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Try something like:
$(document).ready(function () {
radio = $('#yourRadioField');
dynamicField = $('#yourDynamicField');
dynamicField.hide();
if ( radio.is(':checked') ) { dynamicField.show() }
});
Those are the bare bones of showing and hiding form fields with jquery. For future reference, the questions on stackoverflow tend to be narrowly defined. Broad questions should be first winnowed down with a few google searches.
👤nmac
Source:stackexchange.com