I have event duplication after action was moved in store object - vuejs2

Question

In my laravel 5.8 / vue 2.5.17 / vuex^3.1.0 I have a problem that with dialog opened I have event duplication.
I have an event for item deletion :
In my vue file:
...
mounted() {
bus.$on('dialog_confirmed', (paramsArray) => {
if (paramsArray.key == this.deleteFromUserListsKey(paramsArray.user_list_id)) {
this.runDeleteFromUserLists(paramsArray.user_list_id, paramsArray.index);
}
})
bus.$on('onUserListDeleteSuccess', (response) => {
this.is_page_updating = false
this.showPopupMessage("User lists", 'User\'s list was successfully deleted!', 'success');
})
bus.$on('onUserListDeleteFailure', (error) => {
this.$setLaravelValidationErrorsFromResponse(error.message);
this.is_page_updating = false
this.showRunTimeError(error, this);
this.showPopupMessage("User lists", 'Error adding user\'s list !', 'error');
})
}, // mounted() {
methods: {
confirmDeleteUserList(user_list_id, user_list_title, index) {
this.confirmMsg("Do you want to exclude '" + user_list_title + "' user list ?", {
key: this.deleteFromUserListsKey(user_list_id), user_list_id: user_list_id, index: index
}, 'Confirm', bus);
}, //confirmDeleteUserList(id, user_list_title, index) {
deleteFromUserListsKey(user_list_id) {
return 'user_list__remove_' + user_list_id;
},
runDeleteFromUserLists(user_list_id, index) {
this.$store.dispatch('userListDelete', { logged_user_id : this.currentLoggedUser.id, user_list_id : user_list_id } );
}, // runDeleteFromUserLists() {
and in resources/js/store.js :
state : {
...
userLists: [],
...
actions : {
userListDelete(context, paramsArray ) {
axios({
method: ( 'delete' ),
url: this.getters.apiUrl + '/personal/user-lists/' + paramsArray.user_list_id,
}).then((response) => {
let L = this.getters.userLists.length
for (var I = 0; I < L; I++) {
if (response.data.id == this.getters.userLists[I].id) {
this.getters.userLists.splice(this.getters.userLists.indexOf(this.getters.userLists[I]), 1)
context.commit('refreshUserLists', this.getters.userLists);
break;
}
}
bus.$emit( 'onUserListDeleteSuccess', response );
}).catch((error) => {
bus.$emit('onUserListDeleteFailure', error);
});
}, // userListDelete(context, paramsArray ) {
confirmMsg (based on https://github.com/euvl/vue-js-modal )is defined in my mixing :
confirmMsg: function (question, paramsArray, title, bus) {
this.$modal.show('dialog', {
title: title,
text: question,
buttons: [
{
title: 'Yes',
default: true, // Will be triggered by default if 'Enter' pressed.
handler: () => {
bus.$emit('dialog_confirmed', paramsArray);
this.$modal.hide('dialog')
}
},
{
title: '', // Button title
handler: () => {
} // Button click handler
},
{
title: 'Cancel'
}
]
})
},
it worked ok, until I moved userListDelete method from my vue file into store.js.
As a result on 1st event item is deleted ok, the the second item raise error that item was not found and I do not know event is doubled...
How to fix it ?
UPDATED BLOCK :
I still search for valid decision :
I uploaded live demo at :
http://178.128.145.48/login
demo#demo.com wdemo
http://178.128.145.48/websites-blogs will be opened.
Please, try to go to “User's lists” by link at top left menu https://prnt.sc/nq4qiy
and back several times. When on “User's lists” page I try to delete 1 user list it is deleted, but I got several messages
and url in “network” section of my browser : https://imgur.com/a/4ubFB0g
Looks like events are duplicated. And looks like that is move between pages number of guplications is raised.
Why and how to fix it ?
I use #click.prevent in triggering the event to show confirm delete message.
There is “ Add Demo Data” to add more demo rows.
Thanks!

Answer 1

Well, it is quite obvious.
Take a closer look at the Vue component lifecycle diagram.
Your component is mounted each time you enter a route.
So, bus.$on inside your mounted block executed each time you enter this route.
I suggest you move bus event handlers to some other location. For example app.js/ App.vue mounted hook or directly into the store. Since all you do inside handler is calling store actions.