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hash.js
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hash.js
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wax = wax || {};
// Hash
// ----
wax.hash = function(options) {
options = options || {};
function getState() {
return location.hash.substring(1);
}
function pushState(state) {
var l = window.location;
l.replace(l.toString().replace((l.hash || /$/), '#' + state));
}
var s0, // old hash
hash = {},
lat = 90 - 1e-8; // allowable latitude range
function parseHash(s) {
var args = s.split('/');
for (var i = 0; i < args.length; i++) {
args[i] = Number(args[i]);
if (isNaN(args[i])) return true;
}
if (args.length < 3) {
// replace bogus hash
return true;
} else if (args.length == 3) {
options.setCenterZoom(args);
}
}
function move() {
var s1 = options.getCenterZoom();
if (s0 !== s1) {
s0 = s1;
// don't recenter the map!
pushState(s0);
}
}
function stateChange(state) {
// ignore spurious hashchange events
if (state === s0) return;
if (parseHash(s0 = state)) {
// replace bogus hash
move();
}
}
var _move = wax.u.throttle(move, 500);
hash.add = function() {
stateChange(getState());
options.bindChange(_move);
return this;
};
hash.remove = function() {
options.unbindChange(_move);
return this;
};
return hash.add();
};