This is the HTML code snippet:
<table id="bagua-table">
<tr>
<th colspan="3"><em>Bagua</em> Chart: Direction, Element, Color, Meaning</th>
</tr>
<tr>
<td class="nw"><strong>Northwest</strong>
<br>Metal
<br>Silver
<br>Elders
</td>
<td class="n"><strong>North</strong>
<br>Water
<br>Blue
<br>Change
</td>
<td class="ne"><strong>Northeast</strong>
<br>Earth
<br>Yellow
<br>Direction
</td>
</tr>
<tr>
<td class="w"><strong>West</strong>
<br>Metal
<br>Gold
<br>Youth
</td>
<td class="c"><strong>Center</strong>
<br>All
<br>Purple
<br>Harmony
</td>
<td class="e"><strong>East</strong>
<br>Wood
<br>Blue
<br>Future
</td>
</tr>
<tr>
<td class="sw"><strong>Southwest</strong>
<br>Earth
<br>Brown
<br>Tranquility
</td>
<td class="s"><strong>South</strong>
<br>Fire
<br>Orange
<br>Fame
</td>
<td class="se"><strong>Southeast</strong>
<br>Wood
<br>Green
<br>Romance
</td>
</tr>
In the script provided, when a cell in the table is clicked, it will be highlighted. If clicked again, the highlight will be removed. The selectedTd variable and the line containing target.parentNode play important roles in this functionality.
Here is the JavaScript code segment:
let table = document.getElementById('bagua-table');
let selectedTd;
table.onclick = function(event) {
let target = event.target;
while (target != this) {
if (target.tagName == 'TD') {
highlight(target);
return;
}
target = target.parentNode;
}
}
function highlight(node) {
if (selectedTd) {
selectedTd.classList.remove('highlight');
}
selectedTd = node;
selectedTd.classList.add('highlight');
}