Created
June 2, 2022 04:38
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browser event
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| <!DOCTYPE html> | |
| <html> | |
| <head> | |
| <title>Browser events</title> | |
| </head> | |
| <body> | |
| <div> | |
| https://mdn.github.io/learning-area/javascript/building-blocks/events/show-video-box.html | |
| <button>Click me</button> | |
| </div> | |
| <script> | |
| function logEvent(event) { | |
| const eventPhase = event.eventPhase; | |
| const targetName = event.currentTarget?.tagName || event.currentTarget; | |
| console.log(`[${eventPhase}:${targetName}] ${event.type} on ${event.target.tagName}`); | |
| } | |
| const EVENT_TYPE = "click"; | |
| // capturing phase | |
| window.addEventListener(EVENT_TYPE, logEvent, {capture: true}); | |
| document.addEventListener(EVENT_TYPE, logEvent, {capture: true}); | |
| document.querySelector("html").addEventListener(EVENT_TYPE, logEvent, {capture: true}); | |
| document.body.addEventListener(EVENT_TYPE, logEvent, {capture: true}); | |
| document.querySelector("div").addEventListener(EVENT_TYPE, logEvent, {capture: true}); | |
| document.querySelector("button").addEventListener(EVENT_TYPE, logEvent, {capture: true}); | |
| // bubbling phase | |
| window.addEventListener(EVENT_TYPE, logEvent); | |
| document.addEventListener(EVENT_TYPE, logEvent); | |
| document.querySelector("html").addEventListener(EVENT_TYPE, logEvent); | |
| document.body.addEventListener(EVENT_TYPE, logEvent); | |
| document.querySelector("div").addEventListener(EVENT_TYPE, logEvent); | |
| document.querySelector("button").addEventListener(EVENT_TYPE, logEvent); | |
| </script> | |
| </body> | |
| </html> |
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