Is It Possible to Invoke An Action By Selecting an Option from a Drop-Down Menu?

[JiaPei Jen]

We can invoke actions by clicking on a Submit button or by clicking on a link. Is it possible to invoke an action by selecting an option from a drop-down menu? If the answer is "yes", how do we do it?

[Jeanne Boyarsky]

JiaPei,
Yes, but you need to use Javascript too. If there is a different action depending on the value, you need to set that action. Regardless, use javascript to submit the form

<script>
function myFunction() {
  document.form.action='action';
  document.form.submit();
}
</script>
 
<html:select id="pullDown" blur="myFunction()" ...

(blur should be onBlur), but it's not letting me post that.

[Kunal Bhattacharya]

I am facing the same error.
When I try starting tomcat. I get the following error -

Sep 8, 2006 2:37:59 PM org.apache.catalina.core.StandardContext loadOnStartup
SEVERE: Servlet /ch03app threw load() exception
javax.servlet.UnavailableException: Parsing error processing resource path /WEB-INF/struts-config.xml

Here is the entry in struts-config.xml

<action-mappings>
<action path="/Lookup"
type="ch03.LookupAction"
name="LookupForm" />
<forward name="success" path="/quote.jsp" />
<forward name="failure" path="/index.jsp" />
</action>
</action-mappings>


Can someone help me on this?

[Purushoth Thambu]

OnBlur is fired even when the option is not changed. I believe the better way is to use OnChanged and OnBlur together. Something like below

<script>
 var _changed=false;
 function onChangedSelection()
 {
   _changed=true;
 }
 
 function submitChange(form)
 {
   alert(form.action);
   if(_changed)
form.submit();
 }
</script>
 

and make the selection control like

<select name="change1" on blur="submitChange(this.form);" on change="onChangedSelection();">