Refactor branch/tag selector dropdown (first step) (#23394)

Follow: 
* #23345

The branch/tag selector dropdown mixes jQuery/Fomantic UI/Vue together,
it's very diffcult to maintain and causes unfixable a11y problems. It
also causes problems like #19851 #21314 #21952

This PR is the first step for the refactoring, move `data-` attributes
to JS object and use Vue data as much as possible.

The old selector `'.choose.reference .dropdown'` was also wrong, it hits
`<div class="choose reference"><svg class="dropdown icon">` and would
cause undefined behaviors.

I have done some quick tests and it works. After this PR gets merged, I
will move the code into a Vue SFC in next PR.



![image](https://user-images.githubusercontent.com/2114189/224099638-378a8a86-0865-47d1-bcba-f972506374c7.png)


![image](https://user-images.githubusercontent.com/2114189/224099690-70276cf5-b1e4-404a-b0c6-582448abf40e.png)

---------

Co-authored-by: techknowlogick <techknowlogick@gitea.io>

4 files changed, 101 insertions, 104 deletions

diff --git a/templates/repo/branch_dropdown.tmpl b/templates/repo/branch_dropdown.tmpl
index 89d65146a9..8e81373aec 100644
--- a/templates/repo/branch_dropdown.tmpl
+++ b/templates/repo/branch_dropdown.tmpl
@@ -2,101 +2,111 @@
 {{$defaultBranch := $.root.BranchName}}{{if and .root.IsViewTag (not .noTag)}}{{$defaultBranch = .root.TagName}}{{end}}{{if eq $defaultBranch ""}}{{$defaultBranch = $.root.Repository.DefaultBranch}}{{end}}
 {{$type := ""}}{{if and .root.IsViewTag (not .noTag)}}{{$type = "tag"}}{{else if .root.IsViewBranch}}{{$type = "branch"}}{{else}}{{$type = "tree"}}{{end}}
 {{$showBranchesInDropdown := not .root.HideBranchesInDropdown}}
+
+<script type="module">
+	const data = {
+		'textReleaseCompare': {{.root.locale.Tr "repo.release.compare"}},
+		'textCreateTag': {{.root.locale.Tr "repo.tag.create_tag"}},
+		'textCreateBranch': {{.root.locale.Tr "repo.branch.create_branch"}},
+		'textCreateBranchFrom': {{.root.locale.Tr "repo.branch.create_from"}},
+		'textBranches': {{.root.locale.Tr "repo.branches"}},
+		'textTags': {{.root.locale.Tr "repo.tags"}},
+
+		'mode': '{{if or .root.IsViewTag .isTag}}tags{{else}}branches{{end}}',
+		'showBranchesInDropdown': {{$showBranchesInDropdown}},
+		'searchFieldPlaceholder': '{{if $.noTag}}{{.root.locale.Tr "repo.pulls.filter_branch"}}{{else if $showBranchesInDropdown}}{{.root.locale.Tr "repo.filter_branch_and_tag"}}{{else}}{{.root.locale.Tr "repo.find_tag"}}{{end}}...',
+		'branchForm': {{$.branchForm}},
+		'disableCreateBranch': {{if .disableCreateBranch}}{{.disableCreateBranch}}{{else}}{{not .root.CanCreateBranch}}{{end}},
+		'setAction': {{.setAction}},
+		'submitForm': {{.submitForm}},
+		'viewType': {{$type}},
+		'refName': {{if and .root.IsViewTag (not .noTag)}}{{.root.TagName}}{{else if .root.IsViewBranch}}{{.root.BranchName}}{{else}}{{ShortSha .root.CommitID}}{{end}},
+		'commitIdShort': {{ShortSha .root.CommitID}},
+		'tagName': {{.root.TagName}},
+		'branchName': {{.root.BranchName}},
+		'noTag': {{.noTag}},
+		'branches': {{.root.Branches}},
+		'tags': {{.root.Tags}},
+		'defaultBranch': {{$defaultBranch}},
+		'branchURLPrefix': '{{if .branchURLPrefix}}{{.branchURLPrefix}}{{else}}{{$.root.RepoLink}}/{{if $.root.PageIsCommits}}commits{{else}}src{{end}}/branch/{{end}}',
+		'branchURLSuffix': '{{if .branchURLSuffix}}{{.branchURLSuffix}}{{else}}{{if $.root.TreePath}}/{{PathEscapeSegments $.root.TreePath}}{{end}}{{end}}',
+		'tagURLPrefix': '{{if .tagURLPrefix}}{{.tagURLPrefix}}{{else if $release}}{{$.root.RepoLink}}/compare/{{else}}{{$.root.RepoLink}}/{{if $.root.PageIsCommits}}commits{{else}}src{{end}}/tag/{{end}}',
+		'tagURLSuffix': '{{if .tagURLSuffix}}{{.tagURLSuffix}}{{else if $release}}...{{if $release.IsDraft}}{{PathEscapeSegments $release.Target}}{{else}}{{if $release.TagName}}{{PathEscapeSegments $release.TagName}}{{else}}{{PathEscapeSegments $release.Sha1}}{{end}}{{end}}{{else}}{{if $.root.TreePath}}/{{PathEscapeSegments $.root.TreePath}}{{end}}{{end}}',
