vue教程2-07 自定义指令

vue教程2-07 自定义指令

自定义指令:
    一、属性:

    Vue.directive(指令名称,function(参数){
        this.el    -> 原生DOM元素
    });

    <div v-red="参数"></div>

    指令名称:     v-red  ->  red

    * 注意: 必须以 v-开头

    拖拽:
    -------------------------------
  二、自定义元素指令:(用处不大)
    Vue.elementDirective('zns-red',{
        bind:function(){
            this.el.style.background='red';
        }
    });

自定义指令写法一:

<div id="box">
        <span v-red>
            asdfasd
        </span>
    </div>

Vue.directive('red',function(){
            this.el.style.background='red';
        });

        window.onload=function(){
            var vm=new Vue({
                el:'#box',
                data:{
                    msg:'welcome'
                }
            });
        };

自定义指令写法二:推荐写法

<div id="box">
        <span v-red="a">
            asdfasd
        </span>
    </div>
//这里的color可以传参
Vue.directive('red',function(color){
            this.el.style.background=color;
        });

        window.onload=function(){
            var vm=new Vue({
                el:'#box',
                data:{
                    a:'blue'
                }
            });
        };

自定义指令写法三:

<div id="box">
        <span v-red>
            asdfasd
        </span>
    </div>

Vue.directive('red',{
            bind:function(){
                this.el.style.background='red';
            }
        });

        window.onload=function(){
            var vm=new Vue({
                el:'#box'
            });
        };

自定义指令:拖拽drag

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title></title>
    <script src="vue.js"></script>
    <script>
        Vue.directive('drag',function(){
            var oDiv=this.el;
            oDiv.onmousedown=function(ev){
                var disX=ev.clientX-oDiv.offsetLeft;
                var disY=ev.clientY-oDiv.offsetTop;

                document.onmousemove=function(ev){
                    var l=ev.clientX-disX;
                    var t=ev.clientY-disY;
                    oDiv.style.left=l+'px';
                    oDiv.style.top=t+'px';
                };
                document.onmouseup=function(){
                    document.onmousemove=null;
                    document.onmouseup=null;
                };
            };
        });

        window.onload=function(){
            var vm=new Vue({
                el:'#box',
                data:{
                    msg:'welcome'
                }
            });
        };

    </script>
</head>
<body>
    <div id="box">
        <div v-drag :style="{'100px', height:'100px', background:'blue', position:'absolute', right:0, top:0}"></div>
        <div v-drag :style="{'100px', height:'100px', background:'red', position:'absolute', left:0, top:0}"></div>
    </div>

</body>
</html>

自定义元素指令

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title></title>
    <style>
        zns-red{
            100px;
            background: gray;
            height:100px;
            display: block;
        }
    </style>
    <script src="vue.js"></script>
    <script>
        Vue.elementDirective('zns-red',{
            bind:function(){
                this.el.style.background='red';
            }
        });

        window.onload=function(){
            var vm=new Vue({
                el:'#box',
                data:{
                    a:'blue'
                }
            });
        };

    </script>
</head>
<body>
    <div id="box">
        <zns-red></zns-red>
    </div>

</body>
</html>
原文地址:https://www.cnblogs.com/baiyangyuanzi/p/6774627.html