[added] allow users to pass aria-* attribute.

This patch allows users to pass custom aria attributes
to be added to the modal content.

It accepts an object where the keys are the name of the attributes
without the prefix aria-*.

.eslintrc

@@ -28,6 +28,7 @@
     "react/no-find-dom-node": [0],
     "react/jsx-closing-bracket-location": [0],
     "react/jsx-filename-extension": ["error", {"extensions": [".js"]}],
+    "react/forbid-prop-types": [1, {"forbid": ["any"]}],
     "react/require-default-props": 0
   }
 }

README.md

@@ -76,6 +76,28 @@ Modal.setAppElement(appElement);
 Modal.setAppElement('#your-app-element');
 ```
 
+### Additional Aria Attributes
+
+Use the property `aria` to pass any additional aria attributes. It accepts
+an object where the keys are the names of the attributes without the prefix
+`aria-`.
+
+Example:
+
+```js
+<Modal
+  isOpen={modalIsOpen}
+  aria={{
+    labelledby: "heading",
+    describedby: "full_description"
+  }}>
+  <h1 id="heading">H1</h1>
+  <div id="full_description">
+    <p>Description goes here.</p>
+  </div>
+</Modal>
+```
+
 ## Styles
 
 Styles are passed as an object with 2 keys, 'overlay' and 'content' like so

docs/README.md

@@ -82,6 +82,13 @@ import ReactModal from 'react-modal';
     Function that will be called to get the parent element that the modal will be attached to.
   */
   parentSelector={() => document.body}
+  /*
+    Additional aria attributes (optional).
+  */
+  aria={{
+    labelledby: "heading",
+    describedby: "full_description"
+  }}
 />
 ```
 

examples/basic/app.js

@@ -69,12 +69,19 @@ class App extends Component {
         </Modal>
         <Modal ref="mymodal2"
                id="test2"
+               aria={{
+                 labelledby: "heading",
+                 describedby: "fulldescription"
+               }}
                closeTimeoutMS={150}
                contentLabel="modalB"
                isOpen={modal2}
                onAfterOpen={() => {}}
                onRequestClose={this.toggleModal_2}>
-          <p>test</p>
+          <h1 id="heading">This is the modal 2!</h1>
+          <div id="fulldescription" tabIndex="0" role="document">
+            <p>This is a description of what it does: nothing :)</p>
+          </div>
         </Modal>
       </div>
     );

specs/Modal.spec.js

@@ -239,7 +239,7 @@ describe('State', () => {
     unmountModal();
     expect(!isBodyWithReactModalOpenClass()).toBeTruthy();
   });
-  
+
   it('should not add classes to document.body for unopened modals', () => {
     renderModal({ isOpen: true });
     expect(isBodyWithReactModalOpenClass()).toBeTruthy();
@@ -259,6 +259,14 @@ describe('State', () => {
     expect(isBodyWithReactModalOpenClass()).toBeTruthy();
   });
 
+  it('additional aria attributes', () => {
+    const modal = renderModal({ isOpen: true, aria: { labelledby: "a" }}, 'hello');
+    expect(
+      mcontent(modal).getAttribute('aria-labelledby')
+    ).toEqual("a");
+    unmountModal();
+  });
+
   it('adding/removing aria-hidden without an appElement will try to fallback to document.body', () => {
     ariaAppHider.documentNotReadyOrSSRTesting();
     const node = document.createElement('div');

src/components/Modal.js

@@ -53,6 +53,7 @@ export default class Modal extends Component {
     ariaHideApp: PropTypes.bool,
     shouldCloseOnOverlayClick: PropTypes.bool,
     parentSelector: PropTypes.func,
+    aria: PropTypes.object,
     role: PropTypes.string,
     contentLabel: PropTypes.string.isRequired
   };

src/components/ModalPortal.js

@@ -51,6 +51,7 @@ export default class ModalPortal extends Component {
     shouldCloseOnOverlayClick: PropTypes.bool,
     role: PropTypes.string,
     contentLabel: PropTypes.string,
+    aria: PropTypes.object,
     children: PropTypes.node
   };
 
@@ -254,6 +255,11 @@ export default class ModalPortal extends Component {
       `${className} ${additional}` : className;
   }
 
+  ariaAttributes = items => Object.keys(items).reduce((acc, name) => {
+    acc[`aria-${name}`] = items[name];
+    return acc;
+  }, {});
+
   render() {
     const { className, overlayClassName, defaultStyles } = this.props;
     const contentStyles = className ? {} : defaultStyles.content;
@@ -273,7 +279,8 @@ export default class ModalPortal extends Component {
           onKeyDown={this.handleKeyDown}
           onClick={this.handleContentOnClick}
           role={this.props.role}
-          aria-label={this.props.contentLabel}>
+          aria-label={this.props.contentLabel}
+          {...this.ariaAttributes(this.props.aria || {})}>
           {this.props.children}
         </div>
       </div>