[Vuejs]-Vuejs emit event when datas are rendered

See nextTick. When you set the message data, you need to wait for Vue to update the DOM. That is what nextTick is for. Use it pretty much like you’re using setTimeout

axios
.get('/conversation/'+this.conversation.id+'/message')
.then((response) => {
    this.messages = response.data;
    this.manageHeightChat();
    this.$nextTick(this.scrollToEnd.bind(this));
});