The Fast Lookup element allows you to search records in Salesforce and save results into an SObject Variable or SObject Collection Variable. The difference between Record Lookup and Fast Lookup is as follows:

Now, we will add one Fast Lookup element to this Flow:

The Loop element is used to check each item in a collection variable and execute an action on it. For example, you can use the Loop element to store SObject Collection Variable values into a Loop variable, that is, SObject Variable and both must have the same object as the collection. You can also use the Loop element to examine the collection variable (data type text) and copy its value into a Text variable.

If the SObject Collection Variable is not null, it means that the old Opportunity record has some followers. We will use Loop element to extract records from the SObject Collection Variable (SocvOld_Opportuntiy_Followers) and store it to the SObject Variable (SovIndividual_Follower_Details):

The Assignment element is used to assign values into the Flow resources:

The Fast Create element allows you to create records using values store in the SObject Collection Variable. The difference between Record Create and Fast Create is as follows:

Now, we will add a Fast Create element with the following steps:

Flow will copy followers from the existing Opportunity record to the newly created Opportunity record.

To customize the Flow user interface, first of all you have to embed the Flow into a Visualforce page. Create a Visualforce page and embed your Flow (Displaying feedback form based on age) into it, as shown in the following code:

<apex:page>
<br/>
<Center>
<Font size ="6" color ="gold">Customer Service Feedback Form </font>
</Center>
<br/>
<flow:interview name="Displaying_feedback_form_based_on_age"/> // Flow interview component is used to embed Flow in a Visualforce Page. Displaying_feedback_form_based_on_age is Flow Unique Name.
</apex:page>

It will display an embedded survey form into the Visualforce page, and will look like the following screenshot:

Flow allows you to modify the user interface by applying a custom style using CSS. It allows you to customize specific parts of a Flow, such as button style, button location, background, and the look and feel of the screen and labels by using a combination of Flow attributes and CSS classes.

A business scenario: Sara Bareilles, who is working on the Flow Displaying feedback form based on age, received a new requirement to change the Date of birth field label color to blue and to display the Next button in green on the top.

To modify the Flow user interface, we have to use Flow style classes with CSS styles. First of all, we will add a CSS style into the Visualforce page to change the color of the Date of birth field label:

<style type="text/css">
.FlowDate {
  color: Blue;
}
</style>

The next task is to modify the Next button's location and color. For which, we will add the flow:interview attributes, buttonLocation and buttonStyle, as shown in the following code:

<flow:interview name="Displaying_feedback_form_based_on_age"
                buttonLocation="top"
                buttonStyle=" color:Green; border:1px solid;"
/>

So finally, the Visualforce page code will look like the following code snippet:

<apex:page >
  <br/>
    <Center>
      <Font size ="6" color ="gold">Customer Service Feedback Form </font>
    </Center>
  <br/>
  <style type="text/css">
    .FlowDate {
      color: Blue;
  }
  </style>
  <flow:interview name="Displaying_feedback_form_based_on_age"
                  buttonLocation="top"
                  buttonStyle=" color:Green; border:1px solid;"
  />
</apex:page>

The Visualforce page will look like the following screenshot:

You can change the CSS style sheet as per your requirement.

Once you are done with design, save the Visualforce page with name Flow for Force.com Sites. The next step is to open the Flow for unauthenticated access using Force.com Sites.

Using Force.com Site, open a Flow for unauthenticated access. Once you have embedded the Flow into a Visualforce page, with help of Force.com Sites, you can open it for unauthenticated access. This means that users can access the Flow without logging into Salesforce. To open the access of the Flow Displaying feedback form based on age, we have to add the Visualforce page Flow for Force.com Sites into Force.com Sites. For more details, perform the following steps:

You can check Site usage history by navigating to the 24-Hour Usage History related list available in the Site detail page.

If you want to redirect a user to a specific page such as the home tab, detail page, or specific record, use the URLFOR function. Let's take an example: if you want to redirect your Flow user to a lead tab after completion of the Flow, use the following method:

<flow:interview name="FlowUniqueName" finishLocation="{!URLFOR('/00Q/o')}" />

If you want to redirect your Flow user to another Visualforce page without using the URLFOR function, you can use the $Page variable. Use the name of the Visualforce page with the $Page variable, as shown in the following example:

<flow:interview name="FlowUniqueName" finishLocation="{!$Page. Flow_Partner_Community}"/>

Using a custom controller, you can set the finish location for a Flow. Imitate a new page reference by passing the URL (as string) to define the location, as shown in the following controller example:

public class FlowRedirect {
    public PageReference getPageA() {
        return new PageReference('/001'),
    }
}

The following is the code for the Visualforce page that uses a custom controller and sets the Flow's finish behavior:

<apex:page controller="myFlowController">
  <flow:interview name="flowname" finishLocation="{!pageA}"/>
</apex>

Using the preceding options, you can redirect Flow users to another page/URL, but not the URL that is external to your Salesforce organization.

