");vwo_$('head').append(_vwo_sel);return vwo_$('head')[0] && vwo_$('head')[0].lastChild;})("HEAD")}}, C_940895_61_1_2_6:{ fn:function(log,nonce=''){return (function(x) {var el,ctx=vwo_$(x); /*vwo_debug log("editElement","#tfa_118-L > b:nth-of-type(1)"); vwo_debug*/(el=vwo_$("#tfa_118-L > b:nth-of-type(1)")).html("7. What is your overall impression of the quality of MPR's programs and offering?");})("#tfa_118-L > b:nth-of-type(1)")}}, C_940895_48_1_2_1:{ fn:function(log,nonce=''){return (function(x) {var el,ctx=vwo_$(x); /*vwo_debug log("editElement",".stylingblock-content-margin-cell > table:nth-of-type(1) > tbody:nth-of-type(1) > tr:nth-of-type(1) > td:nth-of-type(1) > div:nth-of-type(1) > div:nth-of-type(1) > h2:nth-of-type(1) > span:nth-of-type(1)"); vwo_debug*/(el=vwo_$(".stylingblock-content-margin-cell > table:nth-of-type(1) > tbody:nth-of-type(1) > tr:nth-of-type(1) > td:nth-of-type(1) > div:nth-of-type(1) > div:nth-of-type(1) > h2:nth-of-type(1) > span:nth-of-type(1)")).html("Hello! David Brancaccio here. Do you want instant access to the free online course - “Economics 101” - to understand basic economic concepts?");})(".stylingblock-content-margin-cell > table:nth-of-type(1) > tbody:nth-of-type(1) > tr:nth-of-type(1) > td:nth-of-type(1) > div:nth-of-type(1) > div:nth-of-type(1) > h2:nth-of-type(1) > span:nth-of-type(1)")}}, R_940895_48_1_2_1:{ fn:function(log,nonce=''){return (function(x) { if(!vwo_$.fn.vwoRevertHtml){ return; }; var el,ctx=vwo_$(x); /*vwo_debug log("Revert","editElement",".stylingblock-content-margin-cell > table:nth-of-type(1) > tbody:nth-of-type(1) > tr:nth-of-type(1) > td:nth-of-type(1) > div:nth-of-type(1) > div:nth-of-type(1) > h2:nth-of-type(1) > span:nth-of-type(1)"); vwo_debug*/(el=vwo_$(".stylingblock-content-margin-cell > table:nth-of-type(1) > tbody:nth-of-type(1) > tr:nth-of-type(1) > td:nth-of-type(1) > div:nth-of-type(1) > div:nth-of-type(1) > h2:nth-of-type(1) > span:nth-of-type(1)")).vwoRevertHtml();})(".stylingblock-content-margin-cell > table:nth-of-type(1) > tbody:nth-of-type(1) > tr:nth-of-type(1) > td:nth-of-type(1) > div:nth-of-type(1) > div:nth-of-type(1) > h2:nth-of-type(1) > span:nth-of-type(1)")}}, C_940895_48_1_2_2:{ fn:function(log,nonce=''){return (function(x) {var el,ctx=vwo_$(x); /*vwo_debug log("content","[vwo-element-id='1742482566780']"); vwo_debug*/(el=vwo_$("[vwo-element-id='1742482566780']")).replaceWith2("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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"),el=vwo_$("[vwo-element-id='1742482566780']");})("[vwo-element-id='1742482566780']")}}, R_940895_48_1_2_2:{ fn:function(log,nonce=''){return (function(x) { if(!vwo_$.fn.vwoRevertHtml){ return; }; var el,ctx=vwo_$(x); /*vwo_debug log("Revert","content","[vwo-element-id='1742482566780']"); vwo_debug*/(el=vwo_$("[vwo-element-id='1742482566780']")).revertContentOp(),el=vwo_$("[vwo-element-id='1742482566780']");})("[vwo-element-id='1742482566780']")}}, C_940895_48_1_2_3:{ fn:function(log,nonce=''){return (function(x) {var el,ctx=vwo_$(x); /*vwo_debug log("content",".stylingblock-content-margin-cell > table:nth-of-type(1) > tbody:nth-of-type(1) > tr:nth-of-type(1) > td:nth-of-type(1) > div:nth-of-type(1) > div:nth-of-type(1) > div:nth-of-type(1)"); vwo_debug*/(el=vwo_$(".stylingblock-content-margin-cell > table:nth-of-type(1) > tbody:nth-of-type(1) > tr:nth-of-type(1) > td:nth-of-type(1) > div:nth-of-type(1) > div:nth-of-type(1) > div:nth-of-type(1)")).replaceWith2("
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.

