1 files changed, 193 insertions, 0 deletions
diff --git a/app/assets/javascripts/create_merge_request_dropdown.js b/app/assets/javascripts/create_merge_request_dropdown.js
new file mode 100644
index 00000000000..ff2f2c81971
--- /dev/null
+++ b/app/assets/javascripts/create_merge_request_dropdown.js
@@ -0,0 +1,193 @@
+/* eslint-disable no-new */
+/* global Flash */
+import DropLab from './droplab/drop_lab';
+import ISetter from './droplab/plugins/input_setter';
+
+// Todo: Remove this when fixing issue in input_setter plugin
+const InputSetter = Object.assign({}, ISetter);
+
+const CREATE_MERGE_REQUEST = 'create-mr';
+const CREATE_BRANCH = 'create-branch';
+
+export default class CreateMergeRequestDropdown {
+  constructor(wrapperEl) {
+    this.wrapperEl = wrapperEl;
+    this.createMergeRequestButton = this.wrapperEl.querySelector('.js-create-merge-request');
+    this.dropdownToggle = this.wrapperEl.querySelector('.js-dropdown-toggle');
+    this.dropdownList = this.wrapperEl.querySelector('.dropdown-menu');
+    this.availableButton = this.wrapperEl.querySelector('.available');
+    this.unavailableButton = this.wrapperEl.querySelector('.unavailable');
+    this.unavailableButtonArrow = this.unavailableButton.querySelector('.fa');
+    this.unavailableButtonText = this.unavailableButton.querySelector('.text');
+
+    this.createBranchPath = this.wrapperEl.dataset.createBranchPath;
+    this.canCreatePath = this.wrapperEl.dataset.canCreatePath;
+    this.createMrPath = this.wrapperEl.dataset.createMrPath;
+    this.droplabInitialized = false;
+    this.isCreatingMergeRequest = false;
+    this.mergeRequestCreated = false;
+    this.isCreatingBranch = false;
+    this.branchCreated = false;
+
+    this.init();
+  }
+
+  init() {
+    this.checkAbilityToCreateBranch();
+  }
+
+  available() {
+    this.availableButton.classList.remove('hide');
+    this.unavailableButton.classList.add('hide');
+  }
+
+  unavailable() {
+    this.availableButton.classList.add('hide');
+    this.unavailableButton.classList.remove('hide');
+  }
+
+  enable() {
+    this.createMergeRequestButton.classList.remove('disabled');
+    this.createMergeRequestButton.removeAttribute('disabled');
+
+    this.dropdownToggle.classList.remove('disabled');
+    this.dropdownToggle.removeAttribute('disabled');
+  }
+
+  disable() {
+    this.createMergeRequestButton.classList.add('disabled');
+    this.createMergeRequestButton.setAttribute('disabled', 'disabled');
+
+    this.dropdownToggle.classList.add('disabled');
+    this.dropdownToggle.setAttribute('disabled', 'disabled');
+  }
+
+  hide() {
+    this.wrapperEl.classList.add('hide');
+  }
+
+  setUnavailableButtonState(isLoading = true) {
+    if (isLoading) {
+      this.unavailableButtonArrow.classList.add('fa-spinner', 'fa-spin');
+      this.unavailableButtonArrow.classList.remove('fa-exclamation-triangle');
+      this.unavailableButtonText.textContent = 'Checking branch availability…';
+    } else {
+      this.unavailableButtonArrow.classList.remove('fa-spinner', 'fa-spin');
+      this.unavailableButtonArrow.classList.add('fa-exclamation-triangle');
+      this.unavailableButtonText.textContent = 'New branch unavailable';
+    }
+  }
+
+  checkAbilityToCreateBranch() {
+    return $.ajax({
+      type: 'GET',
+      dataType: 'json',
+      url: this.canCreatePath,
+      beforeSend: () => this.setUnavailableButtonState(),
+    })
+    .done((data) => {
+      this.setUnavailableButtonState(false);
+
+      if (data.can_create_branch) {
+        this.available();
+        this.enable();
+
+        if (!this.droplabInitialized) {
+          this.droplabInitialized = true;
+          this.initDroplab();
+          this.bindEvents();
+        }
+      } else if (data.has_related_branch) {
+        this.hide();
+      }
+    }).fail(() => {
+      this.unavailable();
+      this.disable();
+      new Flash('Failed to check if a new branch can be created.');
+    });
+  }
+
+  initDroplab() {
+    this.droplab = new DropLab();
+
+    this.droplab.init(this.dropdownToggle, this.dropdownList, [InputSetter],
+      this.getDroplabConfig());
+  }
+
+  getDroplabConfig() {
+    return {
+      InputSetter: [{
+        input: this.createMergeRequestButton,
+        valueAttribute: 'data-value',
+        inputAttribute: 'data-action',
+      }, {
+        input: this.createMergeRequestButton,
+        valueAttribute: 'data-text',
+      }],
+    };
+  }
+
+  bindEvents() {
+    this.createMergeRequestButton
+      .addEventListener('click', this.onClickCreateMergeRequestButton.bind(this));
+  }
+
+  isBusy() {
+    return this.isCreatingMergeRequest ||
+      this.mergeRequestCreated ||
+      this.isCreatingBranch ||
+      this.branchCreated;
+  }
+
+  onClickCreateMergeRequestButton(e) {
+    let xhr = null;
+    e.preventDefault();
+
+    if (this.isBusy()) {
+      return;
+    }
+
+    if (e.target.dataset.action === CREATE_MERGE_REQUEST) {
+      xhr = this.createMergeRequest();
+    } else if (e.target.dataset.action === CREATE_BRANCH) {
+      xhr = this.createBranch();
+    }
+
+    xhr.fail(() => {
+      this.isCreatingMergeRequest = false;
+      this.isCreatingBranch = false;
+    });
+
+    xhr.always(() => this.enable());
+
+    this.disable();
+  }
+
+  createMergeRequest() {
+    return $.ajax({
+      method: 'POST',
+      dataType: 'json',
+      url: this.createMrPath,
+      beforeSend: () => (this.isCreatingMergeRequest = true),
+    })
+    .done((data) => {
+      this.mergeRequestCreated = true;
+      window.location.href = data.url;
+    })
+    .fail(() => new Flash('Failed to create Merge Request. Please try again.'));
+  }
+
+  createBranch() {
+    return $.ajax({
+      method: 'POST',
+      dataType: 'json',
+      url: this.createBranchPath,
+      beforeSend: () => (this.isCreatingBranch = true),
+    })
+    .done((data) => {
+      this.branchCreated = true;
+      window.location.href = data.url;
+    })
+    .fail(() => new Flash('Failed to create a branch for this issue. Please try again.'));
+  }
+}