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94 lines
3.9 KiB
JavaScript
94 lines
3.9 KiB
JavaScript
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/*
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* Table of Contents jQuery Plugin - jquery.toc
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*
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* Copyright 2013 Nikhil Dabas
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*
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* Licensed under the Apache License, Version 2.0 (the "License"); you may not use this file except
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* in compliance with the License. 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 distributed under the License
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* is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express
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* or implied. See the License for the specific language governing permissions and limitations
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* under the License.
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*/
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(function ($) {
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"use strict";
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// Builds a list with the table of contents in the current selector.
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// options:
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// content: where to look for headings
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// headings: string with a comma-separated list of selectors to be used as headings, ordered
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// by their relative hierarchy level
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var toc = function (options) {
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return this.each(function () {
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var root = $(this),
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data = root.data(),
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thisOptions,
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stack = [root], // The upside-down stack keeps track of list elements
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listTag = this.tagName,
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currentLevel = 0,
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headingSelectors;
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// Defaults: plugin parameters override data attributes, which override our defaults
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thisOptions = $.extend(
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{content: "body", headings: "h1,h2,h3"},
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{content: data.toc || undefined, headings: data.tocHeadings || undefined},
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options
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);
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headingSelectors = thisOptions.headings.split(",");
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// Set up some automatic IDs if we do not already have them
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$(thisOptions.content).find(thisOptions.headings).attr("id", function (index, attr) {
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// Generate a valid ID: must start with a letter, and contain only letters and
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// numbers. All other characters are replaced with underscores.
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return attr ||
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$(this).text().replace(/^[^A-Za-z]*/, "").replace(/[^A-Za-z0-9]+/g, "_");
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}).each(function () {
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// What level is the current heading?
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var elem = $(this), level = $.map(headingSelectors, function (selector, index) {
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return elem.is(selector) ? index : undefined;
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})[0];
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if (level > currentLevel) {
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// If the heading is at a deeper level than where we are, start a new nested
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// list, but only if we already have some list items in the parent. If we do
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// not, that means that we're skipping levels, so we can just add new list items
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// at the current level.
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// In the upside-down stack, unshift = push, and stack[0] = the top.
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var parentItem = stack[0].children("li:last")[0];
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if (parentItem) {
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stack.unshift($("<" + listTag + "/>").appendTo(parentItem));
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}
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} else {
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// Truncate the stack to the current level by chopping off the 'top' of the
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// stack. We also need to preserve at least one element in the stack - that is
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// the containing element.
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stack.splice(0, Math.min(currentLevel - level, Math.max(stack.length - 1, 0)));
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}
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// Add the list item
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$("<li/>").appendTo(stack[0]).append(
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$("<a/>").text(elem.text()).attr("href", "#" + elem.attr("id"))
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);
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currentLevel = level;
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});
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});
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}, old = $.fn.toc;
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$.fn.toc = toc;
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$.fn.toc.noConflict = function () {
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$.fn.toc = old;
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return this;
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};
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// Data API
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$(function () {
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toc.call($("[data-toc]"));
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});
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}(window.jQuery));
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