136 lines
3.9 KiB
JavaScript
136 lines
3.9 KiB
JavaScript
/**
|
|
* Copyright 2015 Google Inc. All Rights Reserved.
|
|
*
|
|
* Licensed under the Apache License, Version 2.0 (the "License");
|
|
* you may not use this file except in compliance with the License.
|
|
* You may obtain a copy of the License at
|
|
*
|
|
* http://www.apache.org/licenses/LICENSE-2.0
|
|
*
|
|
* Unless required by applicable law or agreed to in writing, software
|
|
* distributed under the License is distributed on an "AS IS" BASIS,
|
|
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
|
|
* See the License for the specific language governing permissions and
|
|
* limitations under the License.
|
|
*/
|
|
|
|
function MaterialComponents() {
|
|
'use strict';
|
|
|
|
this.element_ = document.querySelector('.mdl-js-components');
|
|
this.componentLinks = this.element_.querySelectorAll('.mdl-components__link');
|
|
|
|
this.activeLink = null;
|
|
this.activePage = null;
|
|
|
|
this.init();
|
|
}
|
|
|
|
/**
|
|
* Stores a Map of the components links using their corresponding hashFragment
|
|
* as key.
|
|
* @type {Object.<string, HTMLElement>}
|
|
* @private
|
|
*/
|
|
MaterialComponents.prototype.linksMap_ = {};
|
|
|
|
/**
|
|
* Store strings for class names defined by this component that are used in
|
|
* JavaScript. This allows us to simply change it in one place should we
|
|
* decide to modify at a later date.
|
|
* @enum {string}
|
|
* @private
|
|
*/
|
|
MaterialComponents.prototype.CssClasses_ = {
|
|
ACTIVE: 'is-active'
|
|
};
|
|
|
|
/**
|
|
* Initializes the MaterialComponents component.
|
|
*/
|
|
MaterialComponents.prototype.init = function() {
|
|
'use strict';
|
|
|
|
this.activeLink = this.componentLinks[0];
|
|
this.activePage = this.findPage(this.activeLink);
|
|
|
|
for (var i = 0; i < this.componentLinks.length; i++) {
|
|
this.componentLinks[i].addEventListener('click',
|
|
this.clickHandler(this.componentLinks[i]));
|
|
// Mapping the list of links using their hash fragment.
|
|
this.linksMap_["#" + this.componentLinks[i].href.split("#")[1]]
|
|
= this.componentLinks[i];
|
|
}
|
|
|
|
// If a Hash fragment is available on the page then display the section.
|
|
this.displaySectionForFragment(window.location.hash);
|
|
|
|
// If the hash fragment changes we display the corresponding section.
|
|
// We won't support older browser as it's not efficient.
|
|
if ("onhashchange" in window) {
|
|
var this_ = this;
|
|
window.onhashchange = function () {
|
|
this_.displaySectionForFragment(window.location.hash);
|
|
}
|
|
}
|
|
};
|
|
|
|
/**
|
|
* Displays the section for the given hash fragment.
|
|
* @param {String} fragment The hash fragment used in the link to the section
|
|
*/
|
|
MaterialComponents.prototype.displaySectionForFragment = function(fragment) {
|
|
if (fragment
|
|
&& this.linksMap_[fragment]
|
|
&& this.linksMap_[fragment].click) {
|
|
this.linksMap_[fragment].click();
|
|
}
|
|
};
|
|
|
|
/**
|
|
* Returns a clickHandler for a navigation link.
|
|
* @param {HTMLElement} link the navigation link
|
|
* @return {function} the click handler
|
|
*/
|
|
MaterialComponents.prototype.clickHandler = function(link) {
|
|
'use strict';
|
|
|
|
var ctx = this;
|
|
|
|
return function(e) {
|
|
e.preventDefault();
|
|
var page = ctx.findPage(link);
|
|
ctx.activePage.classList.remove(ctx.CssClasses_.ACTIVE);
|
|
ctx.activeLink.classList.remove(ctx.CssClasses_.ACTIVE);
|
|
|
|
ctx.activePage = page;
|
|
ctx.activeLink = link;
|
|
|
|
link.classList.add(ctx.CssClasses_.ACTIVE);
|
|
page.classList.add(ctx.CssClasses_.ACTIVE);
|
|
|
|
// Add an history entry and display the hash fragment in the URL.
|
|
if (window.location.hash != "#"+link.href.split("#")[1]) {
|
|
history.pushState(null, "Material Design Lite", link);
|
|
}
|
|
};
|
|
};
|
|
|
|
/**
|
|
* Finds the corresponding page for a navigation link.
|
|
* @param {HTMLElement} link the navigation link
|
|
* @return {HTMLElement} the corresponding page
|
|
*/
|
|
MaterialComponents.prototype.findPage = function(link) {
|
|
'use strict';
|
|
|
|
var href = link.href.split('#')[1];
|
|
return this.element_.querySelector('#' + href);
|
|
};
|
|
|
|
window.addEventListener('load', function() {
|
|
'use strict';
|
|
|
|
new MaterialComponents();
|
|
});
|