Untitled

When looping through a set of Salesforce.com SObjects from a VisualForce page, you may want to test whether the SObject has any children without wrapping the SObjects in a wrapper class. Here's how:

 

Controller:

Create a property in the controller that is a map of the parent IDs and Boolean flag.

 

public Map<Id, Boolean> hasChildren {

  get {

    if (this.hasChildren == null) {

      for (Parent__c parent : [select id, (select id from children__r) from parent__c]) {

        if (parent.children__r.size() > 0) {

          this.hasChildren.put(parent.id,true);

        } else {

          this.hasChildren.put(parent.id,false);

        }

      }

    }

    return this.hasChildren;

  }

  set {

    this.hasChildren = value;

  }

}

 

Visualforce Page:

Use dynamic bindings to check if the parent has any children while looping in Visualforce. This example renders the text if there are children.

 

<apex:repeat value="{!parents}" var="parent">

  <apex:outputtext value="-----" rendered="{!hasChildren[parent.id]}" />

</apex:repeat>