125 lines
3.7 KiB
JavaScript
125 lines
3.7 KiB
JavaScript
window.addEventListener('load', function() { new MaterialComponents(); });
|
|
|
|
function MaterialComponents() {
|
|
'use strict';
|
|
|
|
this.activeComponent = '';
|
|
this.contentElement = document.getElementsByClassName('content')[0];
|
|
this.isMobile = false;
|
|
this.layoutElement = document.getElementsByClassName('mdl-layout')[0];
|
|
this.mobileMediaQuery = window.matchMedia('(max-width: 850px)');
|
|
this.componentLinks = document.getElementsByClassName('mdl-components__link');
|
|
this.stuck = false;
|
|
this.scrollResized = false;
|
|
|
|
this.init();
|
|
}
|
|
|
|
/**
|
|
* Initializes the MaterialComponents component.
|
|
*/
|
|
MaterialComponents.prototype.init = function() {
|
|
var self = this;
|
|
var scroll = document.getElementsByClassName('mdl-components')[0];
|
|
|
|
// Check for mobile viewport on load.
|
|
this.checkMobile(this.mobileMediaQuery);
|
|
|
|
// Check for loading element and bind event listeners.
|
|
for (var i = 0, link; link = this.componentLinks[i]; i++) {
|
|
if (link.getAttribute('href') === location.hash) {
|
|
this.setActiveState(link.getAttribute('href').substring(1));
|
|
|
|
// Set the scroll position to the active link.
|
|
scroll.scrollLeft = link.offsetLeft;
|
|
}
|
|
link.addEventListener('click', function() {
|
|
self.setActiveState(this.getAttribute('href').substring(1));
|
|
});
|
|
}
|
|
|
|
// Watch for scrolling.
|
|
this.layoutElement.addEventListener('scroll', this.stickyHeader.bind(this));
|
|
|
|
// Watch for viewport changes.
|
|
this.mobileMediaQuery.addListener(this.checkMobile.bind(this));
|
|
};
|
|
|
|
/**
|
|
* Calculates the width of the scrolling div on mobile and sets an appropriate
|
|
* media query.
|
|
*/
|
|
MaterialComponents.prototype.calculateScrollSize = function() {
|
|
var scrollWidth = 5;
|
|
|
|
for (var i = 0, componentLink;
|
|
componentLink = this.componentLinks[i]; i++) { scrollWidth +=
|
|
componentLink.offsetWidth;
|
|
}
|
|
|
|
var styleElement = document.createElement('style');
|
|
styleElement.textContent = '@media (max-width: 850px) { ' +
|
|
'.mdl-components .scroll { width: ' + scrollWidth + 'px; } }';
|
|
document.body.appendChild(styleElement);
|
|
|
|
this.scrollResized = true;
|
|
};
|
|
|
|
/**
|
|
* Checks to see if the viewport is mobile, and triggers the scroll div
|
|
* resizing the first time.
|
|
*/
|
|
MaterialComponents.prototype.checkMobile = function(mediaQuery) {
|
|
this.isMobile = mediaQuery.matches;
|
|
if (this.isMobile) {
|
|
if(!this.scrollResized) { this.calculateScrollSize(); }
|
|
this.stickyHeader();
|
|
}
|
|
};
|
|
|
|
MaterialComponents.prototype.removeActiveState = function() {
|
|
var activeComponents =
|
|
document.getElementsByClassName('mdl-component active');
|
|
|
|
while (activeComponents.length) {
|
|
activeComponents[0].classList.remove('active');
|
|
}
|
|
};
|
|
|
|
/**
|
|
* Method for selecting a component to view with the navigation.
|
|
*/
|
|
MaterialComponents.prototype.setActiveState = function(componentName) {
|
|
if (this.activeComponent != componentName) {
|
|
this.activeComponent = componentName;
|
|
|
|
var activeComponentElements =
|
|
document.getElementsByClassName('mdl-component ' + componentName);
|
|
var activeLeft = 0;
|
|
|
|
if (activeComponentElements.length) {
|
|
this.removeActiveState();
|
|
for (var i = 0, component; component = activeComponentElements[i]; i++) {
|
|
component.classList.add('active');
|
|
}
|
|
}
|
|
}
|
|
};
|
|
|
|
/**
|
|
* Watches for the header scrolling on mobile and makes the top nav sticky if
|
|
* the page is scrolled beyond the main navigation.
|
|
*/
|
|
MaterialComponents.prototype.stickyHeader = function() {
|
|
var distance = this.contentElement.offsetTop - this.layoutElement.scrollTop;
|
|
|
|
if ((distance <= 0) && !this.stuck) {
|
|
this.contentElement.classList.add('sticky');
|
|
this.stuck = true;
|
|
} else if (this.stuck &&
|
|
(this.layoutElement.scrollTop <= this.contentElement.offsetTop)) {
|
|
this.contentElement.classList.remove('sticky');
|
|
this.stuck = false;
|
|
}
|
|
};
|