I have a performance problem with datalist in vue.js with Google Chrome (latest version : 83.0.4103.97). I have to say i started to learn Vue.js few month ago so i m still a noob. With Firefox everything is ok, the datalist and filtering works instantly. With Chrome everything is slow... I type in the input field, the letters appear very slowly (or all at once) and i have to wait a lot of seconds for the filter applies. After this i have to click multiple times on the element to fill the field. Here are videos of both browsers behavior and parts of my code.
Firefox : https://streamable.com/vj4rbb
Chrome : https://streamable.com/2sikq5
Component code :
<b-input-group size="sm" v-if="menuEditState">
<b-form-input
:list="`mealDish${meal.id}`"
:id="`input${meal.id}`"
placeholder="Selectionner un plat"
v-model="name"
:class="{'is-invalid': $v.name.$anyError}"
/>
<datalist :id="`mealDish${meal.id}`">
<option v-for="dish in activeDishesByType" :value="`${dish.name} (${dish.humanType})`" :data-value="dish.id"></option>
</datalist>
<b-input-group-append>
<b-button variant="primary" @click="onClick" :disabled="loading">
<i :class="loading ? 'fa fa-spin fa-circle-notch' : 'fa fa-plus'" />
</b-button>
</b-input-group-append>
</b-input-group>
And script
computed: {
...mapGetters({
activeDishesByType: 'activeDishesByType',
}),
The getter is based on a Vuex state sort in a getter (I have the same behavior if i use the state without the getter sorting).
I know there is a performance monitor in chrome dev tools and i try to find something which could help me fixing this but i dont know where to search in all theses informations.
Thanks for your help.
Romain.
Ok so i finally find what element was causing so much performances issues in Chrome. Its the value in the datalist options... So i managed to use only data-* and text in the datalist. Please dont hesitate to improve this or add comments.
No more "value" on the data-list :
<b-input-group size="sm">
<b-form-input
:list="`mealDish${meal.id}`"
:id="`input${meal.id}`"
placeholder="Selectionner un plat"
v-model="name"
/>
<datalist :id="`mealDish${meal.id}`">
<option v-for="dish in activeDishesByType" :data-value="dish.id">{{
`${dish.name} (${dish.humanType})`
}}</option>
</datalist>
<b-input-group-append>
<b-button variant="primary" @click="onClick" :disabled="loading">
<i :class="loading ? 'fa fa-spin fa-circle-notch' : 'fa fa-plus'" />
</b-button>
</b-input-group-append>
</b-input-group>
And the search in the datalist options for bringing back my data-value :
// Get the selected/typed value
const shownVal = document.getElementById(`input${this.meal.id}`).value;
const datalist = document.querySelector(`#mealDish${this.meal.id}`);
// Find the option in the list and get the data-value (id)
let dishId = null;
for (var i = 0; i < datalist.options.length; i++) {
if (datalist.options[i].text === shownVal) {
dishId = datalist.options[i].dataset.value;
break;
}
}