+		'repoLink': {{.root.RepoLink}},
+		'treePath': {{.root.TreePath}},
+		'branchNameSubURL': {{.root.BranchNameSubURL}},
+		'noResults': {{.root.locale.Tr "repo.pulls.no_results"}},
+	};
+	{{if .release}}
+	data.release = {
+		'tagName': {{.release.TagName}},
+	};
+	{{end}}
+	window.config.pageData.branchDropdownDataList = window.config.pageData.branchDropdownDataList || [];
+	window.config.pageData.branchDropdownDataList.push(data);
+</script>
+
 <div class="fitted item choose reference">
-	<div class="ui floating filter dropdown custom"
-		data-branch-form="{{if $.branchForm}}{{$.branchForm}}{{end}}"
-		data-can-create-branch="{{if .canCreateBranch}}{{.canCreateBranch}}{{else}}{{.root.CanCreateBranch}}{{end}}"
-		data-no-results="{{.root.locale.Tr "repo.pulls.no_results"}}"
-		data-set-action="{{.setAction}}" data-submit-form="{{.submitForm}}"
-		data-view-type="{{$type}}"
-		data-ref-name="{{if and .root.IsViewTag (not .noTag)}}{{.root.TagName}}{{else if .root.IsViewBranch}}{{.root.BranchName}}{{else}}{{ShortSha .root.CommitID}}{{end}}"
-		data-branch-url-prefix="{{if .branchURLPrefix}}{{.branchURLPrefix}}{{else}}{{$.root.RepoLink}}/{{if $.root.PageIsCommits}}commits{{else}}src{{end}}/branch/{{end}}"
-		data-branch-url-suffix="{{if .branchURLSuffix}}{{.branchURLSuffix}}{{else}}{{if $.root.TreePath}}/{{PathEscapeSegments $.root.TreePath}}{{end}}{{end}}"
-		data-tag-url-prefix="{{if .tagURLPrefix}}{{.tagURLPrefix}}{{else if $release}}{{$.root.RepoLink}}/compare/{{else}}{{$.root.RepoLink}}/{{if $.root.PageIsCommits}}commits{{else}}src{{end}}/tag/{{end}}"
-		data-tag-url-suffix="{{if .tagURLSuffix}}{{.tagURLSuffix}}{{else if $release}}...{{if $release.IsDraft}}{{PathEscapeSegments $release.Target}}{{else}}{{if $release.TagName}}{{PathEscapeSegments $release.TagName}}{{else}}{{PathEscapeSegments $release.Sha1}}{{end}}{{end}}{{else}}{{if $.root.TreePath}}/{{PathEscapeSegments $.root.TreePath}}{{end}}{{end}}">
+	<div class="ui floating filter dropdown custom">
 		<button class="branch-dropdown-button gt-ellipsis ui basic small compact button gt-df" @click="menuVisible = !menuVisible" @keyup.enter="menuVisible = !menuVisible">
 			<span class="text gt-df gt-ac gt-mr-2">
-				{{if $release}}
-					{{.root.locale.Tr "repo.release.compare"}}
-				{{else}}
-					<span :class="{visible: isViewTag}" v-if="isViewTag" {{if not (eq $type "tag")}}v-cloak{{end}}>{{svg "octicon-tag"}}</span>
-					<span :class="{visible: isViewBranch}" v-if="isViewBranch" {{if not (eq $type "branch")}}v-cloak{{end}}>{{svg "octicon-git-branch"}}</span>
-					<span :class="{visible: isViewTree}" v-if="isViewTree" {{if not (eq $type "tree")}}v-cloak{{end}}>{{svg "octicon-git-branch"}}</span>
-					<strong ref="dropdownRefName" class="gt-ml-3">{{if and .root.IsViewTag (not .noTag)}}{{.root.TagName}}{{else if .root.IsViewBranch}}{{.root.BranchName}}{{else}}{{ShortSha .root.CommitID}}{{end}}</strong>
-				{{end}}
+				{{/* v-cloak is used to hide unnecessary elements before Vue componment is mounted */}}
+				<span v-cloak v-if="release">${ textReleaseCompare }</span>
+				<span :class="{visible: isViewTag}" v-if="isViewTag" {{if not (eq $type "tag")}}v-cloak{{end}}>{{svg "octicon-tag"}}</span>
+				<span :class="{visible: isViewBranch}" v-if="isViewBranch" {{if not (eq $type "branch")}}v-cloak{{end}}>{{svg "octicon-git-branch"}}</span>
+				<span :class="{visible: isViewTree}" v-if="isViewTree" {{if not (eq $type "tree")}}v-cloak{{end}}>{{svg "octicon-git-branch"}}</span>
+				<strong ref="dropdownRefName" class="gt-ml-3">{{if and .root.IsViewTag (not .noTag)}}{{.root.TagName}}{{else if .root.IsViewBranch}}{{.root.BranchName}}{{else}}{{ShortSha .root.CommitID}}{{end}}</strong>
 			</span>
 			{{svg "octicon-triangle-down" 14 "dropdown icon"}}
 		</button>
-		<div class="data gt-hidden" data-mode="{{if or .root.IsViewTag .isTag}}tags{{else}}branches{{end}}">
