diff --git a/models/issue_comment.go b/models/issue_comment.go
index 9b5b3ed45b7a..79311c5aa1a0 100644
--- a/models/issue_comment.go
+++ b/models/issue_comment.go
@@ -345,11 +345,7 @@ func (c *Comment) getPathAndFile(repoPath string) (string, string) {
 func (c *Comment) checkInvalidation(e Engine, repo *git.Repository, branch string) error {
 	p, file := c.getPathAndFile(repo.Path)
 	// FIXME differentiate between previous and proposed line
-	var line = c.Line
-	if line < 0 {
-		line *= -1
-	}
-	commit, err := repo.LineBlame(branch, p, file, uint(line))
+	commit, err := repo.LineBlame(branch, p, file, uint(c.UnsignedLine()))
 	if err != nil {
 		return err
 	}
@@ -366,6 +362,22 @@ func (c *Comment) CheckInvalidation(repo *git.Repository, branch string) error {
 	return c.checkInvalidation(x, repo, branch)
 }
 
+// DiffSide returns "previous" if Comment.Line is a LOC of the previous changes and "proposed" if it is a LOC of the proposed changes.
+func (c *Comment) DiffSide() string {
+	if c.Line < 0 {
+		return "previous"
+	}
+	return "proposed"
+}
+
+// UnsignedLine returns the LOC of the code comment without + or -
+func (c *Comment) UnsignedLine() uint64 {
+	if c.Line < 0 {
+		return uint64(c.Line * -1)
+	}
+	return uint64(c.Line)
+}
+
 func createComment(e *xorm.Session, opts *CreateCommentOptions) (_ *Comment, err error) {
 	var LabelID int64
 	if opts.Label != nil {
diff --git a/public/js/index.js b/public/js/index.js
index 78fc202a9b33..42342c2147af 100644
--- a/public/js/index.js
+++ b/public/js/index.js
@@ -789,6 +789,7 @@ function initPullRequestReview() {
         var isSplit = $(this).closest('.code-diff').hasClass('code-diff-split');
         var side = $(this).data('side');
         var idx = $(this).data('idx');
+        var path = $(this).data('path');
         var form = $('#pull_review_add_comment').html();
         var tr = $(this).closest('tr');
         var ntr = tr.next();
@@ -815,12 +816,12 @@ function initPullRequestReview() {
             commentCloud.find('.tab.segment').each(function(i, item) {
                 $(item).attr('data-tab', $(item).attr('data-tab') + id);
             });
+            td.find("input[name='line']").val(idx);
+            td.find("input[name='side']").val(side === "left" ? "previous":"proposed");
+            td.find("input[name='path']").val(path);
             initCommentPreviewTab(commentCloud.find('.form'));
         }
         commentCloud.find('textarea').focus();
-
-
-        //alert($(this).data('side') + $(this).data('idx'));
     });
 }
 
@@ -2265,7 +2266,7 @@ function initTopicbar() {
                     return
                 }
                 var topicArray = topics.split(",");
-                
+
                 var last = viewDiv.children("a").last();
                 for (var i=0;i < topicArray.length; i++) {
                     $('<div class="ui green basic label topic" style="cursor:pointer;">'+topicArray[i]+'</div>').insertBefore(last)
diff --git a/templates/repo/diff/box.tmpl b/templates/repo/diff/box.tmpl
index 113980e96091..2e006b121b64 100644
--- a/templates/repo/diff/box.tmpl
+++ b/templates/repo/diff/box.tmpl
@@ -102,7 +102,7 @@
 														<td class="lines-num lines-num-old">
 															<span rel="{{if $line.LeftIdx}}diff-{{Sha1 $file.Name}}L{{$line.LeftIdx}}{{end}}">{{if $line.LeftIdx}}{{$line.LeftIdx}}{{end}}</span>
 															{{if $line.LeftIdx}}
-															<a class="ui green button add-code-comment add-code-comment-left" data-side="left" data-idx="{{$line.LeftIdx}}">+</a>
+															<a class="ui green button add-code-comment add-code-comment-left" data-path="{{$file.Name}}" data-side="left" data-idx="{{$line.LeftIdx}}">+</a>
 															{{end}}
 														</td>
 														<td class="lines-code lines-code-old halfwidth">
@@ -111,7 +111,7 @@
 														<td class="lines-num lines-num-new">
 															<span rel="{{if $line.RightIdx}}diff-{{Sha1 $file.Name}}R{{$line.RightIdx}}{{end}}">{{if $line.RightIdx}}{{$line.RightIdx}}{{end}}</span>
 															{{if $line.RightIdx}}
-															<a class="ui green button add-code-comment add-code-comment-right" data-side="right" data-idx="{{$line.RightIdx}}">+</a>
+															<a class="ui green button add-code-comment add-code-comment-right" data-path="{{$file.Name}}" data-side="right" data-idx="{{$line.RightIdx}}">+</a>
 															{{end}}
 														</td>
 
