Dear Mike:
Within your Javascript, try to find your drop down by Id or Name. I think
the statement looks something like:
mySelectBox = document.findElementById("yourIdHere")
or
mySelectBox = document.findElementByName("yourIdHere")
Hope that helps!
Wiwit Tjahjana
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10/06/2004 03:22 PM
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Subject
Modifying an object within the form bean?
I have a situation where the form bean contains objects inside it
which represent sets of things which will appear in an <html:select>
tag. In particular, the objects have three properties:
selected_ndx
ndx_set
label_set
One of these objects is the 'moderator' property of the form bean.
The overall design intent was to have an object which could provide
the values and labels for an <html:select> statement and have
selected_ndx be the value which is changed via the selection process
in the web page.
If I write the JSP like this, it works:
<html:select property="moderator.selected_ndx">
<html:options property="moderator.ndx_set"
labelProperty="moderator.label_set"/>
</html:select>
This generates the following HTML:
<select name="moderator.selected_ndx"><option value="0"></option>
<option value="1">First Selection</option>
<option value="2">Second Selection</option>
<option value="3">Third Selection</option></select>
This successfully displays the selected entity and allows it to be
changed via selection through the web page.
However, additionally I need to be able to set the value of this
select from a popup window. That generally means I need to specify
the form element as the target of a javascript assignment. What has
worked in similar circumstances in the past is something like
opener.document.formBean.selectElementName = newValue
where selectElementName is the value of the 'name' attribute from the
select element. Here that name is "moderator.selected_ndx". That
causes a problem. When the javascript runs (from a popup window) the
following javascript error occurs:
Error: opener.document.formBean.moderator has no properties
Which I interpret as the javascript interpreter being able to find the
formBean property (which I assume is being furnished by the
<html:form> tag) but that there is no attribute of that called
"moderator". If I didn't use the dotted notation in the <html:select>
tag, the correct attribute gets created, or whatever, and the
javascript works OK.
So -- how can I solve this problem? Assuming that the naming is the
problem, I've tried introducing a bean like this:
<bean:define id="mod" name="formBean" property="moderator"/>
<html:select name="mod" property="selected_ndx">
<html:options name="mod" property="ndx_set"
labelName="mod" labelProperty="label_set"/>
</html:select>
Which generates HTML:
<select name="selected_ndx"><option value="0"></option>
etc.
But that causes the select element to be unselectable; that is, while
the getter method (getSelected_ndx()) gets invoked, the setter method
(setSelected_ndx()) does not, so that changes to the field no longer
get propagated back to the form bean. Even if I could get this to
work, I'm dubious that I could have multiple select elements working
properly in the same form since they would all have the same name
attribute (selected_ndx).
While I'm unconvinced that the failure to invoke the setter method
isn't a bug, I still need to solve the problem through some
combination of Struts/JavaScript.
Any suggestions?
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