If you have created a Flow and allow your users to access it from the Salesforce1 mobile application, then you have to embed the Flow into a Visualforce page.

A business scenario: Helina Jolly, who is working as a system administrator in Universal Container, developed the Clean Chatter Group Feeds Flow in Chapter 3, Manipulating Records in Visual Workflow (under the Hands on 3 – quickly update an account record section). She received another requirement from her manager to make this Flow available to Salesforce1 users.

To make a Flow available for Salesforce1 users through the navigation menu, perform the following steps:

To use Flow as the publisher action, you have to embed it into the Visualforce page with a standard controller.

A business scenario: Alice Atwood is working as a system administrator in Universal Container and has developed a Flow to copy Opportunity followers in this chapter. She received another requirement to make it available for the Salesforce1 publisher action on Opportunity object.

To make a Flow available for the publisher action, perform the following steps:

You can set a variable's value without using the controller by hard coding the variables value. Here's an example that sets the initial value of VarT_NewOppID to 006B0000002REvl when the interview starts, as shown in the following sample code:

<apex:page Standardcontroller="Opportunity">
  <flow:interview name="Copying_the_record_followers" >
    <apex:param name="VarT_NewOppID" value="006B0000002REvl"/>
  </flow:interview>
</apex:page>

Without a controller, you can only set the value of variables.

By using the standard controllers, you can set variables or SObject Variables by passing in data from a record. Let's see an example that sets the initial value of VarT_NewOppID to the Visualforce expression {!Opportunity.Id} when the interview starts, as shown in the following sample code:

<apex:page Standardcontroller="Opportunity">
  <flow:interview name="Copying_the_record_followers" >
    <apex:param name="VarT_NewOppID" value="{!Opportunity.Id}"/>
  </flow:interview>
</apex:page>

With the standard controller, you can set the value of variables and SObject variables.

You can set Flow variable values using the custom controller as well. You can write a custom controller that sets the variables values, and then you can reference that controller in your Visualforce page. The following example sets the variable OppId value to a specific Opportunity IDs when the interview starts by using a custom controller, as shown in the following sample code for controller. The controller used the get value in the variable OppId and passed it to Visualforce page:

public class FlowCustomController {
    public Opportunity OppId {get; set;}
    public FlowCustomController () {
        OppId = [
            SELECT Id, Name FROM Opportunity
            WHERE Name = 'Edge Installation' LIMIT 1];
    }
}

The following is the code for the Visualforce page that embedded the Flow and is passing value to the OppId variable with help of the custom controller:

<apex:page Standardcontroller=" FlowCustomController ">
  <flow:interview name="Copying_the_record_followers" >
    <apex:param name="VarT_NewOppID" value="{!OppId}"/>
  </flow:interview>
</apex:page>

By using the custom controller, you can set the value of variables, collection variables, SObject Variables, and SObject Collection Variables.

Don't forget to grant the Visualforce page and custom controller access to users; it's only then that they can access the Flow.

A Visualforce page allows you to call a Flow using the custom controller. To launch an autolaunched Flow from Apex, you have to use the start() method in the Flow.Interview class.

A business scenario: Joe Thompson is working as a system administrator in Universal Container and developed a Flow to update the account rating in Chapter 3, Manipulating Records in Visual Workflow (under the Hands on 3 – quickly update an account record section). He embedded the Flow into a Visualforce page and also added a Start button on the Visualforce page. Now, he wants to call the Flow as soon as users click on the Start button, without showing the Flow in the user interface.

Create a Visualforce page using a custom controller and add one command button on it:

<apex:page controller="FlowController">
    <apex:outputLabel id="text">
        <b>Click on Start button to call the flow</b>
    </apex:outputLabel>
    <apex:form >
        <apex:commandButton action="{!start}" Value="Start"/>
    </apex:form>
</apex:page>

The following is the sample code for the custom controller; it launches the Flow using the start() method:

public with sharing class FlowController {
   public Flow.Interview.Update_an_account myFlow {get; set;} //Instance of the Flow
       public void start() {
       Map<String, Object> Var= new Map<String, Object>();
       myFlow = new Flow.Interview.Update_an_account(Var);
       myFlow.start();
   }
}

You can use getVariableVale(String) in the custom code to get the value of the specified Flow variable.