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.

Example

<!-- For this example to render properly, you must associate the Visualforce page 
with a valid account record in the URL. 
For example, if 001D000000IRt53 is the account ID, the resulting URL should be: 
https://Salesforce_instance/apex/myPage?id=001D000000IRt53
See the Visualforce Developer's Guide Quick Start Tutorial for more information. -->
                        
         
<!-- Page: -->
<apex:page controller="MyController" tabStyle="Account"> <style> .locationError { color: blue; font-weight: strong;} .employeeError { color: green; font-weight: strong;} </style> <apex:form > <apex:pageBlock title="Hello {!$User.FirstName}!"> This is your new page for the {!name} controller. <br/> You are viewing the {!account.name} account. <p>Number of Locations: <apex:inputField value="{!account.NumberofLocations__c}" 
            id="Location_validation"/> (Enter an alphabetic character here, then click Save to see what happens.) </p> <p>Number of Employees: <apex:inputField value="{!account.NumberOfEmployees}"
            id="Employee_validation"/> (Enter an alphabetic character here, then click Save to see what happens.) </p> <p /> <apex:commandButton action="{!save}" value="Save"/> <p /> <apex:message for="Location_validation" styleClass="locationError" /> <p /> <apex:message for="Employee_validation" styleClass="employeeError" /> <p /> </apex:pageBlock> </apex:form> </apex:page> /*** Controller ***/
public class MyController { Account account; public PageReference save() { try{ update account; } catch(DmlException ex){ ApexPages.addMessages(ex); } return null; } public String getName() { return 'MyController'; } public Account getAccount() { if(account == null) account = [select id, name, numberofemployees, numberoflocations__c from Account where id = :ApexPages.currentPage().getParameters().get('id')]; return account; } }

Attributes

Attribute Name Attribute Type Description Required? API Version Access
dir String The direction in which the generated HTML component should be read. Possible values include "RTL" (right to left) or "LTR" (left to right). 10.0 global
for String The ID of the component with which the message should be associated. 10.0 global
id String An identifier that allows the message component to be referenced by other components in the page. 10.0 global
lang String The base language for the generated HTML output, for example, "en" or "en-US". For more information on this attribute, see the W3C specifications. 10.0 global
rendered Boolean A Boolean value that specifies whether the component is rendered on the page. If not specified, this value defaults to true. 10.0 global
style String The style used to display the message, used primarily for adding inline CSS styles. 10.0 global
styleClass String The style class used to display the message, used primarily to designate which CSS styles are applied when using an external CSS stylesheet. 10.0 global
title String The text to display as a tooltip when the user's mouse pointer hovers over this component. 10.0 global
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