@@ -128,7 +128,7 @@
 																		{{ template "repo/diff/comments" dict "root" $ "comments" $line.Comments}}
 																		</ui>
 																	</div>
-																{{template "repo/diff/comment_form" $}}
+																{{template "repo/diff/comment_form_datahandler" dict "root" $ "comment" (index $line.Comments 0)}}
 																</div>
 															</td>
 														</tr>
@@ -158,7 +158,7 @@
 	{{end}}
 
 	<div id="pull_review_add_comment" class="hide">
-		{{template "repo/diff/new_comment" .}}
+		{{template "repo/diff/new_comment" dict "root" .}}
 	</div>
 
 	{{if .IsSplitStyle}}
diff --git a/templates/repo/diff/comment_form.tmpl b/templates/repo/diff/comment_form.tmpl
index a27494ab425e..4e6d44220aec 100644
--- a/templates/repo/diff/comment_form.tmpl
+++ b/templates/repo/diff/comment_form.tmpl
@@ -1,37 +1,36 @@
-<form class="ui form" action="{{.Link}}/reviews/comments" method="post">
-{{.CsrfTokenHtml}}
-	<input type="hidden" name="side" value="previous">
-	<input type="hidden" name="line" value="2">
-	<input type="hidden" name="path" value="README.md">
-	<input type="hidden" name="commit_id" value="e324f1688f063d6fd9268fb8f02149c9eb1a867c">
+<form class="ui form" action="{{$.root.Link}}/reviews/comments" method="post">
+{{$.root.CsrfTokenHtml}}
+	<input type="hidden" name="side" value="{{if $.Side}}{{$.Side}}{{end}}">
+	<input type="hidden" name="line" value="{{if $.Line}}{{$.Line}}{{end}}">
+	<input type="hidden" name="path" value="{{if $.File}}{{$.File}}{{end}}">
 	<input type="hidden" name="diff_start_cid">
 	<input type="hidden" name="diff_end_cid">
 	<input type="hidden" name="diff_base_cid">
 	<div class="ui top attached tabular menu" data-write="write" data-preview="preview">
-		<a class="active item" data-tab="write">{{.i18n.Tr "write"}}</a>
-		<a class="item" data-tab="preview" data-url="{{AppSubUrl}}/api/v1/markdown" data-context="{{.RepoLink}}">{{.i18n.Tr "preview"}}</a>
+		<a class="active item" data-tab="write">{{$.root.i18n.Tr "write"}}</a>
+		<a class="item" data-tab="preview" data-url="{{$.root.AppSubUrl}}/api/v1/markdown" data-context="{{$.root.RepoLink}}">{{$.root.i18n.Tr "preview"}}</a>
 	</div>
 	<div class="ui bottom attached active tab segment" data-tab="write">
 		<div class="field">
-			<textarea name="content" placeholder="{{$.i18n.Tr "repo.diff.comment.placeholder"}}"></textarea>
+			<textarea name="content" placeholder="{{$.root.i18n.Tr "repo.diff.comment.placeholder"}}"></textarea>
 		</div>
 	</div>
 	<div class="ui bottom attached tab segment markdown" data-tab="preview">
 	{{.i18n.Tr "loading"}}
 	</div>
 	<div class="footer">
-		<span class="markdown-info"><i class="octicon octicon-markdown"></i> {{$.i18n.Tr "repo.diff.comment.markdown_info"}}</span>
+		<span class="markdown-info"><i class="octicon octicon-markdown"></i> {{$.root.i18n.Tr "repo.diff.comment.markdown_info"}}</span>
 		<div class="ui right floated">
-			{{if $.CurrentReview}}
+			{{if $.root.CurrentReview}}
 				<button name="is_review" value="true" type="submit"
-						class="ui submit green tiny button btn-add-comment">{{$.i18n.Tr "repo.diff.comment.add_review_comment"}}</button>
+						class="ui submit green tiny button btn-add-comment">{{$.root.i18n.Tr "repo.diff.comment.add_review_comment"}}</button>
