1、 this.$refs.* 拿到虚拟Dom,可以进行真实dom的一切操作

1)在标签中添加ref="*"

2)在方法中用this.$refs.*拿到这个元素,跟document.getElementById('*')一样。

 

2、自定义指令中,el就是当前环境下的Dom元素

  el.style.color = "yellow";
  console.log(el.tagName);//均可执行

 

<!DOCTYPE html>

<html>

<head>

    <meta charset="utf-8">

    <title>自定义指令</title>

    <script src="js/vue.js" type="text/javascript"></script>

    <style type="text/css">

     .app{

     width:300px;

     height: 300px;

     border: 1px solid #00ff00;

     }

    /* .app .child{

     position: relative;

     top:320px;

     width:330px;

     height: 300px;

     border: 2px solid red;

     }*/

    </style>

</head>

<body>

<div class="app">

<div v-color="colors[1].color1" name="tc">oooooo</div>

<my-card v-bind:obj="colors" name="zy">

<!-- <div class="child" v-demo:foo.a.b="color2">lalala</div> -->

</my-card>

</div>

<script>

/*钩子函数:

bind、inserted、update、componentUpdated、unbind

  钩子函数的参数:

    el、binding、vnode、oldVnode

*/

Vue.directive('color', function (el, binding) {

  console.log("%%%%拿到当前域的真实dom%%%%");

  console.log(el);

  el.style.color = "yellow";

  console.log(el.tagName);

  

  console.log("%%%%查看自定义指令v-color本身的一些属性%%%%");

  el.style.backgroundColor = binding.value;

  console.log(binding.name+","+binding.value+","+binding.expression+","+binding.arg);

})

Vue.component("my-card",{

template:'<div ref="card" v-on:click="toclick" v-color="obj[0].color0">12345678</div>',

props:['obj'],

methods:{

toclick: function(){

console.log("%%%%拿到props数据%%%%%");

console.log(this.obj[0].color0);

console.log("%%%%拿到虚拟dom%%%%");

console.log(this.$refs.card);

console.log("%%%%拿到非prop传入的name的属性值%%%%%");

console.log(this.$refs.card.getAttribute('name'));

}

}

})

 

// Vue.directive('demo',{

// bind: function(el,binding,vnode){

// el.innerHTML =

// 'name: ' + binding.name + '<br/>' +

// 'value: ' + binding.value + '<br/>' +

// 'expression: ' + binding.expression + '<br/>' +

// 'arg: ' + binding.arg + '<br/>' +

// 'modifiers: ' + binding.modifiers + '<br/>' +

// 'vnode keys: ' + Object.keys(vnode).join(', ');

// console.log("原来的vnode");

// console.log(vnode);

// },

// update: function(el,binding,vnode){

// el.style.backgroundColor = binding.value;

// console.log("更新的vnode"+vnode);

// console.log("背景色:"+binding.value);

// }

// })

new Vue({

el: ".app",

data: {

colors:[

{color0:'#0000ff'},

{color1:'#00ff00'}

]  

}

})

</script>

</body>

</html>

 

3、使用vue点击li,获取当前点击li父辈元素的属性值

 

<div class="content">

 

<!-- change方法, 数值改变触发 -->

<select v-on:change="getData()" name="" id="dataSelect">

<option value="" v-bind:name="index" v-for="(value, index) in items">{{value.date}}</option>

</select>

 

 

<!-- 为name属性添加当前索引值 -->

<ul v-on:click="toFlow($event)" v-bind:name="i" class="flowData" v-for="(flow, i) in flows">

<li class="li1">

{{flow.name.fullName}}<br>

{{flow.name.time}}

</li>

<li class="li2">

{{flow.val1}}

</li>

<li class="li3">

{{flow.val2}}

</li>

<li class="li4">

{{flow.val3}}

</li>

</ul>

 

</div>

 

 

 

<script>

var vm = new Vue({

el: "#app",

data: {

user: {},

items: [],

flows: []

},

methods: {

// 根据option数值替换数据

getData: function() {

var optionIndex = $('#dataSelect option:selected').attr("name"); //选中的值

vm.flows = vm.items[optionIndex].flowsMonth;

},

toFlow: function(event) {

// 点击li获取当前li父辈ul的name属性值

var flowIndex = event.target.parentNode.getAttribute("name");

var flow = (vm.flows[flowIndex]);

$.ajax({

url: 'php/test.php',

type: 'POST',

dataType: "json",

data: {

flow: flow

},

success: function(data) {

console.log(data);

}

})

}

}

})

 

$(function(){

$.ajax({

url: 'json/items.json',

type: 'GET',

dataType: "json",

success: function(data) {

vm.user =  data.user;

vm.items = data.flows;

// 初始数据

vm.flows = vm.items[0].flowsMonth;

}

})

})

</script>

{

"flows": [

{

"date": "2017年5月",

"flowsMonth": [

{

"name": {

"fullName": "xxx 10G",

"time": "当月有效"

},

"val1": "200",

"val2": "1.3",

"val3": "2300"

},

{

"name": {

"fullName": "xxx 10G",

"time": "当月有效"

},

"val1": "1",

"val2": "2",

"val3": "3"

},

{

"name": {

"fullName": "xxx 10G",

"time": "当月有效"

},

"val1": "1",

"val2": "2",

"val3": "3"

}

]

},

{

"date": "2017年6月",

"flowsMonth": [

{

"name": {

"fullName": "xxx 10G",

"time": "当月有效"

},

"val1": "200",

"val2": "1.3",

"val3": "2300"

},

{

"name": {

"fullName": "xxx 10G",

"time": "当月有效"

},

"val1": "1",

"val2": "22",

"val3": "33"

},

{

"name": {

"fullName": "xxx 10G",

"time": "当月有效"

},

"val1": "12",

"val2": "32",

"val3": "13"

}

]

}

,

{

"date": "2017年8月",

"flowsMonth": [

{

"name": {

"fullName": "xxx 10G",

"time": "当月有效"

},

"val1": "200",

"val2": "1.3",

"val3": "2300"

},

{

"name": {

"fullName": "xxx 10G",

"time": "当月有效"

},

"val1": "61",

"val2": "542",

"val3": "63"

},

{

"name": {

"fullName": "xxx 10G",

"time": "当月有效"

},

"val1": "51",

"val2": "22",

"val3": "34"

}

]

}

]

}

  1. vue怎么点击获取当前元素

vue中有两种方法获取到当前元素

var el = event.target; //当前元素,可修改(能够用此方法获取到他的子元素,不能获取他本身的内容)

var el = event.currentTarget;//当前元素,不可修改(能够用此方法获取到他的子元素及能获取他本身的内容)

 

<div id="example-2"> <!-- `onsomething` 是在下面定义的方法名 --> <button v-on:click='onsomething'>复杂的click<span>哈哈</span></button> </div>

 

var example2 = new Vue({

  el: '#example-2',

  data: {

    name: 'Vue.js'

  },

  // 在 `methods` 对象中定义方法

  methods: {

   onsomething:function(event){ // `event` 是原生 DOM 事件

        alert('hello'  + this.name +'!' ); // `this` 在方法里指向当前 Vue 实例

        var el = event.currentTarget;//复杂的click哈哈

        //var el = event.target;//哈哈

        alert(el.innerText);

    }

  }

})

 

// 也可以用 JavaScript 直接调用方法

//example2.greet() // => 'Hello Vue.js!'

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