Transform Property Values

When you register a tool, you can also create a transformer for that tool. Transformer is a function that is called each time any of the properties is changed and gives you an opportunity to modify any or all of the values in the tool.

unlayer.registerTool({
  ...
  transformer: (values, source) => {
    const { name, value, data } = source;
    
    // Transform the values here
    let newValues = {
      ...values
    };
    
    // Return updated values
    return newValues;
  }
);

The arguments passed to the transformer are these:

Option	Description
values	Current property values for the tool
source	An object that contains information for the property that triggered this call: name of the property value of the property data is the optional metadata passed by the updateValue function of the property editor