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You'll gain real-world insights into how economics impacts your daily life with this easy-to-follow online course. This crash course is based on the acclaimed textbook Economy, Society, and Public Policy by CORE Econ, tailored to help you grasp key concepts without feeling overwhelmed.

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Dear reader,

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"))})),el=vwo_$("#tfa_134-L > b:nth-of-type(1)");})("#tfa_134-L > b:nth-of-type(1)")}}, C_940895_62_1_2_0:{ fn:function(log,nonce=''){return (function(x) {var el,ctx=vwo_$(x); /*vwo_debug log("visibility","H1:tm('Support The Splendid Table Today')"); vwo_debug*/(el=vwo_$("H1:tm('Support The Splendid Table Today')")).vwoCss({visibility:"hidden !important"}),(el=vwo_$("H1:tm('Support The Splendid Table Today')")).vwoCss({display:"none !important"});})("H1:tm('Support The Splendid Table Today')")}}, R_940895_62_1_2_0:{ fn:function(log,nonce=''){return (function(x) { if(!vwo_$.fn.vwoRevertHtml){ return; }; var el,ctx=vwo_$(x); /*vwo_debug log("Revert","remove","H1:tm('Support The Splendid Table Today')"); vwo_debug*/(el=vwo_$("H1:tm('Support The Splendid Table Today')")).vwoRevertCss(),(el=vwo_$("H1:tm('Support The Splendid Table Today')")).vwoRevertCss();})("H1:tm('Support The Splendid Table Today')")}}, C_940895_62_1_2_1:{ fn:function(log,nonce=''){return (function(x) {var el,ctx=vwo_$(x); /*vwo_debug log("editElement","STRONG:tm('Success! 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You’re subscribed!')")}}, C_940895_39_1_2_0:{ fn:function(log,nonce=''){return (function(x) { try{ var _vwo_sel = vwo_$("`); !vwo_$("head").find('#1740425171461').length && vwo_$('head').append(_vwo_sel);}catch(e) {console.error(e)} try{}catch(e) {console.error(e)} try{const getCurrentDate = (d = new Date()) => d.toISOString().split('T')[0]; function vwoCustomEvent (labelValue) { window.VWO = window.VWO || []; VWO.event = VWO.event || function () {VWO.push(["event"].concat([].slice.call(arguments)))}; VWO.event("customEvent", { "label": labelValue.toString() }); } class RadioButtonComponent { constructor (element) { this.radio = element.querySelector('input[type="radio"]'); this.label = element.querySelector('label'); } get value () { let value = this.radio.value; if (Number.isNaN(parseFloat(value))) return value; if (parseFloat(value) % 1 == 0) return parseInt(value); return parseFloat(value); } set value (newValue) { this.radio.value = newValue; } get text () { return this.label.textContent; } set text (newText) { if (this.label.querySelector('.form-required')) { const labelTextNode = [...this.label.childNodes].filter(({ nodeType }) => nodeType === Node.TEXT_NODE)[0]; labelTextNode.nodeValue = newText; } else { this.label.textContent = newText; } } get checked () { return this.radio.checked; } set checked (bool) { this.click(), bool === true && this.radio.checked === true; } click () { this.label.click(); } select () { this.click(); } addEventListener (eventType, callbackFunction) { switch (eventType) { case 'click': this.label.addEventListener(eventType, callbackFunction); case 'change': default: this.radio.addEventListener(eventType, callbackFunction); } } } class TextFieldComponent { constructor (element) { this.input = element.querySelector('input[type="text"]'); this.label = element.querySelector('label'); } get value () { return this.input.value; } set value (newValue) { this.input.dispatchEvent(new Event('focus')); this.input.value = newValue; this.input.dispatchEvent(new Event('keyup')); this.input.dispatchEvent(new Event('change')); this.input.dispatchEvent(new Event('blur')); } get text () { return this.input.placeholder; } set text (newText) { this.input.placeholder = newText; } addEventListener (eventType, callbackFunction) { this.input.addEventListener(eventType, callbackFunction); } } class GiftArrayButton extends RadioButtonComponent { constructor (element) { super(element); } get amount () { return this.value; } set amount (newAmount) { if (Number.isNaN(parseInt(newAmount)) || parseInt(newAmount) <= 0) throw new Error("New amount must be a valid number