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https://github.com/Jermolene/TiddlyWiki5
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111 lines
2.9 KiB
JavaScript
111 lines
2.9 KiB
JavaScript
/*\
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title: $:/core/modules/utils.dom.js
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type: application/javascript
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module-type: utils
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Various static DOM-related utility functions.
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\*/
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(function(){
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/*jslint node: true, browser: true */
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/*global $tw: false */
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"use strict";
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/*
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Determines whether element 'a' contains element 'b'
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Code thanks to John Resig, http://ejohn.org/blog/comparing-document-position/
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*/
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exports.domContains = function(a,b) {
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return a.contains ?
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a != b && a.contains(b) :
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!!(a.compareDocumentPosition(b) & 16);
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};
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exports.hasClass = function(el,className) {
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return el.className.split(" ").indexOf(className) !== -1;
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};
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exports.addClass = function(el,className) {
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var c = el.className.split(" ");
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if(c.indexOf(className) === -1) {
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c.push(className);
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}
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el.className = c.join(" ");
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};
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exports.removeClass = function(el,className) {
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var c = el.className.split(" "),
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p = c.indexOf(className);
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if(p !== -1) {
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c.splice(p,1);
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el.className = c.join(" ");
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}
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};
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exports.toggleClass = function(el,className,status) {
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if(status === undefined) {
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status = !exports.hasClass(el,className);
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}
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if(status) {
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exports.addClass(el,className);
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} else {
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exports.removeClass(el,className);
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}
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};
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exports.applyStyleSheet = function(id,css) {
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var el = document.getElementById(id);
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if(document.createStyleSheet) { // Older versions of IE
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if(el) {
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el.parentNode.removeChild(el);
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}
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document.getElementsByTagName("head")[0].insertAdjacentHTML("beforeEnd",
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' <style id="' + id + '" type="text/css">' + css + '</style>'); // fails without
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} else { // Modern browsers
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if(el) {
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el.replaceChild(document.createTextNode(css), el.firstChild);
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} else {
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el = document.createElement("style");
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el.type = "text/css";
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el.id = id;
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el.appendChild(document.createTextNode(css));
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document.getElementsByTagName("head")[0].appendChild(el);
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}
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}
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};
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/*
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Smoothly scroll an element back into view if needed
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*/
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exports.scrollIntoView = function(element) {
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var slowInSlowOut = function(t) {
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return (1 - ((Math.cos(t * Math.PI) + 1) / 2));
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},
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animateScroll = function(startX,startY,endX,endY,duration) {
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var startTime = new Date(),
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timerId = window.setInterval(function() {
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var t = ((new Date()) - startTime) / duration;
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if(t >= 1) {
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window.clearInterval(timerId);
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t = 1;
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}
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t = slowInSlowOut(t);
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var x = startX + (endX - startX) * t,
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y = startY + (endY - startY) * t;
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window.scrollTo(x,y);
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}, 10);
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},
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x = element.offsetLeft,
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y = element.offsetTop,
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winWidth = window.innerWidth,
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winHeight = window.innerHeight,
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scrollLeft = window.scrollX || document.documentElement.scrollLeft,
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scrollTop = window.scrollY || document.documentElement.scrollTop;
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if((x < scrollLeft) || (x > (scrollLeft + winWidth)) || (y < scrollTop) || (y > (scrollTop + winHeight))) {
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animateScroll(scrollLeft,scrollTop,x,y,$tw.config.preferences.animationDuration);
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}
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};
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})();
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