Whether you're new to economics or just want to deepen your understanding, this course covers the basics and connects them to today’s pressing issues—from inequality to public policy decisions.

Each week, you'll receive a reading guide that distills core principles, offers actionable takeaways, and explains how they affect the current world. While the full ebook enriches the experience, the guides alone provide a comprehensive understanding of fundamental economic ideas.

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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(`${this.id}:DonationInterrupter:yes`); const currentAmount = await window.NA.DonationForm.getAmount(), currentFrequency = await window.NA.DonationForm.getFrequency(); const catchAsyncError = (error) => { console.error("An error occured:", error); debugger; this.hide(); }; window.NA.DonationForm.setFrequency(this.askFrequency(currentFrequency)).then((frequency) => { console.log("Updated frequency:", frequency); window.NA.DonationForm.setAmount(this.askAmount(currentAmount)).then((amount) => { console.log("Updated amount:", amount); setTimeout(() => { console.log("Submitting..."); try { window.NA.DonationForm.submit(); } catch (error) { console.error("Error when submitting."); } finally { this.hide(); } }, 100); }).catch(catchAsyncError); }).catch(catchAsyncError); this.storedState.updateTokenProperty("lastConverted", getCurrentDate()); }).bind(api); const handleNo = (function () { vwoCustomEvent(`${this.id}:DonationInterrupter:no`); setTimeout(() => { console.log("Submitting..."); try { window.NA.DonationForm.submit(); } catch (error) { console.error("Error when submitting."); } finally { this.hide(); } }, 100); this.storedState.updateTokenProperty("lastDismissed", getCurrentDate()); }).bind(api); const handleCancel = (function () { this.hide(); this.storedState.updateTokenProperty("lastDismissed", getCurrentDate()); }).bind(api); async function handleDialogButtonClick (event) { event.preventDefault(); if (event.target.hasAttribute('data-action')) { if (event.target.getAttribute('data-action').match("yes")) { await handleYes.call(this); this.hooks['onYes'].forEach((callback) => callback.call(this)); } if (event.target.getAttribute('data-action').match("no")) { await handleNo.call(this); this.hooks['onNo'].forEach((callback) => callback.call(this)); } } } Array.from(api.Dialog.querySelectorAll('.popup__footer button')).forEach((button) => button.addEventListener('click', handleDialogButtonClick.bind(api))); if (api.Dialog.querySelector('.btn-dismiss')) api.Dialog.querySelector('.btn-dismiss').onclick = handleCancel; window.NA.DonationForm.DonationInterrupter = api; async function shouldDonationInterrupterShow () { return new Promise(async (resolve, reject) => { const shouldSubmit = true, shouldNotSubmit = false; const shouldShow = () => { this.show(), resolve(shouldNotSubmit) }, shouldNotShow = () => resolve(shouldSubmit); try { const formIsValid = await window.NA.DonationForm.validate(); if (!formIsValid) return console.log("One or more donation form fields are invalid; donation interrupter will not be shown."), shouldNotShow(); 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(); } else { // returning visitors if (storedState.hasOwnProperty("lastConverted")) { // the user has converted from the popup before return console.log("Already converted; donation interrupter will not be shown."), shouldNotShow(); } else if (storedState.hasOwnProperty("lastDismissed") && storedState['lastDismissed'] !== getCurrentDate()) { // if the popup has been dismissed before but the last time it was dismissed is NOT today return console.log("Donation interrupter dismissed, but not today; donation interrupter will be shown."), shouldShow(); } else { return console.log("Donation interrupter already seen and/or dismissed today; donation interrupter will not be shown."), shouldNotShow(); } } } catch (error) { return console.error(error), shouldNotShow(); } }); } window.NA.DonationForm.interceptSubmit(shouldDonationInterrupterShow.bind(api)); resolve(api); } catch (error) { console.error(error); } }); } window.NA = window.NA || {}; window.NA.DonationForm = window.NA.DonationForm || {}; window.NA.DonationForm.init = async function init () { console.log("Initializing donation form API. Waiting for required elements...."); return new Promise((resolve, reject) => { const asyncWaitForElement=async function(e,r=100,t=1e4){r=Number.isInteger(r)&&r>0&&r<=100?r:parseInt(r);let n="Array";if("NaN"==r)return console.error("Invalid refresh interval:",r);Array.isArray(e)||"string"!