greater than 0."); newAmount = parseInt(newAmount); this.text = '$' + newAmount; this.value = newAmount; } } class GiftArrayOtherAmount extends TextFieldComponent { constructor (element) { super(element); } get amount () { return parseFloat(this.value); } set amount (newAmount) { if (Number.isNaN(parseInt(newAmount)) || parseInt(newAmount) <= 0) throw new Error("New amount must be a valid number greater than 0."); newAmount = parseFloat(newAmount); this.value = newAmount; this.input.dispatchEvent(new Event('updateSummary')); } } class GiftArray extends Array { constructor (items) { if (!Array.isArray(items) && items.length === 0) { throw new Error("GiftArray: Arugment 1 is not an instance of Array with a length greater than 0:" + items.join(', ')); } if (items.every((item) => item instanceof GiftArrayButton || item instanceof GiftArrayOtherAmount)) { if (items.find((item) => item instanceof GiftArrayOtherAmount)) { let temp = items.find((item) => item instanceof GiftArrayOtherAmount); items = items.filter((item) => item instanceof GiftArrayButton); items.push(temp); } } else if (items.every((item) => item instanceof HTMLElement)) { items = items.map((item) => item.matches(".webform-component-textfield") ? new GiftArrayOtherAmount(item) : new GiftArrayButton(item)); } else { throw new Error("GiftArray: Arugment 1 is not of type HTMLElement, HTMLElement[], or GiftArrayButton|GiftArrayButton[]:" + items.join(', ')); } super(...items); this.Buttons = items.filter((item) => item instanceof GiftArrayButton); this.OtherAmountInput = items.find((item) => item instanceof GiftArrayOtherAmount); } get amount () { const activeButton = this.Buttons.find((item) => item.checked); if (activeButton.value === "other") { const otherButton = activeButton; if (!otherButton) { throw new Error("GiftArray.amount: Other Button was not defined."); } otherButton.click(); return this.OtherAmountInput.value; } else { return activeButton.value; } } set amount (newAmount) { if (Number.isNaN(parseInt(newAmount)) || parseInt(newAmount) <= 0) throw new Error("New amount must be a valid number greater than 0."); newAmount = parseFloat(newAmount); const matchingButton = this.find((item) => item.value === newAmount); if (matchingButton) { matchingButton.click(); } else { const otherButton = this.Buttons.find((item) => item.value === "other"); otherButton.click(); this.OtherAmountInput.amount = newAmount; } } addEventListeners (eventType, callbackFunction, filter = undefined) { if (filter && typeof filter === 'function') { const filteredItems = this.filter((item) => filter.call(this, item)); filteredItems.forEach((item) => item.addEventListener(eventType, callbackFunction)); } else if (filter && typeof filter === 'string') { if (filter.match(/buttons/gmi)) this.Buttons.forEach((item) => item.addEventListener(eventType, callbackFunction)); if (filter.match(/other/gmi)) this.OtherAmountInput.addEventListener(eventType, callbackFunction); } else { this.forEach((item) => item.addEventListener(eventType, callbackFunction)); } } } class FrequencyButton extends RadioButtonComponent { constructor (element) { super(element); } get frequency () { return this.text.match(/Monthly/gmi) ? "Monthly" : "One-Time"; } set freqency (newAmount) { if (Number.isNaN(parseInt(newAmount)) || parseInt(newAmount) <= 0) throw new Error("New amount must be a valid number greater than 0."); newAmount = parseInt(newAmount); this.text = '$' + newAmount; this.value = newAmount; } } class FrequencyArray extends Array { constructor (items) { if (!Array.isArray(items) && items.length === 0) { throw new Error("FrequencyArray: Arugment 1 is not an instance of Array with a length greater than 0:" + items.join(', ')); } /*if (items.every((item) => item instanceof GiftArrayButton || item instanceof GiftArrayOtherAmount)) { if (items.find((item) => item instanceof GiftArrayOtherAmount)) { let temp = items.find((item) => item instanceof GiftArrayOtherAmount); items = items.filter((item) => item instanceof GiftArrayButton); items.push(temp); } } else*/ if (items.every((item) => item instanceof HTMLElement)) { items = items.map((item) => item.matches(".webform-component-textfield") ? new