Saya menggunakan contoh di sini https://codepen.io/ac_coding/pen/wMmKgb untuk mencipta menu yang boleh dilipat, tetapi saya mahu menu itu runtuh sepenuhnya apabila dibuka.

Saya cuba menambah beberapa perubahan pada Javascript seperti

$('toggleClass').click()

Tetapi setakat ini saya tidak bernasib baik.

Javascript sukar difahami kerana saya sangat baru menggunakannya.

Sebarang bantuan tentang cara saya boleh memastikan halaman dibuka dan semua pilihan diruntuhkan akan sangat dihargai.

Terima kasih banyak-banyak terlebih dahulu.

/*
    THIS CODE WILL HELP (IT'S NECESSARY) TO CREATE THE "FLOWCHART VIEW" STYLE
    ON THE LIST WITH "FLOWCHART" STYLE SELECTED.
*/
$(document).ready(function(){

    // THIS FUNCTION ALLOW IE TO DEAL WITH "GET ELEMENTS BY CLASS NAME"
    function getElementsByClassName(node, classname) {
        var a = [];
        var re = new RegExp('(^| )'+classname+'( |$)');
        var els = node.getElementsByTagName("*");
        for(var i=0,j=els.length; i<j; i++)
            if(re.test(els[i].className))a.push(els[i]);
        return a;
    }

    // this variable will just check if we are on a template with a flowchart inside.
    var flowcharts = getElementsByClassName(document.body,'flowchart');  // no document
    
    // IN CASE THERE IS A FLOWCHART LIST, THE FUN WILL START
    if($(flowcharts).html() != undefined){
    // FIRSTLY IT'S COUNTED HOW MANY FLOWCHART ARE THERE
    for(var m = 0; m < flowcharts.length; m++){
            var tempFlowchart = flowcharts[m];
            var collapseOption = ''; // THIS VARIABLE WILL BE USED AS A SETTING TO FOLD OR NOT THE FLOWCHART
            
            // UMBRACO RETURN THE TEXT INSIDE "LI" WITHOUT "P", SO WE NEED TO GET ALL OF THEM AND MAKE IT PROPERLY
            var paragraphsList = tempFlowchart.getElementsByTagName('li');
            for(var i = 0; i < paragraphsList.length; i++){
                var tempParagraph = paragraphsList[i];
                
                // NEXT CONDITION WILL LOOK FOR THE SETTING TO FOLD OR UNFOLD THE FLOWCHART
                if(collapseOption === ''){
                // IF THE WORD COLLAPSE IS IN THE FIRST PARAGRAPH BETWEEN '*' ...
                var settingsRemoved = $(tempParagraph).html(),
                    settings = settingsRemoved.split('*');
                // ...WE TAKE IT OUT FROM THE TEXT, AND SAVE IT FOR LATER IN A VARIABLE
                collapseOption = settings[1];
                // THE ORIGINAL HTML IS OVERWRITTEN WITH THE NEW ONE, WITHOUT "COLLAPSE" ON IT
                $(tempParagraph).html(settings[2]);
                }
                
                // THIS FUNCTION WILL CUT OUT ANY TEXT BETWEEN [ AND ], AND IT WILL BE ADDED AS "TITLE" TO THE PARAGRAPH
                var html = $(tempParagraph).html(),
                    lText = html.split('['),
                    rText = html.split(']');
                    
                if (typeof rText[0] === "undefined")
                    {rText[0] = ""}  
                if (typeof rText[1] === "undefined")
                    {rText[1] = ""}  
                if (typeof lText[0] === "undefined")
                    {lText[0] = ""} 
                if (typeof lText[1] === "undefined")
                    {lText[1] = ""}
                    
                var titleText = lText[1].split(']');
                $(tempParagraph).attr({ title: titleText[0] });
                $(tempParagraph).html(lText[0]+rText[1]);
                
                var finalParagraph = $(tempParagraph).html();
                
