1 files changed, 40 insertions, 0 deletions
diff --git a/devtools/client/netmonitor/src/components/messages/ColumnLastEventId.js b/devtools/client/netmonitor/src/components/messages/ColumnLastEventId.js
new file mode 100644
index 0000000000..2c5a65313a
--- /dev/null
+++ b/devtools/client/netmonitor/src/components/messages/ColumnLastEventId.js
@@ -0,0 +1,40 @@
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+"use strict";
+
+const {
+  Component,
+} = require("resource://devtools/client/shared/vendor/react.js");
+const dom = require("resource://devtools/client/shared/vendor/react-dom-factories.js");
+const PropTypes = require("resource://devtools/client/shared/vendor/react-prop-types.js");
+
+/**
+ * Renders the "LastEventId" column of a message.
+ */
+class ColumnLastEventId extends Component {
+  static get propTypes() {
+    return {
+      item: PropTypes.object.isRequired,
+    };
+  }
+
+  shouldComponentUpdate(nextProps) {
+    return this.props.item.lastEventId !== nextProps.item.lastEventId;
+  }
+
+  render() {
+    const { lastEventId } = this.props.item;
+
+    return dom.td(
+      {
+        className: "message-list-column message-list-lastEventId",
+        title: lastEventId,
+      },
+      lastEventId
+    );
+  }
+}
+
+module.exports = ColumnLastEventId;