Merge pull request #30 from 30-seconds/limited-word-textarea

add limited word text area

snippets/LimitedWordTextarea.md

@@ -0,0 +1,61 @@
+### LimitedWordTextarea
+
+Renders a textarea component with a word limit.
+
+Use the `React.useState()` hook to create the `content` and `wordCount` state variables and set their values to `value` and `0` respectively.
+Create a method `setFormattedContent`, which uses `String.prototype.split(' ')` to turn the input into an array of words and check if the result of applying `Array.prototype.filter(Boolean)` has a `length` longer than `limit`.
+If the afforementioned `length` exceeds the `limit`, trim the input, otherwise return the raw input, updating `content` and `wordCount` accordingly in both cases.
+Use the `React.useEffect()` hook to call the `setFormattedContent` method on the value of the `content` state variable.
+Use a`<div>` to wrap both the`<textarea>` and the `<p>` element that displays the character count and bind the `onChange` event of the `<textarea>` to call `setFormattedContent` with the value of `event.target.value`.
+
+```jsx
+function LimitedWordTextarea({ rows, cols, value, limit }) {
+  const [content, setContent] = React.useState(value);
+  const [wordCount, setWordCount] = React.useState(0);
+
+  const setFormattedContent = text => {
+    let words = text.split(" ");
+    if (words.filter(Boolean).length > limit) {
+      setContent(
+        text
+          .split(" ")
+          .slice(0, limit)
+          .join(" ")
+      );
+      setWordCount(limit);
+    } else {
+      setContent(text);
+      setWordCount(words.filter(Boolean).length);
+    }
+  };
+
+  React.useEffect(() => {
+    setFormattedContent(content);
+  }, []);
+
+  return (
+    <div>
+      <textarea
+        rows={rows}
+        cols={cols}
+        onChange={event => setFormattedContent(event.target.value)}
+        value={content}
+      />
+      <p>
+        {wordCount}/{limit}
+      </p>
+    </div>
+  );
+}
+```
+
+```jsx
+ReactDOM.render(
+  <LimitedWordTextArea limit={5} value='Hello there!' />,
+  document.getElementById('root')
+);
+```
+<!-- tags: input,state,effect -->
+
+<!-- expertise: 0 -->
+