Default values in conditional subschemas with oneOf select are not updating correctly

[goodman-web]

Prerequisites

• I have searched the existing issues
• I understand that providing a SSCCE example is tremendously useful to the maintainers.
• I have read the documentation
• Ideally, I'm providing a sample JSFiddle, Codesandbox.io or preferably a shared playground link demonstrating the issue.

What theme are you using?

mui

Version

5.x

Current Behavior

I am experiencing an issue where the default values defined within conditional subschemas are not being updated in the form data when the value of a select field (using oneOf) changes. When a different option is selected in the dropdown, the default value for the conditionally displayed field (hi in this case) does not update to the default value specified in the corresponding then schema. It seems to retain the initial default or remains undefined if no initial default was set for that condition.

const schema = {
  type: "object",
  properties: {
    select: {
      type: "string",
      title: "select me",
      oneOf: [
        { const: 1, title: "1" },
        { const: 2, title: "2" },
        { const: 3, title: "3" },
      ],
    },
  },
  allOf: [
    {
      if: {
        properties: {
          select: {
            const: 1,
          },
        },
      },
      then: {
        properties: {
          hi: {
            title: "hi 1",
            default: 1,
            type: "number",
          },
        },
      },
    },
    {
      if: {
        properties: {
          select: {
            const: 2,
          },
        },
      },
      then: {
        properties: {
          hi: {
            title: "hi 2",
            default: 2,
            type: "number",
          },
        },
      },
    },
    {
      if: {
        properties: {
          select: {
            const: 3,
          },
        },
      },
      then: {
        properties: {
          hi: {},
        },
      },
    },
  ],
};

Playground link

When the value of the "select me" dropdown is changed, the form correctly shows or hides the "hi" field based on the selection. However, the default value of the "hi" field does not update according to the default value specified in the then block corresponding to the selected option. For instance, if "1" is selected initially, "hi 1" might have a default of 1. If the selection is changed to "2", "hi 2" should have a default of 2, but it either retains the initial default (if any) or appears empty.

Expected Behavior

I expect that when the value of the "select me" dropdown changes, the formData for the "hi" field should be updated to the default value specified in the then schema that matches the selected value.

Steps To Reproduce

1. Render a form using the provided schema.
2. Observe the initial state of the "hi" field based on the initial selection in "select me" (or the absence of selection).
3. Change the value of the "select me" dropdown to a different option (e.g., from "1" to "2").
4. Observe that the "hi" field does not update to the default value defined in the then block for the newly selected option.

Environment

rjsf Version: 5.24.10
React Version: 19
Browser: chrome
Operating System: windows

Anything else?

No response

[mamadissad]

yes i have the same issue with range widget . when i change the selection field slider default value won't update .

[heath-freenome]

@goodman-web Right now the default processing logic on run on fields with no data. Once data is applied, it is never updated, since the field types match and the value is good. It would take some effort to update the code to clear out the field when its current value matches the default. Are you interested in helping? Also, given that some people may be relying on the behavior, this is actually a feature enhancement to change the behavior via a feature flag in the experimental_defaultFormStateBehavior.

[Lonli-Lokli]

@heath-freenome I have similar problem with arrays, but seems like intention here is to always merge them, not replace.

My situation is that I have different defaults in dedepndant field based on value in primary. Is it by dsign or you will accept smth under this flag?

[goodman-web]

@heath-freenome I would be very happy to do this task, but unfortunately, I don’t have enough time to complete it. If possible, please handle it yourself—I believe it will solve the problem for many other developers as well. Thank you.