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/**
* md-toc.js v1.0.2
* https://github.com/yijian166/md-toc.js
*/
(function (window) {
function Toc(id, options) {
this.el = document.getElementById(id);
if (!this.el) return;
this.options = options || {};
this.tocLevel = parseInt(options.level) || 0;
this.tocClass = options['class'] || 'toc';
this.ulClass = options['ulClass'];
this.tocTop = parseInt(options.top) || 0;
this.elChilds = this.el.children;
if (!this.elChilds.length) return;
this._init();
}
Toc.prototype._init = function () {
this._collectTitleElements();
this._createTocContent();
this._showToc();
};
Toc.prototype._collectTitleElements = function () {
this._elTitlesNames = [],
this.elTitleElements = [];
for (var i = 1; i < 7; i++) {
if (this.el.getElementsByTagName('h' + i).length) {
this._elTitlesNames.push('h' + i);
}
}
this._elTitlesNames.length = this._elTitlesNames.length > this.tocLevel ? this.tocLevel : this._elTitlesNames.length;
for (var j = 0; j < this.elChilds.length; j++) {
this._elChildName = this.elChilds[j].tagName.toLowerCase();
if (this._elTitlesNames.toString().match(this._elChildName)) {
this.elTitleElements.push(this.elChilds[j]);
}
}
};
Toc.prototype._createTocContent = function () {
this._elTitleElementsLen = this.elTitleElements.length;
if (!this._elTitleElementsLen) return;
this.tocContent = '';
this._tempLists = [];
var url = location.origin + location.pathname;
for (var i = 0; i < this._elTitleElementsLen; i++) {
var j = i + 1;
this._elTitleElement = this.elTitleElements[i];
this._elTitleElementName = this._elTitleElement.tagName;
this._elTitleElementText = this._elTitleElement.innerHTML.replace(/<(?:.|\n)*?>/gm, '');
var id = this._elTitleElement.getAttribute('id');
if (!id) {
this._elTitleElement.setAttribute('id', 'tip' + i);
id = '#tip' + i;
} else {
id = '#' + id;
}
this.tocContent += '<li><a href="' + id + '">' + this._elTitleElementText + '</a>';
if (j != this._elTitleElementsLen) {
this._elNextTitleElementName = this.elTitleElements[j].tagName;
if (this._elTitleElementName != this._elNextTitleElementName) {
var checkColse = false,
y = 1;
for (var t = this._tempLists.length - 1; t >= 0; t--) {
if (this._tempLists[t].tagName == this._elNextTitleElementName) {
checkColse = true;
break;
}
y++;
}
if (checkColse) {
this.tocContent += new Array(y + 1).join('</li></ul>');
this._tempLists.length = this._tempLists.length - y;
} else {
this._tempLists.push(this._elTitleElement);
if (this.ulClass)
this.tocContent += '<ul class="' + this.ulClass + '">';
else
this.tocContent += '<ul>';
}
} else {
this.tocContent += '</li>';
}
} else {
if (this._tempLists.length) {
this.tocContent += new Array(this._tempLists.length + 1).join('</li></ul>');
} else {
this.tocContent += '</li>';
}
}
}
if (this.ulClass)
this.tocContent = '<ul class="' + this.ulClass + '">' + this.tocContent + '</ul>';
else
this.tocContent = '<ul>' + this.tocContent + '</ul>';
};
Toc.prototype._showToc = function () {
this.toc = document.createElement('div');
this.toc.innerHTML = this.tocContent;
this.toc.setAttribute('class', this.tocClass);
if (!this.options.targetId) {
this.el.appendChild(this.toc);
} else {
document.getElementById(this.options.targetId).appendChild(this.toc);
}
var self = this;
if (this.tocTop > -1) {
window.onscroll = function () {
var t = document.documentElement.scrollTop || document.body.scrollTop;
if (t < self.tocTop) {
self.toc.setAttribute('style', 'position:absolute;top:' + self.tocTop + 'px;');
} else {
self.toc.setAttribute('style', 'position:fixed;top:10px;');
}
}
}
};
window.Toc = Toc;
})(window);
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