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<!DOCTYPE html>
<html lang="en"><head>
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<meta name="author" content="Nicola Rennie">
<title>Introduction to Statistics</title>
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document.querySelectorAll(".qwebr-button-run").forEach((btn) => {
btn.innerHTML = buttonText;
btn.disabled = !enableCodeButton;
});
}
// Function to update the status message in non-interactive cells
globalThis.qwebrUpdateStatusMessage = function(message) {
document.querySelectorAll(".qwebr-status-text.qwebr-cell-needs-evaluation").forEach((elem) => {
elem.innerText = message;
});
}
// Function to update the status message
globalThis.qwebrUpdateStatusHeader = function(message) {
qwebrStartupMessage.innerHTML = `
<i class="fa-solid fa-spinner fa-spin qwebr-icon-status-spinner"></i>
<span>${message}</span>`;
}
// Function that attaches the document status message and diagnostics
function displayStartupMessage(showStartupMessage, showHeaderMessage) {
if (!showStartupMessage) {
return;
}
// Get references to header elements
const headerHTML = document.getElementById("title-block-header");
const headerRevealJS = document.getElementById("title-slide");
// Create the outermost div element for metadata
const quartoTitleMeta = document.createElement("div");
quartoTitleMeta.classList.add("quarto-title-meta");
// Create the first inner div element
const firstInnerDiv = document.createElement("div");
firstInnerDiv.setAttribute("id", "qwebr-status-message-area");
// Create the second inner div element for "WebR Status" heading and contents
const secondInnerDiv = document.createElement("div");
secondInnerDiv.setAttribute("id", "qwebr-status-message-title");
secondInnerDiv.classList.add("quarto-title-meta-heading");
secondInnerDiv.innerText = "WebR Status";
// Create another inner div for contents
const secondInnerDivContents = document.createElement("div");
secondInnerDivContents.setAttribute("id", "qwebr-status-message-body");
secondInnerDivContents.classList.add("quarto-title-meta-contents");
// Describe the WebR state
qwebrStartupMessage.innerText = "🟡 Loading...";
qwebrStartupMessage.setAttribute("id", "qwebr-status-message-text");
// Add `aria-live` to auto-announce the startup status to screen readers
qwebrStartupMessage.setAttribute("aria-live", "assertive");
// Append the startup message to the contents
secondInnerDivContents.appendChild(qwebrStartupMessage);
// Add a status indicator for COOP and COEP Headers if needed
if (showHeaderMessage) {
const crossOriginMessage = document.createElement("p");
crossOriginMessage.innerText = `${crossOriginIsolated ? '🟢' : '🟡'} COOP & COEP Headers`;
crossOriginMessage.setAttribute("id", "qwebr-coop-coep-header");
secondInnerDivContents.appendChild(crossOriginMessage);
}
// Combine the inner divs and contents
firstInnerDiv.appendChild(secondInnerDiv);
firstInnerDiv.appendChild(secondInnerDivContents);
quartoTitleMeta.appendChild(firstInnerDiv);
// Determine where to insert the quartoTitleMeta element
if (headerHTML || headerRevealJS) {
// Append to the existing "title-block-header" element or "title-slide" div
(headerHTML || headerRevealJS).appendChild(quartoTitleMeta);
} else {
// If neither headerHTML nor headerRevealJS is found, insert after "webr-monaco-editor-init" script
const monacoScript = document.getElementById("qwebr-monaco-editor-init");
const header = document.createElement("header");
header.setAttribute("id", "title-block-header");
header.appendChild(quartoTitleMeta);
monacoScript.after(header);
}
}
displayStartupMessage(qwebrShowStartupMessage, qwebrShowHeaderMessage);
</script>
<script type="module">
// Supported Evaluation Types for Context
globalThis.EvalTypes = Object.freeze({
Interactive: 'interactive',
Setup: 'setup',
Output: 'output',
});
// Function that dispatches the creation request
globalThis.qwebrCreateHTMLElement = function (
cellData
) {
// Extract key components
const evalType = cellData.options.context;
const qwebrCounter = cellData.id;
// We make an assumption that insertion points are defined by the Lua filter as:
// qwebr-insertion-location-{qwebrCounter}
const elementLocator = document.getElementById(`qwebr-insertion-location-${qwebrCounter}`);
// Figure out the routine to use to insert the element.
