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1 <!doctype html>
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2 <html lang="en">
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3 <head>
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4 <meta name="viewport" content="width=device-width, initial-scale=1">
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5 <style>
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6 @import "/site.css";
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7 @import "/dad.css";
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8
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9 [drop] {
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10 margin-top: 8px;
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11 margin-bottom: 8px;
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12 }
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13 [drag] {
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14 background-color: LightGreen;
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15 padding: 8px;
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16 display: inline-block;
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17 }
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18 </style>
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19 <script src="/dad.js"></script>
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20 <script>
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21 function indexOf(a,el) {
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22 for( let i=0; i<a.length; i++ ) {
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23 if( a[i] === el )
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24 return i;
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25 }
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26 return -1;
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27 }
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28
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29 dad.whatToDrag = function(draggable) {
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30 return draggable.parentNode;
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31 };
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32
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33 dad.onEnter = function(event) {
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34 let dropzone = event.dropzone;
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35 let original = event.original;
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36 let filter = original.getAttribute('drop');
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37 if( dropzone.getAttribute('drop') !== filter ) {
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38 return false;
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39 }
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40 let items = document.querySelectorAll(`[drop="${filter}"]`);
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41 let iDropzone = indexOf(items,dropzone);
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42 let iOriginal = indexOf(items,original);
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43 let where = iDropzone < iOriginal ? 'beforebegin' : 'afterend';
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44 dropzone.insertAdjacentElement(where,original);
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45 };
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46
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47 function init() {
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48 let items = document.querySelectorAll('[drop]');
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49 for( let item of items ) {
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50 dad.setDropzone(item);
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51 let filter = item.getAttribute('drop');
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52 let drag = item.querySelector(`[drag="${filter}"]`);
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53 dad.setDraggable(drag);
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54 }
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55 }
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56 </script>
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57 </head>
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58 <body>
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59 <h1>Nested Dynamic Lists</h1>
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60 <ul>
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61 <script>
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62 for( let i=1; i<=5; i++ ) {
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63 document.write(`
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64 <li drop="top">${i} - <span drag=top>drag me</span>
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65 <ul>
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66 ` );
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67 for( let j=1; j<=i; j++ ) {
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68 document.write(`
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69 <li drop="n${i}">${j} - <span drag="n${i}">drag me</span>
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70 ` );
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71 }
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72 document.write(`
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73 </ul>
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74 </li>
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75 ` );
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76 }
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77 </script>
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78 </ul>
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79 <p>bottom</p>
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80 </body>
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81 <script> init(); </script>
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82 </html>
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