Access this chapter
')
var buybox = document.querySelector("[data-id=id_"+ timestamp +"]").parentNode
var buyingOptions = buybox.querySelectorAll(".buying-option")
;[].slice.call(buyingOptions).forEach(initCollapsibles)
// springerPlus roll out starts here
if (window.localStorage) {
window.localStorage.removeItem("springerPlusRollOut")
}
//springerPlus ends here
var buyboxMaxSingleColumnWidth = 480
function initCollapsibles(subscription, index) {
var toggle = subscription.querySelector(".buying-option-price")
subscription.classList.remove("expanded")
var form = subscription.querySelector(".buying-option-form")
var priceInfo = subscription.querySelector(".price-info")
var buyingOption = toggle.parentElement
if (toggle && form && priceInfo) {
toggle.setAttribute("role", "button")
toggle.setAttribute("tabindex", "0")
toggle.addEventListener("click", function (event) {
var expandedBuyingOptions = buybox.querySelectorAll(".buying-option.expanded")
var buyboxWidth = buybox.offsetWidth
;[].slice.call(expandedBuyingOptions).forEach(function(option) {
if (buyboxWidth <= buyboxMaxSingleColumnWidth && option != buyingOption) {
hideBuyingOption(option)
}
})
var expanded = toggle.getAttribute("aria-expanded") === "true" || false
toggle.setAttribute("aria-expanded", !expanded)
form.hidden = expanded
if (!expanded) {
buyingOption.classList.add("expanded")
} else {
buyingOption.classList.remove("expanded")
}
priceInfo.hidden = expanded
}, false)
}
}
function hideBuyingOption(buyingOption) {
var toggle = buyingOption.querySelector(".buying-option-price")
var form = buyingOption.querySelector(".buying-option-form")
var priceInfo = buyingOption.querySelector(".price-info")
toggle.setAttribute("aria-expanded", false)
form.hidden = true
buyingOption.classList.remove("expanded")
priceInfo.hidden = true
}
function initKeyControls() {
document.addEventListener("keydown", function (event) {
if (document.activeElement.classList.contains("buying-option-price") && (event.code === "Space" || event.code === "Enter")) {
if (document.activeElement) {
event.preventDefault()
document.activeElement.click()
}
}
}, false)
}
function initialStateOpen() {
var buyboxWidth = buybox.offsetWidth
;[].slice.call(buybox.querySelectorAll(".buying-option")).forEach(function (option, index) {
var toggle = option.querySelector(".buying-option-price")
var form = option.querySelector(".buying-option-form")
var priceInfo = option.querySelector(".price-info")
if (buyboxWidth > buyboxMaxSingleColumnWidth) {
toggle.click()
} else {
if (index === 0) {
toggle.click()
} else {
toggle.setAttribute("aria-expanded", "false")
form.hidden = "hidden"
priceInfo.hidden = "hidden"
}
}
})
}
initialStateOpen()
if (window.buyboxInitialised) return
window.buyboxInitialised = true
initKeyControls()
})()
