Example code for drag and drop using angular
There are many ways to write drag and drop. Let’s take a look at the angular version of drag and drop. The code is as follows:
<!DOCTYPE html>
<html ng-app="myApp">
<head>
<meta charset="UTF-8">
<title></title>
<style type="text/css">
#box{
width: 100px;
height: 100px;
background: black;
/*一定要给当前元素设置绝对定位*/
position: absolute;
left: 0;
top: 0;
}
</style>
</head>
<body>
<div id="box" my-drag></div>
</body>
<script src="jquery-3.1.1.min.js?1.1.11" type="text/javascript" charset="utf-8"></script>
<script src="../js/angular.min.js?1.1.11" type="text/javascript" charset="utf-8"></script>
<script type="text/javascript">
// 自定义一个模块
var app = angular.module("myApp",[]);
// 自定义指令 自定义指令时一定要使用驼峰命名法
app.directive('myDrag',function(){
// 返回一个函数
return{
link : function(scope,element,attr){
// scope可以接收到的数据
// element 当前的元素
// attr属性
// 拖拽的三大事件mousedown,mousemove,mouseup.使用jq绑定事件的方法进行绑定
element.on('mousedown',function(ev){
// 通过event获取到当前对象
var This = $(this);
// 获取到鼠标离当前元素上边框的距离
var disX = ev.clientX - $(this).offset().left;
// 获取到元素距离左边框的距离
// 因为在拖拽的过程中不变的是鼠标距离元素边框的距离 通过不变和已知求变量
var disY = ev.clientY - $(this).offset().top;
$(document).on('mousemove',function(ev){
// 将所改变的值通过样式设置给当前元素
This.css({
left:ev.clientX - disX,
top:ev.clientY - disY,
});
});
$(document).on('mouseup',function(){
// 鼠标松开时关闭所有事件
$(document).off();
})
})
},
restrict:'A', //ECMA E元素 C类名 M注释 A属性
};
});
</script>
</html>
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