Created
October 20, 2018 22:56
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| // move all text into <span> | |
| // they occupy exactly the place necessary for the text, | |
| for (let li of tree.querySelectorAll('li')) { | |
| let span = document.createElement('span'); | |
| li.prepend(span); | |
| span.append(span.nextSibling); // move the text node into span | |
| } | |
| // catch clicks on whole tree | |
| tree.onclick = function(event) { | |
| if (event.target.tagName != 'SPAN') { | |
| return; | |
| } | |
| let childrenContainer = event.target.parentNode.querySelector('ul'); | |
| if (!childrenContainer) return; // no children | |
| childrenContainer.hidden = !childrenContainer.hidden; | |
| } |
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| <html> | |
| <head> | |
| <style> | |
| .tree span:hover { | |
| font-weight: bold; | |
| } | |
| .tree span { | |
| cursor: pointer; | |
| } | |
| </style> | |
| <meta charset="utf-8"> | |
| </head> | |
| <body> | |
| <ul class="tree" id="tree"> | |
| <li>Animals | |
| <ul> | |
| <li>Mammals | |
| <ul> | |
| <li>Cows</li> | |
| <li>Donkeys</li> | |
| <li>Dogs</li> | |
| <li>Tigers</li> | |
| </ul> | |
| </li> | |
| <li>Other | |
| <ul> | |
| <li>Snakes</li> | |
| <li>Birds</li> | |
| <li>Lizards</li> | |
| </ul> | |
| </li> | |
| </ul> | |
| </li> | |
| <li>Fishes | |
| <ul> | |
| <li>Aquarium | |
| <ul> | |
| <li>Guppy</li> | |
| <li>Angelfish</li> | |
| </ul> | |
| </li> | |
| <li>Sea | |
| <ul> | |
| <li>Sea trout</li> | |
| </ul> | |
| </li> | |
| </ul> | |
| </li> | |
| </ul> | |
| <script src='collapseTree.js'></script> | |
| </body> | |
| </html> |
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