                // IF THERE IS NOT CHILDS, IN WON'T HAVE FOLDED MENU ICON
                if($(tempParagraph).next('ul').text() == ''){
                    $(tempParagraph).text('');
                    if($(tempParagraph).parent().prop("class") === 'flowchart'){
                        $(tempParagraph).append("<p class='finalLink firstLevel'>"+ finalParagraph +"</p>");
                    }else if($(tempParagraph).parent().parent().prop("class") === 'flowchart'){
                        $(tempParagraph).append("<p class='finalLink secondLevel'>"+ finalParagraph +"</p>");
                    }else{
                        $(tempParagraph).append("<p class='finalLink thirstLevel'>"+ finalParagraph +"</p>");
                    }
                }else // IT WILL HAVE FOLDED MENU ICON IF THERE IS CHILDS
                {
                    $(tempParagraph).text('');
                    if(collapseOption =="collapse"){
                        $(tempParagraph).append("<div class='menuBox'><span class='notclicked'></span></div><p>"+ finalParagraph +"</p>");
                    }else{
                        $(tempParagraph).append("<div class='unfoldArrow'></div><p>"+ finalParagraph +"</p>");
                    }
                }
            };
            
            // WITH THE NEXT CLASSES WE WILL ADD A LINE AT LEFT SIDE IN CASE THERE IS MORE SECTIONS IN THE SAME LEVEL
            var list = tempFlowchart.getElementsByTagName('ul');
            for(var i = 0; i < list.length; i++){
                var temp = list[i];
                if($(temp).next('li').text() != ''){
                    // LONGER WILL ADD THE LINE
                   $(temp).addClass('longer');
                }else{
                    // SHORT WON'T ADD THE LINE
                    $(temp).addClass('short');
                }
            }
            
                // CREATE A NEW DIV WITH A CLASS CALLED "FLOWCHART"
            $(tempFlowchart).before("<div class='flowchart flowchartSerial_" + (m+1) + "'></div>");
                // SAVE THE CONTENT OF OUR NEW DIV
            var flowChartDiv = $('div.flowchartSerial_'+ (m+1));
            $(flowChartDiv).append($(tempFlowchart));
            
            // IF 'COLLAPSE' WAS WRITTEN AT THE BEGINNIG OF THE FLOWCHART, IT WILL BE COLLAPSED
            if(collapseOption == "collapse"){
                $(flowChartDiv).children('ul').children('ul').addClass('opened');
                $(flowChartDiv).children('ul').children('ul').slideToggle(350);
                $(flowChartDiv).children('ul').children('li').children('.menuBox').children('span').toggleClass("clicked");
                $(flowChartDiv).children('ul').children('li').children('.menuBox').children('span').toggleClass("notclicked");
                flowchartSlideTest(flowChartDiv);
            // OTHERWISE, IT WILL BE NO COLLAPSED
            }else{
                // THE CLASSES LONGER AND SHORT HAVE A DISPLAY:NONE PROPERTY
                // SO THIS WILL OVERWRITE THAT PROPERTIES AND WILL EXPAND ALL
                $(flowChartDiv).find('.longer').show();
                $(flowChartDiv).find('.short').show();
            }
        }
    }
});

function flowchartSlideTest(variable){

$(variable).find('.menuBox').click(function(event){
    var div = $(this).parent('li').next('ul');
    
    if($(div).html() != undefined){
        var open = $(variable).children('ul').children('ul').find('.opened');
        // IF WE OPENED ANOTHER SECTION BEFORE, IT WILL BE CLOSED BEFORE OPENING THE NEW ONE
        if($(open).html() != $(div).html()){
            if(!$(this).parent().parent().hasClass('opened')){
                $(open).each(function() {
                $(this).toggleClass("opened");
                $(this).slideToggle(350);
                $(this).prev('li').children().children().toggleClass("clicked");
                $(this).prev('li').children().children().toggleClass("notclicked");
            });
            }
        }
        
        $(div).each(function(i) {
            $(div).slideToggle(350);
            $(div).toggleClass("opened");
        });
        
        $(this).children().toggleClass("clicked");
        $(this).children().toggleClass("notclicked");
    };

$(variable).children('ul').children('ul').removeClass('opened');
});
};