GiftArrayOtherAmount(item) : new GiftArrayButton(item)); } else { throw new Error("FrequencyArray: Arugment 1 is not of type HTMLElement or HTMLElement[]:" + items.join(', ')); } super(...items); this.Buttons = items.filter((item) => item instanceof GiftArrayButton); } get frequency () { const activeButton = this.Buttons.find((item) => item.checked); if (activeButton.value === "recurs") return "monthly"; if (activeButton.value === "NO_RECURR") return "one-time"; return activeButton.value; } set frequency (newFrequency) { const reNewFrequencyValue = new RegExp(newFrequency, 'gmi'); const matchingButton = this.find((item) => item.value.match(reNewFrequencyValue) || item.text.match(reNewFrequencyValue)); matchingButton.click(); } get recurring () { return this.frequency === "monthly" ? true : false; } set recurring (bool) { this.frequency = bool === true ? "monthly" : "one-time"; } addEventListeners (eventType, callbackFunction, filter = undefined) { if (filter && typeof filter === 'function') { const filteredItems = this.filter((item) => filter.call(this, item)); filteredItems.forEach((item) => item.addEventListener(eventType, callbackFunction)); } else if (filter && typeof filter === 'string') { if (filter.match(/buttons/gmi)) this.Buttons.forEach((item) => item.addEventListener(eventType, callbackFunction)); if (filter.match(/other/gmi)) this.OtherAmountInput.addEventListener(eventType, callbackFunction); } else { this.forEach((item) => item.addEventListener(eventType, callbackFunction)); } } } // const lockedProperty = { writable: false, configurable: false, enumerable: true }; function DonationFormAPI (elements, options = {}) { const defaultOptions = { min: 1.00, max: 999999.99, makeTabbed: false, fakeSubmit: true, overrideGiftArrayValues: false, }; options = { ...defaultOptions, ...options }; // const { frequencyRadios, submitButton, root } = elements; const [ amountRadiosOnetime, amountRadiosMonthly ] = elements.amountRadios; const oneTimeOtherAmountWrapper = amountRadiosOnetime.find((div) => !div.matches('.webform-component-textfield') || div.querySelector('input[type="text"]')); const oneTimeRadioButtons = amountRadiosOnetime.filter((div) => div !== oneTimeOtherAmountWrapper); const monthlyOtherAmountWrapper = amountRadiosMonthly.find((div) => !div.matches('.webform-component-textfield') || div.querySelector('input[type="text"]')); const monthlyRadioButtons = amountRadiosMonthly.filter((div) => div !== monthlyOtherAmountWrapper); const debug = { log: (...args) => window.NA.DonationForm.DEBUG_MODE && console.log(...args), info: (...args) => window.NA.DonationForm.DEBUG_MODE && console.log(...args), warn: (...args) => window.NA.DonationForm.DEBUG_MODE && console.log(...args), error: (...args) => window.NA.DonationForm.DEBUG_MODE && console.log(...args), }; // const api = new Object(); Object.defineProperty(api, 'root', { value: root, writable: false, configurable: true, enumerable: true, }); Object.defineProperties(api, { 'FORM_MINIMUM': { value: options.min || 0, ...lockedProperty }, 'FORM_MAXIMUM': { value: options.max || Infinity, ...lockedProperty }, }); Object.defineProperties(api, { GiftArrays: { value: { "one-time": new GiftArray([ ...oneTimeRadioButtons, oneTimeOtherAmountWrapper ]), "monthly": new GiftArray([ ...monthlyRadioButtons, monthlyOtherAmountWrapper ]), }, writable: false, configurable: true, enumerable: true, }, Frequencies: { value: new FrequencyArray(frequencyRadios), writable: false, configurable: true, enumerable: true, }, SubmitButton: { value: submitButton, writable: false, configurable: false, enumerable: true, } }); Object.defineProperties(api, { 'getFrequency': { value: async function () { if (!this || this === null) throw new Error("validate: Unable to read API context."); return new Promise((resolve, reject) => { try { resolve(this.Frequencies.frequency); } catch (error) { reject(error); } }); }, ...lockedProperty }, 'setFrequency': { value: async function (frequency) { if (!this || this === null) throw new Error("validate: Unable to read API context."); return new Promise(async (resolve, reject) => { try { this.Frequencies.frequency = frequency; if (await