VueJS get variable as text - laravel

Question

I'm working on a Laravel project and i use VueJS for notifications system.
However, i'm a real noob in VueJS dev'. Consequently, i don't know how to print a variable as text.
Situation : System of notifications work and i would like to print the number of notifications in a bootsrap badge. So, i did this :
<i class="fa fa-bell-o" aria-hidden="true"></i> Notifications <span id='badge' class="badge badge-info">{{notifications.length}}</span> <span class="caret"></span>
With this code in my Notification.vue file :
<template>
<li class="nav-item dropdown">
<a id="navbarDropdown" class="nav-link dropdown-toggle" href="#" role="button" data-toggle="dropdown" aria-haspopup="true" aria-expanded="false" v-pre>
<i class="fa fa-bell-o" aria-hidden="true"></i> Notifications <span id='badge' class="badge badge-info">{{notifications.length}}</span> <span class="caret"></span>
</a>
<ul class="dropdown-menu" role="menu">
<li style="text-align:center" v-for="notification in notifications">
<a href="#" v-on:click="MarkAsRead(notification)">
{{notification.data.idea.name}} a été validée !<br>
</a>
</li>
<li style="text-align: center" v-if="notifications.length==0">
Aucune notification !
</li>
</ul>
</li>
</template>
<script>
export default {
props: ['notifications'],
methods: {
MarkAsRead: function (notification) {
var data = {
id: notification.id
};
axios.post('/notification/read', data).then(response => {
window.location.href = "/manif/";
});
}
}
}
</script>
Finally i only see {{notifications.length}} write in the badge instead of a number...
Can you help me about this ?
Thank's

Answer 1

The raw mustache tags are shown because you've used v-pre directive in the parent element, which tells Vue to not compile the element and its children:
<a id="navbarDropdown" ... v-pre> <!-- Don't use v-pre here -->
...
<span ...>{{notifications.length}}</span>
</a>
Simply removing that directive should resolve the issue: demo