let qwebrElement;
switch ( evalType ) {
case EvalTypes.Interactive:
qwebrElement = qwebrCreateInteractiveElement(qwebrCounter, cellData.options);
break;
case EvalTypes.Output:
qwebrElement = qwebrCreateNonInteractiveOutputElement(qwebrCounter, cellData.options);
break;
case EvalTypes.Setup:
qwebrElement = qwebrCreateNonInteractiveSetupElement(qwebrCounter, cellData.options);
break;
default:
qwebrElement = document.createElement('div');
qwebrElement.textContent = 'Error creating `quarto-webr` element';
}
// Insert the dynamically generated object at the document location.
elementLocator.appendChild(qwebrElement);
};
// Function that setups the interactive element creation
globalThis.qwebrCreateInteractiveElement = function (qwebrCounter, qwebrOptions) {
// Create main div element
var mainDiv = document.createElement('div');
mainDiv.id = 'qwebr-interactive-area-' + qwebrCounter;
mainDiv.className = `qwebr-interactive-area`;
if (qwebrOptions.classes) {
mainDiv.className += " " + qwebrOptions.classes
}
// Add a unique cell identifier that users can customize
if (qwebrOptions.label) {
mainDiv.setAttribute('data-id', qwebrOptions.label);
}
// Create toolbar div
var toolbarDiv = document.createElement('div');
toolbarDiv.className = 'qwebr-editor-toolbar';
toolbarDiv.id = 'qwebr-editor-toolbar-' + qwebrCounter;
// Create a div to hold the left buttons
var leftButtonsDiv = document.createElement('div');
leftButtonsDiv.className = 'qwebr-editor-toolbar-left-buttons';
// Create a div to hold the right buttons
var rightButtonsDiv = document.createElement('div');
rightButtonsDiv.className = 'qwebr-editor-toolbar-right-buttons';
// Create Run Code button
var runCodeButton = document.createElement('button');
runCodeButton.className = 'btn btn-default qwebr-button qwebr-button-run';
runCodeButton.disabled = true;
runCodeButton.type = 'button';
runCodeButton.id = 'qwebr-button-run-' + qwebrCounter;
runCodeButton.textContent = '🟡 Loading webR...';
runCodeButton.title = `Run code (Shift + Enter)`;
// Append buttons to the leftButtonsDiv
leftButtonsDiv.appendChild(runCodeButton);
// Create Reset button
var resetButton = document.createElement('button');
resetButton.className = 'btn btn-light btn-xs qwebr-button qwebr-button-reset';
resetButton.type = 'button';
resetButton.id = 'qwebr-button-reset-' + qwebrCounter;
resetButton.title = 'Start over';
resetButton.innerHTML = '<i class="fa-solid fa-arrows-rotate"></i>';
// Create Copy button
var copyButton = document.createElement('button');
copyButton.className = 'btn btn-light btn-xs qwebr-button qwebr-button-copy';
copyButton.type = 'button';
copyButton.id = 'qwebr-button-copy-' + qwebrCounter;
copyButton.title = 'Copy code';
copyButton.innerHTML = '<i class="fa-regular fa-copy"></i>';
// Append buttons to the rightButtonsDiv
rightButtonsDiv.appendChild(resetButton);
rightButtonsDiv.appendChild(copyButton);
// Create console area div
var consoleAreaDiv = document.createElement('div');
consoleAreaDiv.id = 'qwebr-console-area-' + qwebrCounter;
consoleAreaDiv.className = 'qwebr-console-area';
// Create editor div
var editorDiv = document.createElement('div');
editorDiv.id = 'qwebr-editor-' + qwebrCounter;
editorDiv.className = 'qwebr-editor';
// Create output code area div
var outputCodeAreaDiv = document.createElement('div');
outputCodeAreaDiv.id = 'qwebr-output-code-area-' + qwebrCounter;
outputCodeAreaDiv.className = 'qwebr-output-code-area';
outputCodeAreaDiv.setAttribute('aria-live', 'assertive');
// Create pre element inside output code area
var preElement = document.createElement('pre');
preElement.style.visibility = 'hidden';
outputCodeAreaDiv.appendChild(preElement);
// Create output graph area div