this.getFrequency() === frequency) resolve(frequency); } catch (error) { reject(error); } }); }, ...lockedProperty }, 'getAmount': { value: async function (frequency = undefined) { if (!this || this === null) throw new Error("validate: Unable to read API context."); return new Promise(async (resolve, reject) => { try { frequency = frequency || await this.getFrequency(); if (frequency && this.GiftArrays.hasOwnProperty(frequency)) { const activeGiftArray = this.GiftArrays[frequency]; resolve(activeGiftArray.amount); } else { throw new Error("getAmount: Invalid frequency: " + frequency); } } catch (error) { reject(error); } }); }, ...lockedProperty }, 'setAmount': { value: async function (amount, frequency = undefined) { if (!this || this === null) throw new Error("validate: Unable to read API context."); return new Promise(async (resolve, reject) => { try { const currentFrequency = await this.getFrequency(); if (!frequency) { frequency = currentFrequency; } else if (frequency !== currentFrequency) { frequency = await this.setFrequency(frequency); } if (frequency && this.GiftArrays.hasOwnProperty(frequency)) { const activeGiftArray = this.GiftArrays[frequency]; activeGiftArray.amount = amount; } else { throw new Error("setAmount: Invalid frequency: " + frequency); } if (await this.getAmount() === amount) resolve(amount); } catch (error) { reject(error); } }); }, ...lockedProperty }, 'getRecurring': { value: async function () { if (!this || this === null) throw new Error("validate: Unable to read API context."); return new Promise((resolve, reject) => { try { resolve(this.Frequencies.recurring); } catch (error) { reject(error); } }); }, ...lockedProperty }, 'setRecurring': { value: async function (bool) { if (!this || this === null) throw new Error("validate: Unable to read API context."); return new Promise(async (resolve, reject) => { try { this.Frequencies.frequency = bool ? true : false; if (await this.getRecurring() === bool) resolve(bool); } catch (error) { reject(error); } }); }, ...lockedProperty }, freqency: { get () { return this.getFrequency() }, set (value) { this.setFrequency(value) }, enumerable: true, configurable: true, }, amount: { get () { return this.getAmount() }, set (value) { this.setAmount(value) }, enumerable: true, configurable: true, }, recurring: { get () { return this.getRecurring() }, set (value) { this.setRecurring(value) }, enumerable: true, configurable: true, }, }); Object.defineProperties(api, { 'submit': { value: async function (condition = this.validate||function(){return true}) { //this.hooks['onBeforeSubmit'].forEach((callback) => callback.call(this)); let result; const isAsyncFunction = (func) => func.constructor.name === "AsyncFunction"; if (Array.isArray(condition)) { if (condition.every((c) => typeof c === 'function' && isAsyncFunction(c))) { result = await Promise.all(condition.map(async (c) => await c.call(this))); } else if (condition.every((c) => typeof c === 'function')) { result = condition.every((c) => c.call(this)); } else if (condition.every((c) => c === true || c === false)) { result = condition.every((c) => c); } } else if (typeof condition === 'function' && isAsyncFunction(condition)) { result = await condition.call(this); } else if (typeof condition === 'function') { result = condition.call(this); } else if (condition === true || condition === false) { result = condition; } else { console.error("Unknown error."); debugger; } // if (result === true) { if (window.NA.DonationForm.hasOwnProperty("DEBUG_MODE") && window.NA.DonationForm["DEBUG_MODE"] == true) return console.log("Submit aborted (debug mode is enabled)."); this.SubmitButton.click(), this.hooks['onSubmit'].forEach((callback) => callback.call(this)); //this.hooks['onAfterSubmit'].forEach((callback) => callback.call(this)); } else { return console.log("Submit failed (conditions did not evaluate to true)."); } }, ...lockedProperty }, 'interceptSubmit': { value: function (handleInterceptedSubmit = () => { return new Promise((resolve) => resolve(undefined)) }) { try { window.NA.DonationForm.SubmitButtonCopy = window.NA.DonationForm.SubmitButtonCopy || createNewSubmitButton(window.NA.DonationForm.SubmitButton, { cloneOriginal: