CODE EXAMPLE FOR JAVASCRIPT

adding transition to collapse button js

function showHide(shID) {
    if (document.getElementById(shID)) {
        if (document.getElementById(shID + '-show').style.display != 'none') {
            document.getElementById(shID + '-show').style.display = 'none';
            document.getElementById(shID).style.display = 'block';
        } else {
            document.getElementById(shID + '-show').style.display = 'inline';
            document.getElementById(shID).style.display = 'none';
        }
    }
}