I have a page with a form. My question is, if when I rerender a part of the form, its input values can simply be populated by '' or null.

                <apex:pageBlockSection id="generalInfo" columns="2">
                   <apex:inputField label="Name" value="{!newName}" required="true"/>
                   <apex:inputField label="Date" value="{!newDate}" onfocus="DatePicker.pickDate(false, this , false);" required="true" }
           <apex:pageBlockSection id="placeType" title="Additional Information" columns="2">
                    <apex:pageBlockSectionItem >
                    <apex:outputLabel for="place">Place</apex:outputLabel>  
                    <apex:actionRegion >
                        <apex:selectRadio value="{!place}" id="place">                           
                            <apex:selectOptions value="{!items}"/>                            
                            <apex:actionSupport event="onchange" rerender="placeType" status="status"/>                           
                    <apex:inputField label="The type" value="{!newType}" required="true"/>

The problem is, the !newType field is populated before the page is rendered... It's like if I only need for the page to fetch this value the first time, when it renders, and then ignore it's previous value and render as blank.

Best regards.

  • I don't really understand what you are asking here.
    – dphil
    Commented Feb 14, 2014 at 15:07
  • Edited the question.
    – Rui Rocha
    Commented Feb 14, 2014 at 15:16
  • Ok, so are you saying that when you rerender that field, you want it to automatically become blank?
    – dphil
    Commented Feb 14, 2014 at 15:21
  • Yes. The first time, it appears the value it had. On rerender, always be blank.
    – Rui Rocha
    Commented Feb 14, 2014 at 15:23

1 Answer 1


Assuming that you want 'anytime the field containing {!newType} is rerendered, you want to clear the current value'.

There are 2 ways to do this. 1 way could be to use either javascript or jQuery in order to fetch the field and clear it each time your 'onchange' event fires.

Another option is to force a call to an actionFunction which calls a method in your controller to run code to set 'newType = null;'.

Either option should work. Mostly depends if you wish to have the work server side or client side.

  • My preference would be to use the action method in your controller to set the value to null. Commented Feb 14, 2014 at 15:43
  • Yeah, I kinda knew it had to be done through one of these days. I was trying to avoid it because it's actually more than one value (like 5 or 6 p/different form) so I wanted to turn it to be more automatic. Thanks the help everyone.
    – Rui Rocha
    Commented Feb 14, 2014 at 16:07

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