mirror of https://github.com/zulip/zulip.git
91 lines
2.5 KiB
JavaScript
91 lines
2.5 KiB
JavaScript
var hashchange = (function () {
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var exports = {};
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var expected_hash = false;
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exports.changehash = function (newhash) {
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expected_hash = newhash;
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// Some browsers reset scrollTop when changing the hash to "",
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// so we save and restore it.
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// http://stackoverflow.com/questions/4715073/window-location-hash-prevent-scrolling-to-the-top
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var scrolltop;
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if (newhash === "") {
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scrolltop = viewport.scrollTop();
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}
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window.location.hash = newhash;
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util.reset_favicon();
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if (newhash === "") {
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viewport.scrollTop(scrolltop);
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}
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};
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exports.save_narrow = function (operators) {
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if (operators === undefined) {
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exports.changehash('#');
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} else {
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var new_hash = '#narrow';
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$.each(operators, function (idx, elem) {
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new_hash += '/' + encodeURIComponent(elem[0])
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+ '/' + encodeURIComponent(elem[1]);
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});
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exports.changehash(new_hash);
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}
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};
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function parse_narrow(hash) {
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var i, operators = [];
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for (i=1; i<hash.length; i+=2) {
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// We don't construct URLs with an odd number of components,
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// but the user might write one.
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var operator = decodeURIComponent(hash[i]);
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var operand = decodeURIComponent(hash[i+1] || '');
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operators.push([operator, operand]);
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}
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narrow.activate(operators);
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}
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// Returns true if this function performed a narrow
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function hashchanged() {
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// If window.location.hash changed because our app explicitly
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// changed it, then we don't need to do anything.
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// (This function only neds to jump into action if it changed
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// because e.g. the back button was pressed by the user)
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if (window.location.hash === expected_hash) {
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return false;
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}
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var hash = window.location.hash.split("/");
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switch (hash[0]) {
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case "#narrow":
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ui.change_tab_to("#home");
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parse_narrow(hash);
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ui.update_floating_recipient_bar();
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return true;
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case "":
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case "#":
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ui.change_tab_to("#home");
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narrow.deactivate();
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ui.update_floating_recipient_bar();
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break;
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case "#subscriptions":
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ui.change_tab_to("#subscriptions");
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break;
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case "#settings":
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ui.change_tab_to("#settings");
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break;
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}
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return false;
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}
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exports.initialize = function () {
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window.onhashchange = hashchanged;
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if (hashchanged()) {
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load_more_messages();
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}
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};
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return exports;
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}());
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