<!-- Try the onchange event: -->
<input type="checkbox" id="i1" value="i1" class="filter categories"
v-model="activeCategories" v-on:change="filterMedia()">
<input type="checkbox" id="checkbox" v-model="checked">
<label for="checkbox">{{ checked }}</label><input type="checkbox" id="jack" value="Jack" v-model="checkedNames">
<label for="jack">Jack</label>
<input type="checkbox" id="john" value="John" v-model="checkedNames">
<label for="john">John</label>
<input type="checkbox" id="mike" value="Mike" v-model="checkedNames">
<label for="mike">Mike</label>
<br>
<span>Noms cochés : {{ checkedNames }}</span>