Handle Bootstrap modal hide event in Vue JS

One option is to tie it to a variable:

data: function(){
  return {
       showModal: false
        //starts as false.  Set as true when modal opens. Set as false on close, which triggers the watch function.
},
watch: {
  showModal: function(){
    if(this.showModal == false){
     // do something
  },
}

HTML

<button id="show-modal" @click="showModal = true">Show Modal</button>

 //later if using a component
<modal v-if="showModal" @close="showModal = false">

 // or alternatively in the bootstrap structure
<div class="modal-footer">
     <button type="button" class="btn btn-default" data-dismiss="modal" @click="showModal = false">Close</button>
</div>

Bootstrap uses JQuery to trigger the custom event hidden.bs.modal so it is not easily caught by Vue (which I believe uses native events under the hood).

Since you have to have JQuery on a the page to use Bootstrap's native modal, just use JQuery to catch it. Assuming you add a ref="vuemodal" to your Bootstrap modal you can do something like this.

new Vue({
  el:"#app",
  data:{
  },
  methods:{
    doSomethingOnHidden(){
      //do something
    }
  },
  mounted(){
    $(this.$refs.vuemodal).on("hidden.bs.modal", this.doSomethingOnHidden)
  }
})

Working example.

Please see https://bootstrap-vue.js.org/docs/components/modal#overview There you can find event "hide" or "hidden" So you can bind this event:

<b-modal ref="someModal" @hide="doSometing">