.animate动画中间的jquery事件处理程序

问题描述

我做这个

$("#developments ul").animate({
        marginLeft: -1*((ul_width+li_padding)*(how_many_more+1)+how_many_more*ul_padding)},30000,'linear'
    );

当ul的左边距= -1 *((ul_width + li_padding)*(how_many_more)+ how_many_more * ul_padding)时，我想做些什么我可以使用.change()处理函数吗?如果是，我该如何使用该处理程序?我尝试

I want to do something when margin-left of ul=-1*((ul_width+li_padding)*(how_many_more)+how_many_more*ul_padding)Can i use .change() handler? if yes how can i use this handler?I try this

$("#developments ul").css("margin-left").change(function() {
        alert("handler");
    });

但是它不起作用..这是合理的，因为$(#developments ul").css("margin-left")返回一个数字.作为数字的数字是静态的，永远不能改变！有帮助吗?

But it doesn't work..This is reasonable because $("#developments ul").css("margin-left") returns a number.A number as number is static and can't be change never!!Any help?

推荐答案

您可以绑定.animate选项的step属性

You can tie into the step property of the .animate options

$("#developments ul").animate({
    marginLeft: -1 * ((ul_width + li_padding) * (how_many_more + 1) + how_many_more * ul_padding)
}, {
    duration: 30000,
    easing: "linear",
    step: function(now, fx) {
        if (now === -1 * ((ul_width + li_padding) * (how_many_more) + how_many_more * ul_padding)) {
            alert("handler");
        }
    }
});

类似的事情应该起作用.

Something like that should work.

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