Hello Mathew,

The above snippet of code has also been very helpful for me. Can you please help me do the same but if it were a checkbox instead of a radio button. I am not able to make it work for my checkbox field. I am also working on the new form designer.

Each time I select monitor I need it to have a valid number for the Number of Monitors. 

Thank you for helping.

With radio buttons, the LFForm.getFieldValues function is returning a string, so that is what we are evaluating against (selectedValue == 'Approve').

But with checkboxes, the LFForm.getFieldValues function returns an array of values rather than a string.  So the code from before only works if only the single checkbox is marked, it doesn't work if more checkboxes are marked.
For comparison: ['Apple'] == 'Apple' should evaluate true,
but ['Apple', 'Orange', 'Banana'] == 'Apple' will evaluate as false.
Side note that using ['Apple'] === 'Apple' will evaluate as false because == does type conversion before comparison and === does not.  So when you use == with ['Apple'] it is actually converting it to 'Apple' before doing the comparison, but when you use === it doesn't do that, so the single value array won't evaluate as equal to the string.

In this case, instead of evaluating if the value is equal to a specific string, we should be able to evaluate if the array contains the expected string.  See the w3schools.com page about Javascript Array includes() function.

So we just need to rewrite line 3 of the code to evaluate if the array contains the string.  Like this: 

LFForm.onFieldChange(function() {
  var selectedValue = LFForm.getFieldValues({fieldId: 283}).value;
  if (selectedValue.includes('Approve')) {
    LFForm.setFieldValues({fieldId: 285}, "");
  }
}, {fieldId: 283});