49 lines
1.7 KiB
JavaScript
49 lines
1.7 KiB
JavaScript
/**
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* Copyright 2015 Google Inc. All Rights Reserved.
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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// Navbar scroll buttons
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(function() {
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'use strict';
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var rightScroll = document.querySelector('.scrollindicator.scrollindicator--right');
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var leftScroll = document.querySelector('.scrollindicator.scrollindicator--left');
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var menuBar = document.querySelector('.docs-navigation');
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var delta = 40;
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function updateScrollIndicator() {
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leftScroll.classList.remove('disabled');
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rightScroll.classList.remove('disabled');
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if (menuBar.scrollLeft <= 0) {
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leftScroll.classList.add('disabled');
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}
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// 5px tolerance because browsers!
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if (menuBar.scrollLeft + menuBar.clientWidth + 5 >= menuBar.scrollWidth) {
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rightScroll.classList.add('disabled');
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}
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}
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menuBar.addEventListener('scroll', updateScrollIndicator);
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updateScrollIndicator();
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function scrollMenuBar(delta) {
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menuBar.scrollLeft += delta;
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}
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rightScroll.addEventListener('click', scrollMenuBar.bind(null, delta));
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rightScroll.addEventListener('tap', scrollMenuBar.bind(null, delta));
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leftScroll.addEventListener('click', scrollMenuBar.bind(null, -delta));
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leftScroll.addEventListener('tap', scrollMenuBar.bind(null, -delta));
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})();
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