apex:param

A parameter for the parent component. The <apex:param> component can only be a child of the following components:

<apex:actionFunction>
<apex:actionSupport>
<apex:commandLink>
<apex:outputLink>
<apex:outputText>
<flow:interview>

Use this component to get user input for a controller method that does not correspond to a field on an sObject. Only <apex:inputField> and <apex:outputField> can be used with sObject fields.

Within <apex:outputText>, there’s support for the <apex:param> tag to match the syntax of the MessageFormat class in Java.

apex:outputLink Example

1<!-- For this example to render fully, associate the page
2with a valid contact record in the URL.
3For example: https://MyDomain_login_URL/apex/myPage?id=001D000000IRt53 -->
4
5<apex:page standardController="Contact">
6    <apex:outputLink value="http://google.com/search">
7        Search Google
8        <apex:param name="q" value="{!contact.name}"/>
9    </apex:outputLink>
10</apex:page>

Attributes

Attribute Name	Attribute Type	Description	Required?	API Version	Access
`assignTo`	Object	A setter method that assigns the value of this param to a variable in the associated Visualforce controller. If this attribute is used, getter and setter methods, or a property with get and set values, must be defined.		10.0	global
`id`	String	An identifier that allows the param component to be referenced by other components in the page.		10.0	global
`name`	String	The key for this parameter, for example, name=“Location”.	Yes	10.0	global
`value`	Object	The data associated with this parameter, for example, value=“San Francisco, CA”. The value attribute must be set to a string, number, or boolean value.	Yes	10.0	global