var base_treeNG_url = 'https://almaview.unibo.it//kform/avng/utils/treeNG';

function unset_max_height(el) {
    //Pop tree class which sets overflow and maxHeight
    var tree_ul = el.firstChild;
    var old_class = tree_ul.getAttribute("class");
    var i = old_class.indexOf("tree");
    var new_class = old_class.substr(0, i) + old_class.substr(i+4);
    
    tree_ul.setAttribute("class", new_class);
}

function expand_tree(treename, id, url, query_string, sync) { //sync di default e' 0, per l'inizializzazione e' 1
    el = GetElementById(treename+id)
    if (sync == 0) 
       SetInnerHTMLbyUrl(el, url, query_string, "POST", unset_max_height)
    else {
       SetSyncInnerHTMLbyUrl(el, url, query_string);
       unset_max_height(el)
    }
    GetElementById('exp'+id).style.display = 'none';
    GetElementById('red'+id).style.display = 'inline';
}

function reduce_tree(treename, id) {
    el = GetElementById(treename+id)
    DelInnerHTML(el)
    GetElementById('exp'+id).style.display = 'inline'
    GetElementById('red'+id).style.display = 'none'
}

function expand_org_tree(parent, gid, choice, treeid, choice_name, unique_prefix) {
    //base for new tree id, ancient, url, query_string, sync
    var query = 'parent='+parent+'&gid='+gid+'&choice='+choice+'&treeid='+treeid
    if ((choice_name)&&(choice_name != 'tree_gid')) {
       query += '&choice_name='+choice_name
    }
    if (unique_prefix) {
       query += '&unique_prefix='+unique_prefix
    }
    else
       unique_prefix = ''
    return expand_tree('orgsubtree', unique_prefix+treeid, base_treeNG_url+'/get_html_gid_subtree', query, 0)
}

function expand_net_tree(parent, nid, choice, treeid, choice_name, unique_prefix) {
    //base for new tree id, ancient, url, query_string, sync
    var query = 'parent='+parent+'&nid='+nid+'&choice='+choice+'&treeid='+treeid;
    if ((choice_name)&&(choice_name != 'tree_nid')) {
       query += '&choice_name='+choice_name
    }
    if (unique_prefix) {
       query += '&unique_prefix='+unique_prefix
    }
    else
       unique_prefix = ''
    return expand_tree('netsubtree', unique_prefix+treeid, base_treeNG_url+'/get_html_nid_subtree', query, 0)
}

function expand_colour_tree(parent, tcid, choice, treeid, choice_name) {
    //base for new tree id, ancient, url, query_string, sync
    var query = 'parent='+parent+'&tcid='+tcid+'&choice='+choice+'&treeid='+treeid
    if ((choice_name)&&(choice_name != 'tree_tcid')) {
       query += '&choice_name='+choice_name
    }
    return expand_tree('coloursubtree', treeid, base_treeNG_url+'/get_html_tcid_subtree', query, 0)
}

function reduce_org_tree(treeid, unique_prefix) {
    if (!unique_prefix) unique_prefix=''; 
    return reduce_tree('orgsubtree', unique_prefix+treeid)
}

function reduce_net_tree(treeid, unique_prefix) {
    if (!unique_prefix) unique_prefix=''; 
    return reduce_tree('netsubtree', unique_prefix+treeid)
}

function reduce_colour_tree(treeid) {
    return reduce_tree('coloursubtree', treeid)
}

function set_subtree(treename, parent_id, html_subtree) {
    el = GetElementById(treename+parent_id)
    SetInnerHTML(el, html_subtree)
    GetElementById('exp'+parent_id).style.display = 'none'
    GetElementById('red'+parent_id).style.display = 'inline' 
    unset_max_height(el)
}

function set_org_subtree(parent_id, html_subtree) {
    return set_subtree('orgsubtree', parent_id, html_subtree)
}

function set_net_subtree(parent_id, html_subtree) {
    return set_subtree('netsubtree', parent_id, html_subtree)
}

function set_colour_subtree(parent_id, html_subtree) {
    return set_subtree('coloursubtree', parent_id, html_subtree)
}