[SalesForce] possible to pass selected picklist value to controller via apex:param

Is there any way to pass the current value of a picklist to a controller via apex:param? I have my apex:param inside of a action:support onChange so when the user selects a picklist option it passes that value to the controller method. I'm able to pass the ID with {!$Component.FIELDID} but is there any way to pass the value for example {!$Component.FIELDID.value}? I'm unable to find much documentation on $Component.

I guess the alternative would be to use an actionFunction? I'm going to try that next but wanted to know if this way was possible.

Thanks!

EDIT : snippet (the inputField is a picklist)

<apex:inputField value="{!thisContact.Degree_Level__c}" id="degreeLevel">
                  <apex:actionSupport event="onchange" 
                            action="{!updateDegreeSelected}" 
                            rerender="program"
                            immediate="true">                      
                        <apex:param name="degreeSelected" assignTo="{!degreeSelected}" value="{!$Component.degreeLevel}"/>
                  </apex:actionSupport>
            </apex:inputField>

Best Answer

Unless I'm missing the point of what you're trying to do, the currently selected value is accessible in the field that is bound to your inputField's value attribute.

<apex:actionRegion>
   <apex:inputField value="{!thisContact.Degree_Level__c}" id="degreeLevel">
      <apex:actionSupport event="onchange" 
                            action="{!updateDegreeSelected}" 
                            rerender="program"/>              
   </apex:inputField>
</apex:actionRegion>

EDIT: Removed immediate attribute. Default is false.

So it should be accessible to the controller through thisContact.Degree_Level__c.

So somewhere in your controller you have a property called thisContaact and a method called updateDegreeSelected that look something like this:

public Contact thisContact{get;set;} //here is your contact property
public void updateDegreeSelected(){
//call the thisContact field in here...
    System.debug(thisContact.Degree_Level__c);

}

Related Solutions

[SalesForce] pass actionFunction name of variable to set in controller

Yes, you can use apex:param(s) inside the actionFunction to send values into the controller. The value attribute can be a controller variable as shown in the docs example or set with a javascript call.

Here is something I put in use recently-

<apex:actionFunction name="setTableData" action="{!setTableData}"
        immediate="true" rerender="pgMsgs, matrixTopPanel"
        oncomplete="oTable.fnAddData({!tableData});">
    <apex:param name="sd" assignTo="{!selectedDivision}" value="" />
</apex:actionFunction>

which is called from javascript with setTableData(j$(this).val());

[SalesForce] Visualforce – ActionFunction and ActionSupport not calling action methods

When rerendering an outputpanel, you must rerender a container. Wrap your outputpanels in another outputpanel and use the outer panel when rerendering. Here is an example of an action function that may help you achieve what you're trying to accomplish.

******* VISUALFORCE ******

<apex:page controller="TestLookupActionFunctionCtrl">

<script>

  function myFunc(){
    myAction();    
  }

</script>

<apex:form id="myform">
  <apex:actionFunction name="myAction" action="{!test}" reRender="RerenderMe" />
    <apex:pageBlock >
      <apex:pageBlockSection title="Section 1">

        <!-- Change onKeyup to the event you desire. onChange, onBlur, etc.  -->
        <apex:inputField value="{!c.Department}" onKeyup="myFunc()" />

        <!-- You must rerender a container.  We wrap the conditionally rendered outputPanel in another outputPanel.  Then rerender the outer panel. -->
        <apex:outputpanel id="RerenderMe">

        <!-- Inner panel rendered based on boolean in controller -->
        <apex:outputpanel id="out" rendered="{!show}">
          <apex:outputLabel for="output" value="The Output: ">
            <apex:outputfield value="{!c.department}"/>
          </apex:outputlabel>
        </apex:outputpanel>
        </apex:outputpanel>
      </apex:pageBlockSection>
    </apex:pageBlock>
</apex:form>
</apex:page>

********* CONTROLLER **********

public class TestLookupActionFunctionCtrl {

public Contact c {get;set;}

public boolean show {get;set;}

public TestLookupActionFunctionCtrl() {
    c = new Contact();
    show = false;
}

public PageReference test() {
    show = true;
    return null;
}
}

Best Answer

Related Solutions

[SalesForce] pass actionFunction name of variable to set in controller

[SalesForce] Visualforce – ActionFunction and ActionSupport not calling action methods

Related Topic