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POAnimation fade | jQuery vs pure js | setInterval vs. setTimeout
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copied!<p>I have this tested function below that works fine for fading an element in or out.</p> <p>What do I gain by using JQuery?</p> <p>Thanks</p> <pre><code>Effects.prototype.fade = function( direction, max_time, element ) { var elapsed = 0; function next() { elapsed += 10; if (direction === 'up') { element.style.opacity = elapsed / max_time; } else if (direction === 'down') { element.style.opacity = (max_time - elapsed) / max_time; } if (elapsed <= max_time) { setTimeout(next, 10); } } next(); }; </code></pre> <p>Running a search on fadeIn() on the core jquery library I get one hit here:</p> <pre><code>jQuery.each({ slideDown: genFx( "show", 1 ), slideUp: genFx( "hide", 1 ), slideToggle: genFx( "toggle", 1 ), fadeIn: { opacity: "show" }, fadeOut: { opacity: "hide" }, fadeToggle: { opacity: "toggle" } }, function( name, props ) { jQuery.fn[ name ] = function( speed, easing, callback ) { return this.animate( props, speed, easing, callback ); }; }); </code></pre> <p>Using the <a href="http://james.padolsey.com/jquery/#v=1.6.2&fn=animate" rel="nofollow">JQuery Source Viewer</a></p> <pre><code>function (prop, speed, easing, callback) { var optall = jQuery.speed(speed, easing, callback); if (jQuery.isEmptyObject(prop)) { return this.each(optall.complete, [false]); } prop = jQuery.extend({}, prop); return this[optall.queue === false ? "each" : "queue"](function () { if (optall.queue === false) { jQuery._mark(this); } var opt = jQuery.extend({}, optall), isElement = this.nodeType === 1, hidden = isElement && jQuery(this).is(":hidden"), name, val, p, display, e, parts, start, end, unit; opt.animatedProperties = {}; for (p in prop) { name = jQuery.camelCase(p); if (p !== name) { prop[name] = prop[p]; delete prop[p]; } val = prop[name]; if (jQuery.isArray(val)) { opt.animatedProperties[name] = val[1]; val = prop[name] = val[0]; } else { opt.animatedProperties[name] = opt.specialEasing && opt.specialEasing[name] || opt.easing || "swing"; } if (val === "hide" && hidden || val === "show" && !hidden) { return opt.complete.call(this); } if (isElement && (name === "height" || name === "width")) { opt.overflow = [this.style.overflow, this.style.overflowX, this.style.overflowY]; if (jQuery.css(this, "display") === "inline" && jQuery.css(this, "float") === "none") { if (!jQuery.support.inlineBlockNeedsLayout) { this.style.display = "inline-block"; } else { display = defaultDisplay(this.nodeName); if (display === "inline") { this.style.display = "inline-block"; } else { this.style.display = "inline"; this.style.zoom = 1; } } } } } if (opt.overflow != null) { this.style.overflow = "hidden"; } for (p in prop) { e = new jQuery.fx(this, opt, p); val = prop[p]; if (rfxtypes.test(val)) { e[val === "toggle" ? hidden ? "show" : "hide" : val](); } else { parts = rfxnum.exec(val); start = e.cur(); if (parts) { end = parseFloat(parts[2]); unit = parts[3] || (jQuery.cssNumber[p] ? "" : "px"); if (unit !== "px") { jQuery.style(this, p, (end || 1) + unit); start = (end || 1) / e.cur() * start; jQuery.style(this, p, start + unit); } if (parts[1]) { end = (parts[1] === "-=" ? -1 : 1) * end + start; } e.custom(start, end, unit); } else { e.custom(start, val, ""); } } } return true; }); } </code></pre>

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