最近写了一个放大镜效果的应用，本来想用原生的angularjs写的。但是发现用原生angularjs，无论如何都不能获取里面图片的宽度和高度，因为angularjs内置的jquery方法里没有winth()、height()方法。所以我还是引入了jquery，在同一scope上绑定了宽度高度。
下面上源码，顺便我会把里面的坑说一下。
捕获.JPG
<!DOCTYPE html>
<html lang="en" ng-app="magnifierAPP">
<head>
<meta charset="UTF-8">
<title></title>
<script src="lib/angular.min.js" type="text/javascript"></script>
<script src="lib/angular-animate.js" type="text/javascript"></script>
<script src="lib/jquery-2.1.4.min.js" type="text/javascript"></script>
</head>
<style>
*{
padding: 0px;
margin: 0px;
}
.content{
width: 800px;
height: 400px;
position: relative;
border: 1px solid red;
}
.left{
width: 310px;
height: 380px;
}
.top{
width: 310px;
height: 310px;
border: 1px solid blue;
cursor: pointer;
}
.top img{
width: 310px;
height: 310px;
}
.bottom{
position: relative;
width: 310px;
height: 60px;
border: 1px solid black;
}
.bottom img{
display: inline-block;
width: 60px;
height: 60px;
float: left;
margin: 0 30px;
cursor: pointer;
}
.right{
border: 1px solid ;
width: 300px;
height: 300px;
position: absolute;
left: 400px;
top: 20px;
overflow: hidden;
}
.right img{
position: absolute;
width: 700px;
height: 600px;
}
.show{
display: block;
}
.hidden{
display: none;
}
</style>
<body>
<div ng-controller="magnifierController">
<div class="content">
<div class="left" ng-init="isActive=0">
<div>{{x}}+{{y}}</div>
<div magnifier-top></div>
<div class="bottom" >
<img src="img/blue_1.jpg" alt="1" ng-mouseover="isActive=0"/>
<img src="img/yellow_1.jpg" alt="1" ng-mouseover="isActive=1"/>
</div>
</div>
<div magnifier-right>
<div>{{x}}+{{y}}</div>
</div>
</div>
<script type="text/ng-template" id="magnifier-top.html">
<div class="top" ng-mousemove="getPosition($event.offsetX,$event.offsetY)" ng-mouseover="isshow=true" ng-mouseleave="isshow=false">
<img src="img/blue_2.jpg" alt="0" ng-class="{true:'show',false:'hidden'}[isActive==0]"/>
<img src="img/yellow_2.jpg" alt="1" ng-class="{true:'show',false:'hidden'}[isActive==1]"/>
</div>
</script>
<script type="text/ng-template" id="magnifier-right.html" >
<div class="right" >
<img src="{{img1.src}}" alt="1" ng-class="{true:'show',false:'hidden'}[isActive==0]" id="img1"/>
<img src="{{img2.src}}" alt="1" ng-class="{true:'show',false:'hidden'}[isActive==1]"/>
</div>
</script>
</div>
</body>
<script>
var app=angular.module('magnifierAPP',[]);
app.controller('magnifierController',['$scope', function ($scope) {
}]);
app.directive('magnifierRight',['readJson',function (readJson) {
return {
restrict: 'EA',
replace:true,
templateUrl:'magnifier-right.html',
link: function (scope,element,attr) {
var promise=readJson.getJson();
promise.then(function (data) {
scope.img1=data[0];
scope.img2=data[1];
});
//右侧容器内照片宽度、高度
scope.rightWidth=$(element).find("img").eq(scope.isActive).width();
scope.rightHeight=$(element).find("img").eq(scope.isActive).height();
//右侧容器宽度、高度
scope.rightBoxWidth=$(element).width();
scope.rightBoxHeight=$(element).height();
//移动比例
var radX=(scope.rightWidth-scope.rightBoxWidth)/scope.topWidth;
var radY=(scope.rightHeight-scope.rightBoxHeight)/scope.topHeight;
console.log(radX);
console.log(radY);
setInterval(function (){
scope.$apply(function (){
element.find("img").eq(scope.isActive).css({
"left":-scope.x*radX+"px",
"top":-scope.y*radY+"px"
});
})
},30)
}
}
}]);
app.directive('magnifierTop',[function () {
return{
restrict:'EA',
replace:true,
templateUrl:'magnifier-top.html',
link: function (scope,element,attr) {
scope.topWidth=$(element).find("img").eq(scope.isActive).width();
scope.topHeight=$(element).find("img").eq(scope.isActive).height();
scope.getPosition= function (x,y) {
scope.x=x;
scope.y=y;
}
}
}
}]);
app.factory('readJson',['$http','$q', function ($http,$q) {
return{
getJson: function (){
var deferred=$q.defer();
$http({
method:'GET',
url:'magnifier.json'
}).success(function (data, status, header, config) {
deferred.resolve(data);
}).error(function (data, status, header, config) {
deferred.reject(data);
});
return deferred.promise;
}
}
}]);
</script>
</html>
1、首先使用了两个同级指令，并在两个同级指令间进行通信，同级指令间通信，非常简单，就是不要让同级的指令生成独立的scope，并且在同一个作用域下就完成了。如果指令scope没有特殊声明，那么就是父scope。指令生成的模板没有特殊意义，除非在特定的scope下编译，默认情况下，指令并不会创建新的子scope，更多的是使用父scope，也就是说，如果指令存在一个controller下，它会使用controller下的scope。
2、然后就是用$q来延迟异步获取数据，这个也可以看一下$q的用法。
