1"
onclick="getOptions(this);"/> Value 1<br/>
<html:radio property="language" value="val2"
onclick="getOptions(this);"/> Value 2<br/>
SomeProp2:
<html:select property="someProp2">
<html:optionsCollection property="prop2Values"/>
</html:select>
</p>
<html:submit/>
</html:form>
</body>
</html>
Bill Siggelkow
[EMAIL PROTECTED] wrote:
> Don't have any code handy, but it's quite straightforward:
>
> - create a hidden frame
> - on the select's onchange() do a submit on a form in the hidden frame to
> an action that gets the information from the database, passing in the
> relevant parameter
> - have the action forward to a jsp which is just a javascript call to
> update the other select box - probably easiest just to delete the select
> box options, iterate through the through the collection returned and for
> each one create a javascript call on the other frame that adds an option
> for it
>
> let me know if you have any qu's.
>
> cheers,
>
> David
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