1 files changed, 23 insertions, 0 deletions
diff --git a/scraper/client/paper/paper.verify.js b/scraper/client/paper/paper.verify.js
index 8cb14d84..98692588 100644
--- a/scraper/client/paper/paper.verify.js
+++ b/scraper/client/paper/paper.verify.js
@@ -99,6 +99,24 @@ class PaperVerify extends Component {
     this.next(false)
   }
 
+  prev() {
+    const { key } = this.props.api.paperInfo.dataset
+    const { paperInfo } = this.props.api
+    let citationIndex = (paperInfo.citations || [])
+      .findIndex(f => f.id === this.state.citation.id)
+    if (citationIndex === -1) {
+      history.push('/paper/' + key + '/info/')
+    } else {
+      citationIndex -= 1
+      if (citationIndex < 0) {
+        history.push('/paper/' + key + '/info/')
+      } else {
+        let nextId = paperInfo.citations[citationIndex].id
+        history.push('/paper/' + key + '/verify/' + nextId)
+      }
+    }
+  }
+
   next() {
     const { key } = this.props.api.paperInfo.dataset
     const { paperInfo } = this.props.api
@@ -228,6 +246,11 @@ class PaperVerify extends Component {
 
           <button
             className='btn'
+            onClick={this.prev.bind(this)}
+          >{'Prev >'}</button>
+
+          <button
+            className='btn'
             onClick={this.next.bind(this)}
           >{'Next >'}</button>
         </div>