Small Dropdown problem in Jdeveloper

Question

hi, i am using Jdeveloper 10.1.2.1.0. i have dropdown containing few fields and when i try to run the jsp page the first field in the dropdown is automatically get selected and i want some thing like, unless i select the dropdown and click on what i needed it should not take or consider any field in my query. can any one help me to find the solution for this.
this is the source code in JSP for my dropdown.
<tr>
<td>
<c:out value="${bindings['AssetGroup'].label}"/>
</td>
<td>
<html:select property="AssetGroup1">
<html:optionsCollection label="prompt" value="index" property="AssetGroup1.displayData"/>
</html:select>
</td>
</tr>
regards
Nag

Answer 1

This is happening because there is a default value set for the drop down list.
A good start for you is to look through some standard html form examples of using drop down lists to get a good understanding of how they function. Then apply this knowledge to the ADF/JSP example that you have.
Also look in the properties panel (usually lower right hand corner of JDeveloper) when you have selected the drop down list in question and you should see one called VALUE. This is the default value that is being set in your drop down, you should be able to edit it from here as well as via the code.
As for catching the fact that a user has not selected something from the drop down or indeed not completed the form as you would like them to prior to submitting, I'm presuming that you are using ADF - you need to add a data action and over ride the validate function for the form.
For example:
if your form just requires the user to enter a username and password, and presently has a start.jsp page that forwards to a main.jsp page. You need to add a data action (and for example call it validate) between the two (i.e. start --> validate --> main). Then set the property of the validate data action to carry out validation, and then in the java bean that holds the data for the form (i.e. username and password) extend the data action method and write a validate method as appropriate, in this case ensuring that a username and password have been entered. This method will then through actionErrors that can be displayed on the login page if they are indeed caught.
This is a bit tricky to explain, if I remember correctly the toy store example demonstrates this functionality.
Hope this is of some help to you
David