Differences between all of the messaging options

Hello ,

Please have a look on this link this one solve your query :-http://salesforce.stackexchange.com/questions/8139/difference-between-the-multiple-messaging-options-in-visualforce

Hi

Add more point:

<apex:pageMessage>

This component is used to dispaly custom messages with severity error,warning etc.  in the VF page.

<apex:page controller="MyRegisterCon2" sidebar="false" docType="HTML-5.0"   >

<apex:form >
<apex:pageBlock >
<apex:pageblockSection columns="1" >
 <apex:pageMessage summary="This is page message"  severity="warning" strength="3" />
<apex:inputtext value="{!FirstName}" label="First Name"  />
<apex:inputtext value="{!LastName}" label="Last Name" />
<apex:input value="{!Jdate}" label="DOB" type="date" id="dob" />
<apex:inputtext value="{!Phone}" label="Phone"  id="phone"  />
</apex:pageblockSection>
<apex:pageBlockButtons >
<apex:commandButton value="submit" action="{!save}" />
</apex:pageBlockButtons>
</apex:pageBlock>
</apex:form></apex:page>

<apex:pageMessages>

The  above component provides the SF styling for the messages. 

<apex:page controller="MyRegisterCon2" sidebar="false" docType="HTML-5.0"   >

<apex:form >
<apex:pageBlock >
<apex:pageblockSection columns="1" >
<apex:pageMessages />
<apex:inputtext value="{!FirstName}" label="First Name"  />
<apex:inputtext value="{!LastName}" label="Last Name" />
<apex:input value="{!Jdate}" label="DOB" type="date" id="dob" />
<apex:inputtext value="{!Phone}" label="Phone"  id="phone"  />
</apex:pageblockSection>
<apex:pageBlockButtons >
<apex:commandButton value="submit" action="{!save}" />
</apex:pageBlockButtons>
</apex:pageBlock>
</apex:form></apex:page>

<apex:messages>

Include above code in VF page it will display all the messages . If we observe styling was not applied to the messages.

<apex:page controller="MyRegisterCon2" sidebar="false" docType="HTML-5.0"   >

<apex:form >
<apex:pageBlock >
<apex:pageblockSection columns="1" >
<apex:messages />
<apex:inputtext value="{!FirstName}" label="First Name"  />
<apex:inputtext value="{!LastName}" label="Last Name" />
<apex:input value="{!Jdate}" label="DOB" type="date" id="dob" />
<apex:inputtext value="{!Phone}" label="Phone"  id="phone"  />
</apex:pageblockSection>
<apex:pageBlockButtons >
<apex:commandButton value="submit" action="{!save}" />
</apex:pageBlockButtons>
</apex:pageBlock>
</apex:form></apex:page>

<apex:message>:

This component is used to display warning or error message for a specific component.

Change visualforce to following code.

<apex:page controller="MyRegisterCon2" sidebar="false" docType="HTML-5.0"   >

<apex:form >
<apex:pageBlock >
<apex:pageblockSection columns="1" >
<apex:message for="phone" />
<apex:inputtext value="{!FirstName}" label="First Name"  />
<apex:inputtext value="{!LastName}" label="Last Name" />
<apex:input value="{!Jdate}" label="DOB" type="date" id="dob" />
<apex:inputtext value="{!Phone}" label="Phone"  id="phone"  />

</apex:pageblockSection>
<apex:pageBlockButtons >
<apex:commandButton value="submit" action="{!save}" />
</apex:pageBlockButtons>
</apex:pageBlock>
</apex:form>

</apex:page>

Hope this will help you.

Thanks