Conditional v-if is working only for the first time? - laravel

Question

I have this in my view:
<div class="already_voted" v-if="already_voted" >
<p>You already voted or your are not allowed to vote</p>
</div>
This is my method :
upvote: function(com_id) {
var comment_id = {
comment_id :com_id
}
this.$http.post('/blog/article/comment/upvote', comment_id).then(function(response){
upvote_total= response.data.upvote_value;
this.already_voted = response.data.already_voted;
this.$dispatch('child-msg', this.already_voted);
$('.upvote_class_' + com_id ).text(upvote_total);
$('.isDisabledUpvote_' + com_id).addClass('disabled');
$('.isDisabledDownvote_' + com_id).removeClass('disabled');
},function(response){
});
},
Im getting value on click and if its true it need to show this div.
Problem is that this div is showed only for first time when already_voted is true and thats it. Next time when its true nothing happend. Any suggestion?

Answer 1

It looks like you are mixing jQuery and Vue, which should be avoided unless you have a specific reason to do so. Instead you should bind attributes to data. As a basic version of what you are doing you could bind both the disabled attribute and the message to a voted flag:
Markup
<div id="app">
<div v-if="voted">
You have already voted!
</div>
<button v-bind:disabled="voted" #click="vote()">
Vote
</button>
<button v-bind:disabled="!voted" #click="removeVote()">
Un-Vote
</button>
</div>
View Model
new Vue({
el: '#app',
methods: {
vote(){
this.voted = true;
},
removeVote(){
this.voted = false;
}
},
data: {
voted: false
}
});
Here I'm simply binding the disabled attribute using v-bind to the voted flag to disabled the buttons and am using v-if to show a message if the voted flag is true.
Here's the JSFiddle: https://jsfiddle.net/05sbjqLL/
Also be aware that this inside an anonymous function refers to the anonymous function itself, so either assign this to something (var self = this) outside the function or use an arrow function if using ES6.
EDIT
I've updated the JSFiddle to show you how you might handle your situation based on you comments:
https://jsfiddle.net/umkvps5g/
Firstly, I've created a directive that will allow you to initiate your variable from your cookie:
Vue.directive('init', {
bind: function(el, binding, vnode) {
vnode.context[binding.arg] = binding.value;
}
})
This can now be used as:
<div v-init:voted="{{ $request->cookie('voted') }}"></div>
I simply disabled the button to show you how to bind attributes to data, there's loads more that can be done, for example showing the message after a user clicks the button, I've just added a click counter and bound thev-if to that instead, so the message doesn't show until a user clicks the button:
<div v-if="vote_attempts">
You have already voted!
</div>
Then in vote() method:
vote() {
this.voted = true;
this.vote_attempts++;
},
Then data:
data: {
voted: false,
vote_attempts: 0
}