Add type="button" to expand buttons to prevent form submission

Resolves #31.

Author: jakezatecky

CHANGELOG.md

@@ -1,5 +1,11 @@
 # CHANGELOG
 
+## v0.5.2 (TBD)
+
+### Bug Fixes
+
+* [#31]: Fix issue where expand buttons would submit a parent form
+
 ## [v0.5.1](https://github.com/jakezatecky/react-checkbox-tree/compare/v0.5.0...v0.5.1) (2017-03-21)
 
 ### New Features

src/js/TreeNode.js

@@ -82,7 +82,13 @@ class TreeNode extends React.Component {
 		}
 
 		return (
-			<button aria-label="Toggle" className="rct-collapse rct-collapse-btn" title="Toggle" onClick={this.onExpand}>
+			<button
+				aria-label="Toggle"
+				className="rct-collapse rct-collapse-btn"
+				title="Toggle"
+				type="button"
+				onClick={this.onExpand}
+			>
 				{this.renderCollapseIcon()}
 			</button>
 		);