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/* Any JavaScript here will be loaded for all users on every page load. */


function ddm() {
    // Variables, change these in case you need to set other class names (mmhide_ for
    // contribute users for example)
    var parentClass = 'isParent'; //gets applied when the LI has a nested UL
    var activeParentClass = 'isActive'; //gets applied when the nested UL is visible
    var preventHoverClass = 'nohover'; //denotes a navigation that should not get any hover effects
    var indicateJSClass = 'dhtml'; //gets applied to the main navigation when JavaScript is available
    var toHideClass = 'hiddenChild'; //gets applied to hide the nested UL
    var toShowClass = 'shownChild'; //gets applied to show the nested UL
    var currentClass = 'current'; //denotes the current active sub element and prevents collapsing
    var d = document.getElementById('nav'); //denotes the navigation element
    // if DOM is not available stop right here.
    if (!document.getElementById && !document.createTextNode) {
        return;
    }
    // if the navigation element is available, apply the class denoting DHTML capabilities
    if (d) {
        d.className += d.className == '' ? indicateJSClass : ' ' + indicateJSClass;
        var lis, i, firstUL, j, apply;
        // loop through all LIs and check which ones have a nested UL
        lis = d.getElementsByTagName('li');
        for (i = 0; i < lis.length; i++) {
            firstUL = lis[i].getElementsByTagName('ul')[0];
                // if there is a nested UL, deactivate the first nested link and apply the class to show
                // there is a nested list
            if (firstUL) {
                lis[i].childNodes[0].onclick = function() {
                    return false;
                };
                lis[i].className += lis[i].className == '' ? parentClass : ' ' + parentClass;
                // check if there is a "current" element
                apply = true;
                if (new RegExp('\\b' + currentClass + '\\b').test(lis[i].className)) {
                    apply = false;
                }
                if (apply) {
                    for (j = 0; j < firstUL.getElementsByTagName('li').length; j++) {
                        if (new RegExp('\\b' + currentClass + '\\b').test(firstUL.getElementsByTagName('li')[j].className)) {
                            apply = false;
                            break;
                        }
                    }
                }
                // if there is no current element, apply the class to hide the nested list
                if (apply) {
                    firstUL.className += firstUL.className == '' ? toHideClass : ' ' + toHideClass;
                    // check if there is a class to prevent hover effects and only apply the function
                    // onclick if that is the case, otherwise apply it onclick and onhover
                    if (new RegExp('\\b' + preventHoverClass + '\\b').test(d.className)) {
                        lis[i].onclick = function() {
                            doddm(this);
                        };
                    } else {
                        lis[i].onclick = function() {
                            doddm(this);
                        };
                        lis[i].onmouseover = function() {
                            doddm(this);
                        };
                        lis[i].onmouseout = function() {
                            doddm(null);
                        };
                    }
                    // if there is a current element, define the list as being kept open and apply the
                    // classes to show the nested list and define the parent LI as an active one
                } else {
                    lis[i].keepopen = 1;
                    firstUL.className += firstUL.className == '' ? toShowClass : ' ' + toShowClass;
                    lis[i].className = lis[i].className.replace(parentClass, activeParentClass);
                }
            }
        }
    }
    // function to show and hide the nested lists and add the classes to the parent LIs
    function doddm(o) {
        var childUL, isobj, swap;
        // loop through all LIs of the navigation     
        lis = d.getElementsByTagName('li');
        for (i = 0; i < lis.length; i++) {
            isobj = lis[i] == o;
            // function to exchange class names in an object
            swap = function(tmpobj, tmporg, tmprep) {
                tmpobj.className = tmpobj.className.replace(tmporg, tmprep);
            };
            // if the current LI does not have an indicator to be kept visible
            if (!lis[i].keepopen) {
                childUL = lis[i].getElementsByTagName('ul')[0];
                // check if there is a nested UL and if the current LI is not the one clicked on
                // and exchange the classes accordingly (ie. hide all other nested lists and
                // make the LIs parent rather than active.
                if (childUL) {
                    if (new RegExp('\\b' + preventHoverClass + '\\b').test(d.className)) {
                        if (new RegExp('\\b' + activeParentClass + '\\b').test(lis[i].className)) {
                            swap(childUL, isobj ? toShowClass : toHideClass, isobj ? toHideClass : toShowClass);
                            swap(lis[i], isobj ? activeParentClass : parentClass, isobj ? parentClass : activeParentClass);
                        } else {
                            swap(childUL, isobj ? toHideClass : toShowClass, isobj ? toShowClass : toHideClass);
                            swap(lis[i], isobj ? parentClass : activeParentClass, isobj ? activeParentClass : parentClass);
                        }
                    } else {
                        swap(childUL, isobj ? toHideClass : toShowClass, isobj ? toShowClass : toHideClass);
                        swap(lis[i], isobj ? parentClass : activeParentClass, isobj ? activeParentClass : parentClass);
                    }
                }
            }
        }
    }
}
window.onload = function() {
    ddm();
    // add other functions to be called onload below
};

Edição das 09h41min de 20 de julho de 2021
Disponível em “http://wiki.gla.com.br/index.php?title=MediaWiki:Common.js&oldid=860”