I have a form with a reset button.
In the form there is a text that derived from the inputs and updates using param.watch on each input.
When i click reset i clear all inputs with <input>.value = ''
But this is updating the text on each change.
How can I prevent it?
You should have a look at the batch or discard mechanisms, available with the batch_call_watchers and discard_events functions of Param.
Can this be used with inputs in CompositeWidget?
You’ll have to share some code and an example for me to try to reply to that question 
something like:
class FunctionCreationForm(ScriptingLanguageWidgetBase):
_tags_input = None
_functions_select = None
_duration_input = None
_operators_select = None
_condition_input = None
_expression = None
tag_input_title = 'Tag *'
function_select_title = 'Function'
duration_input_title = 'Duration (min)'
operator_select_title = 'Operator *'
condition_input_title = 'Condition *'
def __init__(self, state, *args, **kwargs):
widget_size = dict(width=150, height=60)
self._tags_input = pn.widgets.MultiChoice(name=self.tag_input_title,
solid=False,
options=state.tags,
max_items=1,
option_limit=5,
**widget_size)
self._functions_select = pn.widgets.Select(name=self.function_select_title,
options=[''] + list(FUNCTIONS),
**widget_size)
self._duration_input = pn.widgets.TextInput(name=self.duration_input_title, **widget_size)
self._operators_select = pn.widgets.Select(name=self.operator_select_title,
options=[''] + list(self.operators),
**widget_size)
self._condition_input = pn.widgets.TextInput(name=self.condition_input_title, **widget_size)
self._expression = ScriptingLanguageExpressionForm(state,
*args,
state_tree_keyword=self.state_tree_keyword,
**kwargs)
super().__init__(state, *args, **kwargs)
self._expression.on_query_change(self._clear_inputs)
self.subscribe_input_events()
self.state.register_events(self.on_tags_change)
def subscribe_input_events(self):
self._tags_input.param.watch(self.create_expression, ['value'])
self._duration_input.param.watch(self.create_expression, ['value_input'])
self._condition_input.param.watch(self.create_expression, ['value_input'])
self._operators_select.param.watch(self.create_expression, ['value'])
self._functions_select.param.watch(self.create_expression, ['value'])
def _clear_inputs(self, *args, **kwargs):
# FIXME prevent all below input from triggering events
self._tags_input.value = []
self._functions_select.value = ''
self._duration_input.value_input = ''
self._operators_select.value = ''
self._condition_input.value_input = ''
self.create_expression()