=typeof e||(n="string",e=[e]);let l=e=>document.querySelector(e),i=e=>e.every(e=>!!l(e));return new Promise((R,a)=>{let m=(e,r=null)=>(r&&clearInterval(r),R("Array"==n||e.length>1?e.map(e=>l(e)):l(e[0]))),o=n=>{console.error(`${n.name}: ${n.message}`);let l=()=>asyncWaitForElement(e,r=100,t=1e4);return a(n,l)};try{if(i(e))return m(e);let s=setInterval(()=>{if(i(e))return m(e,s)},1e3/r);setTimeout(()=>{try{if(!i(e)){clearInterval(s);let r=Error(`Failed to find matching elements within ${t}ms`);throw r.name="Timed Out",r}}catch(n){return o(n)}},t)}catch(u){return o(u)}})}; asyncWaitForElement([ 'form.webform-client-form', '#webform-component-donation--recurs-monthly', '#webform-component-donation--amount', '#webform-component-donation--recurring-amount', '.form-actions input[type="submit"]' ]).then(([ componentDonationForm, componentFrequency, componentAmountOnetime, componentAmountMonthly, formSubmitButton ]) => { const api = DonationFormAPI({ root: componentDonationForm, frequencyRadios: [...componentFrequency.querySelectorAll('.form-type-radio')], amountRadios: [ [...componentAmountOnetime.querySelectorAll('div > .form-type-radio, div > .webform-component-textfield')], [...componentAmountMonthly.querySelectorAll('div > .form-type-radio, div > .webform-component-textfield')], ], submitButton: formSubmitButton, // }); window.NA.DonationForm = { ...window.NA.DonationForm, ...api }; resolve(window.NA.DonationForm); }).catch((error) => reject(error)); }); }; }catch(e) {console.error(e)} return vwo_$('head')[0] && vwo_$('head')[0].lastChild;})("head")}}, R_940895_61_1_2_8:{ fn:function(log,nonce=''){return (function(x) { if(!vwo_$.fn.vwoRevertHtml){ return; }; var el,ctx=vwo_$(x); /*vwo_debug log("Revert","editElement","#tfa_130-L > b:nth-of-type(1)"); vwo_debug*/(el=vwo_$("#tfa_130-L > b:nth-of-type(1)")).vwoRevertHtml();})("#tfa_130-L > b:nth-of-type(1)")}}, C_940895_61_1_2_8:{ fn:function(log,nonce=''){return (function(x) {var el,ctx=vwo_$(x); /*vwo_debug log("editElement","#tfa_130-L > b:nth-of-type(1)"); vwo_debug*/(el=vwo_$("#tfa_130-L > b:nth-of-type(1)")).html("9. Do you believe that MPR is an important community resource?");})("#tfa_130-L > b:nth-of-type(1)")}}, R_940895_48_1_2_0:{ fn:function(log,nonce=''){return (function(x) { if(!vwo_$.fn.vwoRevertHtml){ return; }; var ctx=vwo_$(x),el; /*vwo_debug log("Revert","content",""); vwo_debug*/; el=vwo_$('[vwo-element-id="1742919897117"]'); el.revertContentOp().remove();})("HEAD")}}, C_940895_62_1_3_1:{ fn:function(log,nonce=''){return (function(x) {var el,ctx=vwo_$(x); /*vwo_debug log("editElement","STRONG:tm('Success! You’re subscribed!')"); vwo_debug*/(el=vwo_$("STRONG:tm('Success! You’re subscribed!')")).vwoCss({"font-size":"22px !important"}),(el=vwo_$("STRONG:tm('Success! You’re subscribed!')")).vwoCss({"font-size":"24px !important"}),(el=vwo_$(".vwo_tm_1742501918554 STRONG:tm('Success! You’re subscribed!')")).html("You are now subscribed to the Weeknight Kitchen newsletter! 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Which topics or issues are you most interested in hearing about on MPR?");})("#tfa_102-L > b:nth-of-type(1)")}}, R_940895_61_1_2_7:{ fn:function(log,nonce=''){return (function(x) { if(!vwo_$.fn.vwoRevertHtml){ return; }; var el,ctx=vwo_$(x); /*vwo_debug log("Revert","editElement","#tfa_124-L > b:nth-of-type(1)"); vwo_debug*/(el=vwo_$("#tfa_124-L > b:nth-of-type(1)")).vwoRevertHtml();})("#tfa_124-L > b:nth-of-type(1)")}}, R_940895_61_1_2_9:{ fn:function(log,nonce=''){return (function(x) { if(!vwo_$.fn.vwoRevertHtml){ return; }; var el,ctx=vwo_$(x); /*vwo_debug log("Revert","editElement","#tfa_134-L > b:nth-of-type(1)"); vwo_debug*/(el=vwo_$("#tfa_134-L > b:nth-of-type(1)")).vwoRevertHtml();})("#tfa_134-L > b:nth-of-type(1)")}}, R_940895_62_1_2_0:{ fn:function(log,nonce=''){return (function(x) { if(!vwo_$.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_$("H1:tm('Support The Splendid Table Today')")).vwoRevertCss();})("H1:tm('Support The Splendid Table Today')")}}, C_940895_61_1_2_7:{ fn:function(log,nonce=''){return (function(x) {var el,ctx=vwo_$(x); /*vwo_debug log("editElement","#tfa_124-L > b:nth-of-type(1)"); vwo_debug*/(el=vwo_$("#tfa_124-L > b:nth-of-type(1)")).html("8. 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Six months after collapse, 35W bridge rebuild is ahead of schedule

