vuejs inline editing with select box option call issues - vue.js

Question

Good Day, I'm working on a simple inline editing functionality with Vuejs. Please have a look at this jsbin.
Users info. listed with Edit buttons, when clicked i turn those into input/select fields and populate corresponding options with helper methods.
My issue here is once i populate select options, my helper methods being called even if i change select value. How can i change this to load them only once and use them. Also, how can i validate current row fields as required when clicked on save button?

Answer 1

Try this.
new Vue({
el: '#app',
data: {
users: [
{name: 'Jhon', city:'Newyork', country: 'US', country_id:'23', city_id:'4'},
{name: 'Ali', city:'London', country: 'UK', country_id:'13', city_id:'33'},
{name: 'Raj', city:'Delhi', country: 'IN', country_id:'3', city_id:'11'},
],
cities: [
{id:'4', val:'Newyork', country_id:'23'},
{id:'33', val:'London', country_id:'13'},
{id:'11', val:'Delhi', country_id:'3'},
],
countries: [
{id:'23', val:'US'},
{id:'13', val:'UK'},
{id:'3', val:'IN'},
]
},
computed:{
citiesByCountry(){
return this.countries.reduce((acc, country) => {
acc[country.id] = this.cities.filter(c => c.country_id == country.id)
return acc
}, {})
}
},
methods: {
edit :function(obj){
this.$set(obj, 'editmode', true);
},
save : function(obj){
this.$set(obj, 'editmode', false);
},
cloneLast:function(){
var lastObj = this.users[this.users.length-1];
lastObj = JSON.parse(JSON.stringify(lastObj));
lastObj.editmode = true;
this.users.push(lastObj);
},
}
})
And change your template to this.
<td>
<span v-if="user.editmode">
<select v-model="user.city_id" required>
<option v-for="option in citiesByCountry[user.country_id]" :value="option.id">{{option.val}}</option>
</select>
</span>
<span v-else>{{user.city}}</span>
</td>
<td>
<span v-if="user.editmode">
<select v-model="user.country_id" required>
<option v-for="option in countries" :value="option.id">{{option.val}}</option>
</select>
</span>
<span v-else>{{user.country}}</span>
</td>
Working example.