 			{{else}}
 				<button name="is_review" value="true"  type="submit"
-						class="ui submit green tiny button btn-start-review">{{$.i18n.Tr "repo.diff.comment.start_review"}}</button>
+						class="ui submit green tiny button btn-start-review">{{$.root.i18n.Tr "repo.diff.comment.start_review"}}</button>
 			{{end}}
 			<button type="submit"
-					class="ui submit tiny basic button btn-add-single">{{$.i18n.Tr "repo.diff.comment.add_single_comment"}}</button>
-			<button type="button" class="ui submit tiny basic button btn-cancel">{{$.i18n.Tr "cancel"}}</button>
+					class="ui submit tiny basic button btn-add-single">{{$.root.i18n.Tr "repo.diff.comment.add_single_comment"}}</button>
+			<button type="button" class="ui submit tiny basic button btn-cancel">{{$.root.i18n.Tr "cancel"}}</button>
 		</div>
 	</div>
 </form>
diff --git a/templates/repo/diff/comment_form_datahandler.tmpl b/templates/repo/diff/comment_form_datahandler.tmpl
new file mode 100644
index 000000000000..be18dfdb6d33
--- /dev/null
+++ b/templates/repo/diff/comment_form_datahandler.tmpl
@@ -0,0 +1,7 @@
+{{if $.comment}}
+	{{ template "repo/diff/comment_form" dict "root" $.root "Line" $.comment.UnsignedLine "File" $.comment.TreePath "Side" $.comment.DiffSide}}
+{{else if $.root}}
+	{{ template "repo/diff/comment_form" $}}
+{{else}}
+	{{ template "repo/diff/comment_form" dict "root" $}}
+{{end}}
diff --git a/templates/repo/diff/new_comment.tmpl b/templates/repo/diff/new_comment.tmpl
index 12779c0e6f3b..d8b6ccb9dd1a 100644
--- a/templates/repo/diff/new_comment.tmpl
+++ b/templates/repo/diff/new_comment.tmpl
@@ -1,3 +1,3 @@
 <div class="field comment-code-cloud">
-	{{ template "repo/diff/comment_form" .}}
+	{{template "repo/diff/comment_form_datahandler" .}}
 </div>
diff --git a/templates/repo/diff/section_unified.tmpl b/templates/repo/diff/section_unified.tmpl
index 74174f1a1123..9e163b6d40de 100644
--- a/templates/repo/diff/section_unified.tmpl
+++ b/templates/repo/diff/section_unified.tmpl
@@ -13,7 +13,7 @@
 			</td>
 			<td class="lines-num lines-num-new">
 				<span rel="{{if $line.RightIdx}}diff-{{Sha1 $file.Name}}R{{$line.RightIdx}}{{end}}">{{if $line.RightIdx}}{{$line.RightIdx}}{{end}}</span>
-				<a class="ui green button add-code-comment add-code-comment-{{if $line.RightIdx}}right{{else}}left{{end}}" data-side="{{if $line.RightIdx}}right{{else}}left{{end}}" data-idx="{{if $line.RightIdx}}{{$line.RightIdx}}{{else}}{{$line.LeftIdx}}{{end}}">+</a>
+				<a class="ui green button add-code-comment add-code-comment-{{if $line.RightIdx}}right{{else}}left{{end}}" data-path="{{$file.Name}}" data-side="{{if $line.RightIdx}}right{{else}}left{{end}}" data-idx="{{if $line.RightIdx}}{{$line.RightIdx}}{{else}}{{$line.LeftIdx}}{{end}}">+</a>
 			</td>
 			{{end}}
 			<td class="lines-code {{if (not $line.RightIdx)}}lines-code-old{{end}}">
@@ -29,7 +29,7 @@
 						{{ template "repo/diff/comments" dict "root" $.root "comments" $line.Comments}}
 						</ui>
 					</div>
-				{{template "repo/diff/comment_form" $.root }}
+				{{template "repo/diff/comment_form_datahandler" dict "root" $.root "comment" (index $line.Comments 0)}}
 				</div>
 			</td>
 		</tr>