How Knack Works
Design Your Database
Manage Your Records
Build Your Live Application
View and Share Your App
Do More With Knack
Connect Related Data
Users & Access
Calculations & Logic
Emails & Notifications
Search & Queries
Reporting & Dashboards
E-Commerce & Payments
Tables & Connections
Plan Your Connections: Complex Example
Working With Tables
Plan Your Connections: Simple Example
Plan Your Tables
Use Connections in Your App
Connecting Records Together
Connections: Troubleshooting & FAQs
Numeric Equation Functions
Date Equation Settings
Numeric Equation Settings
Text Formula Functions
CSV Format Guide for Importing
Working with Records
Deleting a Page That's Being Linked to
Working with Pages
Navigating the Page Preview
Printing Pages & PDFs
Grid Column Settings
Source: Which Records Will the View Display
Using Action Links
Combining Fields from Connected Records in Views
Using Record Rules
Using Display Rules
Using Submit Rules
Users & Logins
Users and the Page Menu
Manage Roles & Permissions
Single Sign-On with Google, Facebook, Twitter, and Custom
Manage User Records
Logins and Registrations
Live App Security Settings: HIPAA Plans
Live App Security Settings
Tasks & Emails
How do I cancel my Knack account?
I'm over the storage limit for my account. How do I add more storage or get under the limit?
Need account access or to transfer account access because account owner or colleague left the company
I'm over the record limit for my account. How do I add more records or get under the limit?
Is there an option to pay via invoice, check, wire transfer, or something other than a credit card?
How do I freeze or pause my Knack account?
Where can I find a copy of my receipt or invoice?
How do I add more API calls to my account?
How do I change the favicon for my app?
How do I backup or export my apps and data?
How can I track what users are doing in my app?
How do I remove the "Powered by Knack" logo at the bottom of my app?
How do I give Builder access to a colleague or developer for one of my apps?
How do I white label my app?
How do I copy an app from my account to another account?
How do I show multiple dates on a calendar?
How do I add a logo to my app?
How do I find the most recent date from a connected table?
How do I create a field that always shows today's date?
Can I share or connect data between apps?
How do I create an "If, Then" or conditional equation?
How do I merge my apps, or copy pages, tables, or other app elements between my apps?
The menu isn't showing for my app on mobile devices. How do I fix that?
Is there a way to have new users be automatically logged-in after they register?
How do I bulk upload or import multiple files?
How do I move or copy fields or data from one table to another?
How can I show a customer's payment history if I'm collecting payments through my Knack app and through cash or check?
Is there a way to add a display rule to multiple columns at one time instead of having to update each column individually?
Do I need a separate user role table for my Vendors, Customers, Employees, Contacts, etc.?
How can I set up my app so users see only their own data?
Can I combine two date fields into a single date field? For example, combining a start and end date into a single field?
Does Knack offer a service for building apps or have developers I can hire?
How do I bulk upload or import multiple images?
How can I change the color of something in my app?
Is it possible to display more than 100 records at a time on a grid, list, or search view?
Can I migrate or transfer data from Zoho, Quickbase, or TrackVia?
Can I add chat or messaging to my app?
Can I sell my Knack apps?
Can I use Knack on mobile devices?
Do you have a sandbox or developer environment?
Can I send SMS or text messages using Knack?
Can I integrate Knack with other data, products, and services?
Can I create invoices and accept payments?
Can I have an app in a language besides English?
Can I email PDFs or other attachments to users with Knack?
Can I add Google Analytics to my Knack app?
Can I migrate my Access, Filemaker, SQL, or other databases?
Can I prototype for others?
Can I customize the look and feel of my Knack pages?
Can I use a barcode or credit card scanner with Knack?
How secure is Knack?
Does the signature captured through a signature field constitute a legally binding signature?
Does Knack offer a partner program?
How does Knack work on mobile devices? Is it mobile-friendly? Can users download my apps?
Is Knack GDPR compliant?
Storing sensitive data (credit cards, social security numbers, etc.)
Will Knack sign an NDA (Non-Disclosure Agreement)?
Which browsers do you support?
How do I batch download all of the images and files In my app?
I'm seeing an odd character when importing data. How can I get rid of it?
How do I update existing data using an import?
My import is failing or getting stuck. What do I do?
Can I undo or reverse an import?
I'm having trouble importing into a specific type of field. What can I do?
Some of my fields aren't importing correctly. How can I fix that?
I'm having trouble importing into a connection field. What can I do?
Can I import something other than data? Like tables, pages, views, etc?
My import is taking a long time. Can you take a look?
I'm getting an error when importing. What do I do?
Do the validation rules on fields trigger when importing data?
Can I schedule or automate imports?
Can my users import data from the live app, instead of going through the builder/back-end?
I am importing data for the first time. How do I do that?
Can I import data into more than one table at the same time?
