recordSetVar attribute in Visual force page: This attribute indicates that VF page uses set oriented standard controller. The value of the attribute indicates name of the set of records passed to the page means collection records. This record set can be used in the expressions to return values for display on the page or to perform actions on set of records.https://developer.salesforce.com/docs/atlas.en-us.pages.meta/pages/pages_compref_page.htm For example given below VF page, if your page is using the standard accounts controller, and recordSetVar is set to "accounts", you could create a simple pageBlockTable of account records by doing the following:
<apex:pageBlockTable value="{!accounts}" var="a">
<apex:column value="{!a.name}"/>
</apex:pageBlockTable>
VF Page:
Associating a Standard List Controller with a Visualforce PageUsing a standard list controller is very similar to using a standard controller. First you set the standardController attribute on the <apex:page> component, then you set the recordSetVar attribute on the same component.<apex:page standardController="Account" recordSetVar="accounts">
<apex:dataList var="a" value="{!accounts}" type="1">
{!a.name}
</apex:dataList>
</apex:page>
Above displays all account with number.
For example, to associate a page with the standard list controller for accounts, use the following markup:
1) https://developer.salesforce.com/docs/atlas.en-us.pages.meta/pages/pages_controller_sosc_associate.htm<apex:page standardController="Account" recordSetVar="accounts">
Let us know if this will help you<apex:page standardController="Account" recordSetVar="accounts">
<apex:form >
<apex:pageBlock >
<apex:pageBlockTable value="{!accounts}" var="a" >
<apex:column value="{!a.Id}"/>
<apex:column value="{!a.name}"/>
</apex:pageBlockTable>
</apex:pageBlock>
</apex:form>
</apex:page>
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