There are more than 200 construction workers at the site next to the Mississippi River in Minneapolis where the old bridge collapsed and where the new one is being built.

The first plan was to cast the individual concrete bridge segments down-river and use barges to haul them to the site. That changed when engineers realized there's room on the currently closed freeway roadbed next to the river for the casting sheds.

Reinforcement
Bridge project manager Peter Sanderson says the reinforcing steel bar, or rebar, is laid out in a grid designed specifically for the bridge to attain maximum strength. It will be covered with concrete tested to meet special requirements, including corrosion resistance.
MPR Photo/Dan Olson

The four-story-tall metal casting sheds are where workers are building the plywood and reinforcing steel bar forms for the bridge segments. Outside the air temperature is barely above zero. Inside the sheds it's well above freezing with the aid of warm air pumped in by portable heaters thrumming in the background.

Concrete is a major component of the new bridge. More will be poured for the new span than was used to build the nearby Metrodome.

Engineer Peter Sanderson says concrete needs temperatures above freezing to cure properly. Along with temperature the concrete recipe, Sanderson says, has to be just right.

"The first five trucks we had to reject. They were too low in air content," he says.

Reinforced trusses
The bridge truss rebars are placed once the form is built. After the concrete is poured and cures, the entire bridge truss will be lifted into place by a huge crane.
MPR Photo/Dan Olson

The air entrainment, Sanderson calls it, wards off damage to concrete from freeze and thaw cycles - a problem here in Minnesota where annual temperatures vary widely.

"There are little tiny bubbles of air throughout the concrete that help insulate the concrete itself, it certainly gives you more durable concrete," he says.

