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Ashritha Reddy
Differences
Difference In Between Apex PageMessage, PageMessages and Message VF Pages Tags in Salesforce
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apex:pageMessage
apex:pageMessage should be used for presenting only custom messages in the page, for errors, warnings and other types of messages for a given severity.
We have to provide severity and strength for custom messages.
Ref : https://developer.salesforce.com/docs/atlas.en-us.pages.meta/pages/pages_compref_pageMessage.htm (https://developer.salesforce.com/docs/atlas.en-us.pages.meta/pages/pages_compref_pageMessage.htm)
Ex:
<apex:pageBlock >
<apex:pageMessage summary="This pageMessage will always display. Validation error
messages appear in the pageMessages component." severity="warning" strength="3" />
<apex:pageMessages />
</apex:pageBlock>
apex:pageMessages
apex:pageMessages displays all messages that were generated for all components on the current page, presented using the Salesforce styling.
No need to provide severity and strength. Tekes Salesforce styling.
Ref : https://developer.salesforce.com/docs/atlas.en-us.pages.meta/pages/pages_compref_pageMessages.htm
Ex:
<apex:pageBlock >
<apex:pageMessages />
</apex:pageBlock>
apex:message
A message for a specific component, such as a warning or error. If an <apex:message> or <apex:messages> component is not included in a page, most warning and error messages are only shown in the debug log.
Ref : https://developer.salesforce.com/docs/atlas.en-us.pages.meta/pages/pages_compref_message.htm
All Answers
Refer this Links. It may help you.
1. https://developer.salesforce.com/forums?id=906F00000008xuuIAA
2. http://salesforce.stackexchange.com/questions/8139/difference-between-the-multiple-messaging-options-in-visualforce
3. http://cloudisfuture.blogspot.in/2012/08/difference-in-between-apex-pagemessage.html
4. http://www.infallibletechie.com/2014/01/difference-between-apexpagemessage-and.html & http://sfdchackathon.blogspot.in/2015/06/difference-between-and.html
Thanks
Siva
apex:pageMessage
apex:pageMessage should be used for presenting only custom messages in the page, for errors, warnings and other types of messages for a given severity.
We have to provide severity and strength for custom messages.
Ref : https://developer.salesforce.com/docs/atlas.en-us.pages.meta/pages/pages_compref_pageMessage.htm (https://developer.salesforce.com/docs/atlas.en-us.pages.meta/pages/pages_compref_pageMessage.htm)
Ex:
<apex:pageBlock >
<apex:pageMessage summary="This pageMessage will always display. Validation error
messages appear in the pageMessages component." severity="warning" strength="3" />
<apex:pageMessages />
</apex:pageBlock>
apex:pageMessages
apex:pageMessages displays all messages that were generated for all components on the current page, presented using the Salesforce styling.
No need to provide severity and strength. Tekes Salesforce styling.
Ref : https://developer.salesforce.com/docs/atlas.en-us.pages.meta/pages/pages_compref_pageMessages.htm
Ex:
<apex:pageBlock >
<apex:pageMessages />
</apex:pageBlock>
apex:message
A message for a specific component, such as a warning or error. If an <apex:message> or <apex:messages> component is not included in a page, most warning and error messages are only shown in the debug log.
Ref : https://developer.salesforce.com/docs/atlas.en-us.pages.meta/pages/pages_compref_message.htm