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JavaScript Need Help With Tree View Actions

D

ds_tx

Coder
I have a Tree View created with HTML and CSS based on design from W3 Schools that I use in MediaWiki for Page navigation.
I load Tree View on Pages from a MediaWiki Template.
Javascript for Tree View is copied to MediaWiki:Common.js that loads for every Page.

By default, Tree View is closed when loaded on Page, and must be manually opened to active page, which is bold.
Is there a way to modify Javascript so that on Page load, Tree View opens to location of active Page within Tree View?
 
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Using the example on W3Schools, because you didn't give us code, I just added
Code: 
for (i = 0; i < toggler.length; i++) {
toggler[i].parentElement.querySelector(".nested").classList.toggle("active");
toggler[i].classList.toggle("caret-down");
};

So the whole page would be:
Code: 
<!DOCTYPE html>
<html>
<head>
<meta name="viewport" content="width=device-width, initial-scale=1">
<style>
ul, #myUL {
list-style-type: none;
}
#myUL {
margin: 0;
padding: 0;
}
.caret {
cursor: pointer;
-webkit-user-select: none; /* Safari 3.1+ */
-moz-user-select: none; /* Firefox 2+ */
-ms-user-select: none; /* IE 10+ */
user-select: none;
}
.caret::before {
content: "\25B6";
color: black;
display: inline-block;
margin-right: 6px;
}
.caret-down::before {
-ms-transform: rotate(90deg); /* IE 9 */
-webkit-transform: rotate(90deg); /* Safari */'
transform: rotate(90deg); 
}
.nested {
display: none;
}
.active {
display: block;
}
</style>
</head>
<element onload="myScript">
<h2>Tree View</h2>
<p>A tree view represents a hierarchical view of information, where each item can have a number of subitems.</p>
<p>Click on the arrow(s) to open or close the tree branches.</p>
<ul id="myUL">
<li><span class="caret">Beverages</span>
<ul class="nested">
    <li>Water</li>
    <li>Coffee</li>
    <li><span class="caret">Tea</span>
    <ul class="nested">
        <li>Black Tea</li>
        <li>White Tea</li>
        <li><span class="caret">Green Tea</span>
        <ul class="nested">
            <li>Sencha</li>
            <li>Gyokuro</li>
            <li>Matcha</li>
            <li>Pi Lo Chun</li>
        </ul>
        </li>
    </ul>
    </li> 
</ul>
</li>
</ul>
<script>
var toggler = document.getElementsByClassName("caret");
var i;
for (i = 0; i < toggler.length; i++) {
toggler[i].addEventListener("click", function() {
this.parentElement.querySelector(".nested").classList.toggle("active");
this.classList.toggle("caret-down");
});
}
for (i = 0; i < toggler.length; i++) {
toggler[i].parentElement.querySelector(".nested").classList.toggle("active");
toggler[i].classList.toggle("caret-down");
};
</script>
</body>
</html>
 
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That forces Tree View completely open, each and every category, subcategory, etc. on each and every page.
You said you added JS, so I added your JS in addition to W3Schools JS.
I also replaced W3Schools JS with your JS, but both work the same - completely expand Tree View from top to bottom category.

ALSO - Carats completely disappear, so there's no way to open close categories, subcategories, etc.
I tried removing CSS but could never identify exactly what was causing isssue.
I put W3Schools code back the way it was, and it works now, but would like a way for users to know where in the Tree they are.

Here's what I'm looking for if possible (See W3Schools example) -

Beverages page opens with Beverages menu NOT expanded and Beverages active (bold, that's the way it is now).

Beverages menu expands to Beverages > Water Coffee Tea
Clicking on Coffee opens Coffee page with Beverages menu expanded only to subcategories Beverages > Water Coffee Tea with Coffee active (bolded)

From Coffee page, Tea subcategory exands to Beverages > Water Coffee Tea > BlackTea WhiteTea GreenTea
Clicking on Black Tea opens Black Tea page with menu expanded Beverages > Water Coffee Tea > BlackTea WhiteTea GreenTea, with BlackTea active (bolded)

Expanding Green Tea and clicking on Matcha opens Matcha page with Beverages menu expanded - Beverages > Water Coffee Tea > BlackTea WhiteTea GreenTea > Sencha Gyokuro Matcha PiLoChun with Matcha active (bolded)
 
Last edited:
Upvote 0 Downvote
The problem may be with the Script.
MediaWiki does not work with Body and Head HTML or Script tags.
I can only call a Template (like a php include so to speak) and Javascript.
My Template loads DIV with the nested list.
I can add JS to Common.js page/file that will load JS for every page.
And CSS to Common.css page/file that loads CSS for every page.
That's it.
 
Upvote 0 Downvote

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