1 files changed, 152 insertions, 0 deletions
diff --git a/app/assets/javascripts/blob/target_branch_dropdown.js b/app/assets/javascripts/blob/target_branch_dropdown.js
new file mode 100644
index 00000000000..216f069ef71
--- /dev/null
+++ b/app/assets/javascripts/blob/target_branch_dropdown.js
@@ -0,0 +1,152 @@
+/* eslint-disable class-methods-use-this */
+const SELECT_ITEM_MSG = 'Select';
+
+class TargetBranchDropDown {
+  constructor(dropdown) {
+    this.dropdown = dropdown;
+    this.$dropdown = $(dropdown);
+    this.fieldName = this.dropdown.getAttribute('data-field-name');
+    this.form = this.dropdown.closest('form');
+    this.createDropdown();
+  }
+
+  static bootstrap() {
+    const dropdowns = document.querySelectorAll('.js-project-branches-dropdown');
+    [].forEach.call(dropdowns, dropdown => new TargetBranchDropDown(dropdown));
+  }
+
+  createDropdown() {
+    const self = this;
+    this.$dropdown.glDropdown({
+      selectable: true,
+      filterable: true,
+      search: {
+        fields: ['title'],
+      },
+      data: (term, callback) => $.ajax({
+        url: self.dropdown.getAttribute('data-refs-url'),
+        data: {
+          ref: self.dropdown.getAttribute('data-ref'),
+          show_all: true,
+        },
+        dataType: 'json',
+      }).done(refs => callback(self.dropdownData(refs))),
+      toggleLabel(item, el) {
+        if (el.is('.is-active')) {
+          return item.text;
+        }
+        return SELECT_ITEM_MSG;
+      },
+      clicked(item, el, e) {
+        e.preventDefault();
+        self.onClick.call(self);
+      },
+      fieldName: self.fieldName,
+    });
+    return new gl.CreateBranchDropdown(this.form.querySelector('.dropdown-new-branch'), this);
+  }
+
+  onClick() {
+    this.enableSubmit();
+    this.$dropdown.trigger('change.branch');
+  }
+
+  enableSubmit() {
+    const submitBtn = this.form.querySelector('[type="submit"]');
+    if (this.branchInput && this.branchInput.value) {
+      submitBtn.removeAttribute('disabled');
+    } else {
+      submitBtn.setAttribute('disabled', '');
+    }
+  }
+
+  dropdownData(refs) {
+    const branchList = this.dropdownItems(refs);
+    this.cachedRefs = refs;
+    this.addDefaultBranch(branchList);
+    this.addNewBranch(branchList);
+    return { Branches: branchList };
+  }
+
+  dropdownItems(refs) {
+    return refs.map(this.dropdownItem);
+  }
+
+  dropdownItem(ref) {
+    return { id: ref, text: ref, title: ref };
+  }
+
+  addDefaultBranch(branchList) {
+    // when no branch is selected do nothing
+    if (!this.branchInput) {
+      return;
+    }
+
+    const branchInputVal = this.branchInput.value;
+    const currentBranchIndex = this.searchBranch(branchList, branchInputVal);
+
+    if (currentBranchIndex === -1) {
+      this.unshiftBranch(branchList, this.dropdownItem(branchInputVal));
+    }
+  }
+
+  addNewBranch(branchList) {
+    if (this.newBranch) {
+      this.unshiftBranch(branchList, this.newBranch);
+    }
+  }
+
+  searchBranch(branchList, branchName) {
+    return _.findIndex(branchList, el => branchName === el.id);
+  }
+
+  unshiftBranch(branchList, branch) {
+    const branchIndex = this.searchBranch(branchList, branch.id);
+
+    if (branchIndex === -1) {
+      branchList.unshift(branch);
+    }
+  }
+
+  setNewBranch(newBranchName) {
+    this.newBranch = this.dropdownItem(newBranchName);
+    this.refreshData();
+    this.selectBranch(this.searchBranch(this.glDropdown.fullData.Branches, newBranchName));
+  }
+
+  refreshData() {
+    this.glDropdown.fullData = this.dropdownData(this.cachedRefs);
+    this.clearFilter();
+  }
+
+  clearFilter() {
+    // apply an empty filter in order to refresh the data
+    this.glDropdown.filter.filter('');
+    this.dropdown.closest('.dropdown').querySelector('.dropdown-page-one .dropdown-input-field').value = '';
+  }
+
+  selectBranch(index) {
+    const branch = this.dropdown.closest('.dropdown').querySelectorAll('li a')[index];
+
+    if (!branch.classList.contains('is-active')) {
+      branch.click();
+    } else {
+      this.closeDropdown();
+    }
+  }
+
+  closeDropdown() {
+    this.dropdown.closest('.dropdown').querySelector('.dropdown-menu-close').click();
+  }
+
+  get branchInput() {
+    return this.form.querySelector(`input[name="${this.fieldName}"]`);
+  }
+
+  get glDropdown() {
+    return this.$dropdown.data('glDropdown');
+  }
+}
+
+window.gl = window.gl || {};
+gl.TargetBranchDropDown = TargetBranchDropDown;