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JavaScriptでcallback functionの中で発生したエラーを外から捕捉する
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| <!DOCTYPE html> | |
| <html> | |
| <head> | |
| <meta charset="utf-8"> | |
| <meta name="viewport" content="width=device-width"> | |
| <title>Promiseの中のエラーを拾う</title> | |
| </head> | |
| <body> | |
| <button id="error-propagated-by-event">DOM Eventで伝播</button> | |
| <button id="error-propagated-by-callback">Errorハンドラで伝播</button> | |
| <script> | |
| const btnEvent = document.getElementById('error-propagated-by-event') | |
| btnEvent.addEventListener('click', (ev) => { | |
| try { | |
| clickHandlerWithDOM(ev.target) | |
| } catch (e) { | |
| console.error(['caught by try-catch', e]) | |
| } | |
| }) | |
| btnEvent.addEventListener('error', (ev) => { | |
| console.error(['caught by DOM Event', ev.detail]) | |
| }) | |
| function clickHandlerWithDOM (ele) { | |
| processWithDOM(ele) | |
| } | |
| function processWithDOM (ele) { | |
| setTimeout(() => { | |
| try { | |
| Foo | |
| } catch (err) { | |
| ele.dispatchEvent(new CustomEvent('error', { detail: err })) | |
| } | |
| }, 0) | |
| } | |
| // | |
| const btnHandler = document.getElementById('error-propagated-by-callback') | |
| btnHandler.addEventListener('click', (ev) => { | |
| try { | |
| clickHandlerWithCallback() | |
| } catch (e) { | |
| console.error(['caught by try-catch', e]) | |
| } | |
| }) | |
| function clickHandlerWithCallback (e) { | |
| processWithCallback(errorHandler) | |
| } | |
| function processWithCallback (handler) { | |
| setTimeout(() => { | |
| try { | |
| Foo | |
| } catch (err) { | |
| handler(err) | |
| } | |
| }, 0) | |
| } | |
| function errorHandler (err) { | |
| console.error(['caught by Handler callback', err]) | |
| } | |
| </script> | |
| </body> | |
| </html> |
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