Added title prop to dcc.Link (#768)

* Added title prop

* Added changelog entry

* Adding basic test

CHANGELOG.md

@@ -5,6 +5,7 @@ This project adheres to [Semantic Versioning](http://semver.org/).
 ## [Unreleased]
 ### Changed
 - [#766](https://github.com/plotly/dash-core-components/pull/766) Update from React 16.8.6 to 16.13.0
+- [#768](https://github.com/plotly/dash-core-components/pull/768) Added title property to dcc.Link
 
 
 ## [1.8.1] -2020-02-27

src/components/Link.react.js

@@ -54,7 +54,7 @@ export default class Link extends Component {
     }
 
     render() {
-        const {className, style, id, href, loading_state} = this.props;
+        const {className, style, id, href, title, loading_state} = this.props;
         /*
          * ideally, we would use cloneElement however
          * that doesn't work with dash's recursive
@@ -70,6 +70,7 @@ export default class Link extends Component {
                 style={style}
                 href={href}
                 onClick={e => this.updateLocation(e)}
+                title={title}
             >
                 {this.props.children}
             </a>
@@ -100,6 +101,11 @@ Link.propTypes = {
      * Defines CSS styles which will override styles previously set.
      */
     style: PropTypes.object,
+    /**
+     * Adds the title attribute to your link, which can contain supplementary
+     * information.
+     */
+    title: PropTypes.string,
     /**
      * The children of this component
      */

tests/integration/link/test_title_prop.py

@@ -0,0 +1,26 @@
+import pytest
+import dash
+from dash.dependencies import Input, Output
+import dash_core_components as dcc
+import dash_html_components as html
+
+
+@pytest.mark.DCC768
+def test_liti001_prop(dash_dcc):
+    app = dash.Dash(__name__)
+    app.layout = html.Div(
+        [
+            dcc.Link("page 1", id="link1", href="/page-1", title="This is a test title!"),
+            dcc.Location(id="url", refresh=False),
+            html.Div(id="content")
+        ]
+    )
+    @app.callback(Output("content", "children"), [Input("link1", "title")])
+    def display_title(title):
+        return title
+
+    dash_dcc.start_server(app)
+
+    title_exists = dash_dcc.find_element('#link1').get_attribute('title')
+
+    assert title_exists == "This is a test title!"