-			{{if $showBranchesInDropdown}}
-				{{range .root.Branches}}
-					<div class="item branch {{if eq $defaultBranch .}}selected{{end}}" data-url="{{PathEscapeSegments .}}">{{.}}</div>
-				{{end}}
-			{{end}}
-			{{if (not .noTag)}}
-				{{range .root.Tags}}
-					{{if $release}}
-						<div class="item tag {{if eq $release.TagName .}}selected{{end}}" data-url="{{PathEscapeSegments .}}">{{.}}</div>
-					{{else}}
-						<div class="item tag {{if eq $defaultBranch .}}selected{{end}}" data-url="{{PathEscapeSegments .}}">{{.}}</div>
-					{{end}}
-				{{end}}
-			{{end}}
-		</div>
 		<div class="menu transition" :class="{visible: menuVisible}" v-if="menuVisible" v-cloak>
 			<div class="ui icon search input">
 				<i class="icon gt-df gt-ac gt-jc gt-m-0">{{svg "octicon-filter" 16}}</i>
-				<input name="search" ref="searchField" autocomplete="off" v-model="searchTerm" @keydown="keydown($event)" placeholder="{{if $.noTag}}{{.root.locale.Tr "repo.pulls.filter_branch"}}{{else if $showBranchesInDropdown}}{{.root.locale.Tr "repo.filter_branch_and_tag"}}{{else}}{{.root.locale.Tr "repo.find_tag"}}{{end}}...">
+				<input name="search" ref="searchField" autocomplete="off" v-model="searchTerm" @keydown="keydown($event)" :placeholder="searchFieldPlaceholder">
 			</div>
-			{{if $showBranchesInDropdown}}
+			<template v-if="showBranchesInDropdown">
 				<div class="header branch-tag-choice">
 					<div class="ui grid">
 						<div class="two column row">
 							<a class="reference column" href="#" @click="createTag = false; mode = 'branches'; focusSearchField()">
-								<span class="text" :class="{black: mode == 'branches'}">
-									{{svg "octicon-git-branch" 16 "gt-mr-2"}}{{.root.locale.Tr "repo.branches"}}
+								<span class="text" :class="{black: mode === 'branches'}">
+									{{svg "octicon-git-branch" 16 "gt-mr-2"}}${ textBranches }
 								</span>
 							</a>
-							{{if not .noTag}}
+							<template v-if="!noTag">
 								<a class="reference column" href="#" @click="createTag = true; mode = 'tags'; focusSearchField()">
-									<span class="text" :class="{black: mode == 'tags'}">
-										{{svg "octicon-tag" 16 "gt-mr-2"}}{{.root.locale.Tr "repo.tags"}}
+									<span class="text" :class="{black: mode === 'tags'}">
+										{{svg "octicon-tag" 16 "gt-mr-2"}}${ textTags }
 									</span>
 								</a>
-							{{end}}
+							</template>
 						</div>
 					</div>
 				</div>
-			{{end}}
+			</template>
 			<div class="scrolling menu" ref="scrollContainer">
-				<div v-for="(item, index) in filteredItems" :key="item.name" class="item" :class="{selected: item.selected, active: active == index}" @click="selectItem(item)" :ref="'listItem' + index">${ item.name }</div>
-				<div class="item" v-if="showCreateNewBranch" :class="{active: active == filteredItems.length}" :ref="'listItem' + filteredItems.length">
+				<div v-for="(item, index) in filteredItems" :key="item.name" class="item" :class="{selected: item.selected, active: active === index}" @click="selectItem(item)" :ref="'listItem' + index">${ item.name }</div>
+				<div class="item" v-if="showCreateNewBranch" :class="{active: active === filteredItems.length}" :ref="'listItem' + filteredItems.length">
 					<a href="#" @click="createNewBranch()">
 						<div v-show="createTag">
 							<i class="reference tags icon"></i>
-							{{.root.locale.Tr "repo.tag.create_tag" `${ searchTerm }` | Safe}}
+							<span v-html="textCreateTag.replace('%s', searchTerm)"></span>
 						</div>
 						<div v-show="!createTag">
 							{{svg "octicon-git-branch"}}
-							{{.root.locale.Tr "repo.branch.create_branch" `${ searchTerm }` | Safe}}
+							<span v-html="textCreateBranch.replace('%s', searchTerm)"></span>
 						</div>
 						<div class="text small">
-							{{if or .root.IsViewBranch $release}}
-								{{.root.locale.Tr "repo.branch.create_from" .root.BranchName}}