false, hideOriginal: true, observeOriginal: false }); window.NA.DonationForm.SubmitButtonCopy.addEventListener('click', async (event) => { event.preventDefault(), event.stopPropagation(); const shouldFormSubmit = await handleInterceptedSubmit.call(this, event); if (shouldFormSubmit) { console.info("Submit allowed by initial interceptSubmit callback function resulting in a truthy evaluation."); const formIsValid = await window.NA.DonationForm.validate(); if (!formIsValid) { // if submit allowed but there are known errors in the form console.warn("Form has known errors. Attempting to submit to show errors then retrying."); console.log("Submitting..."); window.NA.DonationForm.submit(true); // submit anyway to trigger the error to be shown window.NA.DonationForm.SubmitButton.style.setProperty("display", "none"), debug.info("SubmitButton hidden."), // hide the original submit button again window.NA.DonationForm.SubmitButtonCopy.style.setProperty("display", "none"), debug.info("SubmitButtonCopy hidden."); // hide the copy of the submit button again window.NA.DonationForm.SubmitButtonCopy.style.removeProperty("display"), debug.info("SubmitButtonCopy unhidden."); // show the copy of the submit button } else { console.log("Submitting..."); window.NA.DonationForm.submit(true); } } else { console.log("Submit prevented."); console.info("Next submit will be allowed."); window.NA.DonationForm.SubmitButton.style.removeProperty("display"), debug.info("SubmitButton unhidden."); // show the original submit button so that if something goes wrong the user can still click the submit button window.NA.DonationForm.SubmitButtonCopy.style.setProperty("display", "none"), debug.info("SubmitButtonCopy hidden."); // hide the copy of the submit button that intercepts submit attempts so that there aren't two buttons } }); console.log("Submit intercept added.\nButton:", window.NA.DonationForm.SubmitButtonCopy); } catch (error) { console.error("Failed to add submit intercept:", error); } }, ...lockedProperty }, 'validate': { value: async function (root = undefined) { if (!this || this === null) throw new Error("validate: Unable to read API context."); root = root || this.root; const flattenArray = (array) => array.reduce((flat, toFlatten) => flat.concat(Array.isArray(toFlatten) ? flattenArray(toFlatten) : toFlatten), []); try { const freqency = await this.getFrequency(), amount = await this.getAmount(); if (!freqency || !amount) return false; if (amount < this.FORM_MINIMUM || amount > this.FORM_MAXIMUM) return console.error("validate:", "Gift amount is invalid:", amount), false; let requiredFields = Array.from(root.querySelectorAll('label:has(.form-required)')) .map((label) => document.getElementById(label.htmlFor) || (label.nextElementSibling || label.previousElementSibling)) .filter((_) => !!_) // remove blanks .filter((field) => { if (field.name && field.name.includes('[payment_information]')) return false; return true; }) .map((field) => { if (field.matches("div")) return [...field.querySelectorAll('input')]; return field; }) requiredFields = flattenArray(requiredFields); const valid = requiredFields.every((input) => { const type = input.tagName.toLowerCase() === 'select' ? 'select' : input.type; const { name, value, id } = input; //console.log(type, name, value); if (name === 'submitted[payment_information][payment_fields][credit][card_number]') { if (value && value.length === 16) return true; return console.error("validate:", name+':', "CC is invalid."), false; } if (name === 'submitted[leadership_circle]') return true; if (name === 'submitted[donation][other_amount]' || name === 'submitted[donation][recurring_other_amount]') if (amount) return true; switch (type) { case 'email': const emailRegex = /^[a-zA-Z0-9._%+-]+@[a-zA-Z0-9.-]+\.[a-zA-Z]{2,}$/; if (!emailRegex.test(value)) return console.error("validate:", name+':', "Email address is invalid.\n", input, value), false; return true; case 'tel': if (!value || value.length < 10) return console.error("validate:", name+':', "Phone number is invalid.\n", input, value), false; return true; case 'select': case 'radio': case 'text': if (!value || value.length === 0) return console.error("validate:", name+':', "Field is invalid.