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// http://stackoverflow.com/a/34003331
if (Element.prototype.scrollIntoView && !Element.prototype.scrollIntoViewIfNeeded) {
Element.prototype.scrollIntoViewIfNeeded = function (centerIfNeeded) {
function withinBounds(value, min, max, extent) {
if (false === centerIfNeeded || max <= value + extent && value <= min + extent) {
return Math.min(max, Math.max(min, value));
} else {
return (min + max) / 2;
}
}
function makeArea(left, top, width, height) {
return { "left": left, "top": top, "width": width, "height": height
, "right": left + width, "bottom": top + height
, "translate":
function (x, y) {
return makeArea(x + left, y + top, width, height);
}
, "relativeFromTo":
function (lhs, rhs) {
var newLeft = left, newTop = top;
lhs = lhs.offsetParent;
rhs = rhs.offsetParent;
if (lhs === rhs) {
return area;
}
for (; lhs; lhs = lhs.offsetParent) {
newLeft += lhs.offsetLeft + lhs.clientLeft;
newTop += lhs.offsetTop + lhs.clientTop;
}
for (; rhs; rhs = rhs.offsetParent) {
newLeft -= rhs.offsetLeft + rhs.clientLeft;
newTop -= rhs.offsetTop + rhs.clientTop;
}
return makeArea(newLeft, newTop, width, height);
}
};
}
var parent, elem = this, area = makeArea(
this.offsetLeft, this.offsetTop,
this.offsetWidth, this.offsetHeight);
while ((parent = elem.parentNode) instanceof HTMLElement) {
var clientLeft = parent.offsetLeft + parent.clientLeft;
var clientTop = parent.offsetTop + parent.clientTop;
// Make area relative to parent's client area.
area = area.
relativeFromTo(elem, parent).
translate(-clientLeft, -clientTop);
parent.scrollLeft = withinBounds(
parent.scrollLeft,
area.right - parent.clientWidth, area.left,
parent.clientWidth);
parent.scrollTop = withinBounds(
parent.scrollTop,
area.bottom - parent.clientHeight, area.top,
parent.clientHeight);
// Determine actual scroll amount by reading back scroll properties.
area = area.translate(clientLeft - parent.scrollLeft,
clientTop - parent.scrollTop);
elem = parent;
}
};
}
function chooseDlc(e, name) {
var e1 = document.getElementsByClassName('about-' + name)[0];
var ec = e.control;
var checked = ec ? ec.checked : null;
window.setTimeout(function() {
if (e1 && e1.scrollIntoViewIfNeeded) {
e1.scrollIntoViewIfNeeded(false);
}
if (checked) {
ec.checked = false;
}
if (ec) ec.blur();
}, 0);
return true;
}
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