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Add WeakRef and FinalizationRegistry article#3609
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483 changes: 483 additions & 0 deletions1-js/99-js-misc/07-weakref-finalizationregistry/article.md
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49 changes: 49 additions & 0 deletions1-js/99-js-misc/07-weakref-finalizationregistry/weakref-dom.view/index.css
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,49 @@ | ||
| .app { | ||
| display: flex; | ||
| flex-direction: column; | ||
| gap: 16px; | ||
| } | ||
| .start-messages { | ||
| width: fit-content; | ||
| } | ||
| .window { | ||
| width: 100%; | ||
| border: 2px solid #464154; | ||
| overflow: hidden; | ||
| } | ||
| .window__header { | ||
| position: sticky; | ||
| padding: 8px; | ||
| display: flex; | ||
| justify-content: space-between; | ||
| align-items: center; | ||
| background-color: #736e7e; | ||
| } | ||
| .window__title { | ||
| margin: 0; | ||
| font-size: 24px; | ||
| font-weight: 700; | ||
| color: white; | ||
| letter-spacing: 1px; | ||
| } | ||
| .window__button { | ||
| padding: 4px; | ||
| background: #4f495c; | ||
| outline: none; | ||
| border: 2px solid #464154; | ||
| color: white; | ||
| font-size: 16px; | ||
| cursor: pointer; | ||
| } | ||
| .window__body { | ||
| height: 250px; | ||
| padding: 16px; | ||
| overflow: scroll; | ||
| background-color: #736e7e33; | ||
| } |
28 changes: 28 additions & 0 deletions1-js/99-js-misc/07-weakref-finalizationregistry/weakref-dom.view/index.html
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,28 @@ | ||
| <!DOCTYPE HTML> | ||
| <html lang="en"> | ||
| <head> | ||
| <meta charset="utf-8"> | ||
| <link rel="stylesheet" href="index.css"> | ||
| <title>WeakRef DOM Logger</title> | ||
| </head> | ||
| <body> | ||
| <div class="app"> | ||
| <button class="start-messages">Start sending messages</button> | ||
| <div class="window"> | ||
| <div class="window__header"> | ||
| <p class="window__title">Messages:</p> | ||
| <button class="window__button">Close</button> | ||
| </div> | ||
| <div class="window__body"> | ||
| No messages. | ||
| </div> | ||
| </div> | ||
| </div> | ||
| <script type="module" src="index.js"></script> | ||
| </body> | ||
| </html> |
24 changes: 24 additions & 0 deletions1-js/99-js-misc/07-weakref-finalizationregistry/weakref-dom.view/index.js
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,24 @@ | ||
| const startMessagesBtn = document.querySelector('.start-messages'); // (1) | ||
| const closeWindowBtn = document.querySelector('.window__button'); // (2) | ||
| const windowElementRef = new WeakRef(document.querySelector(".window__body")); // (3) | ||
| startMessagesBtn.addEventListener('click', () => { // (4) | ||
| startMessages(windowElementRef); | ||
| startMessagesBtn.disabled = true; | ||
| }); | ||
| closeWindowBtn.addEventListener('click', () => document.querySelector(".window__body").remove()); // (5) | ||
| const startMessages = (element) => { | ||
| const timerId = setInterval(() => { // (6) | ||
| if (element.deref()) { // (7) | ||
| const payload = document.createElement("p"); | ||
| payload.textContent = `Message: System status OK: ${new Date().toLocaleTimeString()}`; | ||
| element.deref().append(payload); | ||
| } else { // (8) | ||
| alert("The element has been deleted."); // (9) | ||
| clearInterval(timerId); | ||
| } | ||
| }, 1000); | ||
| }; |
32 changes: 32 additions & 0 deletions.../99-js-misc/07-weakref-finalizationregistry/weakref-finalizationregistry-01.svg
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33 changes: 33 additions & 0 deletions.../99-js-misc/07-weakref-finalizationregistry/weakref-finalizationregistry-02.svg
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