-							{{else if .root.IsViewTag}}
-								{{.root.locale.Tr "repo.branch.create_from" .root.TagName}}
-							{{else}}
-								{{.root.locale.Tr "repo.branch.create_from" (ShortSha .root.CommitID)}}
-							{{end}}
+							<span v-if="isViewBranch || release">${ textCreateBranchFrom.replace('%s', branchName) }</span>
+							<span v-else-if="isViewTag">${ textCreateBranchFrom.replace('%s', tagName) }</span>
+							<span v-else>${ textCreateBranchFrom.replace('%s', commitIdShort) }</span>
 						</div>
 					</a>
 					<form ref="newBranchForm" action="{{.root.RepoLink}}/branches/_new/{{.root.BranchNameSubURL}}" method="post">
-						{{.root.CsrfTokenHtml}}
+						<input type="hidden" name="_csrf" :value="csrfToken">
 						<input type="hidden" name="new_branch_name" v-model="searchTerm">
 						<input type="hidden" name="create_tag" v-model="createTag">
-						{{if $.root.TreePath}}
-							<input type="hidden" name="current_path" value="{{.root.TreePath}}">
-						{{end}}
+						<input type="hidden" name="current_path" v-model="treePath" v-if="treePath">
 					</form>
 				</div>
 			</div>
diff --git a/templates/repo/commit_page.tmpl b/templates/repo/commit_page.tmpl
index 028fdc7e51..f19a4d4223 100644
--- a/templates/repo/commit_page.tmpl
+++ b/templates/repo/commit_page.tmpl
@@ -52,13 +52,13 @@
 										data-modal-cherry-pick-type="revert"
 										data-modal-cherry-pick-header="{{$.locale.Tr "repo.commit.revert-header" (ShortSha .CommitID)}}"
 										data-modal-cherry-pick-content="{{$.locale.Tr "repo.commit.revert-content"}}"
-										data-modal-cherry-pick-submit="{{.locale.Tr "repo.commit.revert"}}">{{.locale.Tr "repo.commit.revert"}}</a></div>
+										data-modal-cherry-pick-submit="{{.locale.Tr "repo.commit.revert"}}">{{.locale.Tr "repo.commit.revert"}}</div>
 									<div class="item cherry-pick-button show-modal"
 										data-modal="#cherry-pick-modal"
 										data-modal-cherry-pick-type="cherry-pick"
 										data-modal-cherry-pick-header="{{$.locale.Tr "repo.commit.cherry-pick-header" (ShortSha .CommitID)}}"
 										data-modal-cherry-pick-content="{{$.locale.Tr "repo.commit.cherry-pick-content"}}"
-										data-modal-cherry-pick-submit="{{.locale.Tr "repo.commit.cherry-pick"}}">{{.locale.Tr "repo.commit.cherry-pick"}}</a></div>
+										data-modal-cherry-pick-submit="{{.locale.Tr "repo.commit.cherry-pick"}}">{{.locale.Tr "repo.commit.cherry-pick"}}</div>
 									<div class="ui basic modal" id="cherry-pick-modal">
 										<div class="ui icon header">
 											<span id="cherry-pick-header"></span>
@@ -66,10 +66,10 @@
 										<div class="content center">
 											<p id="cherry-pick-content" class="branch-dropdown"></p>
 											{{template "repo/branch_dropdown" dict "root" .
-												"noTag" "true" "canCreateBranch" "false"
+												"noTag" true "disableCreateBranch" true
 												"branchForm" "branch-dropdown-form"
 												"branchURLPrefix" (printf "%s/_cherrypick/%s/" $.RepoLink .CommitID) "branchURLSuffix" ""
-												"setAction" "true" "submitForm" "true"}}
+												"setAction" true "submitForm" true}}
 											<form method="GET" action="{{$.RepoLink}}/_cherrypick/{{.CommitID}}/{{if $.BranchName}}{{PathEscapeSegments $.BranchName}}{{else}}{{PathEscapeSegments $.Repository.DefaultBranch}}{{end}}" id="branch-dropdown-form">
 												<input type="hidden" name="ref" value="{{if $.BranchName}}{{$.BranchName}}{{else}}{{$.Repository.DefaultBranch}}{{end}}">
 												<input type="hidden" name="refType" value="branch">
diff --git a/web_src/js/components/RepoBranchTagDropdown.js b/web_src/js/components/RepoBranchTagDropdown.js
index 8bed305fca..e1bf35c129 100644
--- a/web_src/js/components/RepoBranchTagDropdown.js
+++ b/web_src/js/components/RepoBranchTagDropdown.js
@@ -3,43 +3,41 @@ import $ from 'jquery';
 import {vueDelimiters} from './VueComponentLoader.js';
 
