Checkbox click invalid data inside v-for loop

Question

I would like to validate at least one need to check the checkbox. I'm trying to validate when I clicked on checkbox through the loop. When I checked one, the output is invalid return false in the first click. When I unchecked return true. But when I checked my sizes array data with vue-dev tools data is valid. I'm trying to find that bugs but I didn't find. I don't know why.I would like to know that's why? Am I wrong?

new Vue({
  el: '#app',
  data: {
   		sizes:[
      	{id:1,name:'small',ischeck:false,price:0},
        {id:2,name:'medium',ischeck:false,price:0},
        {id:3,name:'large',ischeck:false,price:0}        
      ],
      newval:[]
  },
  methods: {
    checkchanged(){
    	for(var i=0;i<this.sizes.length;i++){           
      	console.log(this.sizes[i].ischeck);
      }     
      
    }
  }
})

<script src="https://unpkg.com/[email protected]/dist/vue.js"></script>

<div id="app">
<span v-for="size in sizes">
  <input type="checkbox" v-model="size.ischeck" :value="size.ischeck" 
    @click="checkchanged">
    <label>{{size.name}}</label>
    <input type="text" :disabled="!size.ischeck" v-model="size.price">
</span>

</div>

Boussadjra Brahim · Accepted Answer · 2018-09-07 01:57:59Z

You could do that using computed property which you call error and hide/show the error message according to that property value:

new Vue({
  el: '#app',
  data: {
   		sizes:[
      	{id:1,name:'small',ischeck:false,price:0},
        {id:2,name:'medium',ischeck:false,price:0},
        {id:3,name:'large',ischeck:false,price:0}        
      ],
      newval:[],
      
  },
  methods: {
    checkchanged(){
    	for(var i=0;i<this.sizes.length;i++){           
      	console.log(this.sizes[i].ischeck);
      }  
      
    }
  },
  computed:{
    error(){
      for(var i=0;i<this.sizes.length;i++){ 
      if(this.sizes[i].ischeck) return false;
    }
    return true;
    }
  }
})

<script src="https://unpkg.com/[email protected]/dist/vue.js"></script>


<div id="app"  style="display :flex;flex-direction: column;">
<div v-for="size in sizes">
  <input type="checkbox" v-model="size.ischeck" :value="size.ischeck" 
    @change="checkchanged">
    <label>{{size.name}}</label>
    <input type="text" :disabled="!size.ischeck" v-model="size.price">
    
</div>
   <div v-if="error"  style="color:red">
     there's an error !
   </div>
</div>

Finally you don't need to that event @click="checkchanged" you can use @change="checkchanged" instead

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