| <!doctype html> |
| <html> |
| <head> |
| <title>Drag and drop without cancelling dragenter on body</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; |
| margin-left: 100px; |
| background: blue; |
| display: inline-block; |
| } |
| </style> |
| <script type="text/javascript"> |
| //If dragenter is cancelled the body should then become the target element, receiving both a dragenter and a dragover event. |
| //When the body is the actual immediate user selection (first time over the body), that means it gets *2* dragenter events |
| //Then when a div becomes immediate user selection (blue) but does not cancel the dragenter event, dragenter does not need |
| //to fire on body because body is already the current target element |
| //Then when the body is the actual immediate user selection again (second time over the body), it is already the current |
| //target element, so does not get a dragenter event |
| window.onload = function () { |
| var drag = document.getElementsByTagName('div')[0], beforecount = 0, aftercount = 0, switchcount = false; |
| drag.ondragstart = function (e) { |
| e.dataTransfer.setData('text','hello'); |
| e.dataTransfer.effectAllowed = 'copy'; |
| }; |
| drag.ondragenter = drag.ondrop = drag.ondragover = function (e) { |
| e.preventDefault(); |
| }; |
| var drop = document.getElementsByTagName('div')[1]; |
| drop.ondragenter = function (e) { |
| switchcount = true; |
| }; |
| drop.ondragover = function (e) { |
| e.preventDefault(); |
| }; |
| document.body.ondragenter = function (e) { |
| if( e.target != this ) { return; } |
| if( switchcount ) { aftercount++; } else { beforecount++; } |
| }; |
| drag.ondragend = function (e) { |
| document.getElementsByTagName('div')[2].innerHTML = ( beforecount == 2 && aftercount == 0 ) ? 'PASS' : ( 'FAIL, dragenter fired on body '+beforecount+' time(s) before blue.ondragenter and '+aftercount+' time(s) afterwards, instead of 2 and 0 times respectively' ); |
| }; |
| }; |
| </script> |
| </head> |
| <body> |
| |
| <div draggable="true"></div><div></div> |
| <div> </div> |
| <p>Drag the orange square onto the blue square, then back to the orange square, and release it.</p> |
| <noscript><p>Enable JavaScript and reload</p></noscript> |
| |
| </body> |
| </html> |