| <!doctype html> |
| <html> |
| <head> |
| <title>Drag and drop without cancelling dragenter and without body or html</title> |
| <style type="text/css"> |
| body > div:first-child { |
| height: 100px; |
| width: 100px; |
| background: orange; |
| display: inline-block; |
| } |
| iframe { |
| height: 100px; |
| width: 100px; |
| margin-left: 100px; |
| display: inline-block; |
| border: none; |
| } |
| </style> |
| <script type="text/javascript"> |
| //Drag passes from parent to blue. Dragenter fires at blue. Root element is deleted. |
| //Dragenter is not cancelled. Body does not exist. Root element does not exist. |
| //Current target element is set to null. Drag now points at unrendered document - null. |
| //Current target element remains null. |
| //Drag passes over parent to orange. Dragenter fires at orange, and is cancelled. |
| window.onload = function () { |
| var orange = document.getElementsByTagName('div')[0], sequence = []; |
| orange.ondragstart = function (e) { |
| e.dataTransfer.setData('text','hello'); |
| e.dataTransfer.effectAllowed = 'copy'; |
| }; |
| orange.ondragenter = orange.ondrop = function (e) { |
| sequence[sequence.length] = 'orange.'+e.type; |
| e.preventDefault(); |
| }; |
| orange.ondragleave = function (e) { |
| sequence[sequence.length] = 'orange.dragleave'; |
| }; |
| orange.ondragover = function (e) { |
| if( sequence[sequence.length-1] != 'orange.dragover' ) { |
| sequence[sequence.length] = 'orange.dragover'; |
| } |
| e.preventDefault(); |
| }; |
| var blue = document.getElementsByTagName('iframe')[0].contentDocument; |
| if( !blue.documentElement ) { blue.appendChild(blue.createElement('html')); } |
| blue.documentElement.style.margin = '0'; |
| blue.documentElement.style.padding = '0'; |
| if( !blue.body ) { blue.documentElement.appendChild(blue.createElement('body')); } |
| blue.body.style.margin = '0'; |
| blue.body.style.padding = '0'; |
| var bluediv = blue.body.appendChild(blue.createElement('div')); |
| bluediv.style.height = '100px'; |
| bluediv.style.width = '100px'; |
| bluediv.style.background = 'blue'; |
| bluediv.ondragenter = bluediv.ondragover = function (e) { |
| sequence[sequence.length] = 'blue.'+e.type; |
| if( blue.documentElement ) { blue.removeChild(blue.documentElement); } |
| }; |
| blue.ondragenter = blue.ondragover = blue.ondragleave = function (e) { |
| if( e.target != this ) { return; } |
| sequence[sequence.length] = 'bluedocument.'+e.type; |
| }; |
| orange.ondragend = function (e) { |
| sequence = sequence.join('=>') |
| var desiredsequence = (['orange.dragenter','orange.dragover','orange.dragleave','blue.dragenter','orange.dragenter','orange.dragover','orange.drop']).join('=>') |
| if( sequence == desiredsequence ) { |
| document.getElementsByTagName('div')[1].innerHTML = 'PASS'; |
| } else { |
| document.getElementsByTagName('div')[1].innerHTML = 'FAIL, got:<br>'+sequence+'<br>instead of:<br>'+desiredsequence; |
| } |
| }; |
| }; |
| </script> |
| </head> |
| <body> |
| |
| <div draggable="true"></div><iframe src="about:blank"></iframe> |
| <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> |