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Consider a KeyDown event listener attached to two elements, a <body> and some child <table> ("Current Targets"), and the KeyDown event fired by a key press on a <td> element (the "Target"). If this key down event deletes the contents of the table, then the <td> element no longer exists. The browser, however has processed the <body> event listener before the delete has happened in the APLDOM and the browser DOM synchronized. So when the <body> event listener is sent to the APLDOM, the expected <td> target element is not found.
In the use-case that uncovered this issue, in the higher level event handler, the target is immaterial and unreferenced anyway. This may virtually always be the case. If a lower level event handler is deleting elements, an upper level event handler should not reference them. It may be safe to simply set target to zero if not found.
The text was updated successfully, but these errors were encountered:
Consider a KeyDown event listener attached to two elements, a
<body>and some child<table>("Current Targets"), and the KeyDown event fired by a key press on a<td>element (the "Target"). If this key down event deletes the contents of the table, then the<td>element no longer exists. The browser, however has processed the<body>event listener before the delete has happened in the APLDOM and the browser DOM synchronized. So when the<body>event listener is sent to the APLDOM, the expected<td>target element is not found.In the use-case that uncovered this issue, in the higher level event handler, the target is immaterial and unreferenced anyway. This may virtually always be the case. If a lower level event handler is deleting elements, an upper level event handler should not reference them. It may be safe to simply set target to zero if not found.
The text was updated successfully, but these errors were encountered: