blob: 11f2a5a7f7b429e7dfc628dde992c98be1bb6e1e [file] [log] [blame]
class DownloadsController {
constructor() {
// Parts of tabbed section.
this.tablist = document.querySelector('.js-tabSection');
this.tabs = this.tablist.querySelectorAll('[role="tab"]');
this.panels = document.querySelectorAll('[role="tabpanel"]');
// OS for which to display download and install steps.
this.osName = 'Unknown OS';
// URL to JSON containing list of installer downloads.
const fileListUrl = 'https://golang.org/dl/?mode=json';
this.activeTabIndex = 0;
// Get the install file list, then get names and sizes
// for each OS supported on the install page.
fetch(fileListUrl)
.then((response) => response.json())
.then((data) => {
const files = data[0]['files'];
for (var i = 0; i < files.length; i++) {
let file = files[i].filename;
let fileSize = files[i].size;
if (file.match('.linux-amd64.tar.gz$')) {
this.linuxFileName = file;
this.linuxFileSize = Math.round(fileSize / Math.pow(1024, 2));
}
if (file.match('.darwin-amd64(-osx10.8)?.pkg$')) {
this.macFileName = file;
this.macFileSize = Math.round(fileSize / Math.pow(1024, 2));
}
if (file.match('.windows-amd64.msi$')) {
this.windowsFileName = file;
this.windowsFileSize = Math.round(fileSize / Math.pow(1024, 2));
}
}
this.detectOS();
const osTab = document.getElementById(this.osName);
if (osTab !== null) {
osTab.click();
}
this.setDownloadForOS(this.osName);
})
.catch(console.error);
this.setEventListeners();
}
setEventListeners() {
this.tabs.forEach((tabEl) => {
tabEl.addEventListener('click', e => this.handleTabClick((e)));
});
}
// Set the download button UI for a specific OS.
setDownloadForOS(osName) {
const baseURL = 'https://golang.org/dl/';
let download;
switch(osName){
case 'linux':
document.querySelector('.js-downloadButton').textContent =
'Download Go for Linux';
document.querySelector('.js-downloadDescription').textContent =
this.linuxFileName + ' (' + this.linuxFileSize + ' MB)';
document.querySelector('.js-download').href = baseURL + this.linuxFileName;
break;
case 'mac':
document.querySelector('.js-downloadButton').textContent =
'Download Go for Mac';
document.querySelector('.js-downloadDescription').textContent =
this.macFileName + ' (' + this.macFileSize + ' MB)';
document.querySelector('.js-download').href = baseURL + this.macFileName;
break;
case 'windows':
document.querySelector('.js-downloadButton').textContent =
'Download Go for Windows';
document.querySelector('.js-downloadDescription').textContent =
this.windowsFileName + ' (' + this.windowsFileSize + ' MB)';
document.querySelector('.js-download').href = baseURL + this.windowsFileName;
break;
default:
document.querySelector('.js-downloadButton').textContent = 'Download Go';
document.querySelector('.js-downloadDescription').textContent =
'Visit the downloads page.';
document.querySelector('.js-download').href = baseURL;
break;
}
}
// Updates install tab with dynamic data.
setInstallTabData(osName) {
const fnId = `#${osName}-filename`;
const el = document.querySelector(fnId);
if (!el) {
return;
}
switch(osName) {
case 'linux':
// Update filename for linux installation step
if (this.linuxFileName) {
el.textContent = this.linuxFileName;
}
break;
}
}
// Detect the users OS for installation default.
detectOS() {
if (navigator.userAgent.indexOf('Linux') !== -1) {
this.osName = 'linux';
} else if (navigator.userAgent.indexOf('Mac') !== -1) {
this.osName = 'mac';
} else if (navigator.userAgent.indexOf('X11') !== -1) {
this.osName = 'unix';
} else if (navigator.userAgent.indexOf('Win') !== -1) {
this.osName = 'windows';
}
}
// Activates the tab at the given index.
activateTab(index) {
this.tabs[this.activeTabIndex].setAttribute('aria-selected', 'false');
this.tabs[this.activeTabIndex].setAttribute('tabindex', '-1');
this.panels[this.activeTabIndex].setAttribute('hidden', '');
this.tabs[index].setAttribute('aria-selected', 'true');
this.tabs[index].setAttribute('tabindex', '0');
this.panels[index].removeAttribute('hidden');
this.tabs[index].focus();
this.activeTabIndex = index;
}
// Handles clicks on tabs.
handleTabClick(e) {
const el = (e.target);
this.activateTab(Array.prototype.indexOf.call(this.tabs, el));
this.setDownloadForOS(el.id);
this.setInstallTabData(el.id);
}
}
// Instantiate controller for page event handling.
new DownloadsController();