From deb180d153147f1345d4038dd83337624e9a8e18 Mon Sep 17 00:00:00 2001
From: osito_wang <wangren0518@outlook.com>
Date: Mon, 13 May 2019 20:34:17 -0400
Subject: [PATCH] add click inside and click outside snippet

---
 snippets/ClickOutAndInside.md | 73 +++++++++++++++++++++++++++++++++++
 1 file changed, 73 insertions(+)
 create mode 100644 snippets/ClickOutAndInside.md

diff --git a/snippets/ClickOutAndInside.md b/snippets/ClickOutAndInside.md
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+### ClickInside and ClickOutside
+
+Two handy hooks to handle the click outside and inside event on the wrapped component.
+
+* Create customized hooks that take in a `ref` component(node) and a `callback` function to hanlde the customized `click` event
+* Use the `React.useEffect()` hook to append and clean up the `click` event.
+* Use the `React.useRef()` hook to create a `ref` for your click component and pass it to `useClickInside` and `useClickOutside` hooks.
+
+```css
+.click-box {
+  border: 2px dashed orangered;
+  height: 200px;
+  width: 400px;
+  display: flex;
+  justify-content: center;
+  align-items: center;
+}
+
+p {
+  border: 2px solid blue;
+  padding: 16px;
+}
+```
+
+```jsx
+const useClickInside = (ref, callback) => {
+  const handleClick = e => {
+    //use the node contains to verify if we click inside
+    if (ref.current && ref.current.contains(e.target)) {
+      callback();
+    }
+  };
+
+  //clean up using useEffect
+  useEffect(() => {
+    document.addEventListener("click", handleClick);
+    return () => {
+      document.removeEventListener("click", handleClick);
+    };
+  });
+};
+
+const useClickOutside = (ref, callback) => {
+  const handleClick = e => {
+    //use the node contains to verify if we click outside
+    if (ref.current && !ref.current.contains(e.target)) {
+      callback();
+    }
+  };
+  // clean up using useEffect
+  useEffect(() => {
+    document.addEventListener("click", handleClick);
+    return () => {
+      document.removeEventListener("click", handleClick);
+    };
+  });
+};
+
+function ClickBox({onClickOutside,onClickInside}) {
+  const clickRef = useRef();
+  useClickOutside(clickRef, onClickOutside);
+  useClickInside(clickRef, onClickInside);
+  return (
+    <div className="click-box" ref={clickRef}>
+      <p>Hello Click Me Inside!</p>
+    </div>
+  );
+}
+```
+
+```jsx
+ReactDOM.render(<ClickBox onClickOutside={()=> alert("click outside")} onClickInside={()=> alert("click inside")}/>,document.getElementById('root'))
+```
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