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Custom Functions

For advanced or highly customized data processing scenarios, you can use custom functions to implement flexible logic and transformations.

  • Supported language: JavaScript

  • Each function can return a single value only

  • Use the return statement to output the result

  • Custom functions run asynchronously in a separate thread and do not block the UI

  • If no result is returned within 1 second, the function will be automatically terminated

  • Supported only when configuring field default values
    (Not supported in workflow calculation nodes — use the code block node instead)

Usage Example​

This example demonstrates how to:

  • Access field values within a function
  • Process data using custom logic
  • Return the computed result

1. Enable Custom Functions​

In the default value settings of the Date of Birth field, select Function Calculation, then enable Custom Function.

2. Write Custom Function Code​

Access field values​

Define variables at the beginning of the function to receive field values.
After the equals sign (=), select the corresponding field from the left panel.

Return the result using return​

  • Return a value directly:

  • Or assign the result to a variable and return the variable:

3. Save the Function​

4. Test the Function​

5. Retrieve URL Query Parameters​

When using custom functions, you can access URL query parameters using:

SYSTEM_URL_PARAMS.paramName

Where paramName is the parameter key.

Example: Retrieve the corpid parameter from the URL.

Not supported

This method is available only in browsers and is not supported in mobile apps.

Example

Current URL: https://www.mingdao.com/public/form/93cdbb7e20c843478cf988d2d428d86b?corpid=aa163&secledId=123456

Configure custom functions for two text fields:

Custom Function CodeRetrieved Value
return SYSTEM_URL_PARAMS.corpidaa163
return SYSTEM_URL_PARAMS.secledId123456

You can modify the values of corpid and secledId in the URL and refresh the page to retrieve updated values.

If the URL of a view page contains parameters, they can also be accessed when creating a new record.

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