Vue

by Md. Atiquzzaman Soikat

HTML

<div id="app">
  
<button @click.prevent="removeListener">remove listener</button>
<button @click.prevent="changePage">change page</button>
</div>

CSS

body {
  background: #20262E;
  padding: 20px;
  font-family: Helvetica;
}

#app {
  background: #fff;
  border-radius: 4px;
  padding: 20px;
  transition: all 0.2s;
}

li {
  margin: 8px 0;
}

h2 {
  font-weight: bold;
  margin-bottom: 15px;
}

del {
  color: rgba(0, 0, 0, 0.3);
}

Vue

new Vue({
  el: "#app",
  data: function(){
  	return {
    	beforeunload : null
    }
  },
  created: function(){
  	this.beforeunload = window.addEventListener('beforeunload', ()=>{
    this.redirect();
    });
  },
  methods: {
  	toggle: function(todo){
    	todo.done = !todo.done
    },
    redirect: function(){
    	console.log('warning');
    	//alert('fake redirect');
    },
    removeEventListener: function(){
    	window.removeEventListener('beforeunload');
    },
    changePage: function(){
    	alert("hello world");
    	//window.location = "https://www.mozilla.org";
    }
  }
})