Along with concrete the other major building material in the bridge is steel - 17 million pounds of green coated steel reinforcing rods. The concrete is poured around the rods inside the plywood form. The rods create a three dimensional maze. Together the concrete and steel form the strength of the bridge. There's nothing haphazard about the bending and placing of the steel rods or rebar in the individual bridge segments, Sanderson says.

"There's an exact spacing, size spacing, both ways of each particular size bar we're looking at. This is what carries the load, this is what will be carrying the new freeway," Sanderson says.

Casting sheds
Casting sheds are lined up on the I-35W roadbed on the west bank of the Mississippi River, with the freeway entrace ramp in the foreground.
MPR Photo/Dan Olson

The concrete recipe includes chemical additives to retard the corrosion of the steel rods, Sanderson says. Lots of salt is used on Minnesota's roads and bridges to melt ice and snow. That's good for safety, but bad for bridges as the salt seeps into concrete and corrodes the steel inside.

"It's extremely important to make sure the reinforcing steel isn't attacked by salts," he says.

Corrosion of steel trusses in the collapsed bridge, the speculation goes, may have weakened it hastening its failure. The new freeway bridge when complete will be 10 lanes wide with room and strength for light rail.

Its life expectancy is 100 years.

Project manager
Chief project engineer Peter Sanderson is overseeing the construction of the new 35W bridge in Minneapolis. He stands inside a casting shed, which rests on scaffolding next to the form being built for the first bridge truss.
MPR Photo/Dan Olson

Unlike the bridge that collapsed the new span has redundancies which prevent a total failure, and the span can be repaired.

"The main load carrying members here, if there are failures it doesn't mean the entire bridge will collapse," Sanderson says. "The running surface can be ground off and replaced. If there are other problems there is provision for further post-tensioning which will help strengthen the bridge."

Post-tensioning works this way.

The new bridge will have 120 cast concrete and steel segments. The segments resemble in shape and size upside down A-frame houses, except that each one weighs up to 200 tons.

Bridge workers
There are 200 carpenters and other specialized bridge builders on site. They are moving steel reinforcing members into place to support the plywood panels that will shape the concrete bridge truss. Flatiron Mason officials say they're adding 20 workers a day -- many from Minnesota -- to build the workforce to 600 by May, in order to stay on schedule.
MPR Photo/Dan Olson

The top of each segment is a piece of the freeway deck, what vehicles drive on. Once the segments are poured and cured, they are skidded along the freeway roadbed, lifted by a crane and set in place end to end.

Then, like a multi-strand necklace of pearls, the 120 segments are strung together by 16 massive steel tendons. The tendons contain 27 strands of steel. Each strand has seven wires.

When all the segments are in place and the tendons are strung inside a jack is used to pull the tendons taut. The tendons are held in place by huge anchor blocks with wedges that prevent them from slipping back. The post-tensioning counteracts sagging and adds strength to the span. Thus the name of this particular kind of a bridge, Sanderson says.

"A pre-cast post tension concrete box girder bridge."

Peter Sanderson works for Flatiron Manson, the consortium that won the $234 million contract to build the new span.

He says a bit more than 30 percent of the bridge building work has been completed in 30 percent of the time allotted for the project - 437 days.

The bridge is scheduled to open December 24th.

"We're actually slightly ahead of schedule and we're happy with where we stand," he says.

Sanderson says a more normal construction period for a large project like the 1232 foot-long 35W span is two years or more. He says the bridge building activity reaches a peak this spring. As many as 30 workers a week, many from Minnesota, are being hired for the project. There'll be about 600 hundred on site working two shifts, seven days a week when warm weather returns.

Peter Sanderson helped build a bridge in Mumbai, India before this project. The weather consideration there wasn't cold, but humidity from the monsoon season. He says he's lost track of the number of bridges he's helped build but estimates its more than three dozen.

Every Saturday at 11 a.m. people can walk with Sanderson near the 35W bridge project as he explains what's going on. For many it's a once in a lifetime opportunity to hear from one of the world's most experienced engineers how a bridge is built.

Dear reader,

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