var outputGraphAreaDiv = document.createElement('div');
outputGraphAreaDiv.id = 'qwebr-output-graph-area-' + qwebrCounter;
outputGraphAreaDiv.className = 'qwebr-output-graph-area';
// Append buttons to the toolbar
toolbarDiv.appendChild(leftButtonsDiv);
toolbarDiv.appendChild(rightButtonsDiv);
// Append all elements to the main div
mainDiv.appendChild(toolbarDiv);
consoleAreaDiv.appendChild(editorDiv);
consoleAreaDiv.appendChild(outputCodeAreaDiv);
mainDiv.appendChild(consoleAreaDiv);
mainDiv.appendChild(outputGraphAreaDiv);
return mainDiv;
}
// Function that adds output structure for non-interactive output
globalThis.qwebrCreateNonInteractiveOutputElement = function(qwebrCounter, qwebrOptions) {
// Create main div element
var mainDiv = document.createElement('div');
mainDiv.id = 'qwebr-noninteractive-area-' + qwebrCounter;
mainDiv.className = `qwebr-noninteractive-area`;
if (qwebrOptions.classes) {
mainDiv.className += " " + qwebrOptions.classes
}
// Add a unique cell identifier that users can customize
if (qwebrOptions.label) {
mainDiv.setAttribute('data-id', qwebrOptions.label);
}
// Create a status container div
var statusContainer = createLoadingContainer(qwebrCounter);
// Create output code area div
var outputCodeAreaDiv = document.createElement('div');
outputCodeAreaDiv.id = 'qwebr-output-code-area-' + qwebrCounter;
outputCodeAreaDiv.className = 'qwebr-output-code-area';
outputCodeAreaDiv.setAttribute('aria-live', 'assertive');
// Create pre element inside output code area
var preElement = document.createElement('pre');
preElement.style.visibility = 'hidden';
outputCodeAreaDiv.appendChild(preElement);
// Create output graph area div
var outputGraphAreaDiv = document.createElement('div');
outputGraphAreaDiv.id = 'qwebr-output-graph-area-' + qwebrCounter;
outputGraphAreaDiv.className = 'qwebr-output-graph-area';
// Append all elements to the main div
mainDiv.appendChild(statusContainer);
mainDiv.appendChild(outputCodeAreaDiv);
mainDiv.appendChild(outputGraphAreaDiv);
return mainDiv;
};
// Function that adds a stub in the page to indicate a setup cell was used.
globalThis.qwebrCreateNonInteractiveSetupElement = function(qwebrCounter, qwebrOptions) {
// Create main div element
var mainDiv = document.createElement('div');
mainDiv.id = `qwebr-noninteractive-setup-area-${qwebrCounter}`;
mainDiv.className = `qwebr-noninteractive-setup-area`;
if (qwebrOptions.classes) {
mainDiv.className += " " + qwebrOptions.classes
}
// Add a unique cell identifier that users can customize
if (qwebrOptions.label) {
mainDiv.setAttribute('data-id', qwebrOptions.label);
}
// Create a status container div
var statusContainer = createLoadingContainer(qwebrCounter);
// Append status onto the main div
mainDiv.appendChild(statusContainer);
return mainDiv;
}
// Function to create loading container with specified ID
globalThis.createLoadingContainer = function(qwebrCounter) {
// Create a status container
const container = document.createElement('div');
container.id = `qwebr-non-interactive-loading-container-${qwebrCounter}`;
container.className = 'qwebr-non-interactive-loading-container qwebr-cell-needs-evaluation';
// Create an R project logo to indicate its a code space
const rProjectIcon = document.createElement('i');
rProjectIcon.className = 'fa-brands fa-r-project fa-3x qwebr-r-project-logo';
// Setup a loading icon from font awesome
const spinnerIcon = document.createElement('i');
spinnerIcon.className = 'fa-solid fa-spinner fa-spin fa-1x qwebr-icon-status-spinner';
// Add a section for status text
const statusText = document.createElement('p');
statusText.id = `qwebr-status-text-${qwebrCounter}`;
statusText.className = `qwebr-status-text qwebr-cell-needs-evaluation`;
