Tips on utilizing setInterval in a Vue component

When defining the timer in each individual my-progress, I use it to update the value of view. However, the console shows that the value of the constant changes while the value of the view remains unchanged. How can I modify the timer to successfully change the value of view?

Vue.component('my-progress', {
    template: '\
            <div class="progress progress-bar-vertical" data-toggle="tooltip" data-placement="top">\
                <div class="progress-bar" role="progressbar" aria-valuenow="0" aria-valuemin="0" aria-valuemax="100" :style="{height: pgvalue}">{{pgvalue}}\
                </div>\
            </div>\
        ',
    data : function(){  

        return {
            pgvalue : '50%',
            intervalid1:'',
        }
    },
    computed:{

        changes : {
            get : function(){
                return this.pgvalue;
            },
            set : function(v){
                this.pgvalue =  v;
            }
        }
    },
    mounted : function(){

        this.todo()     
    },
    beforeDestroy () {

       clearInterval(this.intervalid1)
    },
    methods : {

        todo : function(){          
            this.intervalid1 = setInterval(function(){
                this.changes = ((Math.random() * 100).toFixed(2))+'%';
                console.log (this.changes);
            }, 3000);
        }
    },
})

For additional reference, please visit: jsbin.com/safolom

javascriptvuejs2vue-component

Answer №1

this isn't referencing the Vue object. Give this a try:

todo: function(){           
    this.intervalid1 = setInterval(function(){
        this.changes = ((Math.random() * 100).toFixed(2))+'%';
        console.log (this.changes);
    }.bind(this), 3000);
}

or 

todo: function(){  
    const self = this;          
    this.intervalid1 = setInterval(function(){
        self.changes = ((Math.random() * 100).toFixed(2))+'%';
        console.log (this.changes);
    }, 3000);
}

or

todo: function(){  
    this.intervalid1 = setInterval(() => {
        this.changes = ((Math.random() * 100).toFixed(2))+'%';
        console.log (this.changes);
    }, 3000);
}

Check out How to access the correct this inside a callback?

Answer №2

take a look at this demo:

Vue.component('my-progress-bar',{
template:
`<div class="progress">
<div
class="progress-bar"
role="progressbar"
:style="'width: ' + percent+'%;'"
:aria-valuenow="percent"
aria-valuemin="0"
aria-valuemax="100">
{{ percent }}%
</div>
</div>`,
props: { percent: {default: 0} }
});


new Vue({
el: '#app',
data: {p: 50},
created: function() {
var self = this;
setInterval(function() {
        if (self.p<100) {
             self.p++;
         }
    }, 100);
}
});
<script src="https://cdn.jsdelivr.net/npm/vue"></script>
<link href="https://stackpath.bootstrapcdn.com/bootstrap/4.3.1/css/bootstrap.min.css" rel="stylesheet>

<div id='app'>
  <my-progress-bar :percent.sync='p'>
  </my-progress-bar>
  <hr>
  <button @click='p=0' class='btn btn-danger bt-lg btn-block'>
  Reset Bar Progress
  </button>
</div>

Answer №3

created : {

  window.setInterval(() => {
    getList(); // initiate any function or endpoint
  }, 1000); // set interval to one second

}


const getList = () => {
    console.log('bar')
};
<script src="https://cdnjs.cloudflare.com/ajax/libs/vue/2.5.17/vue.js"></script>

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