Guide for displaying d3.js chart using a vue.js method and specifying the target div

I'm working on my Vue code and here's a snippet of what I have:

new Vue({

    el : '#friendlist',

    data : {

        friends : []

    },

    methods : {

        fetchStats : function(){

            const axios_data = {
                _token  : $('meta[name="csrf-token"]').attr('content')
            };

            axios.post('/friend-stats/all', axios_data).then(response => {

                this.friends = response.data;

            });

        }
    },

    mounted : function(){

        this.fetchStats();

    },

Now, I need to render a d3.js chart for each friend in the friends array. I have a separate JS method called

create_spider_chart(friend, target)
that works fine. The issue arises when trying to attach the charts to specific elements.

If I try to do it like this after the axios call:

this.friends = response.data.data;
let target;
for(let i=0;i<this.friends.length;i++){
     target = '.spider-graphic-mini[data-id="'+this.friends[i].id+'"]';
     create_spider_chart(this.friends[i], target);   //d3.js
}

The element

.spider-graphic-mini[data-id="'+this.friends[i].id+'"]
is indeed present in the HTML:

<template v-for="(friend,key) in friends">
     <div class="col-md-6 friend-panel p-3">
          <h5>@{{ friend.name }}</h5>
          <div class="spider-graphic-mini mb-4" :data-id="friend.id"></div>
     </div>
</template>

However, despite the element being there, when passing its identifier to the create_spider_chart function, it doesn't seem to recognize it. Consequently, $(target) returns length=0, causing the chart creation to fail.

What would be the best approach to tackle this problem?

Answer №1

Haven't had the chance to work with d3 before, so keep that in mind.

JavaScript operates on a single thread and Vue's DOM updating process is asynchronous. When you add content to your friends array, Vue may not have rendered your template with the new data yet. This could be why your element doesn't seem to exist at first.

To address this issue, try using $nextTick(callback) to wait for Vue to re-render your template before running any code dependent on the presence of elements within the callback function.

Take a look at this documentation for more information...

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