How to implement two-way binding in js-JS Tutorial-php.cn

How to implement two-way binding in js

亚连

Release： 2018-06-14 10:36:39

Original

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Below I will share with you an explanation of the simplest two-way binding example in js. It has a good reference value and I hope it will be helpful to everyone.

Copy the code and put it into the page to run and see the effect

<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="UTF-8">
  <title>Title</title>
</head>
<body>
<input type="text" id="myinput" >
<script>
  function watch(obj,key,callback) {
    var old = obj[key];
    Object.defineProperty(obj,key,{
      set:function(val){
        var oldVal = old;
        old = val;
        callback(val,oldVal,this);
      },
      get:function(){
        return old;
      }
    });
  }
  var input = document.getElementById("myinput");
  var obj = {};
  watch(obj, "input",function (val) {
    input.value = val;
    console.log("这里是不管view层，还是module层修改后的回调，最后设置的值是"+val);
  });
  input.onkeyup = function () {
    obj.input = input.value;
  };
</script>
</body>
</html>

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Code test

If you modify the value in the input, you will see the new value printed out on the console

Modify the value of obj.input on the console, the value in the input box will also change accordingly, and the event will also be triggered. , Get new value

The above is what I compiled for everyone. I hope it will be helpful to everyone in the future.

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