 export function initRepoBranchTagDropdown(selector) {
-  $(selector).each(function () {
-    const $dropdown = $(this);
-    const $data = $dropdown.find('.data');
+  $(selector).each(function (dropdownIndex, elRoot) {
     const data = {
+      csrfToken: window.config.csrfToken,
       items: [],
-      mode: $data.data('mode'),
       searchTerm: '',
-      refName: '',
-      noResults: '',
-      canCreateBranch: false,
       menuVisible: false,
       createTag: false,
+      release: null,
+
       isViewTag: false,
       isViewBranch: false,
       isViewTree: false,
+
       active: 0,
-      branchForm: '',
-      branchURLPrefix: '',
-      branchURLSuffix: '',
-      tagURLPrefix: '',
-      tagURLSuffix: '',
-      setAction: false,
-      submitForm: false,
+
+      ...window.config.pageData.branchDropdownDataList[dropdownIndex],
     };
-    $data.find('.item').each(function () {
-      data.items.push({
-        name: $(this).text(),
-        url: $(this).data('url'),
-        branch: $(this).hasClass('branch'),
-        tag: $(this).hasClass('tag'),
-        selected: $(this).hasClass('selected')
-      });
-    });
-    $data.remove();
 
-    // eslint-disable-next-line unicorn/no-this-assignment
-    const elRoot = this;
+    // the "data.defaultBranch" is ambiguous, it could be "branch name" or "tag name"
+
+    if (data.showBranchesInDropdown && data.branches) {
+      for (const branch of data.branches) {
+        data.items.push({name: branch, url: branch, branch: true, tag: false, selected: branch === data.defaultBranch});
+      }
+    }
+    if (!data.noTag && data.tags) {
+      for (const tag of data.tags) {
+        if (data.release) {
+          data.items.push({name: tag, url: tag, branch: false, tag: true, selected: tag === data.release.tagName});
+        } else {
+          data.items.push({name: tag, url: tag, branch: false, tag: true, selected: tag === data.defaultBranch});
+        }
+      }
+    }
+
     const view = createApp({
       delimiters: vueDelimiters,
       data() {
@@ -60,7 +58,7 @@ export function initRepoBranchTagDropdown(selector) {
           return this.filteredItems.length === 0 && !this.showCreateNewBranch;
         },
         showCreateNewBranch() {
-          if (!this.canCreateBranch || !this.searchTerm) {
+          if (this.disableCreateBranch || !this.searchTerm) {
             return false;
           }
 