statusText.innerText = 'Loading webR...';
// Incorporate an inner container
const innerContainer = document.createElement('div');
// Append elements to the inner container
innerContainer.appendChild(spinnerIcon);
innerContainer.appendChild(statusText);
// Append elements to the main container
container.appendChild(rProjectIcon);
container.appendChild(innerContainer);
return container;
}
</script>
<script type="module">
// Function to install a single package
async function qwebrInstallRPackage(packageName) {
await mainWebR.evalRVoid(`webr::install('${packageName}');`);
}
// Function to load a single package
async function qwebrLoadRPackage(packageName) {
await mainWebR.evalRVoid(`require('${packageName}', quietly = TRUE)`);
}
// Generic function to process R packages
async function qwebrProcessRPackagesWithStatus(packages, processType, displayStatusMessageUpdate = true) {
// Switch between contexts
const messagePrefix = processType === 'install' ? 'Installing' : 'Loading';
// Modify button state
qwebrSetInteractiveButtonState(`🟡 ${messagePrefix} package ...`, false);
// Iterate over packages
for (let i = 0; i < packages.length; i++) {
const activePackage = packages[i];
const formattedMessage = `${messagePrefix} package ${i + 1} out of ${packages.length}: ${activePackage}`;
// Display the update in header
if (displayStatusMessageUpdate) {
qwebrUpdateStatusHeader(formattedMessage);
}
// Display the update in non-active areas
qwebrUpdateStatusMessage(formattedMessage);
// Run package installation
if (processType === 'install') {
await qwebrInstallRPackage(activePackage);
} else {
await qwebrLoadRPackage(activePackage);
}
}
// Clean slate
if (processType === 'load') {
await mainWebR.flush();
}
}
// Start a timer
const initializeWebRTimerStart = performance.now();
// Encase with a dynamic import statement
globalThis.qwebrInstance = import(qwebrCustomizedWebROptions.baseURL + "webr.mjs").then(
async ({ WebR, ChannelType }) => {
// Populate WebR options with defaults or new values based on `webr` meta
globalThis.mainWebR = new WebR(qwebrCustomizedWebROptions);
// Initialization WebR
await mainWebR.init();
// Setup a shelter
globalThis.mainWebRCodeShelter = await new mainWebR.Shelter();
// Setup a pager to allow processing help documentation
await mainWebR.evalRVoid('webr::pager_install()');
// Override the existing install.packages() to use webr::install()
await mainWebR.evalRVoid('webr::shim_install()');
// Specify the repositories to pull from
// Note: webR does not use the `repos` option, but instead uses `webr_pkg_repos`
// inside of `install()`. However, other R functions still pull from `repos`.
await mainWebR.evalRVoid(`
options(
webr_pkg_repos = c(${qwebrPackageRepoURLS.map(repoURL => `'${repoURL}'`).join(',')}),
repos = c(${qwebrPackageRepoURLS.map(repoURL => `'${repoURL}'`).join(',')})
)
`);
// Check to see if any packages need to be installed
if (qwebrSetupRPackages) {
// Obtain only a unique list of packages
const uniqueRPackageList = Array.from(new Set(qwebrInstallRPackagesList));
// Install R packages one at a time (either silently or with a status update)
await qwebrProcessRPackagesWithStatus(uniqueRPackageList, 'install', qwebrShowStartupMessage);
if (qwebrAutoloadRPackages) {
// Load R packages one at a time (either silently or with a status update)
await qwebrProcessRPackagesWithStatus(uniqueRPackageList, 'load', qwebrShowStartupMessage);
}
}
}
);
// Stop timer
const initializeWebRTimerEnd = performance.now();
</script>
<script type="module">
// Function to verify a given JavaScript Object is empty
globalThis.qwebrIsObjectEmpty = function (arr) {
return Object.keys(arr).length === 0;
}