官方教程：Dojo Effects
这里讲学习一下dojo如何实现淡入、淡出、滑动等效果。
实现这些特殊的效果有两个包 dojo/_base/fx 和
dojo/fx。
dojo/_base/fx 中提供了一些基础的animation方法，如： animateProperty,
anim, fadeIn, and fadeOut.
dojo/fx
中提供了一些高级的animation方法，如：chain, combine,
wipeIn, wipeOut and
slideTo。
淡入淡出require(["dojo/_base/fx",
"dojo/on", "dojo/dom",
"dojo/domReady!"],
function(fx, on, dom) {
var fadeOutButton =
dom.byId("fadeOutButton"),//淡出按钮
fadeInButton =
dom.byId("fadeInButton"),//淡入按钮
fadeTarget =
dom.byId("fadeTarget");//目标节点
on(fadeOutButton,
"click",
function(evt){
fx.fadeOut({ node: fadeTarget
}).play();//淡出
});
on(fadeInButton,
"click",
function(evt){
fx.fadeIn({ node: fadeTarget
}).play();//淡入
});
});
在所有的方法中包含后面介绍的，都只有一个对象参数，这个对象中可包含多个属性，必不可少的一个属性就是node，为要实现效果的节点对象或id字符串。
在fadeOut/fadeIn方法中还有一个属性duration，持续的时间，默认为350ms。这些animation方法将返回一animation对象，该对象包含一些方法：play,
pause, stop, status, and
gotoPercent，用来执行，暂停，停止，查看状态及执行到某种程度。
擦除require(["dojo/fx",
"dojo/on", "dojo/dom",
"dojo/domReady!"],
function(fx, on, dom) {
var wipeOutButton =
dom.byId("wipeOutButton"),
wipeInButton =
dom.byId("wipeInButton"),
wipeTarget =
dom.byId("wipeTarget");
on(wipeOutButton,
"click",
function(evt){
fx.wipeOut({ node: wipeTarget
}).play();
});
on(wipeInButton,
"click",
function(evt){
fx.wipeIn({ node: wipeTarget
}).play();
});
});
同淡入淡出一样
滑动
require(["dojo/fx",
"dojo/on", "dojo/dom",
"dojo/domReady!"],
function(fx, on, dom) {
var slideAwayButton =
dom.byId("slideAwayButton"),
slideBackButton =
dom.byId("slideBackButton"),
slideTarget =
dom.byId("slideTarget");
on(slideAwayButton,
"click",
function(evt){
fx.slideTo({ node: slideTarget, left:
"200", top: "200"
}).play();
});
on(slideBackButton,
"click",
function(evt){
fx.slideTo({ node: slideTarget, left:
"0", top: "100"
}).play();
});
});
在slideTo方法的参数中，除了节点对象属性外，还有left和top两个属性，用来设置滑动到目的位置的坐标。
事件
require(["dojo/fx",
"dojo/on", "dojo/dom-style",
"dojo/dom",
"dojo/domReady!"],
function(fx, on, style, dom) {
var slideAwayButton =
dom.byId("slideAwayButton"),
slideBackButton =
dom.byId("slideBackButton"),
slideTarget =
dom.byId("slideTarget");
on(slideAwayButton,
"click",
function(evt){
// Note that we're specifying the
beforeBegin as a property of the animation
// rather than using connect. This
ensures that our beforeBegin handler
// executes before any
others.
var anim =
fx.slideTo({
node: slideTarget,
left:
"200",
top:
"200",
beforeBegin:
function(){
console.warn("slide
target is: ", slideTarget); style.set(slideTarget,
{ left:
"0px", top:
"100px" }); } });
// We could have also specified onEnd
above alongside beforeBegin,
// but it's just as easy to connect like
so
on(anim,
"End", function(){
style.set(slideTarget,
{ backgroundColor:
"blue" }); },
true); // Don't forget to actually start the
animation!
anim.play();
});
on(slideBackButton,
"click",
function(evt){
var anim =
fx.slideTo({
node: slideTarget,
left:
"0",
top:
"100",
beforeBegin:
function(){
style.set(slideTarget,
{ left:
"200px", top:
"200px" }); } });
on(anim,
"End",
function(){
style.set(slideTarget,
{ backgroundColor:
"red" }); },
true); anim.play();
});
});
在实现动态效果的过程中会产生两个事件，一个是beforeBegin，在执行之前调用；一个是onEnd，在执行完后调用。
在上面的例子中可以看到，beforeBegin是作为参数对象中的一个方法来定义的；onEnd是作为animation对象的一个事件在on中定义的。
连锁反应
require(["dojo/_base/fx",
"dojo/fx", "dojo/on",
"dojo/dom",
"dojo/domReady!"],
function(baseFx, fx, on, dom) {
var slideAwayButton =
dom.byId("slideAwayButton"),
slideBackButton =
dom.byId("slideBackButton"),
slideTarget =
dom.byId("slideTarget");
// Set up a couple of click handlers to run our
chained animations
on(slideAwayButton,
"click",
function(evt){
fx.chain([
baseFx.fadeIn({ node: slideTarget
}),
fx.slideTo({ node: slideTarget, left:
"200", top: "200"
}),
baseFx.fadeOut({ node: slideTarget
})
]).play();
});
on(slideBackButton,
"click",
function(evt){
fx.chain([
baseFx.fadeIn({ node: slideTarget
}),
fx.slideTo({ node: slideTarget, left:
"0", top: "100"
}),
baseFx.fadeOut({ node: slideTarget
})
]).play();
});
});
chain用来将多个animation动作连接起来按顺序执行，它的参数即是由不同animation方法返回的animation对象组成的数组，执行的顺序就是数组的先后顺序。
联合
require(["dojo/_base/fx",
"dojo/fx", "dojo/on",
"dojo/dom",
"dojo/domReady!"],
function(baseFx, fx, on, dom) {
var slideAwayButton =
dom.byId("slideAwayButton"),
slideBackButton =
dom.byId("slideBackButton"),
slideTarget =
dom.byId("slideTarget");
// Set up a couple of click handlers to run our
combined animations
on(slideAwayButton,
"click",
function(evt){
fx.combine([
baseFx.fadeIn({ node: slideTarget
}),
fx.slideTo({ node: slideTarget, left:
"200", top: "200"
})
]).play();
});
on(slideBackButton,
"click",
function(evt){
fx.combine([
fx.slideTo({ node: slideTarget, left:
"0", top: "100"
}),
baseFx.fadeOut({ node: slideTarget
})
]).play();
});
});
combine方法是将多个animation动作联合起来同时执行实现一个完成的动态效果。其参数也是由不同animation方法返回的animation对象组成的数组。