我正在努力理解为什么过渡效果不如预期。它应该应用“ from”,然后将“ transition”添加到“ el”,然后它应该运行“ to”,最后在onTransitionEnd上它应该运行“ callback”(之前是一些清除代码)过渡属性)。

在Webkit浏览器中,它可以正确转换slideDown,但是slideUp是即时的。在Firefox中反之亦然。

尔格?

JSFiddle:http://jsfiddle.net/enhTd/

var $ = function(query) {
                var a = [],
                    n = document.querySelectorAll(query),
                    l = n.length;

                for( var i = 0; i<l; i++){
                    a.push(n[i]);
                    }
                if(l>1) {return a;} else {return a[0];}

                },
    $id = function(query) { return document.getElementById(query);},
    getSupportedPropertyName = function(properties) {
        for (var i = 0; i < properties.length; i++) {
            if (typeof document.body.style[properties[i]] != "undefined") {
                return properties[i];
            }
        }
        return null;
    },
    vendorTransitions = ["transition", "msTransition", "webkitTransition", "MozTransition", "OTransition"],
    prefixedTransitionProperty = getSupportedPropertyName(vendorTransitions),
    transition = function(opts){

        opts.from && opts.from();

        if(prefixedTransitionProperty){
            var c = opts.callback || function() {},
                el = opts.el,
                cb = function(event){
                    var ev = event, callback = c;
                    ev.target.removeEventListener(prefixedTransitionProperty+"End", cb);
                    ev.target.style[prefixedTransitionProperty] = "none";
                    if(callback) {
                        callback(ev);
                        }
                    };

            el.style[prefixedTransitionProperty] = opts.transition || "";
            el.addEventListener(prefixedTransitionProperty+"End", cb);
        }

        opts.to && opts.to();

    },
    slideDown = function(el, t){
        var style = el.style,
            h, oh = el.offsetHeight,
            t = t || 1000;

        //Grab real height
        style.height = "";
        h = el.offsetHeight;

        transition({
            "el": el,
            transition: "height "+t+"ms ease",
            from: function() {
                style.height = oh+"px";
            },
            to: function(){
                style.overflow = "hidden";
                style.height = h+"px";
                },
            callback: function(event){
                event.target.style.height = "";
                }
            });


    },
    slideUp = function(el, t){
        var style = el.style,
            h = el.offsetHeight,
            t = t || 1000;

        transition({
            "el": el,
            transition: "height "+t+"ms ease",
            from: function() {
                style.height = h+"px";
                },
            to: function(){
                style.overflow = "hidden";
                style.height = "0";
                }
            });

    },
    slideToggle = function(el, t){
        var t = t || 1000;

        if(el.style.height=="0px"){
            slideDown(el, t);
        } else {
            slideUp(el, t);
        }
    };


slideUp($id("intro"));
$("a[href='#intro']").forEach(function(el){
    el.addEventListener("click", function(ev) {
        ev.preventDefault();
        if(ev.target.classList.contains("hide")){
            slideUp($(ev.target.hash));
        } else {
            slideDown($(ev.target.hash));
        }
    });
});
$("li h3").forEach(function(el){
    el.addEventListener("click", function(ev) {
        ev.preventDefault();
        slideToggle(ev.target.parentNode);
    });
});

最佳答案

在某些浏览器中,您不能仅设置初始状态,设置最终状态并期望CSS转换起作用。

相反,必须先设置初始状态,然后再呈现它,然后才能设置最终状态并期望过渡能够运行。使其呈现的最简单方法是返回到事件循环,然后在setTimeout()调用之后进行任何进一步的处理(如设置最终状态)。

关于javascript - 使用不正常的Javascript在两个状态之间应用过渡,我们在Stack Overflow上找到一个类似的问题:https://stackoverflow.com/questions/15306931/

10-12 13:06
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