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javascript: How to clean an input box when another input value changed?
window.onload = function() {
    // the document has loaded => we could access the DOM
    // we subscribe to the onchange event pf the parent:
    document.getElementById('parentId').onchange = function() {
        // and when this event is triggered we clean the child
        // element value
        document.getElementById('childId').value = '';
    };
};