Remove the null values in a multi-value listbox

Rin

Hi,<br />
<br />
Each time I create a parameter with multi-value checked and is-required unchecked, and make its display type as listbox, the first value in the listbox will always be a blank, and the second value is always be "Null Value" , (both static or dynamic parameter),I have tried a lot of different ways to remove it but none of them works.<br />
<br />
I modified ComboBoxParameterFragment.jsp in webapps\birt\webcontent\birt\pages\parameter, replace the IBirtConstants.NULL_VALUE in line 143, and IBirtConstants.NULL_VALUE_DISPLAY in line 144 with "123":<br />
<br />
<strong class='bbc'>String outputValue = ParameterAccessor.htmlEncode(( value == null)?"123":value);<br />
String outputLabel = ParameterAccessor.htmlEncode(( label == null)?"123":label);<br />
</strong><br />
then run the report again, the blank and null value is still there....<br />
<br />
Then I do sth like:<br />
<strong class='bbc'>String outputValue = ParameterAccessor.htmlEncode(( value == null)?IBirtConstants.NULL_VALUE:value);<br />
String outputLabel = ParameterAccessor.htmlEncode(( label == null)?"123":"123");</strong><br />
<br />
This time all the values in the list box became display as "123", but the blank line and "Null Value" are still there, in the first and second line of the parameter list box!<br />
<br />
<br />
An interesting thing is: when I check the is-required, the blank and null-value will all gone...<br />
<br />
I'm using birt-runtime-2_6_2, and same problem with 3.7

mwilliams

The "null value" is there when it's not required so that there is an option for passing a null value. It's just the way the sample viewer handles it. Is using a "required" parameter not an option? You could include a default of "No Value" or something like that. This way there is something selected to pass whether the user selects something or not. Another option if you aren't able to edit the parameter jsp pages to remove the null option would be to create your own parameter page using the viewer taglib.