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define(function () {
var radioButtonsGroup = {};
// ## RadioButtonsGroup
//
// A group of elements where only one can be active at the same
// time.
//
// When an element is clicked, it becomes the active one. The
// active element gains the 'active' CSS class.
//
// Parameters:
//
// * **elems** Array of elements of the group.
radioButtonsGroup.RadioButtonsGroup = function (elems) {
this.elems = elems;
var active;
for (i = 0; i < elems.length; i++) {
var elem = elems[i];
elem.addEventListener("click", clickHandler);
// The first element that has 'active' CSS class is made
// the active of the group on startup.
if (active === undefined && elem.classList.contains('active')) {
active = elem;
}
}
// If no element has 'active' CSS class, the first element of
// the array is made the active.
if (active === undefined) {
active = elems[0];
updateClasses();
}
function clickHandler(evt) {
active = evt.target;
updateClasses();
}
function updateClasses() {
for (i = 0; i < elems.length; i++) {
var elem = elems[i];
elem.classList.remove('active');
}
active.classList.add('active');
}
// Get the active element.
this.getActive = function () {
return active;
};
};
return radioButtonsGroup;
});
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