@@ -77,10 +75,7 @@ export function initRepoBranchTagDropdown(selector) {
       },
 
       beforeMount() {
-        this.noResults = elRoot.getAttribute('data-no-results');
-        this.canCreateBranch = elRoot.getAttribute('data-can-create-branch') === 'true';
-        this.branchForm = elRoot.getAttribute('data-branch-form');
-        switch (elRoot.getAttribute('data-view-type')) {
+        switch (data.viewType) {
           case 'tree':
             this.isViewTree = true;
             break;
@@ -91,14 +86,6 @@ export function initRepoBranchTagDropdown(selector) {
             this.isViewBranch = true;
             break;
         }
-        this.refName = elRoot.getAttribute('data-ref-name');
-        this.branchURLPrefix = elRoot.getAttribute('data-branch-url-prefix');
-        this.branchURLSuffix = elRoot.getAttribute('data-branch-url-suffix');
-        this.tagURLPrefix = elRoot.getAttribute('data-tag-url-prefix');
-        this.tagURLSuffix = elRoot.getAttribute('data-tag-url-suffix');
-        this.setAction = elRoot.getAttribute('data-set-action') === 'true';
-        this.submitForm = elRoot.getAttribute('data-submit-form') === 'true';
-
 
         document.body.addEventListener('click', (event) => {
           if (elRoot.contains(event.target)) return;
@@ -116,7 +103,7 @@ export function initRepoBranchTagDropdown(selector) {
           }
           item.selected = true;
           const url = (item.tag) ? this.tagURLPrefix + item.url + this.tagURLSuffix : this.branchURLPrefix + item.url + this.branchURLSuffix;
-          if (this.branchForm === '') {
+          if (!this.branchForm) {
             window.location.href = url;
           } else {
             this.isViewTree = false;
diff --git a/web_src/js/features/repo-legacy.js b/web_src/js/features/repo-legacy.js
index 5173a5b599..70542ad883 100644
--- a/web_src/js/features/repo-legacy.js
+++ b/web_src/js/features/repo-legacy.js
@@ -485,7 +485,7 @@ export function initRepository() {
   // File list and commits
   if ($('.repository.file.list').length > 0 || $('.branch-dropdown').length > 0 ||
     $('.repository.commits').length > 0 || $('.repository.release').length > 0) {
-    initRepoBranchTagDropdown('.choose.reference .dropdown');
+    initRepoBranchTagDropdown('.choose.reference .ui.dropdown');
   }
 
   // Wiki