\n", input, value), false; return true; default: debug.log("default"); return true; } /*if (!value || value.length === 0) return false;*/ }); return valid; } catch (error) { console.error(error); return false; } }, ...lockedProperty }, //'makeTabbed': { value: function(){} }, 'DonationInterrupter': { value: { init: initDonationInterrupter.bind(api) }, enumerable: true, configurable: true, writable: true, } }); initHooks(api, ['onFrequencyChange', 'onAmountChange', 'onTrySubmit', 'onSubmit']); api.Frequencies.addEventListeners('change', (event) => { if (event.target.checked) { api.hooks['onFrequencyChange'].forEach((callback) => { callback.call(api, event.target.value); }); } }); Object.entries(api.GiftArrays).forEach(([ key, GiftArray ]) => { GiftArray.addEventListeners('change', (event) => { if (event.target.checked) { api.hooks['onAmountChange'].forEach((callback) => { callback.call(api, event.target.value); }); } }); }); api.SubmitButton.addEventListener('click', (event) => { api.hooks['onTrySubmit'].forEach((callback) => callback.call(api, event)); }); api.root.addEventListener('submit', (event) => { api.hooks['onSubmit'].forEach((callback) => callback.call(api, event)); }); if (options.makeTabbed) api.makeTabbed(); /*if (options.fakeSubmit) window.NA.DonationForm.SubmitButtonCopy = window.NA.DonationForm.SubmitButtonCopy || createNewSubmitButton(window.NA.DonationForm.SubmitButton, { cloneOriginal: false, hideOriginal: true, observeOriginal: false });*/ return api; } function createNewSubmitButton (originalSubmitButton = window.NA.DonationForm.SubmitButton, options = {}) { const defaultOptions = { cloneOriginal: true, hideOriginal: true, observeOriginal: true, }; options = { ...defaultOptions, ...options }; const newSubmitButton = document.createElement('button'); //newSubmitButton.id = "submit-button-copy"; newSubmitButton.classList.add("btn"); newSubmitButton.textContent = originalSubmitButton.value; originalSubmitButton.after(newSubmitButton); options.hideOriginal && originalSubmitButton.style.setProperty("display", "none"); return newSubmitButton; } function initHooks (api, hookNames = []) { const hooks = Object.fromEntries(hookNames.map((hookName) => ([hookName, new Array()]))); Object.defineProperty(api, 'hooks', { value: hooks, ...lockedProperty }); } function initDonationInterrupter (options = {}) { const getExpId = () => { let experiments = window._vwo_exp; experiments = Object.entries(window._vwo_exp); let id = experiments.find(([id, data]) => { const name = data.name; return name.match(/Donation Interrupter/); })[1]?.id; return id; }; const getExpVariation = (id) => { let experiment = window._vwo_exp[id]; return experiment.combination_chosen || experiment.combination_selected; }; const defaultOptions = { id: [ 'VWO', getExpId(), getExpVariation(getExpId()) ].join('-'), tokenName: ("NA__MPR_DonationInterrupter:" + [ 'VWO', getExpId(), getExpVariation(getExpId()) ].join('-')), min: 10, max: 100, askAmount: (originalAmount) => { if (originalAmount > 500) // $500+ return false; // don't show if (originalAmount >= 400) // $400-$500 return 50; if (originalAmount >= 300) // $300-$399 return 40; if (originalAmount >= 200) // $200-$299 return 30; if (originalAmount >= 100) // $100-$199 return 15; if (originalAmount < 100) // $100- return 10; return false; }, askFrequency: (originalFrequency) => { return "monthly"; }, popupHTML: { headingHTML: (` `), bodyHTML: (` `), }, }; options = { ...defaultOptions, ...options }; console.log("Initializing donation interrupter."); return new Promise((resolve, reject) => { try { const dialogElement = document.createElement('dialog'); dialogElement.id = options.id; dialogElement.classList.add("popup", "donation-interrupter", "NA"); dialogElement.innerHTML = `
${options.popupHTML.headingHTML} ${options.popupHTML.bodyHTML}
