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[Vue.js] change class dinamically to the pass of a videotime

i need to change the class of some span to the pass of the time of a video. i create the span tags from an array with the v-for, inside the array there is the start time and stop time of the text, so to change the class of the single text checking the interval and the actual video time. i tried this code:


<span :class=”{‘selected’:(}” v-for=”item in Array”>

Array: [{
id: 0,
start_time: 0,
end_time: 1,
text: “Hello”
}, {
id: 1,
start_time: 1,
end_time: 2,
text: “guys.”
}, {
id: 2,
start_time: 2,
end_time: 3,
text: “In this lesson”
}, …]

setInterval(myTimer, 500);

function myTimer() {
for (let i in array) {
if (Math.round(_myplayer.currentTime()) != 0) {
if (array[i].start_time < Math.round(_myplayer.currentTime()) && Math.round(_myplayer.currentTime()) <= array[i].end_time) {

these are the main pieces of my code, the main problem is to link the currentIndex to the id of the span. it’s a kind of ted transcript text highlight
sorry for my english, thank you

Solution :

Try to put set interval into ‘created’ life cycle hook like :

created: function () {
setInterval(myTimer, 500);

Or better use v-model to watch the id