apex:messages

1<!-- For this example to render properly, you must associate the Visualforce page 
2with a valid account record in the URL. 
3For example, if 001D000000IRt53 is the account ID, the resulting URL should be: 
4https://MyDomain_login_URL/apex/myPage?id=001D000000IRt53
5See the Visualforce Developer's Guide Quick Start Tutorial for more information. -->
6         
7
8<!-- Page:  -->
9<apex:page controller="MyController" tabStyle="Account">
10    <apex:messages />
11    <apex:form > 
12        <apex:pageBlock title="Hello {!$User.FirstName}!">
13        This is your new page for the {!name} controller. <br/>
14        You are viewing the {!account.name} account.
15
16        <p>Number of Locations: <apex:inputField value="{!account.NumberofLocations__c}" 
17            id="Location_validation"/> 
18        (Enter an alphabetic character here, then click save to see what happens.) </p>
19           
20        <p>Number of Employees: <apex:inputField value="{!account.NumberOfEmployees}" 
21            id="Employee_validation"/> 
22        (Enter an alphabetic character here, then click save to see what happens.) </p>
23            <p /> 
24        <apex:commandButton action="{!save}" value="Save"/>    
25         <p />
26        </apex:pageBlock>  
27    </apex:form>  
28</apex:page>
29
30/*** Controller  ***/
31public class MyController {
32    Account account;
33
34    public PageReference save() {
35    try{
36        update account;
37    }
38    catch(DmlException ex){
39        ApexPages.addMessages(ex);
40    }
41    return null;
42    }
43
44    public String getName() { 
45        return 'MyController';
46    }
47
48    public Account getAccount() {
49        if(account == null)
50        account = [select id, name, numberofemployees, numberoflocations__c from Account
51        where id = :ApexPages.currentPage().getParameters().get('id')];
52        return account;
53
54    }
55}