Running a formula from an event
After you add General formulas using the Settings tab, you can use the formulas when running events. For example, you can set a formula to run when a user clicks a button.
General formulas by default run whenever a form item is changed by the user. You can set formulas to run upon a specific event. For example, if a customer is entering information into an order form, you can set a formula to calculate sales tax and a subtotal when the user clicks a button. To run a formula when a user clicks a button:
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Add a button to your form. 
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Select the newly added button. The Properties side panel opens. 
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Click the Events tab. 
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Select onClick from the list of Client Side events. The onClick options window opens. 
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Select Run a Formula. - Click the list to reveal the list of General formula created in the Settings tab.
- Click Add/Edit Formula to create a formula.
- After you either select or create the formula, click OK to close the onClick window.
 
Parent topic: Adding formulas to your application