How To Guides
Add Functionality to Your Live App
How To Create Discount Codes
Create an Add To Favorites Feature
How to Access Private Records Without a Login
Accept Payments in a Live App
Manage Your Records
Use an Edit Form to Create Records If They Don't Exist
Track Which User Last Updated a Record
Copy a Record Using Record Rules
Track When Records are Created and Updated
Create a Version History for Records
Use Zapier to Insert Connected Records
Work with Connected Records
How to Show Multiple Fields in Your Connection Drop-Down
Showing Parent-Child Records in the Live App
How to Create Dynamic Dropdowns in Forms
Add Read-Only Fields to a Form
How to Change the Layout of Forms
Create a Multi-Part Form
How to Allow Users to Add New Options in Forms
How to Add Instructions to a Form
How to Customize the Text on a Submit Button
How to Automatically Capture a User’s Location on a Form
How to Use URL Variables to Pre-Populate a Form
How to Add a Map to a Details View
How to Add Connection Links to Views
How to Add Inline Editing to a Grid
Create a Print-Friendly Invoice Page
How to Click on an Image to Go to Another Page
How to Add Groupings to a Grid
Users & Logins
Force Users to Reset Their Passwords
Save a User's Payment Method
Create a Single Login Page for Multiple User Roles
Add Read-Only Access For Users
Show Records Connected To The Logged-in User's Company Or Other Group
Show Records Connected to the Logged-in User
Create an Admin User Role to View All Records
Workflow & Automations
Add a Pipeline to Your App
Create a Registration Form with Limited Availability
Add Stages to Your App
Store Multiple Images or Files for Individual Records
Use Multiple Image Sources for a Single Image Field
Create a Button or Link that Updates a Field to a Custom Value
Notify a User That an Item is Ready for Review
Add Assignments to Your App
Approve New Records Before Displaying Them
Add Notification & Reminder Emails to Your App
Add Status Indicators to Your App
Logic, Equations & Formulas
Start an Auto Increment Field from Any Number
Display a Message When a Deadline is Approaching
Generate Simple Numeric Barcodes Automatically
How to Set a Random ID
Calculate Age in Years from a Birthday
How To Number Line Items
Show Upcoming Birthdays
How to Extract the Start and End Dates from a Date Field
How to Display Multiple Date Formats Using a Single Date Field
Reports, Queries, and Summaries
Build an Inventory Manager App
Build a Quiz App
Build a Warehouse Manager App
Build a Member Directory
Build an Orders App
Build a Map Directory or Store Locator App
Images & Files
Manage Your Account
Manage Your Account
About Knack Accounts
Account Plans and Billing
Managing Your Apps
Managing Your Account Settings
Sharing Apps with Shared Builders
App Settings: Map Provider
Script Attack Protection: Whitelisted Custom Code Elements and Attributes
Script Attack Protection: Protected Areas
Security & Infrastructure
Security Best Practices
Builder Security Settings for All Knack Plans
Builder Two-Factor Authentication
Table of Contents
- All Categories
- Builder Guide
- Conditional Rules
Updated by Lesley
What are Conditional Rules?
Conditional rules can be used to automatically set the value of a field based on the rules, or conditions, that you define for the field.
Here are some examples of how conditional rules could be used:
- The value of a Student Rank Field is set to "Honor Roll" if the GPA is higher than 3.
- The value of a Commission Rate Field is set to 5% if the Years Experience is higher than 2.
- The value of an Invoice Status Field is set to "Overdue" if Days Overdue is higher than 0.
Manage Conditional Rules
Adding Conditional Rules
Conditional rules can be added in the Data section of the Builder. Select the table that contains the field you would like to add the rule to, then click on the more options ‘...’ icon next to the field’s name. Conditional rules will appear as an option in this dropdown menu.
For example, in this case, we would like to add a conditional rule to the Task Status field in the Notes table:
Once you check the ‘Add Conditional Rules’ checkbox, you will see the option to add one or more rules to your field:
The rules in the image above set the Budget amount to a custom (specific) value based if the Company value for that record is ‘Regex Solutions’. If not, a default value is set with the second rule (with no criteria).
You can also compare fields to other fields by clicking on the small drop-down arrow to on the rule’s far-right side:
Once added, a "conditional" icon is displayed with the field for easy identification:
Edit Conditional Rules
You can make changes to your conditional rule directly in the editor. Just select the part of your rule that you would like to change:
Copy/Move Conditional Rules
To copy a conditional rule, click on the ‘copy’ icon in the top-right corner of the rule as shown here:
To move and reorder your conditional rules, click on the move icon in the upper-left corner of the rule and drag the rule above or below any other rules listed for that field:
Delete Conditional Rules
To remove a single rule, click on the trashcan icon on the top-right side of the rule:
If you would like to remove all of the conditional rules for a field, either delete each rule or uncheck the ‘Add Conditional Rule’ checkbox above your first rule.
Order of Operations
Any field referenced in a conditional rule must be listed above the field that contains the conditional rule in your Builder. Otherwise, you may get inconsistent results. Remember that you can move fields around in the builder by clicking and dragging them.
Also, if your equation field depends on other formulas or fields with conditional rules, you must list it after these fields since Knack processes those in order that they’re listed in the table. Another way to say this is that if an equation depends on a field, field with a conditional rule, or another equation, those fields must be listed above the equation that uses it.
Notes & Troubleshooting
- Once a field is set to use conditional values it can no longer be added to a form or edited in inline mode. The values will only be set by the rules.
- If a field was added to a form before conditional rules were added to the field, the value of the field will still be set by the conditional rule regardless of what is submitted.
- You can add a field with conditional rules to your form's record rules, however, the value of the field will always be set by the conditional rule.
- You can add multiple criteria to the "When" conditions. Every rule must be true in order to match.
- You can add a rule at the end with zero conditions that will set a "default" value in case any of the previous rules aren't matched. For example, you have a Yes/No field with a default value of "No" and have conditional rules that set the value to "Yes". You will also need to add a conditional rule that first sets all the values to "No". The other conditional rules for "Yes" can follow.
- Values are not "reset" when the criteria that set the value are no longer true. You must have an opposite rule to set the value to its new state.