029.html (2334B)
1 <!doctype html> 2 <html> 3 <head> 4 <title>Drag and drop without cancelling dragenter</title> 5 <style type="text/css"> 6 div:first-child { 7 height: 100px; 8 width: 100px; 9 background: orange; 10 display: inline-block; 11 } 12 div:first-child + div { 13 height: 100px; 14 width: 100px; 15 background: blue; 16 display: inline-block; 17 } 18 </style> 19 <script type="text/javascript"> 20 21 window.onload = function () { 22 var drag = document.getElementsByTagName('div')[0], sequence = []; 23 drag.ondragstart = function (e) { 24 e.dataTransfer.setData('text','hello'); 25 e.dataTransfer.effectAllowed = 'copy'; 26 }; 27 drag.ondragenter = drag.ondragover = function (e) { 28 e.preventDefault(); 29 }; 30 var drop = document.getElementsByTagName('div')[1], dragoverhasfired = false; 31 drop.ondragenter = function (e) { 32 dragoverhasfired = true; //events targeting body will be ignored until this event has fired 33 sequence[sequence.length] = 'drop.dragenter'; 34 }; 35 drop.ondragover = function (e) { 36 e.preventDefault(); 37 if( sequence[sequence.length-1] != 'drop.dragover' ) { 38 sequence[sequence.length] = 'drop.dragover'; 39 } 40 }; 41 drop.ondrop = function (e) { 42 e.preventDefault(); 43 sequence[sequence.length] = 'drop.ondrop'; 44 }; 45 document.body.ondragenter = function (e) { 46 if( e.target != this ) { return; } 47 if( dragoverhasfired ) { 48 sequence[sequence.length] = 'body.dragenter'; 49 } 50 }; 51 document.body.ondragover = function (e) { 52 if( e.target != this ) { return; } 53 if( dragoverhasfired ) { 54 if( sequence[sequence.length-1] != 'body.dragover' ) { 55 sequence[sequence.length] = 'body.dragover'; 56 } 57 } 58 }; 59 drag.ondragend = function (e) { 60 sequence = sequence.join('=>') 61 var desiredsequence = (['drop.dragenter','body.dragenter','body.dragover']).join('=>') 62 if( sequence == desiredsequence ) { 63 document.getElementsByTagName('div')[2].innerHTML = 'PASS'; 64 } else { 65 document.getElementsByTagName('div')[2].innerHTML = 'FAIL, got:<br>'+sequence+'<br>instead of:<br>'+desiredsequence; 66 } 67 }; 68 }; 69 </script> 70 </head> 71 <body> 72 73 <div draggable="true"></div><div></div> 74 <div> </div> 75 <p>Drag the orange square onto the blue square and release it.</p> 76 <noscript><p>Enable JavaScript and reload</p></noscript> 77 78 </body> 79 </html>