add Setting Default Value

Author: Bunlong

_data/navigation.yml

@@ -114,6 +114,8 @@ docs:
     children:
       - title: "What is Uncontrolled Component?"
         url: /what-is-uncontrolled-component
+      - title: "Setting Default Value"
+        url: /set-default-value-uncontrolled-component
       # - title: "Installation"
       #   url: /install-create-react-app
       # - title: "Structure"

_docs/47-set-default-value-uncontrolled-component.md

@@ -0,0 +1,20 @@
+---
+title: "Setting Default Value"
+permalink: /set-default-value-uncontrolled-component
+excerpt: "Setting  Default Value - Learn React"
+last_modified_at: 2018-05-23T15:58:49-04:00
+---
+
+In the React rendering lifecycle, the value attribute on form elements will override the value in the DOM. 
+
+But with an uncontrolled component, to handle this case, you can specify a `defaultValue` attribute instead of value.
+
+For example below, I use `defaultValue` attribute to set default value of `<input>` form element:
+
+<p data-height="265" data-theme-id="0" data-slug-hash="rvgGrm" data-default-tab="js,result" data-user="Bunlong" data-embed-version="2" data-pen-title="rvgGrm" class="codepen">See the Pen <a href="https://codepen.io/Bunlong/pen/rvgGrm/">rvgGrm</a> by Bunlong (<a href="https://codepen.io/Bunlong">@Bunlong</a>) on <a href="https://codepen.io">CodePen</a>.</p>
+<script async src="https://static.codepen.io/assets/embed/ei.js"></script>
+
+Note:
+
+* `<input type="checkbox">` and `<input type="radio">` support `defaultChecked`.
+* `<select>` and `<textarea>` supports `defaultValue`.

_site/index.html

@@ -31,7 +31,7 @@
 
 
 
-  <meta property="article:published_time" content="2018-05-24T11:04:15+07:00">
+  <meta property="article:published_time" content="2018-05-24T13:59:22+07:00">
 
 
 
@@ -660,6 +660,14 @@
 
             <li><a href="/what-is-uncontrolled-component" class="">What is Uncontrolled Component?</a></li>
 
+            
+            
+
+            
+            
+
+            <li><a href="/set-default-value-uncontrolled-component" class="">Setting Default Value</a></li>
+          
         </ul>
 
       </li>

_site/sitemap.xml

@@ -189,6 +189,10 @@
 <lastmod>2018-05-24T02:58:49+07:00</lastmod>
 </url>
 <url>
+<loc>/set-default-value-uncontrolled-component</loc>
+<lastmod>2018-05-24T02:58:49+07:00</lastmod>
+</url>
+<url>
 <loc>/</loc>
 </url>
 </urlset>