Scroll to diff file when clicking on file name57669-fix-bug-clicking-file-header-refreshes-page

- Add an ID to the diff content
- handle clicking on file name in diffFileHeader when it is not a link
to another page but rather a link to an element on the page

2 files changed, 45 insertions, 15 deletions

diff --git a/app/assets/javascripts/diffs/components/diff_file.vue b/app/assets/javascripts/diffs/components/diff_file.vue
index 0e779e1be9a..58a9605c181 100644
--- a/app/assets/javascripts/diffs/components/diff_file.vue
+++ b/app/assets/javascripts/diffs/components/diff_file.vue
@@ -170,21 +170,23 @@ export default {
     </div>
     <gl-loading-icon v-if="showLoadingIcon" class="diff-content loading" />
     <template v-else>
-      <div v-if="errorMessage" class="diff-viewer">
-        <div class="nothing-here-block" v-html="errorMessage"></div>
+      <div :id="`diff-content-${file.file_hash}`">
+        <div v-if="errorMessage" class="diff-viewer">
+          <div class="nothing-here-block" v-html="errorMessage"></div>
+        </div>
+        <div v-else-if="isCollapsed" class="nothing-here-block diff-collapsed">
+          {{ __('This diff is collapsed.') }}
+          <a class="click-to-expand js-click-to-expand" href="#" @click.prevent="handleToggle">{{
+            __('Click to expand it.')
+          }}</a>
+        </div>
+        <diff-content
+          v-else
+          :class="{ hidden: isCollapsed || isFileTooLarge }"
+          :diff-file="file"
+          :help-page-path="helpPagePath"
+        />
       </div>
-      <div v-else-if="isCollapsed" class="nothing-here-block diff-collapsed">
-        {{ __('This diff is collapsed.') }}
-        <a class="click-to-expand js-click-to-expand" href="#" @click.prevent="handleToggle">{{
-          __('Click to expand it.')
-        }}</a>
-      </div>
-      <diff-content
-        v-else
-        :class="{ hidden: isCollapsed || isFileTooLarge }"
-        :diff-file="file"
-        :help-page-path="helpPagePath"
-      />
     </template>
     <div v-if="isFileTooLarge" class="nothing-here-block diff-collapsed js-too-large-diff">
       {{ __('This source diff could not be displayed because it is too large.') }}
diff --git a/app/assets/javascripts/diffs/components/diff_file_header.vue b/app/assets/javascripts/diffs/components/diff_file_header.vue
index a5125c3d077..1f08875be3b 100644
--- a/app/assets/javascripts/diffs/components/diff_file_header.vue
+++ b/app/assets/javascripts/diffs/components/diff_file_header.vue
@@ -11,6 +11,7 @@ import { __, s__, sprintf } from '~/locale';
 import { diffViewerModes } from '~/ide/constants';
 import EditButton from './edit_button.vue';
 import DiffStats from './diff_stats.vue';
+import { scrollToElement } from '~/lib/utils/common_utils';
 
 export default {
   components: {
@@ -66,6 +67,9 @@ export default {
     hasExpandedDiscussions() {
       return this.diffHasExpandedDiscussions(this.diffFile);
     },
+    diffContentIDSelector() {
+      return `#diff-content-${this.diffFile.file_hash}`;
+    },
     icon() {
       if (this.diffFile.submodule) {
         return 'archive';
@@ -77,6 +81,11 @@ export default {
       if (this.diffFile.submodule) {
         return this.diffFile.submodule_tree_url || this.diffFile.submodule_link;
       }
+
+      if (!this.discussionPath) {
+        return this.diffContentIDSelector;
+      }
+
       return this.discussionPath;
     },
     filePath() {
@@ -152,6 +161,18 @@ export default {
     handleToggleDiscussions() {
       this.toggleFileDiscussions(this.diffFile);
     },
+    handleFileNameClick(e) {
+      const isLinkToOtherPage =
+        this.diffFile.submodule_tree_url || this.diffFile.submodule_link || this.discussionPath;
+
+      if (!isLinkToOtherPage) {
+        e.preventDefault();
+        const selector = this.diffContentIDSelector;
+
+        scrollToElement(document.querySelector(selector));
+        window.location.hash = selector;
+      }
+    },
   },
 };
 </script>
@@ -171,7 +192,14 @@ export default {
         class="diff-toggle-caret append-right-5"
         @click.stop="handleToggle"
       />
-      <a v-once ref="titleWrapper" :href="titleLink" class="append-right-4 js-title-wrapper">
+      <a
+        v-once
+        id="diffFile.file_path"
+        ref="titleWrapper"
+        class="append-right-4 js-title-wrapper"
+        :href="titleLink"
+        @click="handleFileNameClick"
+      >
         <file-icon
           :file-name="filePath"
           :size="18"