`; document.body.appendChild(dialogElement); // // const api = new Object({ askAmount: options.askAmount, askFrequency: options.askFrequency, }); Object.defineProperties(api, { id: { value: options.id, writable: false, enumerable: true, configurable: false, }, tokenName: { value: options.tokenName, writable: false, enumerable: true, configurable: false, }, Dialog: { value: dialogElement, writable: false, enumerable: true, configurable: true, }, show: { value: function () { this.update(), this.Dialog.showModal(), vwoCustomEvent(`${this.id}:shown`); this.storedState.updateTokenProperty("lastShown", getCurrentDate()); this.hooks['onShow'].forEach((callback) => callback.call(this)); }, ...lockedProperty }, hide: { value: function () { this.Dialog.close(), this.hooks['onHide'].forEach((callback) => callback.call(this)); }, ...lockedProperty }, update: { value: function () { this.Dialog.dispatchEvent(new CustomEvent('update'), { bubbles: false }); }, ...lockedProperty } }); Object.defineProperty(api, 'storedState', { value: { storageApi: localStorage, getToken: (function () { const tokenName = this.tokenName, storageApi = this.storedState.storageApi; return JSON.parse(storageApi.getItem(tokenName)) || null; }).bind(api), setToken: (function (tokenValue) { const tokenName = this.tokenName, storageApi = this.storedState.storageApi; return storageApi.setItem(tokenName, JSON.stringify(tokenValue)); }).bind(api), updateTokenProperty: (function (tokenPropertyName, tokenPropertyValue) { let state = this.storedState.getToken() || {}; state[tokenPropertyName] = tokenPropertyValue; this.storedState.setToken(state); return (this.storedState.getToken() || {})[tokenPropertyName] || undefined; }).bind(api), } }); initHooks(api, ['onShow', 'onHide', 'onUpdate', 'onYes', 'onNo']); function handleDialogUpdate (event) { // update dynamic text in the dialog Array.from(this.Dialog.querySelectorAll('[data-value]')).forEach(async (el) => { const attributeValue = el.getAttribute('data-value'); const currentAmount = await window.NA.DonationForm.getAmount(), currentFrequency = await window.NA.DonationForm.getFrequency(); if (attributeValue.match("askAmount")) { el.textContent = this.askAmount(currentAmount); } else if (attributeValue.match("askFrequency")) { el.textContent = this.askFrequency(currentFrequency); } else if (attributeValue.match("originalAmount") || attributeValue.match("amount")) { el.textContent = currentAmount; } else if (attributeValue.match("originalFrequency") || attributeValue.match("frequency")) { el.textContent = currentFrequency; } }); this.hooks['onUpdate'].forEach((callback) => callback.call(this)); } api.Dialog.addEventListener('update', handleDialogUpdate.bind(api)); // const handleYes = (async function () { vwoCustomEvent(`${this.id}:DonationInterrupter:yes`); const currentAmount = await window.NA.DonationForm.getAmount(), currentFrequency = await window.NA.DonationForm.getFrequency(); const catchAsyncError = (error) => { console.error("An error occured:", error); debugger; this.hide(); }; window.NA.DonationForm.setFrequency(this.askFrequency(currentFrequency)).then((frequency) => { console.log("Updated frequency:", frequency); window.NA.DonationForm.setAmount(this.askAmount(currentAmount)).then((amount) => { console.log("Updated amount:", amount); 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const currentFrequency = await window.NA.DonationForm.getFrequency(), currentAmount = await window.NA.DonationForm.getAmount(), askFrequency = this.askFrequency(currentFrequency), askAmount = this.askAmount(currentAmount); if (!currentFrequency || askFrequency == currentFrequency) return console.log("Ask frequency returned false or invalid; donation interrupter will not be shown."), shouldNotShow(); if (askAmount == false || askAmount <= 0) return console.log("Ask amount returned false or invalid; donation interrupter will not be shown."), shouldNotShow(); } catch (error) { return console.error(error), shouldNotShow(); } try { /// Summary: shows when not seen before at all, or if seen and dismissed on a day that is not the current day (e.g. yesterday) const storedState = this.storedState.getToken(); if (!storedState || !storedState.hasOwnProperty("lastShown")) { // has not been seen before; first time return console.log("Donation interrupter not seen yet; donation interrupter will be shown."), shouldShow(); 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Understanding bears could help us survive heart attacks, researchers say

