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Detailed examples of how to create and use vue custom filters

小云云Original: 2018-05-18 16:23:182804browse

This article mainly introduces the creation and use of vue custom filters in detail. It has certain reference value. Interested friends can refer to it. I hope it can help everyone.

Filter: There are many examples in life, water purifier and air purifier.

The role of the filter: to filter, filter and format data.

vue1.* version has built-in filters, but in vue2.* all versions no longer have built-in filters.

1. Filter creation

The essence of filter is a method with parameters and return value

　　new Vue({
　　　　filters:{
　　　　　　myCurrency:function(myInput){
　　　　　　　　return 处理后的数据
　　　　　　}
　　　　}
　　})

2. Filter usage

Syntax:
　2cfd83bcbfaff9bacc12c0937fd77054{{Expression|Filter}}fe444642c29a30e898f3de4e0f1d7b5b

For example Example:
　4a249f0d628e2318394fd9b75b4636b1{{price | myCurrency}}473f0a7621bec819994bb5020d29372a

3. Advanced usage of filters

When using filters You can also specify parameters to tell the filter to filter data according to the parameters.

①How to pass parameters to the filter?

4a249f0d628e2318394fd9b75b4636b1{{price | myCurrency('￥',true)}}473f0a7621bec819994bb5020d29372a

②How to filter received?

new Vue({
　　filters:{
　　　　//myInput是通过管道传来的数据
　　　　//arg1在调用过滤器时在圆括号中第一个参数
　　　　//arg2在调用过滤器时在圆括号中第二个参数
　　　　myCurrency:function(myInput,arg1,arg2){
　　　　　　return 处理后的数据
　　　　}

　　}

})

Code:

<!DOCTYPE html>
<html>
<head lang="en">
 <meta charset="UTF-8">
 <script src="js/vue.js"></script>
 <title></title>
</head>
<body>

<p id="container">
 <p>{{msg}}</p>
 <h1>{{price}}</h1>
 <h1>{{price | myCurrency(&#39;￥&#39;)}}</h1>
</p>

<script>
 // filter
 new Vue({
  el: &#39;#container&#39;,
  data: {
   msg: &#39;Hello Vue&#39;,
   price:356
  },
  //过滤器的本质 就是一个有参数有返回值的方法
  filters:{
   myCurrency:function(myInput,arg1){
    console.log(arg1);
    //根据业务需要，对传来的数据进行处理
    // 并返回处理后的结果
    var result = arg1+myInput;
    return result;
   }
  }
 })
</script>

</body>
</html>

<!DOCTYPE html>
<html>
<head lang="en">
 <meta charset="UTF-8">
 <script src="js/vue.js"></script>
 <title></title>
</head>
<body>

<p id="container">
 <p>{{msg}}</p>
 <h1>{{name | myTextTransform(false)}}</h1>
</p>

<script>
 new Vue({
  el: &#39;#container&#39;,
  data: {
   msg: &#39;Hello Vue&#39;,
   name:&#39;Michael&#39;
  },
  filters:{
   myTextTransform: function (myInput,isUpper) {
    if(isUpper)
    {
     return myInput.toUpperCase();
    }
    else{
     return myInput.toLowerCase();
    }
   }
  }
 })
</script>

</body>
</html>

<!doctype html>
<html>
 <head>
 <meta charset="UTF-8">
 <title>过滤器</title>
 <script src="js/vue.js"></script>
 </head>
 <body>
 <p id="container">
  <p>{{msg}}</p>
  <h1>{{price}}</h1>
  <h1>{{price|myCurrency}}</h1>
 </p>
 <script>
  new Vue({
   el:"#container",
   data:{
    msg:"Hello VueJs",
    price:356
   },
//过滤器的本质 就是一个有参数有返回值的方法
   filters:{
    myCurrency:function(myInput){
     var result = "$"+myInput;
     return result;
    }
   }
  })
 </script>
 </body>
</html>

The last example is hard-coded.

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