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Now, we'll take a look at some business rules. We're going to add several rules to automate parts of the form. We will use the frevvo Visual Rule Builder to create the code for all but one of these rules.

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1. Click Rules in the Guided Designer Navigation bar at the top of the page. 
2. Click Create a new rule.
3. Change the name of the rule to: Initialize form

4. Click on the Rule Run Builder button.
   

   1. Click Next to go to the Action wizard.

   2. The first action appears by default. If needed, click the Add Action button on the top right of the Action Wizard

   3. Select TodaysDate from the first dropdown. TodaySDate is the Name of the Date control at the top of the form. If your control is named something else, select that control from the dropdown.

   4. Select to from the second dropdown

   5. Type today in the Expression field and click on the today function when it displays in the dropdown 

5. Click Finish.

6. Save and Test. Now, when the end user first starts using the form, the Date control at the top will be set to today's date. No need for the user to type it in.

   Expand
   title Click here to see this rule in the Visual Rule Builder

   
   

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Save and Test your form. Now, when the user selects an item, the price for that item will be displayed.

for (var i = 0; i < Item.value.length; i++) {
  if (Item[i].value === 'Chevrolet') {
    Price[i].value = 125.75;
  } else if (Item[i].value === 'Chrysler') {
    Price[i].value = 118.75;
  } else if (Item[i].value === 'Ford') {
    Price[i].value = 132.75;
  }
}

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1. Click Form  in the Guided Designer navigation bar to return to the form. In the Order Items table, select the Subtotal column by clicking on the header. In the Properties panel, uncheck Enabled. The entire column is grayed out.
2. Go back to the rules editor and create a new rule. Change the name of the rule to: Calculate SubTotals

3. Click on the Rule Run Builder button. You will see the Condition wizard

   1. Select your Price control from dropdown

   2. Select "is filled" from the Property dropdown

   3. Click Next to go to the Action wizard.

   4. Select your Subtotal control from the dropdown.

   5. Select "to" from the second dropdown

   6. Type Price * Quantity in the Expressions field

4. Click Finish then  save and test. Now, when the end user selects the item and fills in the quantity, the Subtotal will be calculated for each row of the table
   
   

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1. Click Form  in the Guided Designer navigation bar to return to the form. Click on the Grand Total control. Uncheck Enabled in the Properties panel. The field is greyed out.
2. Go back to the rules editor, create a new rule and edit it. Change the name of the rule to: Calculate Grand Total

3. Click on the Rule Run Builder button. You will see the Condition wizard
   

   1. Click Next to go to the Action wizard.

   2. Select your Grand Total control from the first dropdown.

   3. Select "to" from the second dropdown

   4. Type sum in the Expressions field and click on the sum function when it displays in the dropdown 

   5. Select the Subtotal field from the dropdown then add the closing parenthesis

4. Click Finish then  save and test.
   
   

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Now, the overall Grand Total is automatically calculated and updated with the Subtotal amounts as rows are filled in and added to the table. Try deleting a row in the table. Notice the Subtotal amount for that row is subtracted from the Grand Total 

 has frevvo has a powerful Rules engine. You can perform many dynamic actions in your form including the examples above as well as many other actions like connecting to back end systems and retrieving JSON to populate form controls. The Visual Rule Builder makes it easy to create rules to show/hide parts of the form, automatically fill in user information, make controls required or optional dynamically without writing code. For more information, refer to the Rules Examples documentation.

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