Preparing to implant monitor
Dr. Tim Laske, center, and Dr. Paul Iaizzo, right, prepared to implant a cardiac monitor in a female black bear on Tuesday, March 8, 2011, in northwest Minnesota. The monitor will record the bear's heart rate and overall activity for the next three years.
MPR Photo/Ann Arbor Miller

University of Minnesota researchers think lessons learned from hibernating black bears will help save human lives in a unique study that could someday improve the odds of surviving a heart attack.

Despite starving for four to six months, a bear's heart and other muscles remain strong and healthy, said Paul Iaizzo, a University of Minnesota professor who has studied hibernating bears for a dozen years. He is convinced that putting critically ill patients in the same sort of state of hibernation could save lives.

"You're trying to protect the vital organs and the loss of skeletal muscle," Iaizzo said. "And that's exactly what the bear will do here at the den. So they could be the ideal model for that [intensive care unit] patient."

Black bears are amazing physical specimens. They crawl into a hole in the ground in late fall. They don't eat or drink anything for four to six months. Then they climb out in the spring strong and healthy.

"We think there's a lot or really important clinical things we might learn that could apply to human medicine," Iaizzo said.

Earlier this spring, Iaizzo was in the northern Minnesota woods with other researchers gathering data on hibernating bears. He watched as Tim Laske, vice president for product development at the Medtronic medical devices company, set up portable imaging gear to look at the bear's heart.

Laske also downloaded data from a heart monitor inserted under the bear's skin months earlier. It showed how her heart changed as hibernation began.

"Her heart is slowed down, which is very typical for bears," Laske said. "We'll see the heart stop for 14 seconds at a time. If one of our hearts were to stop for even three seconds, you would faint."

During hibernation, a bear's heartbeat drops to five to 10 beats a minute. The heart rate speeds up to about 60 beats per minute when the bear takes a breath, then slows down again.

This data is unique because it tracks the bear's heart rate in its natural state. The data shows the bear's heart rate changes any time humans are nearby. So doing this research in a lab would likely mean inaccurate data.

Iaizzo recently performed open heart surgery on a pig at the University of Minnesota Visible Heart Lab in Minneapolis. Animals like it are used to test the effects of what Iaizzo calls hibernation factors.

In the lab
As part of his research, Dr. Paul Iaizzo applies Omega 3 compounds to the heart of a pig at the University of Minnesota in Minneapolis on May 19, 2011. Iaizzo's preliminary work shows that the chemicals that control hibernation in bears could significantly reduce heart attack damage in humans.
MPR Photo/Nikki Tundel

Researchers don't understand all of what's happening in a bear's body during hibernation, but Iaizzo said they are focused on hibernation induction triggers. One of those triggers is an opioid called delta opioid agonist, which seems to allow muscles to live with lower oxygen levels. The hibernation induction triggers circulating in a hibernating bear's blood are thought to protect its heart and other muscles during hibernation.

"We'll actually cause an infarct, or induce a heart attack," explained Iaizzo.

An infarct is the area of heart muscle that dies when it's starved of oxygen during a heart attack. Iaizzo wants to know what happens when pig hearts are treated with bear hormones before a heart attack.

"What we saw is they reduced the infarct size by 50 percent, which is really dramatic," he said. "We're looking at if you can induce the heart attack, then give the agents and see if you can minimize the damage. And this looks promising."

Those same hibernation agents could be used to protect the health of donor hearts during a heart transplant, Iaizzo said, improving the odds of success.

Iaizzo is also investigating how bears keep their muscle tone while lying around for four to six months during hibernation.

Paul Iaizzo
Dr. Paul Iaizzo instructs nursing students in a University of Minnesota lab in Minneapolis on May 19, 2011.
MPR Photo/Nikki Tundel

"Now if you or I were to sit around on a couch for a month and not do anything, we would lose up to 30 to 40 percent of our muscle mass."

That's just what happens to critically ill patients in hospitals. Iaizzo said sometimes they lose so much muscle mass they can no longer breathe on their own and need to be put on a ventilator. That muscle loss can also lead to organ damage.

"And this is a huge health care burden and cost," he said. "And we think some of what we're learning from these black bears could be applied in these clinical situations."

Iaizzo said the black bear still holds some medical mysteries. Researchers don't fully understand how its body stays so healthy during hibernation.

But he's confident what's been learned so far will lead to big improvements in medical care within the next 10 years.

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