.flowchart{width: 500px;margin:0 auto 15px;}
.flowchart .longer{
/*  border-left:1px solid #C5C5C5; */
    padding-left: 15%;
    margin-left: -15px /*!important*/;
    display:none;
}
.flowchart .short{
    padding-left: 15%;
    margin-left: -15px /*!important*/;
    display:none;
}
.flowchart p, .flowchart a, .flowchart li, .flowchart span{color:#fff !important;*color:#000;text-align:left;text-decoration: none;text-decoration: none !important;border-bottom:none !important;}
.flowchart ul{list-style:none;margin: 0;padding: 0;}
.flowchart ul li{margin-top: 10px;}
.flowchart ul li p{margin:0;padding: 5px;padding-left: 30px;background: #f47321;}
.flowchart ul li ul li p{background: #A8B2BB;}
.flowchart ul ul{margin-left: 70px;}
.flowchart ul ul li{
    border-left:1px solid #C5C5C5;
    margin: 0 0 0 -15px;
    padding: 8px 0 0 15px;
}
.flowchart ul ul li:after{
    content: "-";
    color: #fff;
    float: left;
    margin-left: -16px;
    margin-top: -21px;
    border-left: 1px solid #C5C5C5;
    border-bottom: 1px solid #C5C5C5;
    padding-right: 10px;
}
.flowchart ul ul li p{background:#7686c2;}
.flowchart ul ul ul{margin-left: 15%;}
.flowchart .short ul ul ul ul ul ul ul ul, .flowchart .longer ul ul ul ul ul ul ul ul{padding-left: 40px;}

/** COMPARE LATER WITH MENUBOX OF SIDENAV **/
.flowchart .menuBox{
cursor: pointer;
width: 18px;
float: left;
height: 22px;
margin-left: 6px; /* IE8 and below */
margin-top:3px;
}
.flowchart .unfoldArrow{
    width: 18px;
    float: left;
    height: 22px;
    margin-left: 6px;
    background: url(/images/sidebarMenu/downMenu-arrow-white.gif) no-repeat 9px 4px;
}
.flowchart .finalLink{
background-image: url(/images/sidebarMenu/menu-arrow-white.gif);
background-repeat: no-repeat;
background-position:9px 4px;
}
.flowchart .firstLevel{
background-color:#f47321;
}
.flowchart .secondLevel{
background-color:#7686c2;
}
.flowchart .thirstLevel{
background-color:#98a2d2;
}
.flowchart span {
margin-top: -2px;
display: list-item;
-webkit-box-shadow: 0 10px 0 1px #fff, 0 16px 0 1px #fff, 0 22px 0 1px #fff;
box-shadow: 0 10px 0 1px #fff, 0 16px 0 1px #fff, 0 22px 0 1px #fff;
    
background:url(/images/sidebarMenu/menu_icon_for_IE.gif) no-repeat; /* IE8 and below */
margin-top: 3px; /* IE8 and below */
height:16px; /* IE8 and below */
}
.flowchart .clicked{
    margin-left: 9px;
    width: 1px;
    -webkit-transition: width 0.2s ease-out, margin-left 0.2s ease-out;
    -moz-transition: width 0.2s ease-out, margin-left 0.2s ease-out;
    -o-transition: width 0.2s ease-out, margin-left 0.2s ease-out;
    -ms-transition: width 0.2s ease-out, margin-left 0.2s ease-out;
    transition: width 0.2s ease-out, margin-left 0.2s ease-out;
    
    margin-left: 8px; /* IE8 and below */
    width: 4px; /* IE8 and below */
}
.flowchart .notclicked{
    width: 16px;
    -webkit-transition: width 0.2s ease-out, margin-left 0.2s ease-out;
    -moz-transition: width 0.2s ease-out, margin-left 0.2s ease-out;
    -o-transition: width 0.2s ease-out, margin-left 0.2s ease-out;
    -ms-transition: width 0.2s ease-out, margin-left 0.2s ease-out;
    transition: width 0.2s ease-out, margin-left 0.2s ease-out;
    
    width:20px; /* IE8 and below */
    height:16px; /* IE8 and below */
}

<script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/3.3.1/jquery.min.js"></script>
<ul class="flowchart">
<li>*collapse*Element 01 (level 01)</li>
<ul>
<li>Child 01 of Element 01 (level 02)</li>
</ul>
<li>Element 02 (level 01)</li>
<ul>
<li>Child 01 of Element 02 (level 02)</li>
<ul>
<li>Child of Element 02 (level 03)</li>
<ul>
<li>Child of Element 02 (level 04)</li>
</ul>
</ul>
<li>Child 02 of Element 02 (level 02)</li>
</ul>
<li>Element 03 (level 01)</li>
</ul>