What You'll Build

Forms with dynamic read-only fields that automatically calculate results, lock fields based on conditions, and display information-only panels. You'll learn how to create intelligent forms that adapt their behavior based on user input.

What You'll Learn

Creating calculated result fields that update automatically
Conditionally locking fields based on form state
Building display-only information panels
Using computed values for read-only content
Propagating read-only state from subforms to fields
Cascading read-only through nested subforms
How different control types behave in read-only mode

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Interactive Learning

Every code snippet below is fully editable! Feel free to modify the code, experiment with different values, and see your changes reflected instantly in the live preview on the right.

Use the play button to run different snippet, or the refresh button to restore the original example.

Tutorial Steps

Step 1: Starting Point

Let's start with an empty form function. This is where we'll build our dynamic read-only form step by step.

Step 2: Calculated Result Fields

Let's create fields that automatically calculate and display results. These fields are read-only and update in real-time as users modify the input values.

💡 Tip:

When using computedValue, the field automatically becomes read-only. No need to add isReadOnly: true - the computed value makes it display-only!

Step 3: Conditionally Locking Fields

Now let's create fields that become read-only based on certain conditions. This is useful for fields that should be locked after certain selections.

💡 Tip:

The isReadOnly property can take a function that returns true/false. When true, the field becomes read-only. Try changing the account type to see fields lock/unlock!

Step 4: Display-Only Information Panels

Finally, let's create information panels that display dynamic content based on form state. These are perfect for status messages, summaries, and user feedback.

💡 Tip:

Text panels with computedValue are perfect for displaying dynamic information, status messages, and form summaries. They automatically update as the form state changes!

Step 5: Subform ReadOnly Propagates to Fields

When a subform is set to read-only, all fields inside it automatically become read-only. This is useful for locking entire sections of a form at once.

💡 Tip:

Setting isReadOnly on a subform propagates to all fields inside it. You don't need to set isReadOnly on each field individually - the subform handles it!

Step 6: Nested Subforms ReadOnly Propagation

When a parent subform is read-only, all nested subforms and their fields also become read-only. This propagation works at any depth level!

💡 Tip:

ReadOnly state cascades through nested subforms automatically. Locking a parent subform locks all children at every level - no additional configuration needed!

Step 7: All Controls - Individual ReadOnly Toggle

This comprehensive example demonstrates how every control type behaves in read-only mode. Use the checkboxes at the top to toggle read-only state for each control individually.

💡 Tip:

Each control type has its own visual indication of read-only state. Toggle the checkboxes to see how different controls (textbox, dropdown, slider, ratings, etc.) display when locked!

Step 8: Controls in Subforms - Group ReadOnly Toggle

This example shows how to lock entire groups of controls at once using subform read-only. Controls are organized by type into separate subforms, and each subform can be locked independently.

💡 Tip:

Organizing related controls into subforms makes it easy to lock/unlock entire sections. Toggle a subform's read-only state to affect all controls inside it simultaneously!

Try It Yourself

Challenge 1: Add a "Grade" field that shows "A" for 90+, "B" for 80-89, "C" for 70-79, etc.
Challenge 2: Create a field that becomes read-only when a checkbox is checked
Challenge 3: Add a status panel that shows different messages based on form completion percentage
Challenge 4: Create a form with multiple subforms where a "master lock" checkbox locks all subforms at once
Challenge 5: Build a nested form structure (3+ levels deep) and verify readonly propagation works at all levels

Next Steps

Excellent! You've learned how to create dynamic read-only fields and intelligent form behavior. Ready to explore more advanced form patterns?

Back to Text Inputs Tutorial

Other learning paths:

Learn about form validation patterns
Master complex form logic
Create multi-step wizards