| <!doctype html> |
| <html> |
| <head> |
| <title>Drag and drop without cancelling dragenter</title> |
| <style type="text/css"> |
| div:first-child { |
| height: 100px; |
| width: 100px; |
| background: orange; |
| display: inline-block; |
| } |
| div:first-child + div { |
| height: 100px; |
| width: 100px; |
| background: blue; |
| display: inline-block; |
| } |
| </style> |
| <script type="text/javascript"> |
| |
| window.onload = function () { |
| var drag = document.getElementsByTagName('div')[0], sequence = []; |
| drag.ondragstart = function (e) { |
| e.dataTransfer.setData('text','hello'); |
| e.dataTransfer.effectAllowed = 'copy'; |
| }; |
| drag.ondragenter = drag.ondragover = function (e) { |
| e.preventDefault(); |
| }; |
| var drop = document.getElementsByTagName('div')[1], dragoverhasfired = false; |
| drop.ondragenter = function (e) { |
| dragoverhasfired = true; //events targeting body will be ignored until this event has fired |
| sequence[sequence.length] = 'drop.dragenter'; |
| }; |
| drop.ondragover = function (e) { |
| e.preventDefault(); |
| if( sequence[sequence.length-1] != 'drop.dragover' ) { |
| sequence[sequence.length] = 'drop.dragover'; |
| } |
| }; |
| drop.ondrop = function (e) { |
| e.preventDefault(); |
| sequence[sequence.length] = 'drop.ondrop'; |
| }; |
| document.body.ondragenter = function (e) { |
| if( e.target != this ) { return; } |
| if( dragoverhasfired ) { |
| sequence[sequence.length] = 'body.dragenter'; |
| } |
| }; |
| document.body.ondragover = function (e) { |
| if( e.target != this ) { return; } |
| if( dragoverhasfired ) { |
| if( sequence[sequence.length-1] != 'body.dragover' ) { |
| sequence[sequence.length] = 'body.dragover'; |
| } |
| } |
| }; |
| drag.ondragend = function (e) { |
| sequence = sequence.join('=>') |
| var desiredsequence = (['drop.dragenter','body.dragenter','body.dragover']).join('=>') |
| if( sequence == desiredsequence ) { |
| document.getElementsByTagName('div')[2].innerHTML = 'PASS'; |
| } else { |
| document.getElementsByTagName('div')[2].innerHTML = 'FAIL, got:<br>'+sequence+'<br>instead of:<br>'+desiredsequence; |
| } |
| }; |
| }; |
| </script> |
| </head> |
| <body> |
| |
| <div draggable="true"></div><div></div> |
| <div> </div> |
| <p>Drag the orange square onto the blue square and release it.</p> |
| <noscript><p>Enable JavaScript and reload</p></noscript> |
| |
| </body> |
| </html> |