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gaia/shared/elements/gaia_switch/script.js

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+'use strict';
+/* global ComponentUtils */
+
+window.GaiaSwitch = (function(win) {
+  // Extend from the HTMLElement prototype
+  var proto = Object.create(HTMLElement.prototype);
+
+  // Allow baseurl to be overridden (used for demo page)
+  var baseurl = window.GaiaSwitchBaseurl ||
+    '/shared/elements/gaia_switch/';
+
+  proto.createdCallback = function() {
+    var shadow = this.createShadowRoot();
+    this._template = template.content.cloneNode(true);
+    this._input = this._template.querySelector('input[type="checkbox"]');
+
+    var checked = this.getAttribute('checked');
+    if (checked !== null) {
+      this._input.checked = true;
+    }
+
+    var wrapper = this._template.getElementById('switch');
+    wrapper.addEventListener('click', this.handleClick.bind(this));
+
+    shadow.appendChild(this._template);
+
+    ComponentUtils.style.call(this, baseurl);
+
+    // Proxy RTL changes to the shadow root so we can style for RTL.
+    var dirObserver = new MutationObserver(this.updateInternalDir.bind(this));
+    dirObserver.observe(document.documentElement, {
+      attributeFilter: ['dir'],
+      attributes: true
+    });
+    this.updateInternalDir();
+  };
+
+  proto.updateInternalDir = function() {
+    var internal = this.shadowRoot.firstElementChild;
+    if (document.documentElement.dir === 'rtl') {
+      internal.setAttribute('dir', 'rtl');
+    } else {
+      internal.removeAttribute('dir');
+    }
+  };
+
+  proto.handleClick = function(e) {
+    // If user clicked the (optional) link, do not toggle gaia-switch.
+    if (e && e.target.tagName === 'A') {
+      return;
+    }
+
+    e && e.preventDefault();
+    e && e.stopImmediatePropagation();
+
+    // Dispatch a click event.
+    var event = new MouseEvent('click', {
+      view: window,
+      bubbles: true,
+      cancelable: true
+    });
+    this.dispatchEvent(event);
+
+    if (!event.defaultPrevented) {
+      this.checked = !this.checked;
+    }
+
+    // Dispatch a change event for the gaia-switch.
+    this.dispatchEvent(new CustomEvent('change', {
+      bubbles: true,
+      cancelable: false
+    }));
+  };
+
+  /**
+   * Allows users to simulate clicking through javascript.
+   */
+  proto.click = function() {
+    this.handleClick();
+  };
+
+  /**
+   * Proxy the checked property to the input element.
+   */
+  Object.defineProperty( proto, 'checked', {
+    get: function() {
+      return this._input.checked;
+    },
+    set: function(value) {
+      this._input.checked = value;
+    }
+  });
+
+  /**
+   * Disabled setter
+   */
+  Object.defineProperty( proto, 'disabled', {
+    get: function() {
+      return this.hasAttribute('disabled');
+    },
+    set: function(value) {
+      if (value) {
+        this.setAttribute('disabled', true);
+      } else {
+        this.removeAttribute('disabled');
+      }
+    }
+  });
+
+  /**
+   * Proxy the name property to the input element.
+   */
+  Object.defineProperty( proto, 'name', {
+    get: function() {
+      return this.getAttribute('name');
+    },
+    set: function(value) {
+      this.setAttribute('name', value);
+    }
+  });
+
+  /**
+   * Proxy the input type.
+   */
+  Object.defineProperty( proto, 'type', {
+    get: function() {
+      return 'gaia-switch';
+    }
+  });
+
+  // HACK: Create a <template> in memory at runtime.
+  // When the custom-element is created we clone
+  // this template and inject into the shadow-root.
+  // Prior to this we would have had to copy/paste
+  // the template into the <head> of every app that
+  // wanted to use <gaia-switch>, this would make
+  // markup changes complicated, and could lead to
+  // things getting out of sync. This is a short-term
+  // hack until we can import entire custom-elements
+  // using HTML Imports (bug 877072).
+  var template = document.createElement('template');
+  template.innerHTML = `<span id="switch">
+      <input type="checkbox">
+      <span><content select="label"></content></span>
+      <div class="details"><content select="details"></content></div>
+      <content select="a"></content>
+    </span>`;
+
+  // Register and return the constructor
+  return document.registerElement('gaia-switch', { prototype: proto });
+})(window);