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Scrollspy.js
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Scrollspy.js
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/* ==========================================================
* Scrollspy.js v3.0.0
* ==========================================================
* Copyright 2012 xsokev
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
* ========================================================== */
define([
'./Support',
'dojo/_base/declare',
'dojo/query',
'dojo/_base/lang',
'dojo/_base/window',
'dojo/on',
'dojo/dom-class',
'dojo/dom-construct',
'dojo/dom-attr',
'dojo/dom-geometry',
'dojo/NodeList-dom',
'dojo/NodeList-traverse',
'dojo/domReady!'
], function (support, declare, query, lang, win, on, domClass, domConstruct, domAttr, domGeom) {
"use strict";
var spySelector = '[data-spy=scroll]';
var Scrollspy = declare([], {
defaultOptions:{
offset:10
},
constructor:function (element, options) {
this.options = lang.mixin(lang.clone(this.defaultOptions), (options || {}));
this.domNode = element.tagName === 'BODY' ? win.global : element;
this.element = element;
this.scrollEvent = on(this.domNode, 'scroll', lang.hitch(this, 'process'));
this.selector = this.options.target;
if (!this.selector) {
this.selector = support.hrefValue(element);
}
this.selector = ' .nav li > a';
this.refresh();
this.process();
},
refresh:function () {
this.offsets = [];
this.targets = [];
var container_offset = domGeom.position(this.element, false).y;
query(this.selector, win.body()).map(function (node) {
var href = support.getData(node, 'target') || domAttr.get(node, 'href');
var target = /^#\w/.test(href) && query(href);
var pos;
if (target[0]) {
pos = domGeom.position(target[0], false);
}
return (target && target.length && [ pos.y - container_offset, href ] ) || null;
})
.filter(function (item) {
return item;
})
.sort(function (a, b) {
return a[0] - b[0];
})
.forEach(function (item) {
this.offsets.push(item[0]);
this.targets.push(item[1]);
}, this);
},
process:function () {
var dompos = domGeom.position(this.element, false);
// scrollTop determines how much the element is scrolled.
//
// In firefox, body has scrollTop set to 0 even when scrolled - hence we use dompos.y
if (this.element.tagName === "BODY") {
var scrollTop = Math.abs(Math.round(dompos.y));
}
else {
var scrollTop = this.element.scrollTop;
}
scrollTop = parseInt(this.options.offset, 10)
var scrollHeight = this.element.scrollHeight || win.body().scrollHeight;
//TODO: innerHeight may not work across browsers
var domHeight = (this.element.tagName === "BODY") ? this.domNode.innerHeight : dompos.h;
var maxScroll = Math.abs(scrollHeight - domHeight);
var offsets = this.offsets;
var targets = this.targets;
var activeTarget = this.activeTarget;
var i;
if (scrollTop >= maxScroll) {
return activeTarget !== (i = targets[targets.length - 1]) && this.activate(i);
}
for (i = offsets.length; i--;) {
if (activeTarget !== targets[i] && scrollTop >= offsets[i] && (!offsets[i 1] || scrollTop <= offsets[i 1])) {
this.activate(targets[i]);
}
}
},
activate:function (target) {
this.activeTarget = target;
query(this.selector).parent('.active').removeClass('active');
var selector = this.selector '[data-target="' target '"],' this.selector '[href="' target '"]';
var active = query(selector).parent('li').addClass('active');
if (active.parent('.dropdown-menu').length) {
active = active.closest('li.dropdown').addClass('active');
}
on.emit(active[0], 'activate.bs.scrollspy', {bubbles:false, cancelable:false});
}
});
lang.extend(query.NodeList, {
scrollspy:function (option) {
var options = (lang.isObject(option)) ? option : {};
return this.forEach(function (node) {
var data = support.getData(node, 'scrollspy');
if (!data) {
support.setData(node, 'scrollspy', (data = new Scrollspy(node, options)));
}
if (lang.isString(option)) {
data[option].call(data);
}
});
}
});
query(spySelector).forEach(function (node) {
query(node).scrollspy(support.getData(node));
});
return Scrollspy;
});