[SalesForce] Clear Apex:PageMessages without losing viewstate

Is there a way to clear the PageMessages in my controller without losing my Page's viewstate?

At the moment I'm doing a ajax call from my visualforce page, which rerenders part of my page, but this could also generate new error messages, I would like to clear older error messages without having to reload my entire page and loose the viewstate.

I've tried

ApexPages.getMessages().clear();

In my extension, without luck, and the documentation doesn't seem to be very helpful on this point either.

Best Answer

There are some alternative ways to display error messages, but like @Mark Pond answered you cannot clear the ApexPages.getMessages(). Also, you cannot iterate over it and replace the elements on it, or rather you can but it doesn't stick just like you observed with the clear() call.

I suspect that the List that is returned by getMessages() is defensive copy of what is actually stored.

There are alternatives, such as doing away completely with apex:pageMessages in favor of using apex:pageMessage and building up your own error message(s) to display under that tag. Obviously there are drawbacks such as maintainability with having to manually handle and report on all of the errors.

Related Solutions

[SalesForce] not working if showHeader=”false”

For some reason, messages created inside the constructor are not displayed when the page header isn't shown. If you move that to a method and add it to your actions, it will work. Also, you need to load the standard style sheets since they are usually included with the header. If you don't it looks ugly.

The controller:

<apex:page controller="MyTest1" showHeader="false" standardStylesheets="true" action="{!loadMessages}">
  <h1>Hello</h1>
  <apex:PageMessages />
</apex:page>

The class:

public class MyTest1 {
        public MyTest1() {}

        public void loadMessages() {
             ApexPages.addMessage(new ApexPages.Message(ApexPages.Severity.ERROR,'See Error'));
        }
}

[SalesForce] Custom errors using apex:pageMessages

I will not try to reproduce the excellent answer already provided by @JesseAltman, but I believe this will help you do whatever you need around your error messages.

It goes over each messaging option (In a ridiculous amount of detail). Also goes over the caveats of each, which does include styling. I would take a look.

Difference between the multiple messaging options in Visualforce?

Best Answer

Related Solutions

[SalesForce] not working if showHeader=”false”

[SalesForce] Custom errors using apex:pageMessages

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